On rigid frame models it will be found easier to re-fit the wheel to the fork ends with
the brake cover plate hanging free and then, holding the wheel on its left-hand side, as
far forward in the fork end as is possible, to swing the right-hand side backwards, lifting
up the free cover plate so that the slot in it is positioned to engage with the square
headed anchor bolt and then swinging the right-hand end of the axle forwards till engage-
ment has been completed.
After re-fitting the rear wheel, check the rear chain adjustment, and, if necessary, re-set it.
Then check the rear brake adjustment and, if necessary, re-set it. Also check that brake
cover plate anchorage is correct (see illustration 20.)
WHEEL BEARINGS AND ADJUSTMENT
The wheel bearings are of taper roller type. See illustrations. The outer cups for the
rollers are pressed into the hub shell. They have a fixed location one side and an adjustable
location on the other. The fixed location is provided by a circlip in a groove cut in one
end of the hub shell, while the adjustable location is regulated by a screwed ring that is
threaded into the opposite end of the hub and the position of which can be locked by an
encircling nut.
On all wheels the adjusting ring is located on the right-hand side.
It is rarely necessary to make adjustment to wheel bearings. It is most important they
are not adjusted too tightly as this would quickly ruin them. There must always be a
(light amount of end play. This should be about .002", which represents a just perceptible
rim rock. (Not more than 1/64" rock.)
A service method of ensuring correct adjustment is :
Slacken the lock nut.
Tighten the adjusting ring until all slackness has been taken up.
Slacken back the adjusting ring exactly one-half turn.
Tighten the lock nut, making sure that, when doing so, the adjusting ring does not creep
round and that the cover disc is positioned to permit grease gun application to the
nipple.
TO DISMANTLE FRONT WHEEL BEARINGS
Remove wheel from machine.
Remove nut securing brake cover plate, withdraw cover plate with brake shoes, etc.
Then remove brake cover positioning nut and washer.
Then turn to the right-hand side of wheel, remove adjusting ring lock nut and lift off
cover disc.
Then completely unscrew the adjusting ring.
Now carefully apply pressure to the threaded end of the wheel spindle which will eject
from the opposite end of the hub, the washer (7), oil seal (8) and oil seal cup (9) together
with the bearing outer ring (6). The wheel spindle with its two sets of rollers in cages
may now be lifted out leaving in situ only the fixed bearing ring together with the oil
seal, washer and cup for that side bearing.
If it is desired to remove these pressure is first applied to the visible washer, by which
the assembly is forced inward sufficiently to permit extraction of the retaining circlip,
after which through the medium of a mandrel or a piece of tubing of external diameter,
a trifle smaller than the hub bore, apply pressure to the inner edge of the fixed bearing
ring so that it is forced out of the hub end. As it emerges it will push out the end
washer (2), the oil seal (3) and the oil seal encircling collar (4) and the inner washer (5).
To refit reverse the above procedure remembering that after bearing ring (6), washer (5),
spacer (4), oil seal (3) and washer (2) have been inserted, to refit the circlip (I) snugly
in its groove and to then apply pressure to the inner edge of the bearing ring to force
the assembly tightly back against the retaining circlip.
Finally, position the disc when tightening the adjusting ring lock nut so that access to the
grease nipple is possible.
63
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