Maintenance
Ampco Pumps Company
Page 29
Ampco Pumps Company ZP3 Manual M-004 Rev A 10.15
Gear Case Maintenance
4)
Set the gear case on a press with the fluid end side facing up. Place the required thickness
of shim stock so it sits on the shoulder of the front shaft bore of gear case. Apply lubricant to
the outside of the bearings. Place shaft assembly (one shaft at a time) in the gear case with
the rotor end facing up. Making sure that the drive and the short shafts are in the correct
bores, press the shafts into the gear case until bearings are fully seated (Figure 54). See
Table 6 on page 26 for the required force.
Figure 54: Pressing Shafts into Gear Case
5)
Once the shafts are pressed into the gear case, install the bearing retainers to hold the
shafts in place temporarily (do not install liquid sealant). Ensure there is proper clearance
between the retainer and the gear case, as seen in Figure 55. Place the body on the gear
case, making sure it is seated correctly. Assemble the rotors into the body and tighten down
using the rotor nuts. Measure dimensions A, B, and C seen in Figure 56 and refer to Table 4
(page 22) to verify the clearances. If clearances are not correct, the shafts must be removed
and the shims will need to be adjusted. If the clearances are correct, remove the rotors and
body.
Front Bearing
Bore
Required
Shim Stock
A
B
C
Bearing
Bearing
Retainer
.010”-.050”
Figure 55: Bearing
Retainer Clearance
Figure 56: Important
Clearances
