Wheel horse tractors unidrive transmission repair service ma

MECHANICAL TRANSMISSION REPAIR MANUAL WHEELHORSE L lawn & garden tctors Price $3.50 www-MyWheelHorse-com

FOREWORD This service and repair manual has been compiled to provide authorized Wheel Horse service personnel with the proper procedures and techniques for servicing Wheel Horse mechanical transmissions. The following index lists all areas covered. It is advisable to read all of the introductory sections ﬁrst to gain a proper understanding of the Wheel Horse mechanical transmission used in each model. The transmission is a sophisticated piece of machinery. Maintain strict cleanliness control during all stages of service and repair. Even a small amount of dirt or other contamination can severely damage the components. Product information and specifications are shown herein as of the time of printing. Wheel Horse Products. Inc. reserves the right to change product specifications. designs and standard equipment without notice and without incurring obligation. www-MyWheelHorse-com

CONTENTS Page TRANSMISSION USAGE ART ...... . SECTION I 5003 • 5010 TRANSMISSIONS 5-14 Removal . . .. . . . . . . . . . .. . . . . . . . . . . . 5 Installation . . . . ... .. . . . . . .. . . . . . . . . 5 Disassembly . . . . . .. . . . . . . . . . . . . . . . . 6-8 Cleaning, Inspection, Bearing and Oil Seal Replacement . . . . . . . . . . . . . . 8 Assembly .. . . . . . . ... . . . . . . . . . . . . . . 8-9 DIFFERENTIAL OVERHAUL . . . . . . . . . . .. . . 10-11 Disassembly . . . . . . . . . • . . . . . . . . . . . . . Cleaning, Inspection, Parts Replacement Assembly . . .. . . . . . . . . ... . . . . . .. . . . 53 AND 5010 SERVICE NOTES . .. . . . . . . EXPLODED VIEW . . .. . ... . ...... . .. ... . 10 10 11 12 13 PARTS LIST . . . . . . .. . . . . . . . . . .. .. .. .. . 14 SECTION I I 5053 • 5058 3·SPEED UNIDRIVE 1 5-26 Description . . . . . . . . . . .. . .. . . . . . .. . . 15 Removal . . . ... . . . . . . . . . . ... . . . . . . . 15 Replacement . . . . . . . . . . . . . . . . . . . . . . . 16-17 Disassembly . .. . . . . . . . . . . ... . . .. .. . 16-18 Cleaning, Inspection, Bearing and Oil Seal Rep lacement . . . . . .. . . . . . . . 18 Assembly . . . . . . . . . . .. . . . . . . . . . . . . . 1 9-20 Assembly of 5058 Series with Bevel Gear Differential . . . . . . . . . . . . 21 DIFFERENTIAL OVERHAUL . . . .. . . . . .. . . . 21-22 Dissassembly (Standard Differentia l) . . .. 21 Assembly (Standard Differentia l) . . .. . . 22 Disassembly (Bevel Gear Differential) . . 22 Assembly (Bevel Gear Differential) . . .. 22 EXPLODED VIEW (5053 TRANSMISSION) . . . 23 PARTS UST (5053 TRANSMISSION) . ..... . 24 EXPLODED VIEW (5058 TRANSMISSION . . . 25 PARTS LIST (5058 TRANSMISSION) ... . . . . 26 SECTION I I I 5060 6-SPEED TRANSMISSION Description . .. . .. . . . . ... . . . ...... . . Removal .... .. . . . . ... . . .. . .. . ... . . Instal lation ... . .. . . . . . . . . . . .. . . ... . Page 27-36 27 27 27 Disassembly . . . . . . . . . . . . . . . . .. . .. . . 28-29 Cluster Gear . .. . . . . . . . . . . .. . . . . . . . . 29 Cleaning, Inspection, Bearing and Oil a l Replacement . . . . . . . . . . . . . . 29 Assembly . . . . . . .. . . . . . . . . . . . . . . . . . 30-32 LIMITED SLIP DIFFERENnAL . . . . . . . . . . . . . 32 -34 Disassembly . . . . . . . . . . . . . . . . . . . . . . . 32-33 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 33-34 EXPLODED VIEW ...... ... . .. .. ... . ... . PARTS LIST SECTION IV 4-SPEED UNIDRIVE TRANSMISSION Description .. . . . . . . . . . . . . . . ..... . . . Removal . . . . . . . ..... . . . . . . . .. . . . . . 35 36 37-44 37 37 Installation . . . . . . . . . . . . .. . . . . . . . . . . 37 Disassembly . .. . . . . . . . . . . . . . . . . . . . . 37·40 Cleaning, Inspection, Bearing and Oil Seal Replacement . . . ....... . ... 40 Assembly . . . . . . . .. . . . . . . .. . . ... . . . 40-41 DIFFERENTIAL OVERHAUL . . . .. . . . . . . . . . 42-43 Disassembly . . . . . . . . . . . ... . . . . . . . . . 42 Assembly . . . . . . . . . . . .. . . . . . . . . . . . . 42-43 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . 43 PARTS LIST 44 SECTION V 8-SPEED TRANSMISSION 45-53 Description . . . . . . . . . . . . . . . . . . . . . . . . 45 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Installation . . . . . . . . . .. . . . . . . . . . . . . . 45 Disassembly . . . .. . . . . . . . . . . . . . . . . . . 45-47 Needle Bearing Replacement . . . . . . . . . 47 Cluster Gear . . . . . . . .. . . ... . . .. . . . . . 47 Cleaning, Inspection, Bearing and Oil Seal Replacement . . . . . . . . . . . . . . 47 Assembly . . . . . . .. . . . . . .. . . . . . . . . . . 47-50 8-PINION DIFFERENTIAL . .. . . . . . .. . . . .. . Disassembly . . . .. . .. ... .. . . . .. . . . . . Assembly . . . .. .. ... . . . . . .. . . . . .. . . 50 50 50 EXPLODED VIEWS . . . . . . . . . . . . . .. . . . . . 51-52 PARTS LIST . . . .. . . . . .. . . . . .......... . 53 -3- www-MyWheelHorse-com

TRANSMISSION USAGE .. _---_- YEAR ACTOR MODEl ANSMISSION USED NUAL SECTION 1958 1959 RJ-58 RJ-59 1960 Suburban 1/4001/ & 1/500"   1961 401 551, 701 5003 5010 . 5010 5007 I 1/ ...  .--�-- 1962 502, 552, 702, 32E, 32R - - -- - 1963 33E, 33R, 603, 633 , 653, 753 1964 953 34E, 34R, 604, 654, 704 854 1045 1054  ---_._---._ .. -.. 1965 1966 L·l05, l·155 60S, 655, 855, 1055 1054A _._. -  l· 106, l-· 156, 606, 656, 1046, 1056, 856 5025 II 5025 II 5045 II 5046 5025 5025 5047 . .... _--_. II II II II 5048* II 5049 II 5051 II ._--_-- 5053 II 5053 II   --._-----_.  - 1967 1968 1969 1970 1971 1972 L.l07, l-157, 607, 657, 857 867, 1067, 1267 1057, 1257 - lawn Ranger lawn Ranger 1/500" Special Commando 6 Commando 8 Raider 9, 10 Raider 12 Workhorse "7001/ Raider 10 Raider 12 Raider 10 Raider 12 Raider 12 Workhorse 1/8001/ Raider 10 Raider 12 Raider 8 Reider 10 Raider 12 Raider 14 Commando "800" 1-2631 Electric 1-1631 Recoil 1-3631 1-4631 1-4831 1-6931 1-6041 1 ·6231 1-6241 1-3745 -1-3741 1-6041 1-6241 .. �----. 1-6051 1-6251 1-6253 1-0100 1-0300 1-0310 1-0330 1-0301 1-0311 1-0320 1-0110 5053 II 5060 III 5058 II 5053 II 5053 II 5053 II 5053 II 5053 II 5060 III 5060 I II 5053 II 5071 I I I 5071 III 5073 V 5073 V 5073 V 5080 IV 5073 V 5073 V 5086 V 5086 V 5073 V 5073 V 5085 IV  - - 1973 8 HP Eight Speed 10 H P Eight Speed 12 HP Eight Speed 14 HP Eight Speed 8 HP Four Speed 1-0370 1-0360 1-0350 1-0340 1-0120 5086 V 5086 V 5073 V 5073 V 5085 IV  - . - _-- . - 1974 B-80 4 Speed C-100 8 Speed C-120 8 Speed C-160 8 Speed 1975 B·80 4 Speed C-100 8 Speed C-160 8 Speed Up-dot" 500  50S3 with 71D kit. 1-0140 1-0390 1-0353 1·0380 1-0141 1·0391 1-0381 -4 - 5080, 5084 5091 5091 5091 IV V V V ..•. _ . .  - 5084 5091 5091 IV V V www-MyWheelHorse-com

TRANSMISSION USAGE YEAR TRA ML VIN NUMBER ANSMISSION MANUAL US N 1 976 6-< 8-Speed 6 1 -07K80 1 ǽ1 V 6-80 B-Speed 6 1 -08K80 1 , ǽ1 V 6 1 -08K802 & 6 1 -08K804 6-80 B-Speed 61-08K803 1 03Z7 V 6-1 B-Speed 61-10K80I, ǽ1 V 6 1 -IOK802 & 61-10KP4 8-1 8-Speed 61 -IOK803 1 03Z7 V C-I20 B-Speed 61-12K80I, ǽ1 V 61 -1 2KP2 & 61-1 2KP4 C-I20 B-Speed 61-1 2K803 103Z7 V C-1  a-Speed 61-16KBOI, ǽ1 V 6 1 - 1 6KB02 & 61-16K804 C-1  8-Speed 61-1 6K803 1 03Z7 V 1977 8-< 8-Speed 7 1 -07K801 1 03Z7 V 8-80 8-Speed 7 1 -08K801 1 03Z7 V 8-1 a-Speed 7 1 - 1 0K80 1 1 03Z7 V C-I20 8-Speed 7 1 - 1 2K80 1 1 03Z7 V C- 1  a-Speed 7 1 - 1 6K80 1 & 1 03Z7 V 71-16K802 1 978 C-81 B-Speed 81-08K801 1 03916 V C-10 1 8-Speed 8 1 -IOK801 1 03916 V C-121 8-Speed BI-1 2K801 1 03916 V C-1 41 8-Speed BI- 1 4K801 1039 16 V C-16 1 8-Speed 81-1 6K80 1 1 039 1 6 V C-1 61 Twin 8-Speed BI-168801 103916 V 1 979 C-81 B-Speed 9 1 -(K80 1 & 103916 V 9 1 -(KP2 C-101 B-Speed 91-IOKP1 & 1 039 1 6 V 9 1 - 1 0KP2 C-III B-Speed 9 1 - 1 1 6801 1 039 1 6 V C-12 1 8-Speed 9 1 - 1 2K801 & 103916 V 91-12KP2 C- 1 41 8-Speed 9 1 - 1 4K80 1 & 1 039 1 6 V 9 1 - 1 4KP2 C-1 61 8-Speed 91-16K80 1 1 039 1 6 V C-161 Twin 8-Speed 91-166801 & 103916 V 91-166P2 - 4A - www-MyWheelHorse-com

TRANSMISSION USAGE YEAR TRA MOÞL VIN NUMBER TRANSMISSI MANUAL USED SEI 1 980 C-85 8-Speed 01 -08KP1 & 103916 V 0 1 -08K802 C-1 05 8-Speed 01-10KP1 1 039 1 6 V 1 1  Special 01- 1 1 B803 5086 V C-1 25 8-Speed 0l-1 2KP1 1 0391 6 V C-1 45 8-Speed 01- 1 4KP1 1 039 16 V C-l65 8-Speed 01- 1 6KP1 1 039 16 V C-1 75 Twin 8-Speed 01- 1 7K802 1 039 16 V E-1 41 8-Speed 01 -1 4E801 103918 V 1981 C-85 8-Speed 0 1 -08K802 1 039 1 6 V C- 1 05 8-Speed 0 1 - 1 0K802 1 0391 6 V C-1 25 8-Speed 01- 1 2K802 1 03916 V C- 1 45 8-Speed 0 1 - 1 4K802 103916 V C-1 65 8-Speed 0 1 - 1 6K802 103916 V C-1 75 Twin 8-Speed 0 1 - 1 7K802 1 03916 V E-1 41 8-Speed 01- 1 4E801 1 039 18 V GT-220 8-Speed 01- 1 1 B804 Ꮮ V 1 982 C-85 8-Speed 0 1 -08K803 1 039 16 V C-1 05 8-Speed 0 1 -lOK803 1 039 16 V C-1 25 8-Speed 0 1 - 1 2K803 1 039 16 V C-1 75 Twin 8-Speed 01- 1 7KP3 103916 V E-1 4 1 8-Speed 01- 1 4E801 1 0391 6 V GT-1 1 42 8-Speed Al- 1 1 420l Ꮮ V GT- 1 @2 8-Speed Al-1 @201 2V V SB-421 8-Speed 01- 1 1 BH01 5V V SK-4V 8-Speed 01 -1 6KH01 Ꮮ V - 48- www-MyWheelHorse-com

Section I 5003 • 5010 TRANSMISS IONS DESCRIPTION The 5003 and 5010 transmissions are readily iden- tifted by their removable steel side covers wh ich are bolted to a one piece cast iron case. The transmissions are of the sliding gear type and provide three speeds forward and one speed in reverse. All shafts operate on needle or ball bearings sup- ported by the steel side covers. The differential is of the spur pin ion type. On all original equ ipment transmissions, the ring gear is an integral part of the d ifferential case. The s,rvice reo placement, however, consists of a case and gear as· sembly in which the gear is bolted to the d ifferential case. RATIOS lst gear . . . . . . . . . . . . . .. 6 6.8 to 2nd gear . . . . . . . . . .. . . . 42.4 to 3rd gear . . . . . . . . . . . . . . . 24.6 to Rever . . . . . . . . . . . . . . . 5 1 . 5 to REMOVAL AND REPLACEMENT Removal: Remove any mid-mounted or trailing attachment which might interfere with transmiss ion removal. Provide. some support under the tractor frame ahead of the transmission. Remove the seat, fender and tool box assembly if so equipped, belt guard, belt , and clutch rod. Discon- nect the lift cable and remove the hitch. Installation: Instal l c lutch and idler arm asmbly, brake rod, and input pulley. Instal l whee ls and hubs and move assembly into place on the tractor. Install three bolts through holes in each transmiss ion side cover and corresponding holes in frame side rails. Tighten nuts securely. -5 - Remove three bolts at each transmiss ion side cover and frame side rail. Move transmiss ion assembly away from the tractor. Remove the wheels and hubs, clutch and idler arm assembly, and transmiss ion input pul ley. Drain lubr icant and clean case as necessary before disassembl ing. Install drive belt and belt guard. Connect clutch rod. lay lift cable in p lace along top of transmission, instal l hitch and connect lift cable. Install fender and tool box assembly if so equipped, and instal l seat. Remove support from be- neath tractor frame. www-MyWheelHorse-com

500]·5010 ].SPEED TRANSMISSION Disassembly: The transmission should be mounted in a vise or suitable fixture as shown in Figure 1, with the left cover up and the gear shift lever and top of the case toward the mechanic working on the unit. FIGURE 1 The following steps are for complete disassembly with the transmission in the vise, as shown in Fig- ure 1. 1. Lift the rubber shift lever boot and loo�en the shift lever set screw and lock nut, and remove the shift lever. 2. Remove the two bolts that hold the brake band to the side cover bracket and remove the brake band. 3. Remove the snap ring (some models may have a set screw) from the brake shaft and remove the drum using a suit able puller as requi red. Remove the Woodruff key from the brake shaft. FIGURE 2 -6 - GURE 3 4. Clean and remove all burrs from both axle shafts and brake shaft and remove both axle seals. 5. Remove the nine left cover retaining bolts and lift off the cover. NOTE: Figures 2 and 3 show the two types of covers used on these transmissions, one with a ball bearing and one with a needle bearing at the brake shaft location. Re- placement information for each type is given in Service Notes 1 and 2, Page 12. FIGURE 4 6. Remove the spline shaft and pinion gear. See Figure 4. NOTE: The shaft and matching gears in some transmissi ons have 10 splines while later models have 11 splines. For details and ordering information, refer to Service Note 3, Page 12. 7. Remove the bolts from t he right cover and break the case loose from the cover gasket. This will allow the case t o shift sufficiently to let the cluster gear assembly to be worked loo and re- www-MyWheelHorse-com

moved, as shown in Figure 4. The cluster gear may be disassembled as shown in F igure 5. Dis- assemble and assemble carefu l ly to avoid damage to the Woodruff keys and bushings. The cluster gear bushings may be removed an d in- stalled using suitable arbors. GURE 5 GURE 6 8. Remove the low and reverse, and the hIgh and second sliding gears. If either gear is to be re- placed, refer to Service Note 3. Page 9. 9. lift the brake shaft gear s lightly, and rotate the transmission case to the right and upward. over the top of the input gear. Position the case so that the differential ring gear is centered be· tween the two seat spring bosses. The case may now be removed by working it up over the differential ring gear. -1- 1 0. Remove the differential and axle assembly, the brake shaft gear and the input gear and shaft. See Figure 7. Remove the input shaft seal. FIGURE 1 FIGURE 8 11. To remove the reverse idler gear, dr i ve out the roll pin from the idler gear pin and remove the pin a nd gear. See Figure 8. (Early models used a roll pin at each end of the idler gear p in.) 12. Before removing the shift forks and shift rails. mating parts should be marked or scribed so they may be reassembled properly. The shif t fork retaining roll pins may be removed by dr iv- ing them out with a X" punch inserted thro ugh the shift lever tower. Remove the shift rails mak· ing sure to catch the two balls, spring and stop pin as they are released. NOTE: Althoug h the shift forks are identical, the shift rai ls differ. The low and reverse shift rail (located nearest www-MyWheelHorse-com

the end of the case) has three equally spaced detent grooves. The high and second shift ra il has two of the three det ent grooves closely spaced. Cleaning, Inspection, Bearing and Oil Seal Replacement Thoroughly clean all parts and inspect for damage and wear. Use suitable arbors when replacing bearings. Always renew all oi l seals and gaskets. If the differential and ax le assembly is to be serv- iced, refer to Differential Overhaul Section. 5003 ·5010 3·SPEED TRANSMISS ION Assembly: 1. Install the reverse idler gear in position so that the chamfered end of the gear faces the left side of the case. This will position the gear with the straight edge toward the right side of the case, as shown i n Figure 9. Install the reverse idler pin and secure with a K," roll pin. - - . - I FIGURE 9 2. Position the low and reverse shift fork (the one nearest the e nd of the case) between the shift rail supports so that the shift lever groove points toward the opposite shift rail. 3. Insert the low and reverse shift rail (the one with the equally spaced detent grooves) and -8- slide into position, making sure the detent grooves are toward the opposite shift rail. - cure the shift fork to the s hift rail with a " x 1" roll pin. 4_ Position the low and reverse shift rail assembly so that the center (neutral) detent groove lines up with the detent hole and install one of the stop balls, spring and the shift stop pin. 5. Place th e other bal l on top of the spring and push the ball and spring through the high and second shift rail bore with a K6" punch until the �all is flush with the bore. Insert the high and second shift rail, removing the punch as the shift rail passes the ball. 6. Position the shift fork on the shift rail so the shift Qroove faces the opposite shift rail, and continue to slide the rail into place, making sure the detent grooves are facing the stop ball. Secure the shift fork to the shift rail with a " x 1" roll pin. FIGURE 1 0 7. Place the right side cover in a vise. Install the input gear and shaft assembly. See Figure 10. 8. Install the side cover gasket using gas ket sealer to hold in position. 9. Install the brake shaft gear. 1 0. Install the different ial and axle assembly. Ser Figure 10 showing the input gear, brake shafl gear and differential assembly in position. www-MyWheelHorse-com

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Wheel horse tractors unidrive transmission repair service ma

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