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REASSEMBLY CONT'D
If bearings are to be replaced:
The bearings may be heated to 250º F for ease of installation. An induction heater, electric
oven or hot plate may be used to heat the bearings. A direct flame should never be used. After
heating the bearings slide the bearings on the appropriate shaft end. If the bearings are shielded
on one side, the inboard bearing should be installed with the shielded side toward the
impeller, and the outboard bearing should be installed with the shield facing the bearing
cover. After installation of bearing, ensure that bearings are tight against shaft shoulders.
When installing the bearings onto the shaft press against the inner bearing race only.
Press a new bearing housing pump-end lip seal into the bearing housing. Make sure that the
open side of the lip seal case faces the bearing. Press the lip seal in until the closed side of the
case is flush with the pump-end face of the bearing housing. Use your finger to apply a coat of
grease to the seal lip. Apply a coat of grease to the shoulder of the shaft where the shaft sleeve
abuts. This will help the shaft pass through the lip seal during shaft installation.
Slide the shaft and assembled bearings into the bearing housing until pump-end bearing rests
against the bottom of the bearing housing. Take care not to cut or fold the bearing housing
pump-end lip seal when installing the shaft.
Press a new bearing cover lip seal into the bearing cover from the open side. Make sure that
the open side of the lip seal case is facing the bearing. Press the lip seal in until it bottoms in
the bearing cover. Apply a coat of grease to the lip of the seal. Slide the bearing cover over the
shaft, taking care not to cut the lip seal on the shaft keyway. Install bearing cover capscrews
and tighten.
SEAL INSTALLATION
Press a new seal plate lip seal into the seal plate with the open side of the lip seal case toward
the seal plate. Press the lip seal in until it bottoms in the bore. This pump may be equipped
with a "rubber bellows" type mechanical seal or a "pusher" type seal. Installation methods are
slightly different for each. The rubber bellows seal can be identified by the elastomer on the
inside diameter of the seal and by the separate, single spring. The pusher-type seal will have no
visible spring and only an o-ring on the inside diameter.
For the rubber bellows seal
Remove the old mechanical seal stationary seat from the stationary seat retainer. Clean
the stationary seat retainer, then lubricate the inside diameter with 30 wt motor oil or similar
(do not use silicone based lubricants or grease). Lubricate the stationary seat o-ring, and press
the seat into the retainer using your thumbs. Clean the seat bore in the seal plate and lubricate
with 30 wt. motor oil. Lubricate the o-ring of the seat retainer, and press the retainer into the
seal plate bore. Make certain that the seat retainer is seated squarely against the bottom of the
seal plate bore and that the stationary seat is seated squarely against the bottom of the seat
retainer. 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.
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