TM 5-3810-306-34
b. Maximum allowable wear is 0.002in.
NOTE
(0.051 mm). Replace thrust plates if they
are scored, eroded, or pitted.
If plug (22) is replaced, strike new
plug with a prick punch at both ends
c. Check center area of thrust plate where
of screwdriver slot and around
gears mesh. Erosion in this area indicates
edges.
oil contamination. Pitted thrust plates
indicate cavitation or oil aeration.
2. EXAMINE PLUG (22) FOR SECURITY.
Discoloration of plates would indicate
REPLACE IT ONLY IF IT IS DAMAGED.
overheating, probably as a result of
insufficient oil.
CAUTION
5. INSPECT BEARINGS (11).
Ensure double lip seal is fully seated
in recess.
CAUTION
NOTE
If gears are replaced, bearings must
be replaced also.
Wipe off excess sealant.
a. Bearings should fit into bore with a light
3. INSTALL LIP SEAL (24).
press fit, however, a neat hand fit is
allowable. If bearings tend to fall from
a. Coat outer edge of lip seal and its recess
bore, replace housing.
with Permatex Aviation Form-A-Gasket
No.
3 Non-hardening Sealant or
REASSEMBLY:
equivalent. With metal side of lip seal up,
press it into mounting flanges side of the
NOTE
shaft and cover (23) with an arbor press
and lip seal installer (Item 7, Appendix C).
Replace all rubber and polymer seals.
Include all packings, pocket seals
4. INSTALL RING SEALS (10) AS APPLICABLE.
(12) behind thrust plates (13), shaft
seal (24), back-up ring (35) and
NOTE
gasket seals (14).
Notch in ring seal must be visible to
CAUTION
ensure notched side of seal (10) is
next to bearing (11).
When securing pump in a vise, do not
grip on or near machined surfaces.
a. If ring seals are being replaced, insert
them into bottom of drive gear bearing
1. IF BEARINGS (11) HAVE BEEN REMOVED,
bore.
DEBURR BEARING BORES.
CLEAN ALL
PARTS IN A SUITABLE SOLVENT AND DRY
CAUTION
THEM WITH COMPRESSED AIR. WIPE WITH
CLEAN LINT FREE CLOTH.
Use an arbor press only to install
bearings. Do not hammer bearings
into place.
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