Gorman-Rupp Pumps 03H1-GX390 1178614 and up - Manual (Page 25)

OM-04728 0 SERIES
MAINTENANCE & REPAIR PAGE E - 7
Remove the nuts (16) and separate the pump cas­
ing and casing gasket set (14) from the intermedi­
ate. Tie and tag the gaskets, or measure and re­
cord their thickness for ease of reassembly.
Clean the mating surfaces of the intermediate and
pump casing. Inspect the wear ring (22) 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 2)
To loosen the impeller (2), tap the vanes of the im­
peller in a counterclockwise direction (when facing
the impeller) with a block of wood or a soft‐faced
mallet. Be careful not to damage the impeller
vanes. Use caution when removing the impeller;
tension on the seal spring will be released as the
impeller is unscrewed.
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (12)
off the engine crankshaft. Tie and tag the shims or
measure and record their thickness for ease of
reassembly.
Seal Removal and Disassembly
(Figure 2)
Remove the spring centering washer (11) and
spring.
Slide the shaft sleeve (13) and rotating portion of
the seal off the shaft 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 seat and O‐ring from the intermedi­
ate bore.
NOTE
The stationary seat and O‐ring may also be re­
moved by disengaging the hardware (18 and 19)
securing the intermediate to the engine and sliding
the intermediate and stationary portion of the seal
seal off the shaft as a single unit. Use a dowel of suit­
able size to press the stationary seal seat and O‐
ring from the intermediate.
Clean the mating surface of the intermediate. In­
spect the wear ring (21) for excessive wear or scor­
ing. The wear ring is secured in the intermediate by
a press fit. If replacement is required, 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 inter­
mediate. Use caution not to damage the inter­
mediate when removing the ring.
PUMP AND SEAL REASSEMBLY
Seal Reassembly and Installation
(Figures 2 and 3)
Inspect the shaft for damage. Small scratches or
nicks may be removed with a emery cloth or a fine
file. If excessive wear exists, the shaft extension
and/or engine will have to be replaced.
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 contain­
ers.
The seal is not normally reused because wear pat­
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If necessary to reuse an old seal in an emer­
gency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shorten seal life. If necessary, clean the faces with a
non‐oil based solvent and a clean, lint‐free tissue.