Gorman-Rupp Pumps 03H3-GR 285579 and up - Manual (Page 27)

OM−01201 0 SERIES
MAINTENANCE & REPAIR PAGE E − 7
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 pump casing drain plug (23) and drain
the pump.
Disconnect the P.T.O. shaft from the gearbox drive
shaft. Remove all the hardware securing the pump
and gearbox to the vehicle chassis. Tie and tag the
any leveling shims used under the casing mount-
ing feet to ease reassembly. Move the pump and
gearbox to a clean, well-equipped shop for mainte-
nance and repair.
Pump Casing and Wear Ring Removal
(Figure 1)
To service the impeller, wear ring or seal assembly,
the pump casing (1) must be separated from the
seal plate (27, Figure 2).
Remove the nuts (13) and separate the pump cas-
ing and casing gasket set (11) from the seal plate.
Tie and tag the gaskets, or measure and record
their thickness for ease of reassembly.
Clean the mating surfaces of the seal plate and
pump casing. Inspect the wear ring (24) for exces-
sive wear or scoring. The wear ring is secured in
the pump casing by a press fit. If replacement is re-
quired, use a small bit to drill two holes through the
ring horizontally, 180
_ apart. Use a saw and chisel
to complete the cuts through the ring, and remove
it from the casing. Use caution not to damage the
pump casing when removing the ring.
Impeller Removal
(Figure 1)
To loosen the impeller screw (21), immobilize the
drive shaft (14, Figure 2). Remove the impeller
screw, lockwasher (22), and impeller washer (19).
Use a suitable puller to remove the impeller from
the shaft. Retain the impeller key (20). Use caution
when removing the impeller; tension on the seal
spring will be released as the impeller is removed.
NOTE
An alternate method of removing the impeller is to
use two large screwdrivers on opposite sides be-
tween the impeller and seal plate to pry the impeller
off the shaft. Use caution not to damage the impel-
ler.
Inspect the seal guard (15) for excessive wear or
scoring. The seal guard is secured on the impeller
by a press fit. If replacement is required, pull it off
the impeller.
Seal Removal and Disassembly
(Figure 1)
Carefully remove the seal spring. Remove the shaft
sleeve (16) and rotating portion of the seal as a
unit. Apply oil to the sleeve and work it up under the
bellows. Slide the rotating portion of the seal off the
sleeve.
Use a pair of stiff wires with hooked ends to hook
the stationary element from the back side, and pull
the element and O-ring from the seal plate bore.
Remove the sleeve O-ring (17).
If no further disassembly is required, proceed with
PUMP AND SEAL REASSEMBLY. If the gearbox
requires disassembly, do not reassemble the
pump components at this time. Refer to GEAR-
BOX DISASSEMBLY and GEARBOX REAS-
SEMBLY, followed by PUMP AND SEAL REAS-
SEMBLY.
PUMP AND SEAL REASSEMBLY
If the gearbox requires disassembly, refer to
GEARBOX DISASSEMBLY and GEARBOX
REASSEMBLY, followed by PUMP AND SEAL
REASSEMBLY.
Seal Reassembly and Installation
(Figures 1 and 3)
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent.
Most cleaning solvents are toxic and
flammable. Use them only in a well-ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent
containers.
The seal is not normally reused because wear pat-
terns on the finished faces cannot be realigned