OM--04621
GHA SERIES
PAGE F -- 4
SEAL APPENDIX
Seal Removal
(Figures E-1 and F-1)
See
PUMP DISASSEMBLY
and disassemble the
pump up to and including
Rotor/Shaft (03) Re-
moval
.
As the rotor/shaft assembly (03A) is pulled from the
pump, the rotating portion of the seal will remain on
the shaft and the seal stationary element will re-
main inside the throttle bushing sleeve (06AD).
Use a pair of stiff wires with hooked ends to remove
the seal stationary element and O-ring from the
bearing sleeve.
Use caution
not to damage the
stationary element sealing face.
Lubricate the shaft adjacent to the seal and slide
the rotating portion of the seal off the shaft. Re-
move the seal spring.
The hardened steel seal drive pin is pressed into a
hole in the shaft. This pin should not require re-
placement. Consult the factory before attempting
to replace the drive pin.
Continue as required with
PUMP DISASSEMBLY
.
Seal Installation
(Figures E-1 and F-1)
See
PUMP REASSEMBLY
and assemble the
backhead kit (06).
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 flame, sparks, and
excessive heat. Read and follow all pre-
cautions printed on solvent containers.
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.
Seal components
must
be kept clean.
Handle seal parts with extreme caution to
prevent damage. Use care not to contami-
nate the precision-finished faces; even fin-
gerprints on the faces can shorten seal life.
If necessary to clean the faces, use a clean
cloth and wipe in a circular pattern.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak-
age. If any components are worn, replace the com-
plete seal;
never mix old and new seal parts
.
If a replacement seal is being used, unwrap the
mechanical seal components. Check that the seal
faces are clean, undamaged and free of any for-
eign matter.
Position the backhead on a flat surface with the
front end up. Place a clean tissue over the sealing
face of the stationary seat. Align the pins in the
back of the seat with the holes in the bearing sleeve
(06AD) and use thumb pressure to press the sta-
tionary seat and O-ring into the bearing sleeve until
fully seated. Remove the tissue and inspect the
sealing face to make sure that it is clean.
Position the rotor/shaft assembly (03A) on a flat
surface with the drive end facing up. Install the seal
spring over the shaft, making sure it seats squarely
in the groove in the back of the rotor.
Lightly oil the shaft and position the rotating portion
of the seal on the shaft with the sealing face up.
Place a clean tissue over the sealing face of this ro-
tating subassembly and slide it onto the shaft until
the spring retainer seats squarely against the
spring.
Carefully slide the rotor/shaft assembly and rotat-
ing portion of the seal into the backhead until the
sealing faces contact.
Proceed with
Pump Reassembly, Section E
.
