OM--05450
GHS SERIES
PAGE E--8
MAINTENANCE AND REPAIR
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 graphite bush-
ings
, 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 installation 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.
If the socket head pipe plugs (P) in the
back side of the housing were removed in
order to change the direction of pump rota-
tion, the smaller diameter plug
must
be
installed in the hole adjacent to the dis-
charge port of the housing. Otherwise,
over-pressurization of the seal cavity could
result in premature seal failure.
If the socket head pipe plugs (P) in the back side of
the housing were removed, install the smaller di-
ameter plug in the hole adjacent to the discharge
port, and install one of the larger diameter pipe
plugs over the smaller one. Install the second large
pipe plug in the other hole in the back of the hous-
ing adjacent to the suction port.
Backhead Kit (06
)
(Figures E-1 and E-5)
Position the backhead (06AA) on the bed of an ar-
bor (or hydraulic) press with the rotor end facing
up. Use an arbor (or hydraulic) press to install the
throttle bushing (06AE) in the backhead until fully
seated.
Install a new gasket (06B) against the backhead
shoulder.
BACKHEAD
HOUSING
12 O’CLOCK
3 O’CLOCK
BALANCE HOLE
AT 12 O’CLOCK
Figure E-5. Housing/Backhead
Alignment
Position the balance hole as shown in Figure E-5,
and secure the backhead (06A) to the housing
(04A) with the capscrews (B).
Secure the foot bracket (08A) to the backhead with
the previously removed hardware (B and D).
Rotor/Shaft Assembly (03)
Inspect the rotor/shaft assembly (03A) for exces-
sive wear, scoring or scratches along the shaft
sealing surface. If replacement is required, the
shaft and rotor must be replaced as an assembly.
Small scratches can be dressed with a fine file or
emery cloth. Replace the rotor/shaft assembly or
any other parts if wear or damage is extensive.
Slide the rotor/shaft assembly into the housing and
backhead.
Use caution
not to scratch the I.D. of
the bushing (06AE).
Seal Installation (05)
The seal assembly (05) is available in a variety of
configurations. Check the
Parts List
furnished with
your pump to identify the seal, then refer to
Seal