Maintenance
Ampco Pumps Company
Page 23
Ampco Pumps Company ZP3 Manual M-004 Rev A 10.15
Pump Assembly
1)
Make sure all seal components are installed by following “Seal
Assembly” instruction provided on page 17.
Ensure all dowels are
in place and that all parts including body, rotors, and rotor nuts are
clean and free of foreign matter. Slowly slide the body over the
gear case studs and shafts, ensuring the seals are kept in place
and not damaged (Figure 40). Install the two hold down bolts and
tighten the body against the gear case to ensure the dowels are
engaged. Rotate the shafts to make sure there is no
interference with the seals.
2)
Insert rotor key in the keyway on the shaft. Install a new rotor hub o-ring on the rotor hub
and align the rotor keyway to the key in the shaft (Figure 41, A). Slide the rotor on until it seats
against the shaft. Install the Bellville washer in the rotor nut and hold it in place using the small
retaining o-ring (Figure 41, B). Place one nut on at a time, tightening them down using the
appropriate wrench and a non-metallic wedge to hold the rotor in place (Figure 41, C). See
Table 5 for required torque values. Repeat with the second rotor.
Figure 41: Installing and Securing the Rotor
3)
Install the new cover o-ring and slide the cover over the studs making sure that the dowels
in the body are aligned with the correct dowel holes in the cover (Figure 42). Visually inspect
to ensure that the cover o-ring remained in place. Turn the cover nuts (clockwise) by hand and
fully tighten them using the appropriate wrench. Tighten the rotor nuts in an opposing manner
as seen on Figure 42, so that the cover is evenly tightened to the body.
Figure 42: Cover Assembly
Figure 40: Installing
Pump Body
ZP3 Model
ft-lbs
N-m
6, 15, 18
50 68
30, 34
120 163
45, 60, 64,
130,134
250 339
180, 220, 224
325 441
210
375 508
Torque
Table 5: Recommended
Rotor Nut Torque Values
Install Hold
Down Bolts
Wedge
Wedge
B
A
C
