Maintenance
Ampco Pumps Company
Page 26
Ampco Pumps Company ZP3 Manual M-004 Rev A 10.15
Gear Case Maintenance
3)
To prevent damage to the shafts, wrap the keyway and rotor nut threads with tape (Figure
47, A). Any damage to the shaft or threads may require the shaft be replaced. Remove the
cap screws holding the bearing retainers in place and slide both bearing retainers off the shaft
(Figure 47, B). If they are stuck, use a flat head screw driver as a wedge to pry them from the
gear case or leave them in place and when the shafts are removed they will press off with the
shafts. Using a straight edge, remove the liquid gasket used to seal the bearing retainer to the
gear case.
Figure 47: Tape Shafts and Remove Bearing Retainers
4)
Set the gear case in a press with the fluid end side facing
down (Figure 48). Use a wooden block to protect the shafts
from hitting the ground when pushed out. Once the protective
block is in place, push the shafts out of the gear case.
Reference Table 6 for the required force (in tons) needed to
press the shafts out of the gear case.
Table 6: Required Force to Remove/Install shafts
5)
Remove all the shaft shims from the gear case and
label which shaft and bore they came from. If the
shafts are to be reused, they will need to be
reinstalled with the original shims. Failure to do so
could result in damage and misalignment in the pump
body. Remove and discard the rear oil seals from the
back of the gear case. Use a long, non-metallic rod
and a soft mallet to punch the seal out from the front
side (Figure 49, A). Remove and discard the front
bearing seals from the bearing retainers by pressing
them out (Figure 49, B). Clean the bearing retainers
as they will be reused. Clean excess grease and
sludge inside of the gear case before reassembling.
TAPE
WOODEN
BLOCK
ZP3 Model 6, 15, 18
30, 34
45, 60, 64,
130 134
180, 220,
224
210, 320
In (Tons)
.25 .25 .50 .50 .50
Out (Tons)
.50 .50 1.00 1.00 1.00
Figure 48: Pressing
Shafts From Gear Case
Figure 49: Removing Oil Seals
A
B
A B
