TRUCK SERVICE MANUAL
TRANSMISSIONS
HT 700D SERIES TRANSM I SS IONS
Para 4-5/4-6
such defects with crocus cloth or a soft stone. If
or excessively worn, replace it, using the proper size
scratches are deep, replace the defective part.
replacer.
CAUTION
(4) Inspect threaded openings for damaged threads.
When a defective bushing is removed, care should be
Chase damaged threads with the correct size
exercised to prevent damage to the bushing bore.
used tap (a new tap can cut oversize).
(2) Inspect thrust washers for distortion, scores,
(5) Replace housings or other cast parts that are
burs, and wear. Replace the thrust washer if it is
cracked.
defective or worn.
(6) Inspect all machined surfaces for damage that
could cause oil leakage or other malfunction of
h. Inspecting Oil Seals, Gaskets
the part. Rework or replace the defective parts.
(1)
Inspect sealrings for cuts and hardness.
Replace sealrings if these defects are found.
f. Inspecting Bearings
(2)
W he n replacing metal-encased, lip-type oil
(1) Inspect bearings for roughness of rotation.
seals, the lip side must be toward the oil to be
Replace a bearing if its rotation is still rough after
sealed in (toward the inside of the unit). Use a
cleaning and oiling.
nonhardening sealing compound on the outside
(2) Inspect bearings for scored, pitted, scratched,
diameter of the seal to help prevent oil leaks.
cracked, or chipped races, and for excessive
Coat the inside lip of the seal with high-
wear of rollers or balls. If one of these defects is
temperature grease to protect the seal during
found, replace the bearing.
shaft installation and to p r o v i de lubrication
(3) Inspect the defective bearing housing and shaft
during initial operation.
for grooved, burred or galled conditions that
(3)
Replace all composition gaskets.
would indicate that the bearing had been turning
(4)
I n s p e c t hook-type sealrings for wear, broken
in the bore or on the shaft. If the damage cannot
hooks, and distortion.
be repaired with crocus cloth, replace the
(5)
Installa new hook-type sealring if the ring shows
defective part.
any wear on the outside diameter, or if there is
(4) When installing a bearing on a shaft, heat the
excessive side wear.
bearing to 2000F (930C) in an oil bath
(6)
The sides of the sealring must be smooth (0.
(approximately 30 minutes). Use the proper size
005-inch (0.13 mm) maximum side wear). The
installation sleeve and a press to seat the
sides of the shaft groove (or the bore) in which
bearing.
the sealring fits should be smooth (50
(5) If a bearing must be removed or installed without
microinches (1. 27 um) equivalent) and square
a sleeve, press only on the race which is
with t h e axis of rotation within 0.002 inch (0.05
adjacent to the mounting surface. If a press is
mm). If the sides of the grooves have to be
not available, seat the bearing with a drift and
reworked, install a new sealring.
hammer, driving against the supported race.
i. Inspecting Gears
g. Inspecting Bushings, Thrust Washers
(1) Inspect gears for scuffed, nicked, burred, or
(1) Inspect bushings for scores, burs, roundness,
broken teeth. If the defect cannot be removed
sharp edges and evidence of overheating.
with a soft stone, replace the gear.
Remove scores with crocus cloth. Remove burs
and sharp edges with a scraper
or knife blade. If bushing is out-of-round, deeply scored,
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