Gorman-Rupp Pumps PA12A60-B-6068H 1435345 and up - Manual (Page 41)

OM-06296 PA SERIES
MAINTENANCE & REPAIR PAGE E - 21
Tension on the pump drive belt (56) is obtained
through the use of “pusher rods” used to move the
pump and pedestal side‐to‐side. To remove the
pedestal, loosen the outer hardware on the
threaded rods. Unscrew the jam nuts until they en­
gage the adjusting brackets. Continue to unscrew
the jam nuts in an alternating sequence to “push”
the pedestal assembly toward the pump sprocket
(58). When sufficient clearance is obtained, re­
move the pump drive belt from the engine sprocket
(14, Figure 9).
Remove the hardware securing the pedestal to the
base. Use a suitable hoist and sling to remove the
pedestal assembly.
Pump Shaft and Bearing Removal and
Disassembly
(Figure 2)
When the pump is properly operated and main­
tained, the pedestal should not require disassem­
bly. Disassemble the shaft and bearings only
when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.
The sprocket and bushing (57 and 58) must be re­
moved from the drive end of the shaft before disas­
sembling the pedestal (20, Figure 6). To remove
the sprocket, remove the screws securing the
sprocket to the hub, then reinstall the screws in the
tapped holes in the sprocket. Tighten the screws in
an alternating sequence to press against the hub
shoulder and “jack” the sprocket off the hub.
With the sprocket removed, the hub can be pulled
or pried off the shaft. Remove the shaft key.
(Figure 6)
Before disassembling the pedestal, remove the
pedestal drain plug (21) and drain the oil from the
pedestal. Clean and reinstall the pipe plug.
Disengage the capscrews (22) and and remove
the outboard bearing cap (24), O‐ring (25) and oil
seal (23). Remove the bearing shims (26). Press
the oil seal from the bearing cap.
Straighten the tab on the washer (28) securing the
bearing lock nut (27). Use a spanner wrench to re­
move the lock nut. Remove the tab washer.
Disengage the capscrews (22) and remove the in­
board bearing cap (35) and oil seal (23). Remove
the bearing cap gasket (29) and clean the mating
surfaces. Press the oil seal from the bearing cap.
Place a block of wood against the impeller end of
the shaft (32) and tap the shaft and assembled
bearings (30 and 34) out of the pedestal.
After removing the shaft and bearings, clean and
inspect the bearings in place as described in
Bearing Cleaning And Inspection.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the pedestal.
Replace the bearings, shaft, or pedestal if the
proper bearing fit is not achieved.
If bearing replacement is required, remove the re­
taining ring (55) and use a bearing puller to remove
the inboard and outboard bearings from the shaft.
Engine Drive Disassembly
(Figure 9)
This engine is equipped with a jackshaft type drive
assembly as shown in Figure 9.
To remove the sprocket (14), remove the caps­
crews securing the taperlock bushing (15) to the
sprocket. Reinstall the capscrews in the tapped
holes in the bushing and use a suitable puller to
pull the bushing and sprocket off the output shaft
(4). Retain the key (13).
Further disassembly requires separating the re­
maining drive components from the engine. Re­
move the hardware (not shown, supplied with the
engine) securing the bearing housing (16) to the
engine. Pull the shaft and bearing housing straight
away from the engine. The rubber drive element of
the coupling (11) will separate from the drive ring
secured to the engine flywheel with the hardware
(7 and 8). Disengage the hardware to remove the
drive ring from the flywheel.
To remove the flexible portion of the coupling from
the output shaft, unscrew the two allen head set­