SERVICE MANUAL 76 SERIES DRIVE HEADS Example
Contents
1. 1 5 RING 01 160 0330 01 160 0330 35L 1 SHIFTER SHAFT 71 004 1020 71 004 1020 35M 2 DOWEL 01 152 0070 01 152 0070 35N 1 76 TORSION SPRING STANDARD 01 261 0561 01 261 0561 35N 1 76 TORSION SPRING LIGHT DUTY 01 261 0562 01 261 0562 37 7 1 BAIL ASSEMBLY 37 1_ BAILASSEMBLY 1 1 4 BOSS 71 005 0252 71 005 0252 37 1 BAIL ASSEMBLY 1 1 2 BOSS 71 005 0932 71 005 0932 50 1_ MOTOR PART SPECIFIED BY CUSTOMER X76BA amp 76BC 3690 REV B 06 04 14 HWP Eskridge Inc Olathe KS 913 782 1238 Model 76 service manual SM76_0714 Page 3 www eskridgeinc com Unit Disassembly Procedure 1 Scribe a diagonal line across the outside of the unit from the bail 37 to the bearing carrier 1 before disassembly to aid in the proper positioning of pieces during reassembly 2 To drain oil position unit on its side and remove oil plug 30A located in the top case 3 The oil will drain out faster and more completely if warm NOTE Particular care should be taken when placing the unit in a position for servicing Unit should be blocked up so that weight of the unit is resting on the bearing carrier 1 This fixture must be secure so that the unit will not tip over during disassembly and assembly procedures 3 Remove the twelve hex head capscrews 25A and hex flange nuts 25C Lift bail 37 from unit Replacing two of the capscrews at this point will help keep everything together until t2. ESKRIDGE SERVICE MANUAL 76 SERIES DRIVE HEADS Example Part Number re el GG CG Output Bail Boss Motor Motor Shift Model Ratio Shaft Supplier Number Pressure THIS SERVICE MANUAL IS EFFECTIVE SIN 126302 TO CURRENT NOTE Individual customer specifications may vary from DATE 7 29 2014 TO CURRENT exploded drawing and standard part numbers shown If VERSION SM76 0714 applicable refer to customer drawing for details LUBRICATION MAINTENANCE Using the chart below determine an appropriate lubricant viscosity Use only EP extreme pressure or API GL 5 designated lubricants Change the lubricant after the first 50 hours of operation and at 500 hour intervals thereafter The drive head should be partially disas sembled to inspect gears and bearings at 1000 hour intervals Recommended Ambient and Operating Temperatures for Conventional and Synthetic Gear Lubricants 50 25 0 25 50 75 100 125 150 175 200 225 250 F 80W90 conventional 75W90 conventional 85W140 conventional Min Ambient operating temp Max Ambient temp Max Operating temp 75W90 synthetic 80W140 synthetic 45 32 18 4 10 24 38 52 66 79 93 107 121C Note Ambient temperature is the air temperature measured in the immediate vicinity of the drive head A drive head exposed to the direct rays of the sun or other radiant heat sources will operate at higher temperatures and therefore must be given special consideration The maximum operating temperature m
3. Inspect outer bearing cone 20A and output shaft 2 If ei ther needs replaced a gear puller may be used to remove the outer bearing cone from the shaft If reusing old bearing cone do not pull on or damage roller cage Reassembly Note Press bearing cone onto output shaft by pressing on inner race only Do not press on roller cage or it may damage bearing 1 Press outer bearing 20A onto the shaft 2 until it seats against the shoulder 2 See Unit Assembly for shaft seal installation instructions All subassembly service or repairs should be complete at this time Continue to Unit Assembly to complete unit buildup Unit Assembly Refer to Exploded View Drawing on Page 3 1 When subassemblies are complete the unit is ready to be assembled 2 Place bearing carrier subassembly with output side up site shown on assembly table 3 Apply a layer of lithium or general purpose bearing grease to contact suface of outer bearing cup 20B Place the output shaft 2 assembled with outer bearing cone 20A in bear ing carrier subassembly 4 Lubricate inner lip of shaft seal 16A and slide it onto the output shaft 2 and over the shaft seal diameter Press the seal into the bearing carrier 1 bore Caution Output shaft is not retained 5 this assembly over and rest it on the press table bal anced on the end of the output shaft 2 6 Place retaining ring 5H inside seconda
4. 004 0142 14 1 THRUST RACE 01 112 0030 01 112 0030 16 5 KIT 76 016 2011 76 016 2011 16 1 SEAL 01 405 0540 01 405 0540 168 2 O RING 01 402 0020 01 402 0020 16 1 O RING 01 402 0010 01 402 0010 160 1 O RING SHIFTER SHAFT 01 402 0040 01 402 0040 16 1 O RING 01 402 1013 01 402 1013 20 OUTPUT SHAFT BEARINGS 20A 1 _ BEARING CONE 01 102 0090P 01 102 0090P 208 1 _ BEARING CUP 01 103 0080P 01 103 0080P 200 1 _ BEARING CUP 01 103 0090P 01 103 0090P 25 a HARDWARE 25 12 5 3 8 16 6 1 2 GR5 01 150 0020 01 150 0020 25B 8 SHCS 3 8 16 X 1 1 4 GR8 01 150 0520 01 150 0520 25 12 FLANGE NUT 01 158 0360 01 158 0360 250 2 5 HEAD CAP SCREW 01 150 0560 01 150 0560 25E 2 HHCS 5 8 11 X 1 3 4 01 150 0110 01 150 0110 25G 2 LOCKWASHER 5 8 ZINC PLATED 01 166 0040 01 166 0040 30 i PLUGS AND ZERKS 30A 2 PIPEPLUG 1 2 NPT MAGNETIC 01 207 0010 01 207 0010 35 MISCELLANEOUS 35A 1 5 CYLINDER ASSEMBLY 71 005 0602 71 005 0602 35B 1 RETAINER INTEGRATED CYLINDER 71 004 1018 71 004 1018 35C 1 RETAINING RING 01 160 0110 01 160 0110 350 1 RING 01 160 0100 01 160 0100 35E 1 BEARING 01 100 0040 01 100 0040 35F 1_ SHIFT COLLAR 711 004 0772 711 004 0772 356 1 SHIFTER FORK amp LEVER 71 004 1019 71 004 1019 35H 1 RING 01 160 0040 01 160 0040 35 1 TOP CASE 71 004 0151 71 004 0151 35
5. 5G cannot be removed from second ary carrier 5A without destroying the bearing If the bearing needs replaced the carrier must be replaced as well Reassembly Install bearing 5D and thrust washers 5E into planet gear 5B Thrust washers should be approximately flush with faces of planet gears Install this assembly into carrier 5A Planet shafts 5C should be installed with the chamfered end of the 3 16 inch hole toward the outside diameter of the carrier 5A This will aid in alignment of holes while inserting roll pins 5F Drive roll pin 5F into the carrier 5A hole and into the planet shaft 5C to retain the parts Repeat for remaining planet gears Shifter Gear Subassembly Items 4 35C 35D 35E 35F Disassembly Remove retaining rings 35C 35D and pull pieces apart The bearing 35E may need to be pressed lightly out of the collar 35F Check for worn parts and replace as necessary Reassembly Reassemble in reverse order Top Case Subassembly Items 3 6A 6B 12B 14 16D 25B 30A 35G 35H 35J 35K 35L 35M 35N Disassembly Inspect primary ring gear 12B for abnormal wear or dam aged teeth If replacement is required remove eight socket head capscrews 25B from ring gear Ring gear is doweled into top case 3 Thread two 3 8 16 bolts into threaded holes in ring gear until ring gear is separated from top case Inspect sun gear 6A for abnormal wear or damage If r
6. Inc Olathe KS 913 782 1238 www eskridgeinc com Planet shafts 7C should be installed with chamfered end of 3 16 inch hole toward outside diameter of the carrier 7A This will aid in alignment of holes while inserting roll pins 7F Drive a roll 7F through the carrier 7A hole and into the planet shaft 7C to retain the parts Repeat for other planet gears Secondary Planet Carrier Subassembly Items 5A 5B 5C 5D 5E 5F 5G 5H Disassembly Rotate planet gears 5B to check for abnormal noise or roughness in bearings 5D Inspect edge of carrier 5A spline adjacent to retaining ring 5H This edge should be a sharp corner to ensure that the retaining ring will stay in place If it is worn to a beveled or rounded off corner the carrier should be replaced If further inspection or replace ment is required proceed as follows Drive roll pins 5F completely into the planet shafts 5C Slide planet shafts 5C out of carrier 5A Remove planet gears 5B thrust washers 5E and bear ings 5D from carrier 5A Inspect the planet gear bearings 5D If any need replaced press them out of the planet gears 5B and replace with new bearings Check planet shafts 5C for any abnormal wear es pecially ones where bearings needed to be replaced If any abnormal wear is found replace planet shafts Remove roll pins 5F from planet shafts 5C using a 3 16 inch pin punch Inner bearing cone
7. There machinist s marks on each of the three cluster gears 7B These marks should be aligned so that each points toward the center of the primary planet carrier See diagram above b A special tool should be made to keep the cluster gears 7B aligned properly An old shifter gear 4 cut off just above the gear and welded to a 6 long bolt works well c Align the cluster gears 7B Insert alignment tool Using alignment marks made during disassembly install top case assembly You may need to use the alignment tool to turn the cluster gears until top case 3 is fully seated on ring gear 12A Remove alignment tool Install shifter gear assembly 4 35C 35D 35E 35F by pushing pushing down on shifter lever part of Item 35G using a tool that will not damage its contact surface Place o ring 16E onto shift cylinder assembly 35A Push cylinder assembly into its pilot in the top case 3 and install retainer plate 35B and socket head capscrews 25D Use medium strength thread locking compound blue Loctite or equivalent on the socket head capscrews and torque them to 8 lb ft Install o ring 16C onto hydraulic motor 50 Install hydraulic motor 50 onto top case with two capscrews 25E and lockwashers 25G Torque capscrews to 130 Ib ft Using alingment marks made during disassembly lower bail 37 over hydraulic motor 50 and align with top case 3 Install twelve capscrews 25A and hex flange
8. wood chisel or similar flat strong tool ground flat to insert between the aluminum top case 3 and the ring gear 12A Tap lightly on tool Do not drive into top case Heavy prying will damage the o ring contact surfaces in the top case Remove the top case assembly 3 6A 6B 12B 14 16D 25B 30A 35G 35H 35J 35K 35L 35M 35N Inspect o ring for damage 16B 9 Lift the primary planet carrier subassembly 7 out of the unit 10 If sun gear 7G 7H has not been removed do so now It sometimes sticks to the primary carrier 7A 11 Remove secondary ring gear 12A Inspect o ring 16B for damage 12 The output shaft 2 and secondary planet carrier assembly 5 may now be removed as follows a The secondary planet carrier 5A spline is a press fit onto the output shaft 2 spline Bearing carrier 1 should be set on a plate or table with the output shaft protruding downward through a hole in the table that is large enough for the shaft seal 16A to pass through b Remove retaining ring 5H from end of output shaft 2 NOTE Care should be taken not to damage output shaft or injure your feet when shaft falls out of bearing carrier c Press output shaft 2 out bottom of bearing carrier 1 by applying press load to the top end of the shaft The output shaft shaft seal 16A and outer bearing cone 20A will fall out of bearing carrier 13 Lift secondary planet carrier subassembly 5 out of unit
9. T NUMBER 76BC 1 1 CARRIER 71 004 2144 71 004 2144 2 1 OUTPUT SHAFT 2 1 OUTPUT SHAFT 2 1 2 HEX 71 004 0513 71 004 0513 2 1 OUTPUT SHAFT 2 5 8 HEX 71 004 1383 71 004 1383 3 1_ CASE STD 2 SPEED INTEGRATED SHIFTER 71 004 1014 71 004 1014 4 1_ SHIFTER GEAR 71 004 0562 71 004 0572 5 1 CARRIER ASSEMBLY SECONDARY 71 005 2171 714 005 2171 1 CARRIER SEC 71 004 0073 71 004 0073 5B 3_ PLANET GEAR SEC 71 004 0092 71 004 0092 5C 3 PLANET SHAFT 71 004 0081 71 004 0081 50 3 BEARING 01 105 0020 01 05 0020 5E 6 THRUST WASHER SEC PLANET 71 004 0871 71 004 0871 oF 3 ROLL PIN 01 153 0020 01 153 0020 5G 1 BEARING CONE 01 102 0100P 01 102 0100P 5 1 RETAINING RING EXTERNAL 01 160 0020 01 160 0020 6 2 1_ SUN GEAR ASSEMBLY 741 005 1600 741 005 1610 1 SUN GEAR PRIMARY 7141 004 0172 7141 004 0402 6B 1 BUSHING 014 127 0010 01 127 0010 7 j 1 CARRIER ASSEMBLY PRIMARY 741 005 1691 71 005 1701 1_ CARRIER PRI 71004 0113 71004 0433 7B 3 _ CLUSTERGEAR 71 004 0132 7141 004 0412 7 3 SHAFT PRIMARY 714 004 0121 7141 004 0121 7D 6 BEARING 01 105 0010 0141 105 0010 7E 6 PLANET WASHER 71 004 0861 71 004 0861 3 ROLLPIN 01 153 0020 01 153 0020 7G 1 SUN GEAR SECONDARY 7141 004 0102 7141 004 0102 7H 1 RETAINING RING 01 160 0030 01 160 0030 12 RING GEARS 12 1 GEAR 71 004 0042 71 004 0042 128 1 RINGGEAR 71 004 0142 71
10. The unit is now separated into subassemblies The area s requiring repair or service should be identified by thorough inspection of the parts after they have been cleaned and dried Primary Planet Carrier Subassembly Items 7A 7B 7C 7D 7E 7F Disassembly 1 Rotate cluster gears 7B to check for abnormal noise or roughness in bearings 7D or planet shafts 7C If further inspection or replacement is required proceed as follows 2 Drive roll pins completely into the planet shafts 7 NOTE Support only the carrier 7A while pressing out planet shafts 3 Press or drive planet shafts 7 out of carrier 7A 4 Remove cluster gears 7B thrust washers 7E and bearings 7D from the carrier 7A The cluster gears are a matched set and all three should be replaced if damaged 5 Inspect the cluster gear bearings 7D If any need replaced press them out of the cluster gears 7B and replace with new bearings 6 Check planet shafts 7C for any abnormal wear es pecially ones where bearings needed to be replaced If any abnormal wear is found replace planet shafts 7 Usea3 16inch pin punch to remove roll pins 7F from planet shafts 7C Reassembly 1 Install bearings 7D and thrust washers 7E into cluster gears 7B Thrust washers should be approximately flush with faces of cluster gears Install this assembly into carrier 7A Model 76 service manual SM76_0714 Page 4 Eskridge
11. e placement is required remove retaining ring 35H and thrust race 14 and remove sun gear It is not recommended to remove the shifter mechanism 16D 35G 35K 35L 35N unless an item needs replaced The torsion spring 35N can be difficult to re install once removed If the shifter shaft o ring 16D requires replacement remove the snap ring 35K and carefully slide shifter shaft 35L out of top case just far enough to replace o ring Lubricate new o ring with grease before reinstalling shifter shaft and snap ring Model 76 service manual SM76_0714 Page 5 Eskridge Inc Olathe KS 913 782 1238 www eskridgeinc com Reassembly 1 When replacing primary ring gear 12B always install new dowel pins 35M into ring gear before reassembling Use medium strength thread locking compound blue Loctite or equivalent on the eight socket head capscrews 25B and torque them to 35 lb ft 2 To install a new sun gear 6A place sun gear subassembly 6 into top case Install thrust race 14 and retaining ring 35H Bearing Carrier Subassembly Items 1 20B 20D 30A 1 Inspect inner and outer bearing cups 20D 20B If neces sary they may be removed with a bearing puller 2 Clean all foreign material from magnetic plug 30A Reinstall using pipe thread sealant on plug threads Output Shaft Subassembly Items 2 16A 20A Disassembly 1 Remove the shaft seal 16A for inspection or replacement 2
12. nuts 25C and torque them to 30 lb ft Fill the unit to the proper level as specified with gear oil The drive head is now ready to use Model 76 service manual SM76_0714 Page 7 Eskridge Inc Olathe KS 913 782 1238 www eskridgeinc com
13. op case 3 is removed NOTE There are no bolts retaining the major components to gether proceed with caution when moving the unit 4 Remove the two socket head capscrews 25D that retain the shift cylinder assembly 35A The cylinder assembly will be pushed out of its pocket as the capscrews are removed so it is best to hold the cylinder assembly in place while removing the capscrews Remove cylinder assembly Inspect o ring 16E for damage 5 Remove hex head capscrews 25E lockwashers 256 from the hydraulic motor 50 Notice that the motor is larger on one side It must be replaced in the same position as it was removed Remove motor from unit Check o ring 16C for damage 6 Observe location of shifter fork amp lever 35G shifter gear assembly 4 35C 35D 35E 35F and top case 3 Check for binding or interference by pushing down on shifter lever part of Item 35G to move shifter gear between high and low speeds Use a tool that will not damage the shifter lever contact surface and push it into the hole where the cylinder assembly was mounted 7 Press down on shifter lever part of Item 356 and remove shifter gear assembly 4 35C 35D 35E 35F If entire assembly cannot be removed remove retaining ring 35C and pull collar 35F and bearing 35E off of shifter gear 4 and out of fork part of Item 35G Shifter gear should be free of nicks burrs or gouges 8 If necessary use a screwdriver
14. ry planet carrier as sembly 5 Place this assembly on top of output shaft 2 and line up the carrier 5A spline teeth to the shaft spline teeth N 2 Press secondary planet carrier assembly 5 onto shaft 2 Before it is fully seated install retaining ring 5H onto end of output shaft Fully seat the carrier assembly and check that the retaining ring is fully engaged in shaft groove 8 You may now place this assembly back on the fixture that was used during disassembly with the units weight resting on the bearing carrier 1 9 Install o ring 16B on secondary ring gear 12A You may use grease to help the o ring stick to the ring gear Using alignment marks made during disassembly install secondary ring gear with o ring between it and the bearing carrier 1 Be careful not to pinch o ring 10 Install another o ring 16B on top side of secondary ring gear 12A 11 Making sure retaining ring 7H is installed on secondary sun gear 7G place secondary sun gear in secondary planet car rier assembly 5 12 Install primary carrier assembly 7 onto secondary sun gear 7G by aligning spline in primary carrier 7A to spline on secondary sun gear Model 76 service manual SM76_0714 Page 6 Eskridge Inc Olathe KS 913 782 1238 www eskridgeinc com 13 14 15 16 17 18 19 20 Timing Procedure Caution If unit is not properly timed the gearing will be severely damaged a
15. ust not be exceeded under any circumstances regardless of ambient temperature ESKRIDGE MODEL 76 OIL CAPACITY 6 5 pints 3 06 liters Proper oil level will measure to middle of primary cluster gears when drive head is in the vertical position With the drive head leaning approximately 3 1 2 inches away from the fill plug in the top case about 7 oil will be level with the bottom of the plug hole when full OIL PLUG Uo LEVEL ESKRIDGE PART NUMBER INTERPRETATION Note All non custom Eskridge Geardrives are issued a descriptive part number For a detailed breakdown of this information please refer to Eskridge product specification sheets found at http www eskridgeinc com en us documents product specification sheets WARNING While working on this equipment use safe lifting procedures wear adequate clothing and wear hearing eye and respiratory protection Model 76 service manual SM76_0714 Page 2 Eskridge Inc Olathe KS 913 782 1238 www eskridgeinc com Exploded View Drawing 25E 25G Eskridge amp 76 mo SPEED WITH INTEGRAL SHIFT CYLINDER EFFECTIVE 07 29 14 SN 126302 TO CURRENT PARTS LIST GROUP ITEM DESCRIPTION PART NUMBER 76BA PAR
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