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National Mower 68 DL Lawn Mower User Manual

1. SAFETY SWITCH TERMINALS 407 terminals B amp C connect to normally closed contacts terminals D amp E connect to normally open contacts MODEL 68 SR ELECTRICAL SAFETY SWITCH AND CIRCUIT DIAGRAM F MAIN CLUTCH SWITCH neutral position shown WING PTO CLUTCH SWITCH neutral position shown operator on seat condition shown F SEAT SWITCH WING LIFT SWITCH down position shown normally open portion of d Joc E switches not shown gn 403 402 101 12 VOLT BATTERY at Fn ee fe ee at hee 3 AMMETER KS STARTER SOLENOID es 103 102 MOTOR tl 201 77 BLK WHT on 1 I Back of IGN Switch i i YEL GRN pe IGN FLYWHEEL YEL SWITCH 407 BLK ALTERNATOR MAGNETO YEL 1 OFF M A G RUN B L A 30 AMP VOLTAGE START B L S 301 392 REGULATOR 901 69 BLK HOUR BRIGGS 7 5 HP VANGUARD METER 202 402 12 starter 10 amp alternator d x 403 or tre ve eque MAIN CLUTCH SWITCH B ye el neutral position shown 701 601 et PIE mr crm D jne 1 WING PTO CLUTCH SWITCH SAFETY SWITCH TERMINALS Kl Sci ere a I neutral position shown terminals B amp C connect to KA normally closed contacts 502 terminals D amp E connect to 8
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4. NATIONALE MODEL 68 SR TRIPLEX MOWER CE MODEL 68 DL TRIPLEX MOWER OWNER S MANUAL Includes Operation Maintenance and Parts List NATIONAL MOWER CO 700 Raymond Ave P O Box 14299 St Paul Minnesota 55114 0299 U S A Phone 651 646 4079 Fax 651 646 2887 www nationalmower com June 2003 NATIONAL MOWER COMPANY ONE YEAR LIMITED WARRANTY For the period of one year from the date of purchase 45 days if the product is used for rental purposes National Mower Company will repair or replace free of charge for the original purchaser any part or parts found by inspection to be defective by our Factory Authorized Service Station or by the Factory at St Paul Minnesota to be defective in material or workmanship or both All transportation charges on parts submitted for repair or replacement under this warranty shall be paid for by the purchaser This warranty does not include engines engine parts or tires which are covered under separate warranties furnished by their manufacturer or supplier All service under this warranty will be furnished and performed by our Factory Authorized Service Stations THERE IS NO OTHER WARRANTY EXPRESSED OR IMPLIED Warranties including those of merchantability and fitness for a particular purpose are limited to one year from purchase or 45 days if the product is rented and to the extent permitted by law any and all implied warranties are excluded The above remedy of repair and replacem
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6. Thoroughly inspect the area where the equipment is to be used and remove all objects which can be thrown by the machine Replace faulty silencers Before using always visually inspect to see that the reels bed knives and cutting unit assemblies are not worn or damaged Replace worn or damaged reels and bedknives in sets to preserve balance On multi reel machines take care as rotating one reel can cause other reels to rotate SAFETY INFORMATION 3 OPERATION Do not operate the engine in a confined space where dangerous carbon monoxide fumes can collect Mow only in daylight or good artificial light Before attempting to start the engine disengage all cutting unit clutches and shift into neutral Do not use on slopes of more than 15 Remember there is no such thing as a safe slope Travel on grass slopes requires particular care To guard against overturning do not stop or start suddenly when going up or downhill engage clutch slowly always keep machine in gear es pecially when travelling downhill machine speeds should be kept low on slopes and dur ing tight turns stay alert for humps and hollows and other hidden haz ards never mow across the face of the slope unless the ma chine is designed for this purpose Watch out for traffic when crossing or near roadways Stop the reel rotation before crossing surfaces other than grass Never direct discharge of material toward bystanders
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8. 9 204495 ADJUSTER Roller not included 680M 06 03 45 DIAL A HEIGHT ROLLER SCRAPER P N 860033 includes items 1 4 Item Part No Description Qty per Kit 1 205384 BRACKET Cable Mounting L H 3 2 04107 U BOLT 1 4 20 x 1 25 ID x 2 25 6 3 09092 CABLE Roller Scraper Wing Cutting Unit 2 09090 CABLE Roller Scraper Rear Cutting Unit 1 4 205385 BRACKET Cable Mounting R H 3 46 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX DIAL A HEIGHT ROLLER ADJUSTER KIT P N 860034 Item Part No Description Qty per Kit 1 205341 DECAL Instruction 6 2 205348 ASSEMBLY Roller Adjuster L H 3 3 205380 WELDMENT Roller Bracket L H 3 4 204991 PLATE Scale 6 5 205346 DECAL Wing Cutting Unit 4 205339 DECAL Rear Cutting Unit 2 6 205381 WELDMENT Roller Bracket R H 3 7 205349 ASSEMBLY Roller Adjuster L H 3 680M 06 03 47 DIAL A HEIGHT ADJUSTER 205348 4 205349 Item Part No Description Qty 1 204996 CAP Vinyl 1 2 205334 WELDMENT Threaded Rod 1 3 204995 SPRING 1 4 205345 WELDMENT Socket 1 5 205399 WELDMENT Height of Cut Adjuster R H 1 205400 WELDMENT Height of Cut Adjuster L H 1 6 204997 END Swivel 1 48 680M 06 03 SAFETY SWITCHES DANGER Never attempt to remove or circumvent the safety switches Dangerous operating conditions may result Your National 68 mower is equipped with safety switches to monitor the operating conditions of ce
9. FOOT REST Right Hand 1 20 07560 SWITCH Interlock 1 21 09217 GUARD Main Belt 1 22 200200 STEERING WHEEL 1 23 200199 COLLAR Steering Shaft 1 24 200203 BRACKET Throttle Control 1 25 07034 SWITCH Key Briggs amp Stratton and Kawasaki 1 26 07032 THROTTLE CONTROL Includes conduit and wiring 1 27 07036 SEAT 1 28 200867 BALL JOINT 2 680M 06 03 29 RUNNING GEAR amp MISC PARTS MODEL 68 DL 30 Item Part No Description Qty 1 07065 KEY SWITCH 1 2 07064 AMPMETER 1 3 07063 HOURMETER 1 4 09098 DASHBOARD 1 5 09218 GUARD Main Belt 1 6 200200 STEERING WHEEL 1 7 09101 COVER Battery 1 8 201754 HOLDOWN Battery 1 9 201582 BATTERY BOX 1 10 202447 ROD Side Post Battery 2 11 201925 FOOT REST Left 1 12 07038 TIRE Deluxe Wide 2 13 07560 INTERLOCK 1 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX SEAT MOUNTING amp BELT GUARDS Item Part No Description Qty 1 07101 ADJUSTER Seat 1 2 200814 HINGE Seat 2 3 205470 BRACKET Seat Switch 1 4 02614 WASHER 2 5 04512 SPRING Seat 2 6 202249 TUBE Pivot 1 7 202251 HANDLE Lifter 1 8 07039 GRIP Handle 1 9 09218 GUARD Main Belt DL only 1 09217 GUARD Main Belt SR only 1 10 09213 SHIELD Latch Hook L H 1 11 09216 GUARD Pulley DL only 1 12 09100 GUARD Engine Clutch DL only 1 09002 GUARD Engine Clutch SR only 1 13 205485 GUARD Pulley 1 14 09220 SHIELD Latch Hook R H 1 15 202343 ASSEMBLY Seat Bracket 1 16 07325 SWITCH 1 1
10. an electrical interlock and engine will not start if clutch is engaged For added safety the interlock system should be checked periodically to ensure that it is adjusted to function properly B Engine Throttle Lever Regulates mowing and travel speeds Moving the control handle back will reduce engine speed for starting and idling engine Push forward to increase engine speed Never travel at speeds faster than required for proper mowing C Wing Cutting Unit Clutch Lever Engages drive to Wing Cutting Units Pull lever back and down to engage Never engage drive unless Wing Cutting Units have been lowered to cutting position Engine Choke Lever No photo Located near the upper rear right corner of the engine Use the choke when starting a cold engine See the engine manual for engine starting information and proper use of the choke 680M 06 03 OPERATION D Transport Clutch Model 68 DL only WARNING NEVER USE THE TRANSPORT CLUTCH WHILE THE CUTTING UNITS ARE TURNING OR WHEN THE DIFFERENTIAL SHIFT IS IN REVERSE Use this clutch to travel between mowing sites at speeds faster than those obtained with the main clutch Before using disengage the cutting unit clutches and raise the cutting units to their transport position Operate the transport clutch by slowly pressing the pedal with your left foot Releasing the pedal will cause the mower to coast to a stop or resume mowing speed E Wing Cutti
11. following photos to locate the Not use oil in the differential case lubrication points on the mower in place of grease it will leak through the seals DIFFERENTIAL ENGINE Since the mower does not operate at high speeds the grease level in the differential is not critical providing that Refer to the engine manual separately furnished for there is sufficient grease to coat the gears Unless proper lubrication and maintenance instructions ERIC NATIONAL 68 SR amp DL TRIPLEX LUBRICATION POINTS 1 Front wheel bearing 2 Steering Kingpin 10 Lower countershaft 4 Steering column 2 places 5 Brake pedal pivot 6 Idler pivot bracket 68 DL only 7 Main clutch handle 11 Wing mower pull rod 2 places 8 Wing mower clutch handle 19 680M 06 03 MAINTENANCE LUBRICATION POINTS 18 Rear mower pivot tube 12 Rear axle 2 places 13 Differential input tube 14 Brake drum tube 15 Main axle tube 19 Rear mower countershaft 2 places 20 Rear mower clutch 21 Wing mower lift arm 2 places all 17 Rear mower lift arm pivot 20 680M 06 03 LUBRICATION POINTS 22 Cutting reel bearing 6 places 23 Height of cut adjuster 6 places Dial A Height adjusters optional 24 Threaded shaft 6 places 25 Swivel block 6 places DC GE Belt clutch arm pivot arms 68 DL only 26 Belt clutch idler arm 27 Transport clutch foot pedal 68
12. or allow anyone near the machine while in operation Never operate the lawnmower with defective guards or without safety devices in place Do not change the engine governor setting or overspeed the engine Operating the engine at excessive speed can increase the hazard of personal injury Before leaving the operator s position disengage the power take off and lower the cutting units shift into neutral and set the parking brake stop the engine and remove the key Disengage drive to the cutting units stop the engine remove the ignition key and disconnect the spark plug wire before cleaning blockages or unclogging chute before checking cleaning or working on the machine after striking a foreign object Inspect the lawn mower for damage and make repairs before restarting and op eration the lawn mower if lawn mower starts to vibrate abnormally check imme diately Disengage drive to attachments when transporting or not in use Stop the engine and disengage drive to attachment before refuelling before removing the grass catcher before making height adjustment before cleaning blockages before checking cleaning or working on the mower after striking a foreign object Inspect the mower for damage and make repairs before restarting and oper ating the equipment Reduce the throttle setting during engine shutdown and turn the fuel off at the conclusion of mowing 4 MAIN
13. 01 501 tacts normally open contacts SEAT SWITCH EE Caen GE WING LIFT SWITCH n n 1 1 down position shown operator on seat 1 1 I 1 normally open portion of condition shown 955 1 Sasa HAN 1 switches not shown 904 903 906 905 MODEL 68 DL ELECTRICAL SAFETY SWITCH AND CIRCUIT DIAGRAM 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX ELECTRICAL PARTS MODELS 68SR amp 68 DL Part No Model68SR Model 68 DL Deserpion Gly 07034 07065 KEY SWITCH 1 07063 HOURMETER 1 07064 AMPMETER 1 BATTERY Exide GT H or equiv 12V U1 235 CCA 1 07104 GROUND WIRE Battery 1 07570 07580 HARNESS ASSEMBLY 1 07325 07325 SWITCH Safety 5 07560 INTERLOCK MODULE 1 Note Your mower may be equipped with a digital hour meter This meter will display a signal after 5 hours and every 25 hours thereafter recommending that you change the engine oil and lubricate the mower 680M 06 03 51 SPECIFICATIONS MOWER DIMENSIONS amp WEIGHT Ov rall E ngthi air eit Urs t ede ed Hu eee ddp 79 13 201 cm Width Wing Mowers Folded emen 61 8 157 cm Width Wing Mowers DOWN ennemis 76 193 cm epu c Ic 39 37 100 Weight empty iu rotta Ere e su onte Paar rece ERR nta 659 Ibs 299 kg ENGINE BRIGGS amp STRATTON 138400 SERIES Engine Forced Ai
14. 02 L Jop A2TIOd 40920 8 L J8MO N 1294 LINN WHY 611002 47 L ONIUdS 706470 ov L HH H3TIOH 2L1 0c 90A ONIHSNA 661002 vv L Aen yeysisjunod ONIHSNG 40090 Ev L HEYSJ8JUNOO ATEWNISSV AFTINd 792003 Ch L Jemoy Jeay mer HOLNTO 992002 52 ONIHdS 90540 OV L OTI avo LSNA 20920 6 L 4IIN O 5 dIYHD 09040 86 L Jeyius yN 43437 922002 LE L ONIHdS 0 9 L 49497 YDINID 1 6272002 96 uoini Nid 090 ve L 9N1 93141 5 835003 66 L 49MO N 17139 40660 GE L 34OA YIL4HIHS 22002 LE L yeas JOvYE 106202 06 L pieno 9 712002 6c L 331 431411 cSveOc 8c L 1294 NIVHO 18740 20 L J8MO A Je9Y 3IAVHJ 6 00 9c L 497 ATEWASSV H3lHHVO 1334 066206 9 MO uonduoseq ON Hed LINN 9NLLLOO HV3H 2 ONIddS 67270 vc 02 JANA 407102 JSMON ATENISSV INVYH 3HINM 6 1105 22 MAIS GU peg LAN 208102 mojeq INU UM es e Se pios 6 9JIUM peg MIYOS 60120 L 2 12190 2 02190 0c L epelg 9 YSMoN ATENISSV 1334 2002 61 leeu 199004dS 41120 81 48 L L X 91 9 QNH 1920105 Nid 80070 Zt 340O0HdS 91120 94 18MO N eeu YEUSIE1UNOQ ONISNOH 192002 GI 2 dn 3xv L Lev L
15. 03622 SHIELD Engine 1 2 07023 GRIP Lever 96 and up 1 3 205486 LEVER Lower Countershaft Control 1 4 07325 SWITCH Control 2 5 02288 U NUT 1 4 20 2 6 205471 BRACKET Muffler Guard L H 1 7 205472 BRACKET Muffler Guard R H 1 8 205477 GUARD Muffler 1 9 200172 ROD Countershaft Idler Control shown for reference only 1 10 202437 SPRING 2 11 200182 COLLAR Lock 2 12 200170 ROD 1 13 04552 SPRING Lift Latch 2 14 200676 BUSHING 4 15 205451 HOOK Wing Mower 2 16 04056 ROLL PIN 0 25 x 1 12 2 34 680M 06 03 DRIVE MECHANISM LOWER PORTION NATIONAL 68 SR amp DL TRIPLEX Item Part No Description Qty 1 03615 PULLEY Lower Countershaft 2 2 06105 BEARING Lower Countershaft 2 3 205482 CARRIER Lower Countershaft Model 68SR only 1 205481 CARRIER Lower Countershaft Model 68DL only 1 4 04056 ROLL PIN 0 25 x 1 12 2 5 02614 WASHER 1 6 205458 PIVOT Switch R H 1 7 200123 BUSHING 1 8 02614 WASHER 1 9 202798 SPRING 2 10 200137 PULL ANGLE Wing Mower Rear 1 11 205461 PIVOT Switch L H 1 12 02602 DUST CAP 3 4 1 0 2 13 205454 PULL ARM Wing Mower Left and Right Hand 1 14 07226 GRIP Wing Mower Arm 1 15 200135 COUNTERSHAFT Lower 1 16 03901 BELT Countershaft A29 1 17 03603 PULLEY Lower Countershaft Drive 1 18 200136 BELT GUIDE Pulley 1 19 205462 BRACKET Switch Mounting 2 20 07325 SWITCH Control 2 21 04505 SPRING Wing Mower Pull Rod 1 22 200151 PULL ROD Wing Mower 1 23 201880 PIN Wing
16. 0M 06 03 NATIONAL 68 SR amp DL TRIPLEX 21 DANGER To assure safety disengage the engine clutch lever remove the ignition key and disconnect the engine spark plug wire prior to making any of the following adjustments DANGER Handle reel assemblies carefully with protective gloves Reels are very sharp Reels rotate freely and rotating one reel can cause other reels to rotate Special care should be takeninthe area where the reel contacts the bed knife REEL TO BED KNIFE ADJUSTMENT The reel is adjusted to a fixed position bed knife This construction allows a more rugged and durable frame and retains the proper adjustment longer The Reel Adjuster Bolt A regulates reel distance from the bed knife To reduce the distance turn the upper hex adjuster nut on each side of the reel down Proceed slowly and do not over adjust use about 1 8 of a turn on each side at first B N Sr T a CN KU Ss REEL ADJUSTMENTS NOTE Guards removed or cut away to show detail 22 Do not adjust one side more than the other unless the reel is obviously out of alignment Do not get the reel so tight that it is hard to turn by hand A too tight reel will wear faster Ideally the reel should wipe or lightly touch the bed knife It is not necessary to adjust or change the position of the lower adjustment nut Proper cutting action may be tested by holding paper st
17. 7 205459 PIVOT Switch 1 18 202798 SPRING Return 1 19 205460 ARM Spring 1 20 200123 BUSHING 1 680M 06 03 31 DRIVE MECHANISM UPPER PORTION 680M 06 03 32 DRIVE MECHANISM UPPER PORTION Item OND AJO 680M 06 03 Part No 200530 03607 03608 200179 200176 200172 200173 202445 201541 201538 200165 08021 202437 200162 03609 03903 200208 200184 04501 200163 07024 09002 03606 200157 03902 04013 02602 06006 200154 200158 03901 Description GUIDE Belt High Speed Pulley PULLEY Countershaft Idler IDLER Engine Clutch ARM Engine Clutch ARM Countershaft Idler ROD Countershaft Idler Control BRACKET Idler Pivot STUD Belt Guide BELT GUIDE Lower BELT GUIDE Upper ROD Main Clutch Upper ROD Main Clutch Lower SPRING COLLAR Lock PULLEY Motor BELT Engine Kawasaki 6844 Gates Rated KEY Square Engine ARM Main Belt Idler SPRING Main Belt Idler Arm LEVER Engine Clutch KNOB Clutch Lever GUARD Engine Clutch PULLEY Main Countershaft COUNTERSHAFT Main BELT Drive B66 KEY Woodruff 11 DUST CAP 3 4 1 0 BUSHING Main Countershaft Housing HOUSING Main Countershaft STEP PULLEY Main Countershaft BELT Countershaft A29 Qty Al po p 2 ala ch 2 ala 212 la 4 ala 2 ap a NATIONAL 68 SR amp DL TRIPLEX 33 DRIVE MECHANISM MIDDLE PORTION Item Part No Description Qty 1 2
18. CUTTING UNIT CHAIN TENSION A chain drive is located on the left side of the rear cutting unit It maybe helpful to remove the Chain Shield A prior to adjusting the chain tension Adjust the tension of the chain by loosening the 4 bolts B on the rear cutting unit countershaft housing Rotate the countershaft housing C about the pivot line created by the fixed bolts The slots on the countershaft housing will slide over the remaining two bolts Rotate the countershaft housing until proper chain tension is achieved Tighten bolts Proper tension is achieved when the chain is slightly loose but does not deflect more than 1 2 when pressed in the middle of the span between the two sprockets 24 BED KNIFE REPLACEMENT Reels andbed knife are sharp Wear gloves to avoid cutting fingers on sharp edges Wear safety glasses to protect eyes When the bed knife becomes damaged or too worn to keep sharp it must be replaced Follow the procedure below 1 The backbar A bed knife B and fasteners C D have been assembled at the factory under tension To ease replacement and prevent misalignment of compo nents you may wish to clamp the leading edge of the backbar in two orthree places before removing the old fasteners 2 Remove the old shoulder nuts C and flat head screws D If shoulder nuts are badly rusted or corroded they may have to be cut off and screws driven out to be removed 3 Clean the bottom surfac
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20. Mower Arm 1 680M 06 03 35 DRIVE MECHANISM MODEL 68 DL 680M 06 03 36 NATIONAL 68 SR amp DL TRIPLEX DRIVE MECHANISM MODEL 68 DL Item Part No Description Qty 1 09100 GUARD Engine Clutch 1 2 201881 RETAINER Mowing Belt 1 3 201884 RETAINER Transport Belt 1 4 201890 MOUNT Belt Guides 1 5 201872 STEP PULLEY Main Countershaft 1 6 03603 PULLEY Transport Main Countershaft 1 7 02507 Washer 10 GA 2 8 03502 O RING 7 8 Dia 2 9 06101 NEEDLE BEARING 2 10 03902 BELT Drive B66 1 11 03655 PULLEY Main Countershaft 1 12 04013 KEY Woodruff 11 3 13 201871 COUNTERSHAFT Main 1 14 201740 HOUSING Main Countershaft 1 15 200208 KEY Square Engine 2 16 03926 BELT Engine Transport 6841 Gates Power Rated 1 17 03602 PULLEY Engine Transport Belt 1 18 03903 BELT Engine Mowing 6844 Gates Power Rated 1 19 03609 PULLEY Engine Mower Belt 1 20 202780 BELT GUIDE WELDMENT Engine 1 21 202446 STUD Belt Guide 1 22 201946 BRACKET Idler Pivot with Bushings 1 23 200530 GUIDE Belt 1 24 202441 SPRING Transport Pedal Return 1 25 03608 PULLEY Idler 1 26 201721 FOOT LEVER 1 27 201728 ARM Idler Lower Countershaft 1 28 201730 ARM Idler Mowing Belt 1 29 03607 PULLEY Clutch Lever 1 30 201718 PULLEY LEVER Transport 1 31 201889 GUIDE Belt 1 32 201919 ROD Transport Clutch 1 33 202440 SPRING Transport 1 34 201966 PEDAL Transport 1 35 205481 CARRIER Lowe
21. ONS CAUTION Wear protective gloves Steel 3 Unbolt Seat 3 from crate bracing and lay seat aside banding is sharp Handle cutting for installation later units carefully Reels rotate freely and are very sharp 4 Lift Rear Cutting Unit 4 off the crate Supporting members and set aside for later attachment In order to prevent possible damage to the machine or 5 Make sure Wing Cutting Units 5 are in their upright personal injury the following uncrating procedure must positions secured to the mower frame with Wing be followed Cutting Unit Latches 1 Position Crate 1 on hard level surface 6 Knock down all sides of crate and remove Roll mower backwards off of crate base 2 Cut and remove all Steel Banding 2 Remove the entire top of the crate 680M 06 03 11 ASSEMBLY WARNING Improper assembly or adjustments can cause serious injury SEAT Mount the Rear Cutting Unit Lifter and Seat Assembly A to the mower frame using 2 1 2 bolts nuts and washers B Fasten the seat slides C to the bottom of the seat D using the fasteners provided with the slider mecha nisms Orient the slider so the adjuster lever E is on the operator s left hand side Remove the seat switch bracket F 1 x 10 bar mounted near the ends of the legs of the seat hinge Discard the fasteners Mount the seat and slider as sembly onto the seat hinge G Replace the seat switch bracket and ti
22. OZ vi pueH 19619 ATEWNISSV HalHHVO GEL 107 EL 2 HNIHSNE 90090 21 14VHSYHILNNOD 92007 LL Jamo Jeey 398NL LOAld 182002 01 Buueeg LAN 8 MIYOS DNILSNFOV 952002 6 2 ATENSSSV dN IMVL 1334 9 2007 8 J9MO N 11 601007 2 H T 13990V48 H3TIOH 872602 9 2 yoyoeg 191104 HILSNFAV G HdTlOH 867702 pieius 1 HDIYdN G 2007 2 45 13MOvug 19102 2 dn pue 96 amoy yno auvno 0 160 NO uondioseg ON woy 43 680M 06 03 SKIDS REEL END SHIELDS 8 GUARDS Item Part No Description Qty 1 203728 SKID BAR L H 1 2 202959 SHIELD Wing Mower 3 3 201585 SKID Mower 2 4 203727 SKID BAR R H 2 5 202410 GUARD Inside Rear Mower 1 6 202281 CHAIN GUARD Rear Mower 1 44 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX ROLLERS amp STANDARD SCRAPERS ROLLER ASSEMBLY 21 P N 204497 includes items 1 4 ROLLER ASSEMBLY 30 P N 204499 Includes items 1 4 ROLLER SCRAPER KIT P N 860032 includes items 5 8 Item Part No Description Qty 1 205330 CAP Bearing 2 2 06142 BEARING Roller 2 3 204500 SHAFT Roller 21 1 204499 SHAFT Roller 30 1 4 204502 WELDMENT Roller 21 1 204501 WELDMENT Roller 30 1 5 02228 NUT Jam 5 16 24 12 6 205375 BRACKET Roller Scraper L H 3 7 09092 CABLE Roller Scraper 21 2 09090 CABLE Roller Scraper 30 1 8 205376 BRACKET Roller Scraper R H 3
23. S IN REVERSE 07585 ENGINE THROTTLE located on steering wheel Move the engine throttle lever forward for fast speed backward for slow speed 07586 IGNITION KEY Model 68 DL located on instrument cluster panel To start the engine sit on the seat and place all cutting unit clutches in neutral Turn the key to the full clockwise position to start the engine Use the choke as required Once the engine has started release the key and allow it to rotate to the central run position To stop the engine turn the key to the full counterclockwise position Refer to the engine manual for details on proper engine operation Disengage cutting unit clutches engage the parking brake and remove the key whenever leaving the mower seat SAFETY AND CONTROL DECALS 07587 IGNITION KEY Model 68 SR located on top surface of main belt guard To start the engine place the main clutch and all cutting unit clutches in neutral Turn the key to the clockwise position and pull on the recoil starter Use the choke as required To stop the engine turn the key to the full counterclockwise position Refer to the engine manual for details on proper engine operation Disengage cutting unit clutches engage the parking brake and remove the key whenever leaving the mower seat 07588 PARKING BRAKE LEVER located on top surface of main belt guard Move the parking brake lever forward to set the brake rearward to
24. Skids and Reel End Shields not shown See parts page Skids Reel End Shields amp Guards WING CUTTING UNITS 680M 06 03 40 WING CUTTING UNITS NATIONAL 68 SR amp DL TRIPLEX Item Part No Description Qty 1 201513 BRACKET Shield 4 2 200235 UPRIGHT Shield 4 3 204497 ROLLER 21 2 4 203248 ROLLER BRACKET L H 2 5 204495 ADJUSTER Roller 4 6 201775 FRAME Bed Knife Bolt on 2 7 02109 SCREW Flat Head 14 201802 NUT Bed Knife Screw 14 8 201504 BED KNIFE 21 2 9 04549 SPRING Reel Adjusting 2 10 200236 REEL TAKE UP ASSEMBLY 4 11 302550 REEL CARRIER ASSEMBLY Left Hand 2 12 06120 BEARING Reel Includes Race 4 13 200296 REEL ASSEMBLY 6 Blade 2 14 201781 FRAME Wing Mower 2 15 200256 ADJUSTING SCREW amp NUT Bearing 2 16 201437 TAKE UP WASHER Reel Bearing 2 17 201383 CAP SCREW Special Pulley Scraper 2 18 200287 PULLEY SCRAPER 2 19 302549 REEL CARRIER ASSEMBLY Right Hand 2 20 03931 BELT Wing Cutting Unit Gates A34 2 21 03601 PULLEY 2 22 201520 SHIELD Right Hand 1 201521 SHIELD Left Hand 1 23 202261 SHIELD Belt L H 1 202260 SHIELD Belt 1 24 203172 ROLLER BRACKET R H 2 680M 06 03 41 uSPJEND SP AIUS sphis syed 98S UMOUS jou spjeius pue SPMS 310N LINN 9NLLLOO HV3H 680M 06 03 42 NATIONAL 68 SR amp DL TRIPLEX L 1294 T3IHS 6161
25. TENANCE AND STORAGE Keep all nuts bolts and screws tight to be sure the equipment is in safe working condition Never store the equipment with fuel in the tank inside a building where fumes can reach an open flame or spark Allow the engine to cool before storing in any enclosure To reduce the fire hazard keep the engine silencer battery compartment and fuel storage area free of grass leaves or excessive grease Replace worn or damaged parts for safety If the fuel tank has to be drained this should be done outdoors When machine is to be parked stored or left unattended lower the cutting means unless a positive mechanical lock is used Be careful during adjustment of the machine to prevent entrapment of the fingers between moving blades and fixed parts of the machine On multi reel machines take care as rotating one reel can cause other reels to rotate CALIFORNIA SAFE OPERATING PRACTICES Mowers used in California USA are required by law CA PRC 4442 amp CA H amp SC 13005 to have their engines equipped with spark arresters when operating in flam mable vegetation Arresters must be obtained from your engine dealer and are not available from National Mower Company 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX SAFETY AND CONTROL DECALS Safety decals and instructions are located on the mower near the controls or near areas of potential hazards Worn damaged or loose decals must be replaced The dec
26. accidents or hazards occurring to other people or their property Do not carry passengers All drivers should seek and obtain professional and practical instruction Such instruction should emphasize the need for care and concentration when working with ride on machines control of a ride on machine sliding on a slope will not be regained by the application of the brake The main reasons for loss of control are insufficient wheel grip being driven too fast inadequate braking the type of machine is unsuitable for the task do not use mower for unsuitable tasks lack of awareness of the effect of ground conditions especally slopes hitching and load distribution do not hitch or tow other devices 2 PREPARATION WARNING Gasoline petrol is highly flammable Store fuel in containers specifically designed for this purpose Refuel outdoors only Do not smoke while refuelling Add fuel before starting the engine Never remove the cap of the fuel tank or add fuel while the engine is running or when the engine is hot If fuel is spilled do not attempt to start the engine but move the machine away from the area of spillage and avoid creating any sources of ignition until fuel vapors have dissipated Replace all fuel tanks and container caps securely While mowing always wear substantial footwear and long trousers Do not operate the equipment when barefoot or wearing open sandals
27. al part number and the location of the decal on the mower are listed next to each decal 07581 MAIN ENGINE CLUTCH LEVER located on top surface of engine belt guard Move lever backward to put clutch in neutral position forward to cause mower to travel direction depends on differential shift position WARNING Engage the clutch slowly Refer to instructions inthe OPERATIONS section 07582 DIFFERENTIAL SHIFT LEVER located on top edge of differential gear drive Move the shift lever and set it in the notch to place the differential into Forward Neutral or Reverse NEVER SHIFT THE DIFFERENTIAL WITH THE MOWER IN MOTION OR THE MAIN ENGINE CLUTCH ENGAGED 07583 WING MOWER CLUTCH located on top surface of main belt guard Move the clutch lever back to engage the wing mower clutch Move the lever forward to put the clutch in neutral 680M 06 03 07584 TRANSPORT CLUTCH PEDAL Model 68 DL located on top surface of engine belt guard Pressing the pedal will cause the mower to run in high speed transport mode Operate the transport clutch by slowly pressing the pedal with your left foot Releasing the pedal will cause the mower to coast to a stop or resume mowing speed Before using disengage the cutting unit clutches and raise the cutting units to their transport position WARNING NEVER USE THE TRANSPORT CLUTCH WHILE THE CUTTING UNITS ARE TURNING OR WHEN THE DIFFEREN TIAL SHIFT I
28. ated on top surface of rear cutting unit Pull lever forward and toward the center of the machine to engage sliding jaw clutch To disengage pull lever forward and out to engage locking pin Never engage the drive unless the rear cutting unit has been lowered to the cutting position Note that the decal is viewed properly while looking toward the rear of the mower NATIONAL MOWER COMPANY 700 RAYMOND AVE ST PAUL MINNESOTA 55114 USA 651 646 4079 FAX 651 646 2887 07595 MANUFACTURER SOUND LEVELS located on left side of main belt guard 7 5 HP 5 6 KW 3600 RPM 659 LBS 299 KG 2003 PATENT S PENDING Guaranteed sound power level and manufacturer s information National 68DL National 68SR 07415 MODEL 68 DL LABEL 68 DL only 07598 MODEL 68 SRLABEL 68 SR only located on left side of engine belt guard and right side of main belt guard 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX NATIONAL MOWER CO 700 RAYMOND AVE ST PAUL MIN 55114 U S A 07083 SERIAL NUMBER DATA PLATE located on mower frame left side below seat 07600 CUTTING UNIT DANGER located on top surface of each cutting unit Reels and bed knives on the cutting DANGER units are sharp Keep hands and feet away from the cutting units DANGER Do not attempt work around the cutting units while they are running Your fingers hands arms or any loose clothing may become entan
29. aylight or in good artificial light Never make a cutting height adjustment while the en gine is running Shut the engine off when removing grass or unclogging reels This machine is to be used only as a grass cutter or lawn mower Never operate the mower while using drugs medications or alcohol Safe operation requires complete and unim paired attention Never allow anyone to operate the mower when their alertness or coordination is impaired Do not wear loose clothing or loose shoelaces which may become entangled in mower controls or drive compo nents 680M 06 03 Do not mow in reverse unless absolutely necessary Always look down and behind before and during reverse motion Shut off and raise the cutting units before operating the mower at transport speed Model 68 DL only Do not reverse battery connections Damage to the mower can result Battery gases are explosive and can cause death or injury Keep open flames sparks and smoking materials away from batteries Battery fluid contains sulfuric acid Contact with skin eyes or clothing can cause chemical burns Wash immediately and seek medical assistance Wear protective clothing and safety glasses when handling a battery Model 68 DL only 4 HILL OPERATION Do not stop or start suddenly when going uphill or downhill Mow up and down the face of steep slopes never across steep slopes Do not exceed a slope of 15 in any direction Reduce travel
30. chine will disengage the brake N Service Brake Depressthe Ser vice Brake foot pedal to slow the mower and lock the rear wheels in the full stop position Note It is best to slow the mower with the throttle and then disengage clutch lever before applying brake This prevents excessive wear and engine overload SAFETY SWITCHES Your National 68 mower is equipped with safety switches to monitor the operating conditions of certain machine functions and stop the mower whenever unsafe conditions are found It is necessary for both the main engine clutch and the wing cutting unit clutch to be in their neutral position to start the engine The 68 DL also requires the operator be inthe seat The 68 SR does not require the operator to be in the seat to facilitate use of the hand recoil starter If you encounter difficulties starting the mower s engine or keeping it running check the chart in the Safety Switches section of this manual to make sure you are not causing the engine to kill or become unable to start 680M 06 03 HEIGHT OF CUT ADJUSTMENT To assure safety disengage the engine clutch lever remove the ignition key and disconnect the engine spark plug wire prior to making any of the following adjustments 1 STANDARD ADJUSTERS The height of cut is variable and may be adjusted on both wing cutting units and the rear cutting unit by loosening the top and bottom Adjusting Nuts A which hold Roller Adjus
31. commended lubrication maintenance and adjustments SAFETY INFORMATION The safety alert words below are used in this manual to identify potentially hazardous conditions Their definitions are means IMMINENTLY HAZARDOUS SITUATION If not avoided WILL RESULT in death or serious injury means POTENTIALLY HAZARDOUS SITUATION If not avoided COULD RESULT in death or injury means POTENTIALLY HAZARDOUS SITUATION If not avoided MAY RESULT in minor or moderate injury It may also be used to alert against unsafe practices The safety alert triangle symbols on your mower point out important safety precautions AA These symbols mean ATTENTION PERSONAL SAFETY IS INVOLVED BECOME ALERT OBEY THE MESSAGE NATIONAL MOWER SAFE OPERATING PRACTICES 1 TRAINING Know the control functions and how to stop quickly READ THE OWNER S MANUAL 2 PREPARATION Clear the work place of objects which might be picked up by the blades and thrown Handle fuel with CAUTION it is highly flammable Use an approved fuel container Never remove the fuel tank cap or add fuel to a running or hot engine Never fill the fuel tank indoors Wipe up spilled fuel immediately Open garage doors to allow ventilation if engine is run inside exhaust fumes are dangerous Do not run en gine in any enclosed area Keep the mower in safe operating condition Make sure that all safety switches are operating prop
32. e 25 MAINTENANCE RECORD Date Maintenance Task 26 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX TROUBLE SHOOTING DANGER All adjusting must be made with the engine off Do not do any investigation of the working parts of the machine with the motor running Always turn the engine off Tractor Unit CSC Things To Check Engine will not start Mower will not move Mower will not stop Cutting Units Cutting units will not turn Cutting units turn but will not cut Cutting units will not stop turning Uneven cut 680M 06 03 Turn ignition switch to on Ensure that there is sufficient gasoline petrol in the tank Make sure safety switches are making contact and mowing clutch is in neutral Look for a loose wire on ignition or spark plug wire not connected Interlock system inoperative check wiring see Electrical Diagrams Operator must be positioned on seat to depress safety switches Model 68 DL only Differential gear selector must be in one of the drive positions Engine drive clutch must be engaged Drive belts too loose see Drive Belt Tension in Maintenance section Visually check to see that pulleys are not slipping on shafts If everything above is OK check for a damaged gear s in the differential gear box Ensure that the main clutch is disengaged brake will not stop engine Brake adjustment or service may be needed Clutches may not be engaged Look for anything that could be jamm
33. e of the backbar for maximum metal contact with the new bed bar 4 Fasten the new bed knife to the bottom of the backbar in the position shown bent edge up Shoulder of shoulder nuts C must be seated firmly in the backbar and screws D must be flush with the bottom of the bed knife 5 Torque shoulder nuts 35 to 40 ft lbs 680M 06 03 BACK LAPPING PROCEDURE DANGER Be extremely careful not to let the brush your fingers or your clothing get caught in the reels Wear gloves to avoid cutting fingers onsharp edges Wear approved safety glasses to protect your eyes from flying particles and abrasives INTRODUCTION Back lapping is a very important step in maintaining sharp reel blades on the cutting units This procedure should be performed when the reel blades and the bed knife become slightly rounded and the grass is not cut cleanly with only a slight reel to bed knife adjustment Also after grinding the bed knife and reels you should back lap to establish a perfect match between the bed knife and reel blades RECOMMENDED STEPS 1 Adjust the reel to the bed knife so that the bed knife is parallel to the reel and light contact is maintained 2 Reels must be run in a reverse direction to be lapped Remove the lower drive belts and attach a back lapping machine not supplied by National Mower to the reels Follow the instructions furnished by the machine manufacturer 3 Apply the lapping compound with the r
34. ed between the reel and the bed knife Drive belts or drive chain may need tightening Visually check that both the drive pulleys and the shafts are rotating Reel bed knife position may be out of adjustment see Reel to Bed Knife Adjustment in Maintenance section Drive belts or drive chain may need adjustment Visually check that both the drive pulleys and the shafts are rotating Disengage all clutches Set height of cut to the same height on each cutting unit see Cutting Height Adjustment in Operation section of this manual Check to see if any part is bent Something may be jammed in cutting unit pivots and or lift pivots preventing the cutting units from floating 27 PARTS LIST FRAME amp RUNNING GEAR 28 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX FRAME amp RUNNING GEAR Item Part No Description Qty 1 200002 FRAME 1 2 07018 REAR TIRE WHEEL ASSEMBLY 2 3 200085 FOOT REST Left Hand 1 4 201961 BUSHING Axle Pivot 2 5 06002 BUSHING Spindle and Steering Post 6 6 09014 DRAG LINK 1 7 200193 KING PIN Left Hand 1 8 07038 TIRE amp WHEEL 2 9 200094 SHAFT Steering 1 10 201427 AXLE ASSEMBLY Front 1 11 201851 TIE ROD 1 12 04003 PIN Clevis Tie Rod 1 13 200196 KING PIN Right Hand 1 14 200033 BUMPER Front 1 15 06112 BEARING Wheel Hub 4 16 02602 DUST CAP 3 4 I D 2 02603 DUST CAP 7 8 I D 2 17 200863 CLEVIS Threaded Tie Rod 1 18 200104 PEDAL Brake 1 19 200139
35. eels running using a 2 or a 3 5 7 5 cm brush Apply the compound evenly to the moving blades Many types of compounds are available for lapping We recommend a good pre mixed water soluble compound Pre mixed compound saves the time required to mix eliminates the waste of abrasive rinses off easily with water and is available in all grit ranges from coarse to extra fine 4 Stop the reel and examine both bed knife and reel blades to see that the cutting edges are uniformly sharp If not gradually tighten the reel adjuster bolts see Reel to Bed Knife Adjustment above and repeat Step 3 until the proper sharpness results 5 Rinse off the compound thoroughly with water to remove all abrasive Check for sharpness and readjust the bed knife if necessary Reel to bed knife contact should be adjusted to easily cut a sheet of paper see Reel to Bed Knife Adjustment above 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX BACK GRIND IN THE DIRECTION OF THE ARROW 25 Note position of blades to reel axis GRINDING REELS Reels must be ground at 25 in the direction shown by the arrow in the figure Back grind until reel blades are free from roundness dents and nicks Spin grind to remove all burrs All blades must be on the same diameter LL D gt SAD lt A ER 22 Y RSENS GRINDING BED KNIVES For maximum cutting efficiency grind bed knife top and front edges at 5 as shown in the figur
36. ent of defective parts is the purchaser s exclusive remedy for any defect malfunction or breach of warranty Liability for incidental or consequential damages under any and all warranties is excluded to the extent permitted by law NATIONAL MOWER COMPANY P O Box 14299 700 Raymond Avenue St Paul Minnesota 55114 0299 U S A Phone 651 646 4079 Fax 651 646 2887 www nationalmower com 680M 06 03 TABLE OF CONTENTS Warranty EE Introd ctlOn eee ERROR Safety Information sese Safety and Control Receipt of Shipment 2 Uncrating Instructions 2 ES EE Preparation hei Operations rien Pee eR OI Maintenance keine Maintenance Record Troubleshooting eese Parts List eene euo pete Frame amp Running Gear 0022 Running Gear amp Misc Parts 68 DL Seat Mounting amp Belt Guards Drive Mechanism Upper Portion Drive Mechanism Middle Portion Drive Mechanism Lower Portion Drive Mechanism 68 D Rear Axle amp Wing Cutting Units eseeeeeeeeene Rear Cutting Unit Skids Reel End Shields amp Guards Rolle
37. erly and all 4 safety guards are in place at all times except during servicing Keep all nuts bolts and screws tight 3 OPERATION Wear approved safety glasses or goggles when operating the mower Do not allow children to operate mower Do not allow adults to operate mower without proper instruction Do not carry passengers Keep children and pets at a safe distance from an operating mower Stop the mower if anyone approaches the mower Disengage all cutting unit clutches and shift into neutral before attempting to start the engine Disengage main clutch before shifting cutting unit clutches Disengage power to the cutting units and stop the engine before leaving the operator s position Disengage power to the cutting units and stop the engine before making any repairs or adjustments Disengage power to the cutting units when transporting or not in use Take all possible precautions when leaving the mower unattended including shifting into neutral setting the parking brake stopping the engine and removing the ignition key Watch for dangerous traffic when crossing or near road Ways Never directthe discharge of material from operating reels toward bystanders nor allow anyone near the mower The mower and reels should be stopped and inspected for damage after striking a foreign object The damage should be repaired before restarting and operating the mower Proceed as follows when mowing Mow only in d
38. excessive belt wear IMPORTANT Never allow oil to get on the belt which could cause slipping MAIN DRIVE BELT TENSION Main Countershaft to Rear Drive Belt tension is increased by loosening the four bolts holding the Upper Countershaft Housing A and sliding the housing forward in the slotted frame holes NOTE It willbe necessary to remove belt guards to reach the adjustment bolts Also if this belt is adjusted it will be necessary to readjust the engine belt Replace all belt guards before using the mower ENGINE DRIVE BELT TENSION Engine to Main No photo Belt tension is increased by loosening the four engine mounting bolts and sliding the engine forward in the slotted frame holes Test forthe proper tension as detailed in the section Wing Cutting Unit Drive Belt Tension When tension is correct tighten all the bolts securely 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX WING CUTTING UNIT DRIVE BELT TENSION Adjust tension by loosening set screw B in the wing mower pull arm sliding the Cutting Unit rearward and retightening set screw FRONT OF MACHINE REAR CUTTING UNIT DRIVE BELT TENSION Spacers A are provided on the rear mower Pull Rod B to adjust the belt tension Remove Pin C from the end of the pull rod and slip out the pull rod from the Pivot Tube D Move as many spacers as necessary to the location indicated and reassemble 23 MAINTENANCE REAR
39. ghten fasteners Plug the wire harness socket H into the seat safety switch J Use care in routing the wires so that they are not pinched by the switch lever or seat support mechanisms REAR CUTTING UNIT 1 Pivot the Seat Brace A from the axle so that the top end aligns with the tab at the back of the seat hinge assembly Fasten with a 5 16 x 1 Hex Head Bolt Lock Washer and Hex Nut Slide the rod end of the lifter tee B through the hole C in the pad on the rear mower frame and secure it to the lift arm pivot with the cotter pin and washer as shown at D Attach the Pull Rod E to the cutting unit Pivot Tube F with Pin and Spacers NOTE Before completing assembly it will be necessary to adjust the drive belt tension See Rear Cutting Unit Drive Belt Tension in the Maintenance section of this manual page 23 680M 06 03 REAR CUTTING UNIT BELT Install Rear Cutting Unit Belt A from Countershaft Pulley B to outer Drive Pulley C Idler Pulley D must ride on top of lower belt provide proper tension NOTE It will be necessary to raise rear cutting unit to allow enough slack to get belt over pulleys 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX WING CUTTING UNITS 1 Remove the two Wing Cutting Unit Belts from the steering column 2 Release the Laches A from Wing Cutting Units To release the latch lift the wing cutting unit handle until the latch swings upward into a nearly
40. gled in the belt drives Do not operate the cutting units unless you are seated on the mower Keep all guards and shields in place 205341 INSTRUCTIONS for OPTIONAL DIAL A HEIGHT ADJUSTER located on the top shield of each cutting unit Raise and turn the adjuster knob counterclockwise to lower the height of cut Raise and turn the adjuster knob clockwise to raise the height of cut Read the instructions for the Dial A Height adjusters in the Operations section of this manual SAFETY AND CONTROL DECALS u __ __ e m 1 i IRER 8400 205399 Optional DIAL A HEIGHT SCALE Rear cutting units 205346 Optional DIAL A HEIGHT SCALE Wing cutting units located on each Dial A Height bracket Align the bottom edge of the Dial A Height bracket with the desired height of cut on this decal Read the instructions for the Dial A Height adjusters in the Operations section of this manual 10 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX RECEIPT OF SHIPMENT Carefully inspect your machine and crate for damage that could have occurred during shipment If damages or shortages are noted have the transportation company s representative note this on the bill of lading Note Claims for shipping damages must be noted by the consignee at the point of destination and filed with the transportation company that delivers the shipment UNCRATING INSTRUCTI
41. mo euoneN ONNYY TMYSSLVLINHOJNOM YSN Ned 16 2002 22 uo1eN JO 2A juepiseJd 111 PESYUIM lt H ADTA SA a nyeu ls pezuouiny Jejjewpues 0629 1 ap anos LL ep 9181908 poq JO ssaJppe v ap GOL 10 4amod punos G99LNVYVND e pue v gP 26 10 jewod punos GJYNSVAN Bumoeun pue 90 Jo JUBLUSSESSY uononpoJd jo ue IA 03 71 0007 933 988 68 93 18 86 sjueuipueuie jueJ1no 1194 pue saAnoeJiq eui jo suoneoyioeds 34 89 221 JEMON 13 89 pue amo HS 89 SJOMOUI UMP 891 941 1291 YSN WLIGG 0 Ned 16 enueAy 002 Auedwon J8MOo N ALIINHO3NOO NOILVHV 1940 ONIYV DIH3ASLISLINHOJNOO GVAINYO4NOD NOIOVHV 1903G ALINYOANODO NOILVHV 1930 ONNUVTMYSISLVLINHOSNOM ALIINHOJ3NOO NOILVYV 1940 2 288079097169 4 640 979 199 7191 6620 1 195 B oSoUuUIW 1 66 O d enueAy puowAey 002 ANVdINOD YSAMOW sIVNO
42. ng Unit Latch NEVER ATTEMPT TO RAISE THE WARNING WING CUTTING UNITS WHEN THE WING MOWER CLUTCH IS ENGAGED The Wing Cutting Units should be latched in their elevated position whenever the mower is being transported or in storage If needed push the latch E down to a generally horizontal position Grasp the Wing Cutting Unit lift handle not shown and raise the cutting unit until the latch E engages the lift arm socket F To release the latch lift the handle until the latch E swings upward into a nearly vertical position then carefully lower the cutting unit onto the ground Avoid dropping the cutting unit as damage may result to the cutting unit the mower or your turf 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX G Rear Cutting Unit Clutch Engages drive to the Rear Cutting Unit Pull lever forward and toward the center of the machine to engage sliding jaw clutch To disengage pull lever forward and out to engage locking pin Never engage the drive unless the rear cutting unit has been lowered to the cutting position H Rear Cutting Unit Lift Arm Raises rear mower to the transport position Pull handle up forward and over center to lock it in the up position J Seat Position Adjuster Lever d IT DO NOT OPERATE THE SEAT SLIDE MECHANISM WHILE THE MOWER IS MOVING The seat may be moved forward or backward to suit the operator Pull the lever near the front left corne
43. om edge of the adjuster tube B The reading on the scale is your approximate height of cut You should determine the exact settings by test mowing your turf If very accurate cutting heights are required place the cutting units on a hard level surface and place a board or other gauge plate of the desired height under each bed knife backing bar Lower the rollers to the level surface When completed make sure the socket is locked in position over the adjuster tube DIAL A HEIGHT ADJUSTER OPTIONAL OTHER ADJUSTMENTS For other machine adjustments see the Maintenance section of this manual 17 MAINTENANCE LUBRICATION Lubricate the machine at the recommended locations and intervals using the proper lubricants to ensure maximum service and long life of your machine leakage is evident it is recommended that the grease be checked once each year Check grease level by loosening the bolts in the differential case flanges and spreading case halves It is not necessary to totally disassemble the Lubrication locations must be free of dirt and grass case or remove the wheels for this inspection Add Multi clippings and be well lubricated for proper operation purpose Gear Grease such as Pennzoil No 303 or O equivalent if necessary Total grease capacity is 1 1 2 The location and number of all lubricating points are listed pounds 0 68 kg in the chart below The type and frequency of lubrication is specified Use the
44. on level A 0 86 m sec rms 52 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX PARTS ORDERING INFORMATION When ordering replacement parts always furnish 1 Your complete name address and phone number 2 Model Number and Serial Number stamped on the main frame rear axle gusset below seat 3 Part Number it is recommended that the correct number be verified with a current Master Price List 4 The full Description of the part 5 Quantity desired quantity shown is the total number of parts contained in the particular view shown If the Part Number and the Description of your order do not agree the Part Number will be used to fill your order Note For your records and future ordering fill in the following information el mem Ee V BELT CROSS REFERENCE CHART Funston Bet Mr Number Lower Countershaft 29 Main Belt B66 Rear Cutting Unit 03905 A42 Transport 68DL 03926 Gates 6841 Wing Cutting Units 2 03931 A34 680M 06 03 sjeejd ue wepiseig PESYU S H 2274 SA Buiuexejpueu NATIONAL 68 SR amp DL TRIPLEX JejjeMpues 0624 1 ep LL D ep 8191005 5 1596 316004 do WEEN 901 use ue v gp 26
45. r amp Standard Scrapers Roller Scraper Kit Dial A Height Dial A Height Roller Adjuster Kit Dial A Height Adjuster Safety Switches Electrical Diagrams 22 Electrical Parts ee need Parts Ordering Information Declaration of Conformity INTRODUCTION This manual has been prepared by National Mower Company as an aid to users in the assembly safe operation maintenance adjustment and ordering re placement parts Additional information will gladly be furnished by calling or writing the manufacturer or his authorized agent Please furnish us with the Model Number Serial Number and Date of Purchase when contacting us about your machine Designations of right left front add rear are used as if the operator was sitting in the mower seat 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX Before operating mower carefully and completely read this manual The contents provide you with an understanding of safety instructions and controls during normal operation and maintenance Understand all safety precautions provided in the manuals Review control functions and operation of the mower Do not operate the mower unless all controls function as described in this manual Review re
46. r Cooled 4 cycle Horizontal Shaft OHV Engine Number Of Cylinders 5 don reo kl One Piston Displacement rtt Peer e rece et eben 13 1 cu in 215 cc Maximum Horsepower 7 5 hp 5 6 kW 3600 rpm Corrected per SAE J1349 Direction Of Counterclockwise facing the power take off shaft Maximum Speed AAA 3600 100 rpm Fuel nonni need RR Re E mI du tide Edd Unleaded Gasoline Petrol Fuel Tank Capacity n erat pr d etes 4 80 US qt 4 5 liter Maximum Fuel Consumption 2 0 68 gal hr 2 4 liter hr OW r mett dh utet Eg lc eee dde EE SAE 30 Engine Oil IR lee TEE 30 fl oz 0 90 liter GC arDUFetor E Float Type with Fixed Main Jet Starter 68 Recoil Starter with Automatic Compression Release Starter 68 DD damas Electric Starter and Recoil Starter Dubicatiohn Type niit aee tee tec ee EE Splash lee MED Dual Element Low cc 12v 10 68 DL Net Weight Engine 47 lbs 21 4 kg SOUND amp VIBRATION LEVELS Average Measured Sound Power 99 dBA Guaranteed Sound Power 105 dBA Average Measured Sound Pressure at operator 87 dBA Hand Arm Vibration level enne 3 79 m sec rms Whole Body Vibrati
47. r Countershaft 1 680M 06 03 37 REAR AXLE amp DIFFERENTIAL NATIONAL 68 SR amp DL TRIPLEX TVILNIYIHHIG 8 ITXV ONIHdS LySVO 89 5 9 9002 19 Z 4285 DNIHSNE 70090 JOWIUS H3lHHVO 90002 99 ATENSSSV 3 1XV 920007 ve Buys LINN 14 5 1 950002 99 IIO was 20960 26 ONIY O 11560 v9 14618 ANH eau TWAS OSIA 114 780002 LE LSNA 20920 9 8 1 70920 pueg H3A31 201007 29 8 1 H3HSVM LSNA 089002 62 43901 19 2 984M DNIHSNE 90090 82 Dunius JvHS 550002 09 19614 1894M Ee ANH 620007 22 6 HNIPOOM AIM c LOTO 65 episino ENUSJSJIG YAAOO 490002 92 WNNYO 260002 89 146 134Sv5 60040 Gz deis 81920 19 8HUSJSJIG NOINId 690002 8 LSNA 20920 96 Jeep asJeney HVHS 640007 ez 8 20460 SG 1299 5 20090 22 ATSNSSSV 660002 vS HV3O 050002 E 8 4901 0z0v0 Ce Duuue 750007 02 v L Jn4p00M AIM 1040 24 8 1 X 91 6 Buuds Nid 80070 6L PIELX HL 1894 Nid 91070 IG ase
48. r of the seat outward to release the slide mechanism After moving the seat to a comfortable position release the lever to lock the slide mechanism 15 OPERATION K Ignition Switch Model 68 DL shown ALWAYS SHUT OFF THE ENGINE AND REMOVE THE KEY BEFORE LEAVING THE MOWER SEAT The 68 DL ignition switch is located on the instrument cluster It is a three position switch Turn the key clockwise to the middle position to activate the electrical system Turn the key to the full clockwise position to start the engine Turn the switch counterclockwise to shut off the engine The 68 SR ignition switch not shown is located on the steering column It is a two position switch Turn the key clockwise to activate the electrical system and allow the engine to be started Turn the switch counterclockwise to shut off the engine L Differential Shift Lever Never shift while machine is in mo WARNING tion as damage to the gears could esult Always disengage engine clutch before attempt Located on the mower differential this control has three po sitions For ward Neu tral center position and Re verse The lever mustbe pulled to wardthe cen ter of the machine to clear the notch in the stop disc and positioned securely in the new notch M Parking Brake Lever Provides a lock for the brake Push brake lever forward over center to lock Pulling brake lever back toward the rear of the ma
49. release the brake Driving the mower with the parking brake set willcause excess wear onthe brake mechanism 07589 SERVICE BRAKE PEDAL located on top surface of main belt guard 07589 Press the brake pedal with your right foot to stop the mower You must also release the main engine clutch in order for the mower to come to a complete stop 07599 WARNING DECAL located on instrument cluster 68 DL ormain belt guard 68 SR Read and understand the information in the Owner s Manual be fore operating this mower Read and understand the information in the Owner s Manual before attempting to repair service or maintain this mower Turn off the mower engine remove the ignition key and disconnect the engine spark plug before attempting to repair service or maintain this mower The engine exhaust from this prod uct contains chemicals known to the state of California to cause cancer birth defects or other reproductive harm Do not operate the engine in aconfined space where dangerous carbon monoxide fumes can collect WARNING Objects may be thrown from the cut ting units Keep bystanders away from the mower Never allow the mower to freewheel down hills without the traction drive engaged Serious injury or death can result from loss of control Do not operate the mower on slopes greater than 15 degrees 680M 06 03 07590 REAR CUTTING UNIT CLUTCH loc
50. rips between the reel and the bed knife Turn the reel by hand and check to see if the assembly cuts the paper all the way across the width of the bed knife Make sure that the adjusting and the locking nuts on both side are tightened securely REEL END PLAY ADJUSTMENT Test for end play periodically by trying to move the reel from side to side in the frame If there is ANY movement adjust the bearings by loosening the lock nut on the adjustment bolt B which is located on the inside right end of the reels and turning the adjustment bolt IN one half turn or less Do not overtighten An overtightened bearing will cause excessive bearing wear Test again for end play and if reel is rotating freely and end play is not noticeable tighten the lock nut HEIGHT OF CUT ADJUSTMENT Refer to Height of Cut Adjustment in the Operation section of this manual BRAKE ADJUSTMENT The foot brake is properly adjusted if it slows the machine when depressed and can be locked when the pedal is depressed fully Adjust brake tension by removing cotter pin and brake pedal pin and turning brake clevis located under pedal on brake rod When adjustment is complete attach clevis to pedal with pin and cotter pin 680M 06 03 ADJUSTING DRIVE BELT TENSION Abelt adjusted for proper tension can be deflected slightly at a point midway between the pulleys An over tight belt will cause excessive bearing wear and an under tight belt allows slipping causing
51. rtain machine functions and stop the mower whenever unsafe conditions are found It is necessary for both the main engine clutch and the wing cutting unit clutch to be in their neutral position to start the engine The 68 DL also requires the operator be inthe seat The 68 SR does not require the operator to be in the seat to facilitate use of the hand recoil starter Main Engine Wing Cutting Clutch Unit Clutch Operator Presence ENGAGED ENGAGED NEUTRAL NEUTRAL ENGAGED NEUTRAL 680M 06 03 Seat Switch Wing Cutting NATIONAL 68 SR amp DL TRIPLEX If you encounter difficulties starting the mower s engine or keeping it running check the chart below to make sure you are not causing the engine to kill or become unable to start With the engine off and the ignition key removed check the switches regularly to make sure they are unobstructed by grass clippings or other material Make sure the electrical terminals remain clean and dry and the pivot mechanisms for each switch operate freely Never spray the mower safety switches directly with high pressure water 68 DL Engine Response 68 SL Engine Response Unit Lift 49 ELECTRICAL DIAGRAMS 50 IGNITION SWITCH OFF M ground switch case body BLK FLYWHEEL MAGNETO 1 1 901 Penn 903 1 M 1 1 D 902 1 1 INTERLOCK MODULE c D
52. speed on slopes and in sharp turns to prevent tipping or loss of control Use extreme caution when changing direction on slopes Watch for holes in the terrain and other hidden hazards Do not shift into neutral and coast downhill Use extreme care when mowing near dropoffs or embank ments The mower could roll over if a wheel goes over the edge or if an edge caves in If mower stops going uphill disengage power to the cutting units and slowly back down 5 MAINTENANCE Never store the mower with fuel in the tank inside a building where fumes could reach an open flame or spark Allow the engine to cool before storing in any enclosure Keepthe engine free of grass leaves or excessive grease to reduce a fire hazard Do not change the engine governor settings or overspeed the engine Keep non skid surfaces clean Replace the non skid material if worn damaged or missing Wear appropriate safety gear including safety glasses and gloves while servicing the mower ISO SAFE OPERATING PRACTICES 1 TRAINING Read the instructions carefully Be familiar with the controls and the proper use of the equipment Never allow children or people unfamiliar with these instructions to use the lawnmower Local regulations can restrict the age of the operator 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX Never mow while people especially children or pets are nearby Keep in mind that the operator or user is responsible for
53. ters B in Roller Brackets C Roller D may then be moved up and down It is important to get all rollers adjusted to the same height so that there will be uniform cutting across the entire width of the cutting unit Do not adjust by sight Place the mower on a hard level surface and place a board or gauge plate ofthe desired height under each bed knife back bar Allow the rear roller to rest on the level surface Retighten the adjusting nuts and remove the gauge plate or board 7 d 42 Ip T Ul Li CCG LT N f E 8 STANDARD HEIGHT ADJUSTER NOTE Guards removed or cut away to show detail 680M 06 03 NATIONAL 68 SR amp DL TRIPLEX 2 DIAL A HEIGHT ADJUSTERS OPTIONAL To set the height of cut lift the vinyl cap and socket A off the adjuster tube To raise the height of cut turn the socket clockwise viewed from above To lower the height of cut turn the socket counterclockwise Each quarter turn 90 of the socket will raise or lower the height of cut by approximately 1 32 A full turn 860 will raise or lower the height of cut approximately 1 8 When making large adjustments over 1 2 make small adjustments to each side until the desired change is reached When the desired height is achieved lower the socket and make sure the adjuster tube locks itin position The scale decal C on the rear side of the adjuster indicates the height of cut To use it sight along the bott
54. tions listed inthe Safety Information section of this manual Check the following items before each use of the mower TIRE PRESSURE Use a tire pressure gage to check the tire pressure Fill tires with compressed air as needed to obtain the pressure labelled on the sidewall of the tire ENGINE OIL Check level on dipstick Refer to the engine manual for instructions on adding oil and which oil viscosity to use OPERATION The following is a description of the machine controls and their function A Main Clutch Lever WARNING Engage slowly before full engagement Always disengage the drive when stopping or leaving the machine Engages power for travel and mowing Down position is disengaged and up position is engaged FUEL Check fuel level Add fuel as required Refer to the engine manual for type of fuel and other safety requirements ENGINE COOLING Keep engine cowlings clear of clippings LUBRICATION Add lubricant to pivots and other lubrication points as required Refer to the lubrication chart in the Maintenance section of this manual REELS CLEAR OF DEBRIS Remove any debris that may be tangled in the cutting reels Keep the reel shaft and bearing clean of grass or other debris buildup SAFETY SWITCH OPERATION Check operation of all safety switches Do not use mower if safety switches are disconnected or not operational as dangerous conditions will result The engine clutch lever has
55. vertical position Carefully lower the cutting unit to the ground Avoid dropping the cutting unit as damage may result to the cutting unit the mower or your turf 3 Slip wing Cutting Unit belts B over Countershaft Pulleys 4 Block mower wheels to prevent mower from moving forward Pull Wing Cutting Units D forward so that they slide on Pull Rods E and compress springs F This will allow enough slack to enable belts to be installed over Reel Pulleys G 5 Pull Cutting Units backwards to adjust belt tension Tighten bolt H to lock in place REEL TO BED KNIFE ADJUSTMENT To prevent damage during shipment the reels have been moved away from the bed knives at the factory Follow the procedure for Reel to Bed Knife Adjustment in the Maintenance section of this manual to properly adjust your cutting units ENGINE CAUTION MOWER IS SHIPPED WITH DRY ENGINE DO NOT START ENGINE UNTIL OIL IS ADDED TO CRANKCASE See Engine Manual for additional information DIFFERENTIAL Grease has been installed in the differential at the factory For additional information refer to the Maintenance sec tion of this manual 13 PREPARATION DANGER Handle cutting units carefully with protective gloves Reels and bed knives are very sharp Reels rotate freely and rotating one reel can cause other reels to rotate Moving machinery canbe dangerous CAUTION if not operated properly Follow all safe operating sugges

National Mower 68 DL Lawn Mower User Manual

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