Gorman-Rupp Pumps PA12A60-B-6068H 1435345 and up - Manual (Page 45)

OM-06296 PA SERIES
MAINTENANCE & REPAIR PAGE E - 25
sleeve and a press to reposition the bearings
against the shaft shoulder.
Secure the assembled shaft and bearings by
clamping on the surface between the bearings.
Use caution not to scratch or mar the part number
etched into the shaft in this area. Install the tab
washer (28) and bearing lock nut (27). Torque the
lock nut to 150 ft. lbs. (1800 in. lbs. or 20,7 m. kg.).
Locate the tab on the lockwasher that aligns with a
slot in the lock nut, and bend the tab over into the
slot.
Slide the shaft and assembled bearings into the
pedestal from the drive end until the retaining in­
board bearing (30) seats against the pedestal
bore.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the balls or ball cage.
Press the oil seal (23) into the bearing cap (24) with
the lip positioned as shown in Figure 6. Lubricate
and install a new bearing cap O‐ring (25) and se­
cure the bearing cap with the capscrews (22). Use
caution not to cut or roll the lip of the oil seal when
installing the bearing cap.
Press the oil seal (23) into the bearing cap (35) with
the lip positioned as shown in Figure 6. Replace
the bearing cap gasket (29) and secure the bear­
ing cap with the capscrews (22). Use caution not to
cut or roll the lip of the oil seal when installing the
bearing cap.
Lubricate the pedestal as indicated in LUBRICA­
TION.
Install the sprocket and hub onto the impeller shaft
as follows.
(Figures 6 and 11)
Install the key (31) in the shaft keyway. Align the
keyway in the hub with the shaft key, and slide the
hub onto the shaft with the shoulder positioned to­
ward the pedestal.
Slide the sprocket over the hub, align the mounting
screw holes and install the mounting screws.
Position the hub and sprocket to the dimensions
shown in Figure 11 and torque the mounting caps­
crews to 75 ft. lbs. (900 in. lbs. or 10.4 m. kg.)
Figure 11. Hub and Sprocket Installation
Make certain that the hub and sprocket are
mounted as shown in Figure 11. This is
critical. If the sprocket is not properly posi­
tioned on the shaft, the pump drive belt will
not be properly aligned, which can cause
premature belt or bearing failure.
Pedestal Assembly Installation
(Figure 2)
Use a suitable hoist and sling to position the ped­
estal assembly on the base. Secure the pedestal to
the base using the previously removed hardware.
Install the pump drive belt (56, Figure 2) after as­
sembling the remaining pump components.
To adjust the drive belt tension, find the center of
the belt span between the pump and engine
sprockets. Use a belt deflection gauge to measure
deflection across the width of the belt at this
point. Use the “pusher rods” to adjust belt tension
to 3/8 inch (9,5 mm) of deflection at 30 lbs. (13,6
kg.) of pressure. Do not over‐tighten the drive belt.