GHS SERIES
OM-05450
PAGE E-7
MAINTENANCE AND REPAIR
The throttle bushing (06AE) is a tight press fit in the
backhead. Use an arbor (or hydraulic) press to re
move the bushing.
B
P
06A,06AA
06B
06AE
Figure E‐4. Standard Flexible Backhead
Housing Assembly (04)
NOTE
Seal cavity pressure relief is accomplished using
socket head pipe plugs (P) in the back side of the
housing. Removal of the plugs is not required un
less the direction of pump rotation is to be
changed.
If pump rotation is to be changed, remove the
socket head pipe plugs (P) from the housing. The
hole adjacent to the discharge port will have a
small pipe plug under the larger, outer pipe plug.
This plug must be removed and relocated to the
suction side of the pump.
PUMP REASSEMBLY
Use caution when handling the idler (02A)
and the rotor shaft assembly (03A). These
parts have sharp edges which will grow
sharper with use.
Cleaning and Inspection
Most cleaning solvents are toxic and
flammable. Use them only in a well ven
tilated area free from flame, sparks, and
excessive heat. Read and follow all pre
cautions printed on solvent containers.
Clean and inspect the pump parts (except the
bearing and seal assembly) with a cloth soaked in
fresh cleaning solvent. Inspect all parts for exces
sive wear or for any nicks or burrs. Remove nicks or
burrs using emery cloth or a fine file. Replace any
parts that are badly worn or damaged.
Rotate the bearing by hand to check for roughness
or binding. If rotation is rough or if there is any side‐
to‐side movement of the inner race, replace the
bearing.
The bearing is permanently sealed and re
quires no additional lubrication except a
coating of light oil on external surfaces to
ease reassembly. External surfaces must
be kept free of all dirt and foreign material.
Failure to do so could damage the bearing
or its mating surfaces.
The bearing tolerance provides a light press fit into
the rotor adjusting sleeve (07AA). Replace the ro
tor adjusting sleeve if the proper fit is not achieved.
Clean and inspect the seal assembly as indicated
in the appropriate section of the
Seal Appendix,
Section F
.
Bushing Preparation
When replacing bushings, lightly oil the O.D. of the
replacement bushing before installation.
Be very careful
when installing graphite
bushings. Graphite is extremely brittle and
will crack if improperly installed. Use a
