6
23. Loosen set screw and remove rotating part of mechanical seal (51) from shaft (006)
.
CAUTION
ATTENTION
Take great care not to touch or damage the rotating face of the seal (051). This seal face
is very sensitive to chipping and/or scratching.
24. Remove seal spacer (74) from shaft (6) if applicable.
H. INSPECTION OF PARTS
1. BALL BEARING – Ball bearings should be free turning and quiet. Their grease should have a soft consistency
and not look or smell burned.
2. GEAR FACES – Some light scratching is acceptable, but if there is any scoring, the part should be replaced.
These faces cannot be ground to remove a heavy score mark because their width is critical to performance of pump.
Grinding more than several ten thousandths of an inch will cause low capacity. If the face is not flat, pump
seizure could occur.
NOTE:
Rework other than light stoning or cleaning of gears or gear housings is not recommended. New gear
housings are provided with sleeve bearing factory installed.
3. RING GEAR OD – Light scratching and polishing is acceptable. If scoring is present, ring gear should be replaced.
4. HOUSING
a. Faces – Some light scratching is acceptable, but if there is any scoring, the part should be replaced.
b. Crescent – This piece should be checked for gouges or scoring. If the marking is severe, housing should
be replaced.
c. ID – If any scoring is present, housing should be replaced.
5. SHAFT – Check shaft for wear, particularly areas where lip seals and bushings are located when pump is assembled.
Any heavy wear is cause for shaft replacement. Check edges of keyways for cracks, chipping or rounding. If
any of these exists, shaft should be replaced.
6. SLEEVE BEARING – If scoring or heavy polishing is present, bearing must be pressed out of housing and
replaced and sized. (See machining instructions on next page.)
7. FRONT AND INTERMEDIATE COVERS – If faces are scored or heavily scratched, they must be machined
per machining instructions. Check ball bearing seating area in front cover after severe ball bearing failure. If ball
bearing seating OD is badly scored, deburr it before pump assembly.
8. MECHANICAL SEAL – If either the carbon or tungsten carbide faces of the mechanical seal are heavily
scratched, scored or blistered,
the entire mechanical s
eal must be replaced.
I. MACHINING INSTRUCTIONS
The front cover (1) and intermediate cover (5) can usually be restored to as-new condition by machining damaged
faces. Sleeve bushings (53), (54) and intermediate cover usually require replacement when cover is machined.
To repair damage to face of front cover (see Figure 2 on next page) and to replace sleeve bushings (C) proceed as
follows:
1. Press out sleeve bushing (53), (54) from front or intermediate covers.
NOTE:
If pump is equipped with bronze bearing, consult factory.
2. Place front cover or intermediate cover in a lathe and indicate face (A) and counter bore (B) square and
concentric with respect to bore C within .0008 inch TIR.
