Gorman-Rupp Pumps 04E1-GHH 1076270 and up - Manual (Page 36)

OM−03688 0 SERIES
MAINTENANCE & REPAIR PAGE E − 11
specialized equipment such as a transmis-
sion jack with custom brackets should be
used to lift and position the pump and
gearbox.
Close all valves in the suction and discharge lines.
Remove the casing drain plug (21), and drain the
pump. Clean and reinstall the drain plug.
Remove the suction piping. Remove the hardware
securing the pump discharge flange to the vehicle
tank.
Remove the hardware securing the input and out-
put drive flanges to the drive shafts. Disconnect the
air lines from the air shift cylinder assembly on the
gearbox.
Remove the hardware securing the gearbox to the
rear cross member. Remove the hardware secur-
ing the trunnion to the front cross member.
Move the pump and gearbox to a clean, well-
equipped shop for maintenance and repair.
Suction Head and Wear Ring Removal
The wear ring (22) and impeller (2) are easily ac-
cessible and may be serviced by removing the suc-
tion head (24).
Remove the nuts (28), and pull the suction head
and wear ring out of the pump casing. Remove the
suction head gasket (26).
Use caution not to damage the suction
head when removing the wear ring (22).
Inspect the wear ring for excessive wear or scoring.
If replacement is required, use a chisel or other
suitable tool to cut it from the suction head. Be
careful not to damage the suction head bore.
Impeller Removal
To remove the impeller, block impeller rotation by
inserting a brass rod through the pump discharge
and between the impeller vanes. Use caution not
to damage the impeller. Remove the impeller nut
(23).
Install 1/4−20 UNC by 4-inch long capscrews in
the tapped holes in the impeller, and use a suitable
puller to remove the impeller from the shaft. Use
caution when removing the impeller; tension on
the seal spring will be released. Retain the impeller
key (25).
Remove the impeller adjusting shims (20). For
ease of reassembly, tie and tag the shims, or mea-
sure and record their thickness.
Seal Removal
Remove the seal spring. Lubricate the shaft adja-
cent to the seal, and work oil up under the rubber
bellows. Slide the rotating portion of the seal off the
shaft.
Use a pair of stiff wires with hooked ends to remove
the stationary element and O-ring from the casing
bore.
Pump Casing Removal
The presence of gearbox lubricant in the seal cav-
ity behind the stationary element indicates failure
of the gearbox oil seal (14). Before attempting to re-
move the seal, remove the gearbox drain plug and
gasket (63 and 64, Figure 2A) and drain the gear-
box lubricant. Reinstall the drain plug and gasket.
If the oil seal, wear ring (19), O-ring (12) or gasket
(18) require replacement, or if the gearbox is to be
disassembled, remove the nuts (17), and slide the
pump casing off the shaft.
Remove the O-ring and gasket (12 and 18). Use a
set of screwdrivers or other suitable tools to pry the
oil seal (14) from the back of the pump casing.
Use caution not to damage the pump cas-
ing when removing the wear ring (19).
Inspect the wear ring (19) for excessive wear or
scoring. If replacement is required, use a chisel or
other suitable tool to cut it from the pump casing.
Be careful not to damage the pump casing bore.