4. Press Seal from Pump Body or from the Pump
Casting Containing the Seal
(SEE FIGURE 3) The seal is a press fit in the pump body
or adapter. To press out, place body flange down on flat sur-
face exposing motor or bracket end of seal. Press seal
through into impeller chamber - DO NOT attempt to press in
other direction as seal has a seating flange. Clean the bore in
the pump body from which seal was removed. Remove all
hardened residue. Do not gouge or damage seal bore. (SEE
FIGURE 4) On some pedestal pump models (70P & 800B),
it is not possible to press out the seal without first pressing
out the shaft and bearing assembly. In such cases, it is possi-
ble to collapse and pry out the seal while leaving the shaft
and bearing assembly in position.
5. Press New Seal into Pump Body
( SEE FIGURE 5) Coat bore with Permatex #2®, Teflon®
paste, Locktite 620®, or equivalent sealer to press-in. Use
bushing type pusher to press and press only on metal flange
of seal DO NOT press on spring loaded carbon face. DO
NOT damage or scratch lapped carbon face. A scratched sur-
face will cause seal to leak.
6. Remove Seal Wear Face from Impeller
(SEE FIGURE 6) If lapped wear face projects above
impeller, use pliers to pry out. If wear face does not project,
use knife or sharp instrument to pry out.
7. Install New Seal Wear Face
Coat wear face (and seal seat) with liquid soap and push
into impeller chamber with finger pressure. DO NOT damage
or scratch wear face surface.
8. Reinstall Pump Parts
Reinstall pump parts to motor adapter or to motor and
pedestal bracket or adapter in reverse order as follows:
1. Slide pump body on motor adapter or bolt
pedestal bracket or adapter to motor.
2. Thread impeller onto shaft. Be sure to replace any
spacer shims used originally for impeller
positioning.
3. Clamp pump body to motor adapter by single
draw down bolt. A rotating clearance should remain
between body or cover and impeller.
4. Reinstall gasket, or o-ring and pump cover.
9. Check for Impeller Interference
Check that the impeller does not interfere with pump
body or cover by rotating impeller by hand or jogging the
motor. Metallic noise is a sign of interference. To eliminate
interference noise, reposition the impeller to better center it
in the body chamber and provide rotating clearance. Do this
by adding or removing spacer shims onto motor shaft.
10. Impeller Shimming
Since jet pump motor shaft projections can vary, pump
heads are provided with impeller shim kits. In general, an air
gap of 0.010” to 0.015” is recommended between the rear
shroud of the impeller and the motor adapter face. Once the
pump casing is mounted, check to be sure that the impeller is
not rubbing against the casing. Adjust shimming as needed.
315-437-0361 or 800-448-1668
Fax: 315-463-9561
web: www.oberdorfer-pumps.com
FIGURE 4
FIGURE 5
FIGURE 6
FIGURE 3
rev. 02/08
