6
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,
replaced and sized (see machining instruction on next page).
7. FRONT COVER – 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. LIP SEAL – If seal edge is flat or damaged or elastomer is deteriorated, replace lip seals.
9. MECHANICAL SEAL – If either the carbon or tungsten carbide faces of the mechanical seal are
heavily scratched, scored or blistered, the entire mechanical seal must be replaced.
I. MACHINING
INSTRUCTIONS
The front cover (1) can usually be restored to as-new condition by machining damaged faces. Sleeve
bushings (53) usually require replacement when cover is machined.
To repair damage to face of front cover (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 in a lathe and indicate face (A) and counter bore (B) square and concentric with
respect to bore C within .0008 inch TIR.
3. Machine face (A) deep enough to remove any scored material. Ensure that face is flat within .0008
inch TIR with a 32 micro inch finish.
CAUTION
ATTENTION
Being out of flat in excess of .0008" can cause pump failure.
NOTE:
If more than .015" is machined (removed) from face (A, Figure 2), the same amount should be
machined (removed) from G and F, Figure 2.
4. Press sleeve bushing (53), (54) in from front cover or intermediate cover ensuring that split in
bushing (53), (54) is positioned as shown in Figure 2.
5. Fabricate a bushing sizing tool as shown in Figure 3. Press sizing tool through bushing from same
direction bushing was originally installed to properly size bushing bore.
