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Ampco Pumps Company ZP3 Manual M-004 Rev A 10.15
Maintenance
Ampco Pumps Company
Single Seal Maintenance
6) Install the Bellville washers in the rotor nuts in the orientation shown and hold them in place
using the small retaining o-rings (Figure 32). Install a rotor nut o-ring before threading the
nut onto the shaft.
7)
Thread the nut onto the shaft and tighten it down using the appropriate wrench and a non-
metallic wedge to hold the rotor in place (Figure 33). Torque the rotor nuts down using 163 N-
m of force. Orientate the rotors as seen in Figure 33 and
Always
tighten the first rotor
positioned under the overlap of the opposing rotor. Repeat with the second rotor in the same
orientation.
8)
Install a 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 34). 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 34, so that the cover is evenly tightened to the body.
Rotor Nut
Bellville Washer
Retaining O-ring
Figure 32: Rotor Nut Assembly
Rotor Nut O-ring
Figure 33: Rotor Assembly
Overlap
Wedge
Figure 34: Cover Assembly
