Pioneer PT Series Operation & Maintenance Manual page 15

PUMP CASE REMOVAL
Use a wrench on the hex section under the seal oil reservoir to remove the reservoir and oil
reservoir nipple. Remove the four nuts that secure the pump case and seal plate to the
bearing housing. The pump case can now be removed from the seal plate register.
CAUTION! At this point the seal plate will no longer be bolted to the bearing housing
register and should be supported so that it does not fall against the shaft. A bolt can be
placed through the bearing housing flange and seal plate flange and secured with a nut
until the seal plate is to be removed.
MECHANICAL SEAL REMOVAL
The pump shaft, mechanical seal rotating element and shaft sleeve will now be accessible.
It should be possible to pull the shaft sleeve and mechanical seal rotating element off the shaft
as an assembly. Now the seal plate can be pulled straight off. Take care to support the seal
plate while sliding it off of the shaft so that the mechanical seal stationary seat does not make
contact with the shaft. The stationary seat is very brittle and could break if bumped against the
shaft. If the mechanical seal is to be replaced, then this is not a concern.
Insert a screwdriver (blade-type) through the backside of the seal plate and against the backside
of the stationary seat retainer (if used) or the mechanical seal stationary seat. Tap the end
of the screwdriver handle with the heal of the hand to push it out. If the stationary seat is to be
reused, a towel or cushion of some type should be placed under the seal plate for the stationary
seat to fall onto.
Press the seal plate lip seal out from the impeller-side of the seal plate.
SHAFT AND BEARINGS
Remove the bearing housing drain plug and drain the oil. Clean plug and reinstall in housing.
Remove fasteners, and slide the bearing cover and bearing cover lip seal off the shaft. Press
the lip seal from the bearing cover. Remove the deflector from the pump-end of the shaft.
Place a block of wood against the impeller end of the shaft and gently tap the shaft and bearings
out of the housing. Alternately, a press can be used to remove the shaft and bearing assembly.
Clean the housing and components with appropriate cleaning solvent and use compressed air to
dry components. If bearings need replacement, use appropriate bearing puller to remove
bearings from shaft, or a press can be used to push the shaft out of the bearing.
RE-ASSEMBLY OF COMPONENTS
SHAFT AND BEARINGS
Clean all components with appropriate solvent. Inspect shaft and replace if distorted, nicked or
scratched beyond repair.
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