OM-05845
GHC SERIES
PAGE E-8
MAINTENANCE AND REPAIR
small pipe plug under the larger, outer pipe plug.
This plug must be removed to change rotation.
If the direction of pump rotation is
changed, the position of the pressure relief
valve (10A) must also be changed to con
tinue to provide pressure relief for the new
configuration. Otherwise, the pressure re
lief valve will not function, which could re
sult in damage to pump and/or injury to
personnel.
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.
Clean the bearing in fresh cleaning solvent and
coat with light oil.
Rotate the bearing by hand to check for roughness
or binding. If rotation is rough or there is any side‐
to‐side movement between the inner and outer
races, 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
press to install the bushing with one contin
uous motion until the bushing is fully
seated. Stopping in mid‐stroke will cause
the bushing to crack. After installation,
check the bushing for cracks.
Housing Assembly (04)
Inspect and clean the housing (04A) 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 flame, sparks, and
excessive heat. Read and follow all pre
cautions printed on solvent containers.
