51
DIFFERENTIAL
Before assuming internal swiftamatic difficulties, inspect the external linkage and parts for binding. Carefully
check the following:
1.
Check linkage for binding, sheared spring pin, loose nuts or debris build up.
2.
Check to see that the shifter arm is not binding on the stationary pivot.
3.
Check to see that the clutch sliding pivot is free.
4.
Check to see that the extension spring is in place.
5.
Check stationary clutch bolt. Be sure it is not sheared.
6.
Raise tractor wheels. Turn one wheel by hand. The other wheel should turn in the opposite direction.
Check for tightness and rough spots while turning.
DIFFERENTIAL REMOVAL
1.
Drain oil from transmission.
2.
Raise tractor and remove wheels.
3.
Remove right hand wheel hub.
4.
Disconnect swiftamatic shift linkage.
5.
Remove right hand axle housing with axle.
6.
Carefully examine the shifting yoke, shifting clutch, stationary clutch and clutch housing. Particular
attention should be given to see that the stationary clutch is properly secured against rotation. Also
make sure the shifting clutch slides freely on the shifting gear.
7.
If no discrepancies have been found at this point or if the failure is obviously a part of the differential
assembly remove the differential assembly.
8.
Remove left hand wheel hub.
9.
Remove left hand axle housing with axle.
10.
Remove the differential assembly from the tractor.
Note:
The following steps (11 through 21) refer to tractor prior to serial number J-65504. Refer to steps
22 through 32 for tractor serial number above J-65504. Steps 33 through 38 apply to all tractors.
11.
Secure the differential assembly upright in a vise.
12.
Bend down locking plates and remove six (6) bolts securing clutch housing to worm gear.
13.
Lift off clutch housing. Remove shims.
14.
Remove internal parts of differential. Carefully check all parts for damage or abnormal wear.
Abnormal conditions include:
1. Scoring of thrust washers.
2. Scoring of spider pin arms.
3. Scoring of bore of gears.
4. Scoring on the back of gears.
5. Chipped teeth.
6. Heavy wear on gear teeth.
15.
Examine internal surfaces of the worm gear. An even wear pattern is normal, however it should not
exceed .010 inch. If the gear is pitted in spots or has small gouges, polish these areas.
