A. Check splined portion.
Tapered Roller Bearings
A pair of opposed tapered roller bearings
used for the pinion gear bearing to reduce the axial
movement of the gear wh ich especially influences the
tooth contact of bevel gears.
The bearings must be properly preloaded when the
pinion gear assembly is disassembled (Pg. 153).
Visually inspect the bearings for abrasion, color
change, or other damage. If there is any doubt as to
the condition of a
A set of bevel gears
are used to transmit the
engine power from the propeller shaft to the rear wheel
The bevel gears are lapped together as a set at the
factory to get the best tooth
They must be
replaced as a set.
The backlash and tooth contact pattern of the bevel
gears are very important as strength
and qu iet
operation are to be of the best quality. The backlash
and tooth contact pattern of the bevel gears must be
checked and adjusted when replacing any of the parts
which have influence on them.
These patterns are brought out by coating the teeth
with a checking compound.
Visually check the bevel gears for scoring, chipping,
Replace the bevel gears as a set if
either gear is damaged.
Ring gear bearing inspection
Since the ball bearing
in the ring gear assembly
is made to extremely close tolerances, the wear must
be judged by feel rather than by
the ball bearing in a high flash-point solvent, dry it
(do not spin it while it is dry), and oil it. Spin it by
hand to check its condition.
If it is noisy, does not
or has any rough spots, replce the final
bevel gears as a set.
Needle bearings inspection
Visually inspect the bearings
color change, or other damage. If there is any doubt
as to the condition of a bearing, replace it.
Oil seal and grease seal damage
Inspect the oil seals and grease seaI
, @, @,and
replace any if the lips are
dicating that the rubber has deteriorated), hardened,
or been otherwise damaged. Since an oil seal is nearly
always damaged on removal, any removed oil seals must
be replaced. When pressing in an oil seal which displays
manufacturer marks, press it in with the marks facing
outward. Press the seal in so that the face of the seal is
level with the surface of the hole.
When the brake is applied, heat is generated by the
friction between the disc and the brake pads. While
much of this heat is immediately dissipated, some of
it is transmitted to the brake fluid and may raise fluid
temperature to as high as 150°C (300°F) during brake
operation. This temperature could boil the brake fluid
and cause a vapor lock in the lines unless fluid with a
high boiling point is used and has been kept from being
moisture, or a different type
of fluid. Poor quality or contaminated fluid can also
deteriorate from contact with the recommended brake
Brake Fluid Boiling Point
Percentage of Moisture
The graph of Fig.
26 shows how brake fluid con-
tamination with moisture lowers the fluid boiling point.
Although not shown in the graph, the boiling point also
lowers as the fluid gets old, is contaminated with dirt,
or if two different types of brake fluid are mixed.