F-750-025-A / rev 12.20 – ZCM- ZCHM Series Metric Manual
7
and then place the seal spring into the
rotating seal element. Once the shaft sleeve is
prepped, push it onto the stub shaft until it
seats against the
shoulder.
Figure 5: Stub shaft preparation
6)
Place the casing gasket [9] onto its spot on
the cover [4].
Figure 6: Cover gasket on to cover
7)
Place the key [22] into the stub shaft [6]
and align it so it also engages in the shaft
sleeve [12]. If you have a stepped key, the
taller side goes toward the motor. Install the
impeller [3] onto the shaft [6]. Apply the
gasket or o-ring [11] and torque the impeller
screw to 50-60 ft-lbs [68-81 Nm]. Use blue
thread-locker on the threads.
Figure 7: Step 7 illustration
8)
Ensure the impeller does not rub against
the cover by turning it by hand. You are now
ready to attach the pump casing [1]. Have the
screws ready and apply the casing to the
cover. Tighten all the casing screws in an
alternating fashion to 25 ft-lbs [34 Nm].
Again, check the pump for rubbing by rotating
the stub shaft. If the impeller contacts, look
into the suction flange on the pump and see if
it is bound against the front wear ring. If it is,
please repeat step 2 and ensure you have the
correct measurement.
Figure 8: Step 8 illustration
