Dismantling Gearbox
GEARBOX INNER COVER
Gear Operating Quadmt. This quadrant can be inspected for wear on the
teeth while still in position. The freedom of the spindle can also be checked.
It
is,
therefore, unnecessary to remove the quadrant unless
it
requires changing.
To do
this, remove the split-pin and withdraw the spindle.
Replace
it
in the opposite way.
using a new split pin.
Bearing.
Remove the retaining circlip and press the bearing out
;
thoroughly
degrease
it
and dry with compressed air if possible. Check for roughness, pitting,
indentation and end float
;
make sure that the inner race is a tight push
fit
on the
mainshaft. When replacing, heat the cxing and then press the bearing into position.
Re-fit the circlip, ensuring correct engagement in the groove. Liberally oil the
bearing.
Speedometer Drive. Using a soft metal
drift against the spindle gear, gently tap
the drive gear and bush out of its housing. Examine the gear for worn teeth and
check the
fit
in the bush. To replace, fit the thrust washer over the gear spindle
and thread the spindle into the bush. Fit the assembly into the cover, gear first.
Fit the oil seal into the annular groove in the bush and press the bush into position
until the keyway in the bush lines up with the screw hole.
Kickstarter Ratchet and Pinion. This assembly has already been removed to
take off the inner cover. The pinion and ratchet should be checked for chipped or
broken teeth and the spring for fatigue. Replace after the inner cover
is
back in place.
GEAR CLUSTER
Gwrs.
Examine
all
the gears thoroughly for chipped, fractured or worn teeth.
Check the internal splines and bushes. making sure that the splines are free on their
respective shah, with no tendency
to
bind, and the bush in the iayshaft low gear
is
not worn.
GEARgOX CASING
Carnplata and Plunger Assembly.
Unscrew the acorn nut
at
the
base of the
main casing and withdraw the camplate plunger and spring.
Remove the camplate
from the bush.
Make sure that the plunger works freely in
its
housing.
Check
the spring for fatigue. Examine the camplate carefully for signs of wear in the roller
tracks
at
such wear will make gear selection difficult and damage to the gears may
result. Change the amplate if a worn track
is
evident. To replace, tit the camplate
spindle intothe bush and screw the plunger assembly (pointed end engaging the cam)
into the plunger housing. Secure the camplate in the TOP (4th) gear positions
(See Fig.
26).
Chain Sprocket.
Place a smail aluminium block between a sprocket tooth and
the vice, to stop the sprocket rotating, and unscrew the sprocket nut.
It may be
necessary to tap the end of the spanner with
a
hammer to free the nut. Ease away
the sprocket.
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