Product Manual A

Maintenance
31609 A MTP4000-6000DZV/DZD Operating Manual 67
Replacement:
1. On a new replacement shaft, with a zero lead ground lip seal surface, no speed-sleeve is required. On a
reinstalled shaft, when surface condition dictates, or on a new shaft with a turned surface, install a speed-
sleeve .06-.12 in. (1.52-3.0 mm) past the outside drive end shoulder. Refer to Figure 25 on page 64.
2. Carefully slide the opposite drive end of the shaft and bearing assembly into the drive end of the housing
through the con-rod bushing and engage the shaft end in the ODE bearing.
3. Fit the lock washer, engaging locating tab in the shaft groove.
4. Fit the bearing locknut and tighten with ‘C’ spanner; bend lock washer tab into groove.
5. Replace the appropriate total thickness of shims to leave .007 in. to .010 in. (.177-.254) clearance between
the ODE bearing and installed cover.
6. Fit the ODE bearing cover and new O-ring; secure with four 1/4 in. capscrews. Tighten to 10 ft-lbs (13.5
Nm).
7. Fit the drive end bearing cover complete with lip seal and new O-ring. Secure with four 1/4 in. capscrews.
Tighten to 10 ft-lbs (13.5 Nm).
8. If the actuator shaft has been disassembled from connecting rod, reassembly with the bushing fulcrum pin
and snap rings before continuing.
9. Carefully lower the pedestal, complete with seal O-ring and linear bearing, over the actuator shaft. (Assem-
bly tool [P/N: 52655] is available to assist with reassembly of the pedestal without damage to the lip seals.
Contact Generac Technical Service.)
10. Secure the pedestal with the top flat relief properly oriented to clear the inlet nozzle.
11. Refit the actuator neck seal and remaining components. Refer to “Actuator Neck Seal Removal and
Replacement” on page 66.
12. Refill the bearing housing with 10W-30 oil. Fill so static oil level is at the center of the sight glass. Do not
overfill.
CRANKSHAFT LIP SEAL REMOVAL AND REPLACEMENT
1. Remove the 1/2 in NPT drain plug from the bearing housing. Drain and discard oil.
2. Remove the four 1/4 in. capscrews from the drive end bearing cover.
3. Remove the drive end bearing cover complete with lip seal.
4. Remove and discard the O-ring.
5. Pull the lip seal from the cover and discard.
6. Clean and lubricate the lip seal cavity. Press in the lip seal fully against the shoulder (lip nearest the bear-
ing).
7. Inspect the speed-sleeve; replace if required.
8. Lubricate the shaft sealing surface.
9. Fit the new O-ring on the bearing cover and slide the assembly over the shaft. Align the screw holes.
10. Secure the cover to the bearing housing with four 1/4 in. capscrews. Tighten to 10 ft-lbs (13.5 Nm).