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Woodruff key
it is first necessary to remove the clutch housing as outlined in paragraph 201, 202 or 202A. The shaft and bearing assembly is removed from the clutch housing by removing the bearing retainer (4—Fig. A18) and bumping on the forward end of the shaft (10). Bearing (5) may be pressed off
Transmissions in models BF, BG and R ore oi the 4 speed type; in the models A and
V they are oi 3 speed type, basically similar in design to the BF and R. The transmission and differential assemblies are both contained in the same case to which are attached the final drive units. A wall in the case separates the differential from the transmission gear set. To overhaul the transmission it is necessary to remove the unit from the tractor and to remove the final drive units and differential from the transmission.
On raodel A tractors the transmission countenihaft. which is the main drive bevel pinion, can be purchased separately from the bevel ring gear. On models BF, BG, R and V the bevel pinion and ring gear are avallabie only as a matched set.
The combination belt pulley and power transmission case may be directly removed without disturbing the differential unit. R & R TRANSMISSION
220. Install a wheeled jack under transmission case and place support els A, BF, BG and R also remove the model V where transmission case is being removed only to R & R the propecals. Detach transmission case from the main frame and roll the case and final drive assemblies as a single unit away from the tractor.
OVERHAUL Mode!!i A-V
221. T4ODEL A SHIFTER UNIT. the shaft after removing the retaining snap ring (6).
R & R CLUTCH UNIT
205. R & R of the clutch assembly requires R & R of the clutch housing as outlined in paragraph 201, 202 or 202A. After the clutch housing and
TRANSMISSION
the transmission side cover. The pro1947 and later may be removed with222. MODEL V SHIFTER UNIT. clutch shaft unit are removed, place a piece of 5/16 inch key stock approximately one inch long between each release lever and clutch backing plate (cover) to hold the pressure springs partially compressed. This procedure will facilitate both removal and reinstallation. When reinstalling unit to flywheel, use the original or a dummy alignment of the lined plate splines.
take-off which mounts in the rear of the
under main frame behind clutch housing. Remove rear wheels, fenders, seat, propeller shaft cover and on the mod* instrument panel. (In the case of the peller shaft, the fenders, seat and rear wheels need not be removed.) Remove cotter pin which retains front universal joint to the transmission mainshaft, drawbar pin from cross member, and tail light bracket or the straps extending from brake upper cover to frame channels. Disconnect brake rods at
Shifter rails and forks are located in
cedure for overhaul of this assembly is apparent after studying Fig. A19. Removal of the cover from model A tractors prior to 1947 requires removal of the main frame right side channel. Cover on model A tractors built in out disturbing main frame channels. clutch shaft to obtain and maintain
The shifter control assembly (34—Fig.
Fig, Al9—Model A tronsmissfon shift mechanism which is built into the transmission cover,
1. Lever snap ring 2. Lever pivot washer 3. Shift lever 4. Cover assembly 5. 1st and reverse shift rail 6. 2nd and 3rd shift rail 7. Shift rail lockpin (short) 8. Shift rail lockpin (long) 9. 1st and reverse shift fork 10. 2nd and 3rd shift fork 11. Shift mesh lock spring 12. Shift mesh lock ball A20) is located in transmission side cover and cannot be overhauled. When worn the complete assembly is renewed. (When removing cover, note that the top center cap screw is shorter than the others. Be sure to reinstall it in the same position to prevent interference with movement of shift lever.) 223. MODEL A MAINSHAFT. First step in removal of this shaft is to re
move the transmission and final drives as a single unit from the tractor as per paragraph 220. Next remove the side cover (shifter rails) and the rear cover. Remove mainshaft bearing retainer (19—Fig. A21) at front of case, and push forward on mainshaft (14) from the differential chamber. Shaft and front bearing cone (17) and cup (16) will come out of case.
When reinstalling, adjust the tapered roller bearings by means of shims (18) between bearing retainer and case to provide end clearance of 0.002-0.005. Install oil seal (20) with lip toward inside of case. 224. MODEL V MAINSHAFT. With transmission removed from tractor, remove the control cover (35—Fig. A20) and control assembly (34). Remove rear cover (37) and retaining ring (10) through differential chamber. (If difficulty is encountered in removing this ring, it may be necessary to remove final drive units and differential assembly.) Pry out front seal (21) and remove front bearing snap ring (20). Push forward on shaft to remove from case. Mainshaft is supported on non-adjustable bearings. Renew bushing (8) in rear of mainshaft if worn. Install seal (21) with lip toward inside of case. 225. BEVEL PINION (COUNTERSHAFT) SHAFT. To remove integral countershaft and bevel pinion, remove the transmission from the tractor as per paragraph 220. Detach both of the final drive units from the transmission case. Remove the rear cover (or combination belt pulley and power take-off if used) and differential bearing carriers, and lift out the differential unit. Be careful not to mix the shims. Remove the transmission cover, cap (21—Fig. A21), or (22—Fig. A20) adjusting nut (22) or (23), and tap on forward end of shaft until free of front bearing then withdraw from rear of case.
If the bevel pinion shaft on model A tractors is damaged, it can be renewed separately. On model V, the bevel pinion cannot be renewed separately as it is available only with mating bevel ring gear as a matched set.
