TCM FD35C9, Workshop Manual

Page: 233 / 291

3-119
Name of component Items to be checked Remarks (cause and others)
(continued from
previous page)
(c) Check for discoloration, undue
wear, or roughness on the gears.
Contaminants in oil, too high oil
temperature (248°F or 120°C or higher),
too frequently idle operations
Useful limit
(d) Check gear teeth for roughness or
pitching.
Irregular rotation at high speeds
(e) Check for missing or broken gear
teeth
Too high oil pressure or a hard object
caught in gear
(4)
Side plate
(a) Check side plate in the gear sliding
area for wear or nicks or scores.
Fine dust between side plate and gears
(b) Check the gears for erosion at or
near the engagement area.
Cavitation or aeration
Useful limit
(5)
Bushing
The bushings are fitted
into front and rear
covers.
Check the inner surfaces of bushings for
roughness or wear.
The bushings are made of copper with
the back plate made of lead brass. The
back plate consists of porous and PTFE
(polytetrafluoro-ethylene) layers.
Useful limit
When the back plate of the bushing is exposed to view.
(6) “E”
Gasket
(a) C h e c k g a s k e t s f o r p r o p e r
installation or cut.
Too high oil temperature
(b) Check rubber parts for swelling. Fire retardant hydraulic oil (phosphate)
or gasoline is used.
(7)
Oil seal
CAUTION
The oil seal might be
damaged when the drive
gear is disassembled
or when it is removed
from the front cover. It
is difficult to locate the
cause of damage when
removing it from the
front cover.
(a) Check oil seal for round or peeled
edge.
Wear occurs due to contaminants in
oil, dust which enters oil due to undue
external negative pressure, or rust due to
moisture.
(b) Check main lip for warping outward. Increased internal oil leaks or high
oil pressure (0.2 – 0.3 MPa or more)
applied on oil seal
(c) Check rubber parts for swelling. Fire retardant hydraulic oil (phosphate)
or gasoline is used.
0.1 mm [0.0040 in.] or less
Wear limit: 0.15 mm
[0.006 in.] or less
These areas
might be worn
Surface port Discharge port
Erosion might
occur here due
to caviation.
LBC surface