McLaughlin McL-12HB ZIPPER, Components And Repair Manual

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STEP 2 (Con’t)
25. Tighten the bolts on the large sprocket bushing.
Continue to check distance from the machine
frame.
26. Check the chain alignment. Move the small
sprocket as required to align the chain.
27. Tighten both setscrews of the small sprocket.
28. Apply grease to the chain.
29. Install chain cover (Ref. Step #1).
STEP 3:
SHAFT AND BEARING REMOVAL
1. Remove chain cover (Ref. Step #1).
2. Remove large sprocket (Ref. Step #2).
3. Using a screwdriver, pry up the tabs of the spanner
washer (Fig. 1, #13) that have been bent into the
slots of the spanner nut (Fig. 1, #12).
4. Unscrew the spanner nut from the drive shaft.
Make sure that the shaft threads are clean before
attempting to unscrew the spanner nut (Photo #6).
5. Slide the spanner washer off of the drive shaft
(Photo #7).
6. Grasp the flange of the drive shaft and gently pull
the shaft out toward the front of the machine.
(Photo #8).
7. Remove the tapered roller bearing (Fig. 1, #14)
from the rear end of the shaft tube.
8. To remove the oil seal and front bearing, use a
piece of soft steel or aluminum tubing (2” o.d. x 8-
10”). Slide this tube into the drive shaft housing
tube until it makes contact with the bearing.
Gently push the bearing until it touches the oil seal.
Lightly tap the end of the soft steel tube until the oil
seal and bearing are released.
9. Inspect all components for dirt, cracks, wear or
damage. Replace parts as needed.
10. TO BEGIN REASSEMBLY - Repack the bearings
with wheel bearing grease. Make sure all slots are
filled with new grease.
11. Slip each bearing into the drive shaft tube until it
stops. Slowly turn the bearings to ensure smooth
movement.
12. Install the seal by holding a flat piece of smooth
metal or wood against the face of the seal and
uniformly tapping the piece of wood or metal with a
hammer. Hammer until face of the seal is flush
with the end of the tube, in all directions. Do not
hammer directly against the seal.
13. Grease the input shaft and insert the drive shaft
into the drive shaft tube. Take care not to damage
the seal.
14. Slip spanner washer onto the end of the shaft until
it stops. Note that the inside diameter of the
spanner washer is keyed with a tab. Align the tab
with the shaft keyway. The outside diameter tabs
8.3.0
6
7
8