Input Shaft Repair
1.Disconnect and remove the driveline from the gearbox.
2.Remove drain plug and drain gear lube from the gearbox.
3.Remove mast plates from the tiller frame.
4.Remove shaft seal. Replace with new seal (see Seal Installation, page 20).
NOTE: Distortion to seal cage or damage to seal lip will cause seal to leak.
5.Reinstall drain plug and remove fill plug. Fill gearbox with SAE 80W or 90W gear lube until it runs out the level plug.
Output (Hollow) Shaft Repair
1.Disconnect and remove the driveline from the gearbox.
2.Remove drain plug and drain gear lube from the gearbox.
3.Remove the gearbox side drive shield.
4.Remove the drain plug from the chain case to drain the gear fluid.
5.Remove chain case cover.
6.Remove retaining bolt and washer from the top sprocket.
7.Release the tension from the chain, Figure 15, and remove the top sprocket and sleeve from the side drive shaft.
8.Loosen the set screw on the side drive shaft bearing. This bearing is located inboard of the top sprocket, at the top of the chain case. Use a hammer and a punch to unlock the locking collar. This is achieved by putting the point of the punch in the relief of the collar and drive it in the direction opposite of normal rotation for the tiller.
9.With the sprocket removed and the locking collar freed, the side drive shaft can be removed through the opposite side of the tiller gearbox.
10.The faulty shaft seal can be removed and replaced with a new seal (refer to Seal Installation, page 20)
11.Follow the instructions 1 through 9 in reverse for reassembly. Use blue Loctite® on bolts used to retain sprockets on shaft. Make sure top and bottom sprockets and chain tensioner are aligned with each other. Shaft end should be recessed from sprocket outside face by .03 inches on top and bottom sprockets.
Figure 15. Release Chain Tension
(Rev 9/28/2010)
MAN0814 (3/11/2010)
