JS SERIES PUMPS
MR−03955
FM
APPROVED
MAINTENANCE AND REPAIR
PAGE C − 8
PUMP END REASSEMBLY
Installing Upper Seal Assembly
References are to Figure C−2.
If a new seal is being installed, do not un-
wrap it until ready to install; seal compo-
nents
must
be kept clean. Handle seal
parts with extreme caution to prevent dam-
age. Use care not to contaminate the preci-
sion-finished faces; even fingerprints on
the faces can shorten seal life.
NOTE
Use hand pressure only to install seal components.
A push tube cut from plastic pipe approximately the
same O.D. as the stationary seat is a useful aid
when installing these components. It is recom-
mended that the pump be inverted during seal as-
sembly.
LOWER BEARING
HOUSING
STATIONARY
SEAT
SPRING
RETAINER
SEAL
HOUSING
STATIONARY
SEAT
SPRING
RETAINER
SPRING
RETAINING
RING
O-RING
O-RING
ROTATING
ELEMENT
DRIVE
SCREW
O-RING
SEAL CLAMP
LOCKING RING
O-RING
ROTATING
ELEMENT
RETAINING
SCREW
UPPER
SEAL
ASSEMBLY
LOWER
SEAL
ASSEMBLY
Figure C−3. Seal Assemblies
1. Inspect the end of the shaft for scoring or key-
way damage. Remove nicks and burrs with a
fine file or emery cloth, and restore original con-
tours. Clean the shaft of all grit and filings.
2. Lubricate the motor shaft and the seal cavity of
the lower bearing housing (213). Replace the
bearing housing O-ring (251).
3. Unwrap the seal components. Check that the
seal faces are clean and undamaged. If neces-
sary to clean, use a clean tissue and wipe in a
concentric pattern.
4. Lightly oil the seal stationary seat O-ring and in-
stall it in the bearing housing. Place a clean tis-
sue over the stationary seat seal face, and
press it into the bearing housing with the seal
face up.
5. Install the rotating element and O-ring on the
shaft flush against the stationary seat.
6. Place a spot of grease in the cups of the spring
retainer to hold the springs in place, and install
the springs in the cups. Make certain that the
springs are in place, and install the spring re-
