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Repair Instructions
To Take the Pump Apart
1. Remove the adapter from the pump shaft, if equipped.
2. File off any burrs on the pump shaft.
3. Using a screwdriver, pry off the bearing cover on the endplate and pump body.
4. Remove the endplate bolts.
5. Support the pump at its ports in a support fixture with the endplate down. Wood blocks may be used. Place on
press bed. Center press on pump shaft and apply pressure to press the pump apart (See Figure 9).
Figure 9
6. With the rollers exposed, remove them. When replacing damaged rollers, always replace the full set.
7. To remove the rotor with shaft from the endplate, support the endplate in a support fixture with the rotor down. Center a
3/8" bolt on pump shaft. Apply pressure to press shaft out of ball bearing (See Figure 9).
8. To remove the ball bearing, place the endplate in a support fixture with the front of the endplate down (See Figure 10).
Center bearing support tool, and slowly press bearing out of casting. Repeat procedure to remove bearing from pump body
(See Figure 10).
9. After removing the ball bearing, check the seals in both endplate and pump body. If wear is evident or leakage has been
noticed, punch the seals out with a screwdriver and hammer. Seals cannot be removed without damaging them.
Figure 10
10. To press the shaft out of the rotor, first carefully wash the rotor and shaft - removing all traces of rust and other foreign
matter. Use steel wool or emery cloth, rinsing parts afterward to wash off all emery dust. Remove the Allen set screw.
Support the rotor in the press through the slot in the base and press shaft through.
While the Pump is Apart
Carefully inspect all parts for wear, such as:
• Undersize or swollen rollers in both length and diameter.
• Worn seals.
• Worn shaft at drive end, and pitted or grooved at the seal area.
• Rough bearings and loss of grease from the bearings.
• Undersize rotor and/or worn roller slots.
• Excessive wear in body - both on inside diameter and at back face.
• Body cracks at the bolt holes and at the o-ring sealing area.
• End wear (body, endplate and rotor).
• Damaged o-ring in the endplate.
After the above parts have been checked and the various points have been considered, decide if the pump is repairable. If repairing
the pump, be sure to inspect inside of endplate. If a groove is noticeable, the endplate should be replaced.
ATTENTION: If an attempt has been made to pry the pump apart with a screwdriver, be sure to file off all nicks, burrs and
other damage marks around the bolt holes.
Re-Assembly
Replace Seals and Bearings
Carefully place the seal in the pump body with crimped side down. Press the seal to the bottom of the
cavity. Then put the bearing in position in the pump body and press into place (Figure 11). Repeat the above
procedure with the endplate. Seat the o-ring in the groove. If necessary, make sure the o-ring stays in
place by stretching it.
Figure 11
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