FSD-18A, FSD-21A, FSD-23A Service Manual
Contents
1. 9 11 CAMSHAFT SEAL DRIVER SPINDLE YOKE mn e Ela Els oE E E iy E 8 Nu kok 3 BER 2 E aot Lee 7 utere Captian Larmo CA Ph 46 5800 Fx US 5460 180 07 28 yr tect cm 8 12 CAMSHAFT SEAL DRIVER SPINDLE YOKE 358 872 STEEL MATERIAL BUSHING DRIVER CAMSHAF l utere Corta Larmo CA Ph 825 54600 Fx GE 5460 180 6728 yr tect cm Vi 598 ATNSSSY 1061 ONS MEVUZAIS r AO si Ve uma saz oo aa gt ET vez 114153 onu faut 9 13 STEERABLE END REMOVAL TOOL ou ac 7 TAT GE a YAW TE 5 55 AA ace ol TRUER 12 864 9 13 STEERABLE END REMOVAL TOOL Lomo CA 82 54650 Fx 828 5460 180 07 218 yr teem com TEMI 11150 IES 91 gez 388 O E 11 2 IVAONIE ONS MISVUJJIS Si 6 ne 9 13 STEERABLE END REMOVAL TOOL 8 14 LOWER KINGPIN LOCKNUT TOOL 9 14 LOWER KINGPIN LOCKNUT TOOL USE URREA 10066 1 0 INCH DRIVE 6 POINT 4 125 INCH IMPACT SOCKET OR EQUAL utere Lamo CA Ph 54600 Fx 828 5460 180 67 28 yr te2. NOTES 2 1 RECOMMENDED LUBRICANTS 1 Gear Oil Temperature Grade 0 100 42 75090 GLS 40C to 380 155 to 120F SAEBOW 140 GLS 280 to 49C 2 Chassis Grease Temperature Grado Above 32F 0C MILG 10294 Below 32F 06 MIL G 10294 3 Wheel Bearing Grease Temperature Grade Above 32 06 NLGI Grade 2 Below 32F 06 NLGI Grade 2 22 WHEEL BEARINGS Wheel bearings reque cleaning inspection and packing with grease at each brake reline Wheel bearings should be lubricated in accordance with the vehicle manufacturers recommendations When greasing liberally pack both inner and outer bearings ensuring at the grease has penetrated thoroughly into the cage and roller assembly Prior to reassembly coat the race ways and interior hub surfaces as well 23 UNIVERSAL JOINT Universal joints are lubricated and sealed at the factory and should require no additonal maintenance throughout their service life 24 KINGPIN BEARINGS Kingpin bearings should be lubricated at each chassis lubrication approximately 1 000 mile interval To ensure thorough lubrication the front axl should be raised sighly lo relieve Vehicle weight The lower king pin lube filing ls located at the bottom of the lower kingpin ball Corta Limos CA Ph 25 48 5800 Fx US 5460 180 07 28 yr tect co 3 0 AXLE ADJUSTMENT 7 Install the wheel bearing lock washer and whee bearing adjustment nut then
3. Ok FSD 18A 21A 8 23A STEERABLE DRIVE AXLE SERVICE MANUAL 625 0518 TABLE OF CONTENTS INTRODUCTION General Description 1 1 Operation 12 Operating instructions 13 Specifications 14 Steerable Drive Axle General Dimensions 15 LUBRICATION Recommended Lubricants 21 Wheel Bearings 22 Universal Joints 23 Kingpin Bearings 24 Differential Carriers 25 Steering Tie Rod Ends 26 AXLE ADJUSTMENTS General 3 1 Wheel Bearing Adjustment 32 Kingpin Adjustment 33 Toe in Adjustment 34 Steering Stop Adjustment 35 Camber Adjustment 36 Brake Adjustment 37 STEERABLE DRIVE END DISASSEMBLY General Precautions for Disassembly MA Brake Drum Hub and Wheel Bearings 42 Brake and Wheel Spindle 43 Spindle Yoke Removal 44 CLEANING AND INSPECTION Choice of Cleaning Methods si Drying and Corrosion Inhibition 52 Inspection 53 STEERABLE DRIVE END ASSEMBLY General Precautions for Assembly 61 Spindle Installation 62 Brake Equipment 63 Wheel Bearings Hub and Brake Drum 64 TABLE OF CONTENTS ADDITIONAL SERVICE PROCEDURES Steerable Drive End Removal 74 Differential Carrier Removal 72 TORQUE SCIFICATIONS SPECIAL TOOLS Wheel End Inner Seal Driver ai Wheel Hub Seal Driver 82 Lower Kingpin Seal Driver 93 Lower Kingpin Bearing Driver 94 Upper Kingpin Seal Driver 85 Upper Kingpin Bearing Driver 26 Inner Axle Seal Driver 97 Upper Kingpin Ball Stud Puller 98 Camshaft Seal Driver Brake Bracke
4. 5 Install the inner washer and slack adjuster over the S camshaft with the 7116 adjusting screw pointing toward the front of the ado Begin by placing wo 60 and two 030 spacers over the end of the S camshalt Install the snap ring See Figure 27 Figure 27 6 Tap on tho cam end of the shaft with a soft mallet to move the shalt inboard Attempt to inser a 030 spacer between the existing spacers and the snap ring It the spacer sides easily between the Iwo remove the snap rng and install he spacer Reinstal the snap ring and repeat this step until a 030 pacer can no longer be inserted 7 Thread the air chamber push rod into the clevis until it bottoms out Then back of two turns and torque locknut to 75 5 8 8 Hook the two lower retaining springs into each brako shoe By grasping the shoes al the top and spreading them apart the circular recess in the bottom al each shoe can be fit over the anchoring pin on the spindle yoke Install the large upper brake release spring Then using a bar pry the shoes away from the S cam and Insert he cam Shall rollers See Figure 28 06098 ne soe AN E SCA 11 Reinstall the e rod end torque the caste malto 100 Ina and 8 a new cotter pin 6 3 BRAKE EQUIPMENT 1 I necessary press new seals and bushings inta the air chamber mounting bracket and spindle yoke Seals must be installed flush so that the lp side wih spring of both seals faco to ward the slack
5. screw is tuned out See Figure 4 Figure 4 Begin tightening the adjusting screw and continue until upward motion of the staerable ond stops la finger is placed near the gap between tho suspension and spindle yokes the point at which up ward travel stops can bo readily fol Additional resistance wl also be felt in the effort required to tum the adjusting screw The upper kingpin has now been seated in ils bushing 5 Pace a stack ol feeler gages ar in the gap between the suspension and spindle yokes in Io area of the lower king pin bal stud The gages or deft should ft snugly Filing the gap No measurement is necessary See Figur 5 Fon Ate 48600 Fax 988 5490 1400267 35 STEERING STOP ADJUSTMENT The steering stop adjustment is made at the factory There should be no need to alter il unless a major component such as the axle housing or spindle yoke has been replaced for some reason The turn angle is set at 35 and this can be checked with a carpenter s power saw protractor on the wheels inside rim and a T squaro laid along the frama ral with the vehicle s steering at full lock If an adjustment is necessary loosen the steering stop 12 point adjusting screw an the rear of the spindle yoke and add or remove washers lo achieve desired tum angle Torque the jam nut to 75 The 1ge in adjustmen Section 34 should bo completed before performing this procedure RASSE 80 8 Ar
6. LEAST ier BEFORE THE 3 6 CAMBER ADJUSTMENT Castor 6 specified by the vehicle manutacturor and can be adjusted only by means of shims between the axle spring seat and the spring Changing the caster wil change the pinion angle and may affect the operation of the front drive shat 36 BRAKE ADJUSTMENT After an inital setup proceduro brako adjustment is made automatically by the slack adusters and should require no attention between reines To adjust the slack after a brako rane 1 Using a 7 16 socket rotate the hex extension on the front of the slack adjuster clockwise until the shoes first contact the drum See Figure 8 Rotate the hex extension 1 2 turn counter clockwise 1o back off the shoes and provide iniial running clearance A ratcheting noise while backing off 5 normal 34 TOEN ADJUSTMENT lt is not recommended to raise the fron of the truck lo check toon at the factory Ino setting is made with the axle loaded lo simulate actual operating conditions An expandable loedn alignment bar is recommended but if unavailable consult an alignment specialist Since the FSD 18A 21A and 23A axes use an off set tie rod tube adjustment is not made by Turning the tube 1 sel but rathar by rotating a Small adjuster located at the left or right end ol the le rod tubo See Figure 7 It is critical to making the adjustment accurately tat tho front wheels are as close lo Straight ahead as possible Loosen the lie rod adjust
7. the inner wheel bearing cocking upon installation of the hub 2 Grasping the outer cicumferonco of the hub at the 12 and 6 oclock positions push the hub straight on to the spindle l dificuly is encountered try rocking ho hub slightly to free the inner bearing Once the hub is in position the outer bearing and adjusting nut can bo stalled Refer to Section 32 for whe bearing adjustment 7 0 ADDITIONAL SERVICE PROCEDURES 7 1 STEERABLE DRIVE END REMOVAL he same time the brake bracket will be ited back of the staering arm or upper This procedure 8 useful in cases where itis kingpin cap necessary to gain access lo the inner axle seal or to remove the differential yet complete lear 5 Remove the steering arm or upper down ol the steerable end is nol desirable kingpin cap dificuli is encountered Removal of the steerable end wil be greatly tum the adjusting screw back in lo foros faciltated if acquistion or fabrication of the the arm or cap off the studs special mounting tol is possible The steerable fend removal tool is availabe from Fabeo or it 6 Attach the steerable end removal tool lo can be fabricated from the drawings In Section A transmission jack and mount it to the 9 13 Special Tools staerable end by means of the lowest free wheel studs and nuts Thread the 1 Remove the cotter pins from both tie rod 314 16 x 5 bol up through the bottom ends Unscrew both castle nuts so that al the base plate and into th
8. AN E AS ve 9 5 UPPER KINGPIN SEAL DRIVER 2 6 UPPER KINGPIN BEARING DRIVER Bo n 8 m gee a 35 u 8 BRE Bo SN dm i E a B rod e E KINGPIN ER 1 21 50 de UPF utere Captian Lomo CA Ph S 4900 Fa US 44901 180 67 tt ce 9 7 INNER AXLE SEAL DRIVER r s an STE 917 MATERTAL LE SEAL DRIVER 0 AX INNER 9 utere Corta Limo CA Ph S 4900 Fa US 5460 1 66 67 28 ya tect com Fes utere Caran Lomo CA 825 48600 Fa 8 GALS TIVA NIdONIM 3 01 6 aI 666 GL DEI X CO 5625 LAKONA Com 209 25 5 2006 8 DI 73 DAY Y 72 5 EH ENS ETI 10k RN OY F2 x 2X 580168 BT TE TF CE E 0000003 ANS E LOG gir Xar uz Thi 998 9 8 UPPER KINGPIN BALL STUD PULLER 9 9 CAMSHAFT SEAL DRIVER BRAKE BRACKET o zi e 8 E 5 ip Y FO a 8 i g 3 3 a a 8 Boom IN lo HL i o gt 3 mi E an la Ban 0 m E 2 lo jo utere Cartan Larmo CA Ph 825 46 5800 Fx US 5460 180 07 28 yr tect con 9 10 CAMSHAFT BUSHING DRIVER BRAKE BRACKET STEE 359 84 VER MATERTA BUSHING DR CAM 9 18
9. Figure 2 utere Caran Lomo CA 82 82600 Fx 828 5460 180 67 28 tt co 6 Advance the lower kingpin ball stud until the feeler gage stack or dit loosens So Section Special Tools 9 15 This indicates that the bal stud threads are actually beginning lo spread the Suspension and spin le yokes apart Soe Figure 6 Figure 7 Back off the ball stud enough to al low the closest hole in the lower kingpin lack washer to engage the retaining dowel pin Apply grease lo the surfaco of lower kingpin lock washer that wil face the locknut This helps keep the washer from tuming when tho locknut is tightened Torque the locknut to 2 000 1811 Soo Section Special Tools 9 14 Back out the upper kingpin adjusting screw just nough lo relieve pressure so the end can turn feely approximately 1 16 turn and torque jam nut to 75 bt 3 3 KINGPIN ADJUSTMENT 1 The front of the vehicle should be raised property supported and he front wheels removed from the axe 2 Loosen the lower king pin locknut see Section 9 14 Special Tools and back i down enough lo allow tho lower king pin lock washer to disengage from ils retaining dowel pin Remove Ino grease iting Back the lower king pin ball std see Section 9 15 Special Tools down four complete turns 3 Loosen the upper king pin adjustment jam nut and back out ihe adjusting Screw four full turns The drive end assembly wil begin to lower as the
10. adjuster ond of the bracket Improperly oriented seals may allow grease to exi the cam shalt head ond and contaminate the brake linings 2 Push the S camshalt al the way into the mounting bracket from the wheel sido unti the cam head contacts the bracket push the camshaft tubo onto the shall Make sure that the O rings are set Inthe grooves on the camshaft tube BEE or 3 Push the air chamber mounting bracket onto the S camshaft Then align the bracket on the steering arm or upper kingpin cap Insert the two 78 bolts and Torque to 250 lb ft 4 Fit the air chamber mounting studs through their 685 in the bracket and secure with the two 58 locknuts and washers Torque to 150 lb ft Soo Figure 26 Figure 26 3 Install dive flange aver ho drive stude Install the drive flange locknuts and torque to 175 Iba using a uniformed torque sequence 4 Mount the brake drum over the wheel studs 5 Grease all lubrication points before returning the vehicle to service NOTES 9 Refer to Section 38 for brake adjustment 6 4 WHEEL BEARINGS HUBS AND BRAKE DRUM 1 Press both whee bearing cups into the hub Thoroughly pack both bearing canes with grease and coal the inside surfaces of the hub and bearing cups Install the Inner wheel bearing cane and the hub seal in the hub See Figure 29 Lighly coat the outer surface of the spindle wih grease to reduce the chance of
11. ct co Fon Atos Corta Larmo CA Ph t 5460 Fa 918 64450 1801 067 6 3001 0 15 TIVA NIdONIM 6 SIN avr DAL HLIA MIROS do HE 47 OND BISTE BU 385 GVI HH kE ONT 21 5176 7 1 SALIVNUBLT rues HH vane 4320 192 13008 DUNONSIS 192 AL NO v Jon DNOT 2045 9 15 LOWER KINGPIN BALL STUD REMOVAL TOOL 8 16 HUB BEARING LOCKNUT TOOL USE EITHER OF THE FOLLOWING 5 POINT SOCKETS 9 16 HUB BEARING LOCKNUT TOOL SNAP ON ANS 1915A 4 1 8 OTC 1915 4 1 8 utere Lamo CA Pe 4900 Fx US 5460 1 66 67 28 yr tect com NOTES
12. dois 981335 Ste SL 7A Sly ROWS SIMIVA JO OL NI KIUN 38 011915 Guy 3666673880 AKO MLAN SETS MI anuo T 0005 000 056 m 065 914335 8 Iv 8 0 TORQUE SPECIFICATIONS 90 SPECIAL TOOLS 9 1 GENERAL Service tools may be manufactured to these drawings or Fabco Automotive may be contacted for pricing and availabilty The manufacture of these tools should be carried out by professional machinists and certified welders following typical and good workmanship procedures and safe practices Foca Atos Corta Larmo CA Ph S 54650 Fax e 64450 1400 57 1935 HANNI ONJ TH3HA 0 944 WHEEL END INNER SEAL DRIVER 9 2 WHEEL HUB SEAL DRIVER EEL 252 B82 MATERIAL DRIVER I E 8 SE lU WHEEL N 9 Atom Corta Larmo CA ph 5460 Fx 828 5460 180 67 28 yo tect cm 9 3 LOWER KINGPIN SEAL DRIVER RIAL STEEL MATES 52 j 4 LOWER KING e 9 9 4 LOWER KINGPIN BEARING DRIVER 358 918 AL STEEL VER ji MATER BEARINC DR 52 20 GRIN 9 4 LOWER KIN Alo Corto Limo CA Pi 825 54969 Fax 888 56960 MOI SE AE yon Foca Autoras Corta Larmo CA S 54650 Fx 698 64450 180 57 via 252 HJATHO WAS 1 Hdd 6 1 HERD unii dA L
13. e nut only a few threads remain in furthest from the vertical plato Adjust engagement Use a suitable puller 5 he bol to contact and support the brake extract the tle rod end from the drum suspension yoke Do nol strike tho tio fod end bal stud Completely remove VIE TORE E IST WARE he nuts and tie rod END MUST ME FOUND FEFORE cONIMUNG 5 2 Remove all eight 12 paint cap screws which secure the universal jolnt to the 7 Loosen the lower kingpin locknut see axle shaft and yoke shaft Pry the joint Section 9 14 Special Tools and away from the shafts and remove See completely remove the locknut lock Figure 20 washer and lower kingpin bal stud s Section 9 15 Special Tools from the spindle yoke 8 Remove the 1 14 upper king pin bot Special tool number 866 0744 see Section 9 8 shauld now be used to pull the upper kingpin ball stud trom tho suspension yoke Using the upper kingpin bal sud puller fit one tube over the locating dowel and the other is allowed to float freely Insert the 1 118 12 x 3 1 2 UNF bolt through the spacer and the tools centra hole The 591 Should then be threaded inta the top of the upper kingpin ball stud Tighten the 3 Loosen the upper kingpin adjusting bolt unt the bal stud is pulled free from Screw jam nul and Back out the the suspension yoke adjusting screw until the spindle yoke stops moving downward and is resting 8 Roll the jack backward to disengage the onthe suspensio
14. er and tie rod lame Figure 1 Which ever end the 9 rod adjuster is located toe in is increased by unscrowing tho adjuster from the tle rod liso The correct setting is 0 8 loc in in the case of a vehicle with fulme fourwhesl drive proportioning differen ial the setting reverts to 0 1 8 126 0 1 greater distanco in the front than the roar Consult a tire specialist for a speciic recommendation if Specialized tres aro used 2 Tighten both clamp bolis to 75 Ib Roll the vehicle forward a distance equal o four rotations of the wheels taking care lo maintain their straight ahead alignment Recheck the toe in and repeat this procedure if necessary lo obtain the correct dimension utere Caran Lomo CA 828 48 5880 Fx GE 5460 180 67 28 yo tect com Figures 2 Confirm that the drum rotates freely Scraping noises are OK but no heavy drag should exist lf excessive tition ls present continue to back off the hex extension in 1 8 lum increments unti ree motion is restored 8056 muma 657886 Tan ONE THAT WT ME ADJUSTER ML REMOVE ERARA SLAG NOTES utere Corta Larmo CA Ph 46 9800 Fx GE 65460 1 86 07 28 yr tect con 4 0 STEERABLE DRIVE END DISASSEMBLY 4 1 GENERAL PRECAUTION FOR DISASSEMBLY EE ea TEVI o Lor STATE nena RAKE snot 1 Follow each procedure closely in each R k ANN G ae section making use of both t
15. es the 3 6 damaging the mer seal py Les of bar or so hammer may be against tho only o imer 6 6 fearing romans on the spindle when the hub is removed use sul aba 42 BRAKE DRUM HUB AND WHEEL puler 10 remove I bung only against BEARINGS Fe Bearings race lap a 68 tho aces outboard surface Min 1 Raise the ront of the vil wth a ack Smal dr to cored ls misalgnment and secre wth ack etande of suka And again atom to remove by hand Capacity Also remove the front wheels 2 Remove the brake drums Figure 12 3 Next remove the push rod from the slack adjuster clevis by loosening the lcknut Ses Figure 13 Figure 13 4 To remove the S camshalt pry the retaining snap ring located on the slack Adjuster end ofthe S camsha out of ils groove than pull the S camshalt out of the air chamber mounting brackal AL the same lime remove the shims slack aduster and ihe washer located between the slack adjuster and air chamber bracket 5 To remove the brake shoes detach the op retaining spring from tho lower shoe Then with shoe in hand lower down lo detach tho release springs at the anchor pins Now the other brake shoe is roe lo be removed Figure 10 7 Wheel bearing cups may be removed from the hub using a sult able puller Pull the cup out evenly 4 3 BRAKE AND WHEEL SPINDLE 1 Removal of the brake shoes wil be faciltaled by turing out me 7 18 adjustment
16. eter Single Reductlon Ratios Universal Joint Steering Ackerman to Match Whaolbasos Dual Steering Arms Kingpins Type Spherical Nyatron Races incinaton ES Track 95 0 nch Over Wheel Mounts Standard Tum Angle Type as Lubrication Type SAE 75 90 80W 140 GLS Weight Dry 11008 1 5 STEERABLE DRIVE AXLE GENERAL DIMENSIONS E I 2 0 LUBRICATION stud itself The upper Kingpin fiing is on the Stoering arm or upper kingpin cap 25 DIFFERENTIAL CARRIERS Diferental carrlers should have the lubricant changed at the same interval as the rear axle on the vehicle or approximately 10 000 mies Drain while lubricant is warm and clean the magnetic drain plug Removal ofthe fil plug will allow quicker drainage Be sure to alow the housing to drain completely Reinstall the drain plug and fil the housing lo the bottom of the 1 lug with the appropriate gear el Check for leaks SAE 140 gear oll meeting MIL L 2105 B 6 appropriate for most operating conditions For extreme conditions follow the vehicle manufacturers recommendations for the rear axle and apply them to tho front axle 26 STEERING TIE ROD ENDS Tie rod ends should be lubricated every 1 000 miles at each chassis lubrication Inspect for loose bent or other wise damaged components Careful attention lo such deal is a vital safety factor
17. ext and id sive Fai figures 4 The dive ange should be loose 8 The outside of unk shoud be enough to remove by hand lf it is no caen cleaned belore staring use two 2 2 bolts in the extractor E Wo 12 20 ba in ho extacor does rovi lr s purpose S4 Eisen EE cand 5 5 8 3 Propare a clean place to work important mat no dirt or foreign material be allowed to enter the unit during repairs 4 Rotor lo the exploded views located in the paris manual as an aid in disassembly 5 When disassembling the various assemblies lay all paris on a clean bench in ihe same sequence as removed This procedure wil simply Teassonbl and fedoce he possibly of 6 Remove ihe wheel beat loka koso par washer and adus nut tom h Spine Rock Ine hub in placo 1 loosen 6 Carly wash ang robtvcate al tho outer wheel bearing cone Remove Bearings as removed and proletoj the cone and wrap prets wrap unii ready tor use Romo beans Man 665206 tor 6 Remove the hub inilaly a tmpting to purpose or in a manner which wil not pul the assembly straight of to avid Gamage 69 bearings What wil be he mer 63 09 cone See Figuro 10 l the cone nds against he pide y rocking the hu o fee bu 7 When necessary 10 apply force 10 i may ba necessary to use a py bar remove pa the uza d a puler or under the iner surface ol the hub To press is preferred In somo cas
18. gure 17 Fi one tube over the locating dowel and the other is allowed to float freely Insert the 1 1 8 12 bolt through the spacer and te tools centra hole The 591 should then be threaded into the top of the upper kingpin ball stud Tighlen the 68 unti the ball stud is pulled tree ol the suspension yoke 6 Remove the two 8 8 air chamber mounting nuls and washers to detach the chamber from the mounting bracket The mounting bracket itself can be with drawn from the spindle yoke following removal of its two 7 8 mounting bolts 7 Remove the ten 34 sell locking nuts which secure the spindle A litio suasion with a soll mallet may be necessary to free up these components See Figure 14 Figure 4 4 4 SPINDLE YOKE REMOVAL 1 Due to is high torque loosening the 4 118 lower kingpin locknut see Section 9 14 Special Tools wil require Substantial leverage Remove ihe grease fitting from the lower kingpin ball lud Now the ball stud can be removed So Section 9 15 Special Tools See Figure 15 Figure 15 2 Remove the cotter pins from both tie rod fends Unscrew bath castle nuts so that Fen Atomo Lomo CA 825 54450 Fax SE 54960 120 86 ino upper kingpin bearing from the spindle yoke unless it has been determined that replacement is necessary The upper bearing may be diven out by the bottom of 5 in side edge using a chisel or di Figure 19 NOTES Remove the
19. ingpin seals must be Installed in thar bores wigrease Figure 24 7 Smear the spherical porton o the lower kingpin bal stud with grease Screw the lower kingpin ball stud into the spindle yoke Ensure that the locating pin forthe kingpin lock washer is in position in the yoke then loosely instal the lock washer and 6 After wiping both mounting surfaces clean of grease push the steering arm or upper kingpin cap down over 5 mounting studs and plat dowel instal he two 3 4 nuts and torque lo 250 Ib Tt instal the upper kingpin adjusting screw lis jam nut and the lubrication ing in he cap or arm 8 Completo steps 47 of Section 32 Kingpin Adjustment in this manual 10 instal the spindle over tho yoke shaft and spindle yoke studs Soo Figure 25 Torque the spindle nuts to 250 Ib using a uniforme torque sequence mr Figure 25 Figure 22 5 Placo the spindle yoke on the suspension yoke optimally with some ting device See Figure 23 instal the upper kingpin ball stud and boli l is recommended to replace the bot with a new one from Fabco If a replacement bol is not available use the existing bolt and apply Locito 272 to its threads during assembly Torque the bol to 1 000 8 8 Figure 23 6 Reinstal the yoke shati bearing if removed making sure it is packed lberaly with grease Seo Figure 24 Replace the thrust washer and snap tino
20. joints The yoke shafts get ther power trom ihe U joints and transfer it by means of spines to the drive flanges which are bolted to the wheel hubs thus rotating the 666 When steared the outer section of each steerable dive end rotates about the kingpin center line The U joint centered on tho kingpin centerline allows power to be Atom Corta armee CA Ph 25 5460 Fx GE 5460 180 07 28 yr tect co 1 4 STEERABLE DRIVE AXLE SPECIFICATIONS FABCO MODEL FSD 18A 21A amp 23A The Fabco Model FSD 23A Steerable Drive Axle is an exposed Cardan joint design developed for use fon highway with rough terrain capabilly This is a low profile axle which packages similar to a hub reduction design but is of North American design and manulacture The axle ullizes the decades proven Fabco design philosophy of light weight and strong fabricated steel design spherical king pins for excalient steering performance and easy maintenance Nominal Capacity 18 000 21 000 amp 23 0004 Brakes Type Drum Scam Size 16 5 Diameter x 7 Inch Chamber 00 Certification FMVSS 121 Stack Adjuster Automatic Gunite Standard Housing Fabricated Steel Cast Banjo Center Bowl Camber 1 2 Postive Wheels Mounting 10 Studs on 285 75 mm Hub Piloted Standard 20 neh 14 5 nch Hypold 33 373 410 456 4 88 513 5 71 6 33 Single Cardan Permanently Lubricated Minimum Wheel Size Differential Carrier Ring Gear Diam
21. l Seo Figure 22 Grease light all seal lips and kingpin bearings Ralnsta the drive axle shalt assembles being careful not to score the Inner axle seal a 6 1 GENERAL PRECAUTIONS FOR ASSEMBLY 1 Assembly Reler to the exploded views located in the parts manual as an aid lo assembly 2 Inia Lubrication Splines and grease seal lips should be coated and 196 with grease prior lo reassembly to provide lubrication upon star up 3 Bearings Use of flanged end bearing drivers is recommended for the instalalion of bearings and races These divers only apply force to the races of the bearing preventing damage and maintaining alignment with the shaft and boro 4 Seale Use a flanged type guide or driver to instal seals l a diver is not available use of a soft hammer andior wood blacks may be made provided that care is exercised Proprietary divers are avaliable dhecty from Fabco and drawings are also provided in Section 9 6 2 SPINDLE INSTALLATION 1 tthe inner axle seal has been removed smear grease on the inner bushing surface of the replacement part and apply a thin bead of Loctite gasket eliminator to the outer surface Drive i into the suspension yoke unti it seats squarely against the shoulder of the bore FAS AR PASSAGE wach SHOULD BE LOCATED 2 Placo the lower kingpin plato in tho suspension yoke and dre in the bearing and seal after lt See Figure 20 Both upper and lower k
22. mulsion cleaners or petroleum solvents Alkaline hat solution lanis may damage tne machined surfaces and should be avoided 5 2 DRYING AND CORROSION INHIBITION Soft clean shop towels should be used to diy paris after cleaning Compressed air may be Used lo clean accessible areas of larga paris such as the housing Bearings should not be spun dry with compressed air as the lack ol lubrication may cause damage lo the mating surfaces Dry paris should be immediately coated with a light oi or a corrosion inhibitor to prevent corrosion damage Parts which are to bo stored should also be wrapped in heavy waxed paper 53 INSPECTION Prior to reassembly parts which are to be re used must be care luly inspected for signs of wear or damage Replacement of such parts can prevent costly down time at a future date All bearing and bushing surfaces including roller bearing cups and conos should be examined for piling wear or over heating Shafts may be nicked and marred or have damaged leads Inspect al structural members and welds closely for any signs of cracking Parts which 6 0 STEERABLE DRIVE END ASSEMBLY lips facing outward I the upper kingpin bearing has been removed instal the new pari using either a pusher plate or the old part as a driver See Figure 21 If necessary install a new upper kingpin seal against is shoulder opposite the upper kingpin bearing Figure 21 lf necessary install a new wheel end Inner sea
23. n yoke siserabla end from the axe See Figura EFC 4 Remove the steering arm or upper kingpin cap nuts along with the brako bracket bolis Using a 7 16 socket folate the hex extension on the front of the slack adjuster counterclockwise At Atomo Caran armes CA 885 45 5800 Fx SIS 5460 180 67 28 tt com RETE RETIR O AE B T ce WAT OR FORMATION REGATO 4 instalation is the reverse of removal Apply a bead of Loctite gasket fliminator lango sealant 4515 or equivalent around the diferenta carrer mounting face on the ado housing See Section 8 0 for correct torque values 5 Clean the magnetic drain plug and fill the axo to the bottom edge of the level hole with tho appropriate lubricant NOTES 10 Installation is the reverse of removal Ses Secon 8 0 for correct torque specications After assembly complete the kingpin adjustment proceduro Soction 3 3 and grease upper and lower kingpins 7 2 DIFFERENTIAL CARRIER REMOVAL 1 Remove the oi drain and fill plugs from he diferenial housing to drain lubricant 2 Remove the lie rod and bath steerable ends as described in Section 7 1 With draw both axle shalts rom the axle EEUTGR EWEHRETUUPFORT YREDWTERERTT 285 MUST BE FOUNO BEFORE CON TS 3 Remove all differential mounting bolis washers and nuts Roll me dierertial carter away from the axe saviaa 1108
24. screw on Ihe slack adjuster to relieve tension on the S cam rollers See Figure 11 Turn tho screw counter clockwise untii the rolers rest at the lowest point on the cam Figure 11 2 Insert a suitable pry bar down between the lap of the brake shoe and a spindle Iacknbt Pry the shoe away from the 5 cam and remove the roller Relax the spring tension ten remove the opposite roll im Ike fashion See Figure 12 only a few treads remain in engagement Use a sullable puller 5 extract he lla rod end from the suspension yoke Completely remove the nuts and lie rod Was US WOT STRIKE TRE TETOJ ER BATI 3 Loosen the upper kingpin adjusting screw jam nut and back out the adjusting screw unll the spindle yoke stops moving downward and is resting fon the suspension yoke Remove the 6 7 8 steering arm or upper kingpin cap locknuts and boli Than pull the leering arm or cap up and ol the mounting studs and locating dowel li ificuly is encountered tum the adjusting screw back in to force the arm or cap ol the studs See Figure 16 Figure 16 4 Remove the drive yoke bearing retaining snap ring and thrust washer The yoke shalt bearing removal is optional Remember to repack the bearing upon instalation 5 Remove the 1 14 upper kingpin boit Special tool number 866 0744 ses Section 8 8 Special Tools should now be used to pull the upper kingpin bali stud from the suspension yoke Soo Fi
25. t 39 Camshaft Bushing Driver Brake Brackel 8 10 Camshaft Seal Driver Spindle Yoke an Camshaft Bushing Driver Spindle Yoke 912 Steerable End Removal Tool 913 Lower Kingpin Locknut Tool 9 14 Lower Kingpin Ball Stud Removal Tool 8 15 Hub Bearing Lock Nut Tool 5 15 ILLUSTRATED PARTS AND LIST INTRODUCTION transmitted through out the possible range ol steering in puts The axle is equipped with Scam air brakes and automatic slack adjusters 1 3 OPERATING INSTRUCTIONS In conditions where the vehicles rear wheels might spin such as sand loose dit mud Snow ice or ascending grades the front drive axle can be shifted into operation for improved Waclon Engagement can bo mado at any Vehicle speed pro vided that the rear wheels are not spinning Engagement is 651 accomplished when the engine is puling light NOTES 1 1 GENERAL DESCRIPTION The Fabco Steerable Drive Axle consists of four major assemblies the axe housing two steerable drive ends and a differential carior A sieerng 16 rod links me right and lefi stgerable ends and steering in put is delivered via a steering arm Tho steering am 5 usualy located on the left steerable end although right hand or even dual steering arms are avallable 4 2 OPERATION Driving forces are put into the axi at tho pinion yoko on the diflerential carrier they pass through the diferental to the inner axle shafts and on to the universal
26. tool grasp the spindle yoke firmly and disengage it from the suspension yoke An overhoad crane would make this procedure a lot easler Figure 17 OUR RAE SPINDLE 6 Remove the drive and axe shaft assemblies by sliding them out of the axle housing being very careful not lo Score the inner axe seal See Figure 18 No need lo take this assembly apart unless replacing the cross and bearing Figure i 7 Remove the lower kingpin bearing and seal from the suspension yoke by Inserting a 7 8 or smaler flal haaded bar through the upper kingpin bolt hole a it contacts the lower kingpin plate See Figure 19 Strike tha top of the bar do drive out the bearing Do not remove 5 0 STEERABLE DRIVE END DISASSEMBLY show any sign of damage should be repaired or replaced NOTES 5 1 CHOICE OF CLEANING MEATHODS 1 Steam may be used for external cleaning of completely assembled units Care must be taken lo ensure that water is 61 out ol the assembly by 19017 losing breather caps and other openings 2 Rough parts such as housings which are 1oo large to conveniently clean with Solvents may bo immersed in a hot solution tank containing a mild alkaline Solution Parte cleaned in hot solution tanks must be rinsed thoroughly lo prevent damage by traces of alkaline material 3 Paris with ground or polished surlaces such as bearings or shafts should be leaned with e
27. torque locknut to 400 Ib tt See Section Special Tools 9 16 Next ono tab on the lock washer should be bent inward and one bent outward across the lal dest part ol the nut 8 The wheel bearing end play should be checked with a dial indicator as part of the adjustment procedure Seo Figure 3 The correct ond play sting is no less han 002 and no more than 004 8 Reinstall tho divo flange over the hub assembly Then torque the drive flange ta 175 i e 3 1 GENERAL Adjustments may be necessary after an accident in response to or to correct steering problems tire wear problems or as part of the reassembly process altar a thorough Inspection 3 2 WHEEL BEARING ADJUSTMENT 1 The front of the vehicle should be raised property supported and he front wheels removed from the axle 2 Then remove the brake drum 3 Remove tho eight 5 8 outer div tange Jocknuts 4 The dive flange should bo loose enough to remove by hand I 1 is nol use tuo 1 2720 bolis in the extractor holas provided for this purpose See Figure 1 5 Remove the wheel bearing locknul and washer from the spindle and loosen the bearing adjusting nu 6 Torque the bearing adjusting nut to 50 5 while simultaneously rotating the hub assembly See Section Special Tools 9 16 Loosen the nut and repeat this procedure 23 times to ensure thal the bearings are seated properly After the final tightening back off the nut 1 4 tur See
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