GRISWOLD PUMP COMPANY Repair Maintenance Page 27
Installation, Operation and Maintenance Manual
Griswold Model 811
Griswold Pump Company Repair Maintenance Page 29
Locate ends of snap ring so that they do not obstruct the flow of oil through the return
groove. Rotate shaft to make sure that it turns freely.
Oil Slinger is a press fit onto the shaft. Use proper size drive tool to prevent damage.
Power End Assembly – S and M Frame Pumps
Replace all plugs that had been removed during disassembly. Replace sight glass. Use thread
sealant. Replace frame foot.
1. Install outboard bearing (Item 112) on shaft. If bearings are grease lubricated install
single shielded bearing with shield toward the impeller. Bearings can be pressed on the
shaft with an arbor press or, if available, an induction heater can be used. Follow all
instructions and recommendations of the heater manufacturer. When using a press, make sure
that force is applied to the inner bearing race only.
2. Install bearing lock washer (Item 382) on shaft. Place tang of lock washer in shaft
keyway under bearing.
3. Thread locknut (Item 136) onto shaft. Tighten nut with a spanner wrench until snug.
Bend any tang of lock washer over flat on nut. Slide bearing retaining snap ring (Item
361A) over shaft, flat side toward the bearing. Maximum locknut torque values are
shown in the Appendix V, Page 46.
4. Install inboard bearing (Item 168A). If using a press, make sure force is applied on inner
bearing race only. NOTE: If bearing is grease lubricated, it has a single shield. The
bearing is installed with the shield away from the impeller.
5. Install new o-ring (Item 496) on bearing housing (Item 134). Apply a thin coat of oil on
the outside of the bearing and the inside of the bearing housing. Lightly lubricate the
shaft to assist with the installation of the labyrinth seal o-ring.
6. Slide coupling end of pump shaft through bearing housing. Press housing evenly until
bearing seats against shoulder in bearing housing. DO NOT FORCE. Support outer face
of bearing isolator to prevent accidental separation of rotor from stator.
7. Install bearing snap ring (Item 361A) in groove in bearing housing bore.
8. Apply thin film of lubricant to outside of bearing housing (Item 134).
9. Apply thin film of lubricant to frame bore ID. Install shaft assembly into bearing frame
(Item 228). Rotate shaft to make sure that it turns freely.
10. Install cap screws (Item 370C) into bearing frame (Item 228). Install jack bolts (Item
370D) and lock nuts (Item 423). Hand tighten evenly.
11. On M frames, install new gasket in frame face (Item 360D).
Power End Assembly – L Frame Pumps
The L frame is similar to the S and M frames except that the thrust bearing is retained in the
bearing housing by an end cover and screws rather than a snap ring. The thrust bearing is a
duplex angular contact type. It also uses an oil slinger. Replace all plugs that had been removed
during disassembly. Replace sight glass. Use thread sealant. Replace frame foot.
1. If removed, install oil ring (Item 248A) on shaft.
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