TCM FD35C9, Workshop Manual

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Inspection
CAUTION
1. Inspections are carried out to locate the cause of troubles and to determine whether parts are
reusable or not. Inspections must be carried out only by personnel with a certain amount of
knowledge and experience in hydraulic equipment.
2. The “useful limit” shown in this section should be used as a rough guide. We do not always
guarantee the performance of a part if it does not reach its useful limit.
Name of component Items to be checked Remarks (cause and others)
(1) Front cover (a) Check for cracks or damage. Oil pressure is too high.
CAUTION
The mating section between the front cover and the pump body looks black
in some parts. This is caused by the friction between aluminum parts and is
not a problem.
(2) Pump body (cast
iron)
(a) Check for cracks or damage. Oil pressure is too high
(b) Check wipe depth or wipe surface. Oil pressure is too high.
Useful limit
Wipe depth limit: less than 0.04 mm [0.0016 in.]
(c) Check for signs of interference
with gear at discharge side.
Runout of gears
Pump’s performance is not affected if
there is a sign of interference.
(3) Drive and driven
gears
(a) Check shaft ends and keyways for
cracks, damage or undue wear.
They might occur when gears are runout
or insufficiently lubricated, or when oil
pressure is too high.
(b) C h e c k j o u r n a l ( i n t h e a r e a
which slides on the bearing) for
discoloration, undue wear, or
roughness.
Contaminants in oil, too high oil
temperature (248°F or 120° or higher),
too frequently idle operations
CAUTION
The shaft might have the following
scratches or scores on its outer
diameter:
(a) T h o s e c a u s e d b y a h a r d
object between the shaft and
bushing.
(b) Those caused by the oil seal’s
main lip
(c) Those caused by the oil seal’s
dust lip
Useful limit
Roughness on journal (a): 0.8S – 1.6S
Roughness on oil seals (b and c): 1.6S – 3.2S
BUSHING
OIL SEAL
INPUT
SHAFT
SIDE PLATE
BUSHING