Pioneer PT Series Operation & Maintenance Manual page 17

SEAL INSTALLATION CONT'D
Very carefully slide the seal plate over the shaft and up against the bearing housing register.
This requires caution to prevent bumping the mechanical seal stationary seat against the shaft.
The silicon carbide stationary seat is very brittle and will chip easily. Once the seal plate is
positioned against the bearing housing register it should be secured with a bolt and nut or a c-
clamp until you're ready to install the case. Alternately the reassembly can be performed with
the pump positioned vertically – pump-end of the shaft pointing upward.
Now lubricate the entire service of the shaft sleeve with liberal amounts of 30 wt motor oil or a
very thin film of STP® or heavy gear oil. Likewise, lubricate the inside diameter of the
mechanical seal bellows. Place the mechanical seal spring guide over the sleeve and up
against the flange at end of the sleeve. Make sure that the open side of the spring guide facing
the non-flanged end of the sleeve. Place the mechanical seal spring over the sleeve and up
against the spring guide. Push the mechanical seal onto the sleeve with the polished face away
from the spring. Push the seal up the sleeve until the spring rests against the back of the
mechanical seal. The remainder of the seal and impeller installation must occur right away so
that the mechanical seal does not "set-up" in the wrong position on the sleeve.
Place the shaft sleeve o-ring over the end of the shaft and up against the shaft shoulder (where
the sleeve abuts). Apply a little grease or oil to the o-ring. Slide the mechanical seal / sleeve
assembly over the shaft with the flanged end of the sleeve toward the end of the shaft. Slide the
assembly as far as the seal spring will allow.
Apply a small amount of Loctite 262® (red) or equivalent to the shaft threads, and install the
impeller. As with impeller removal, attach a strap wrench or bearing nut spanner to the drive-
end of the pump shaft. Have an assistant hold this wrench to immobilize the shaft. Tighten the
impeller as much as possible by hand by rotating it clockwise.
A new seal assembly should be installed anytime the old seal is removed. The wear pattern on
the old seal can cause premature failure if reused.
For pusher-type seal
Clean the seat bore in the seal plate and lubricate with 30 wt. motor oil. Lubricate the o-ring of
the stationary seat, and press the seat into the seal plate bore using your fingers (tools may
break the seat). Make certain that the seat is seated squarely against the bottom of the seal plate
bore. Using a clean rag, wipe the face of the stationary seat. Apply a few drops of 30 wt motor
oil to the stationary seat face.
Very carefully slide the seal plate over the shaft and up against the bearing housing register.
This requires caution to prevent bumping the mechanical seal stationary seat against the shaft.
The silicon carbide stationary seat is very brittle and will chip easily. Once the seal plate is
positioned against the bearing housing register it should be secured with a bolt and nut or a c-
clamp until you're ready to install the case. Alternately the reassembly can be performed with
the pump positioned vertically – pump-end of the shaft pointing upward.
Now lubricate the entire service of the shaft sleeve with 30 wt motor oil or a very thin film of
STP® or heavy gear oil. Likewise, lubricate the inside diameter of the mechanical seal o-ring.
Push the mechanical seal onto the sleeve with the polished face away from the spring. Push the
seal up the sleeve until the seal spring rests against the sleeve flange.
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