GHA SERIES
OM--04621
PAGE E--9
MAINTENANCE AND REPAIR
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 bearings by hand to check for rough-
ness or binding and inspect the needles in the
shaft bearing (06AE). If rotation is rough, the
needles discolored or if there is any side-to-side
movement of the inner race of the rotor adjusting
sleeve bearing, replace the bearing(s).
The rotor adjusting sleeve bearing is per-
manently sealed and requires no addition-
al lubrication except a coating of light oil on
external surfaces to ease reassembly.
Shaft bearing needles and all external sur-
faces of both bearings must be kept free of
all dirt and foreign material. Failure to do so
could damage the bearing or its mating
surfaces.
The adjusting sleeve bearing tolerance provides a
light press fit into the rotor adjusting sleeve (07AA).
Replace the rotor adjusting sleeve if the proper fit is
not achieved.
The shaft bearing is a light press fit into the throttle
bushing sleeve. Replace the throttle bushing
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.
NOTE
When installing
high temperature
siliconized
graphite bushings, heat the part that receives the
bushing to 500
_
F and place the bushing in a freezer
for at least one hour. This will allow easier installa-
tion with less chance of breakage.
Housing Assembly (04)
Inspect and clean the housing (04A) with a cloth
soaked in fresh cleaning solvent. Replace it if badly
worn or damaged.
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.
There are two plugs (P) in the back side of
the housing for manufacturing purposes
only. These plugs
must
be in place before
reassembling the pump. Otherwise, dam-
age to the pump and/or pump leakage will
occur.
Backhead Kit (06) Reassembly
(Standard Mechanical Seal Pump Only)
Position the backhead (06AA) on the bed of an ar-
bor (or hydraulic) press with the rotor end facing
up. If removed, use an arbor (or hydraulic) press to
install the bearing sleeve in the backhead until fully
seated.
Position the backhead on the bed of an arbor (or
hydraulic) press with the drive end facing up. If
your pump is equipped with a separate bearing lip
seal (06AT, “R” size pump), press the seal into the
throttle bushing sleeve until fully seated. Press the
shaft bearing (06AE) into the bearing sleeve until
fully seated.
NOTE
Some models are equipped with two shaft bearings
