will be concentric with the brake drum, with immediate efficiency, pro-
viding the brake drum is not badly scored.
The brake drums are not detachable.
If braking efficiency is impaired by reason of over greasing the wheel
hub, the brake shoes should be de-greased and not treated with petrol or
paraffin, which only tends to make the grease more fluid.
Contrary to general belief, a smooth surface on the brake linings gives
the best braking.
Centralizing the brake shoes. If the rear wheel and the brake cover plate
has been disturbed, when the wheel is refitted leave the spindle nut
043303 and lock nut 043305 slightly loose.
Press hard on the rear brake pedal, tighten the lock nut whilst pressure
is maintained.
The fact of opening out the spindle hole in the cover plate to the extent
of
Q" will ensure centralization.
Brake squeal. Check linings and drum for dust from linings. Centralize
brake shoes or fit new type rear brake expander lever 043419, which will
also improve braking efficiency.
Wheel bearings (Lightweight Models). Two journal bearings at each end
of the hub are a press in fit. The bearings are greased when assembled.
The bearings should be cleaned and re-greased every 4,500-5,000 miles.
Use grease of the anti-centrifuge type for these bearings.
If wear develops on the right-hand front wheel bearing, entry of water
is the cause. Fit the new water excluder 043420 to shroud the bearing.
Discard cover 043282 and spacer 043358.
Wheelbearings (250 c.c. Scrambler). Taper roller bearings similar to those
used on the Heavyweight Models are fitted to both wheels. The outer cups
are pressed into the hubs.
These bearings rarely need adjustment, providing grease is applied via
the nipples on the hub, say every 1,000 miles.
For service details see Heavyweight Models.
Speedometer gear box lubrication. Where a grease nipple is not fitted,
periodical lubrication is not necessary as the drive parts are made from
self-lubrication material. A little oil on the seal is beneficial when the
drive is removed from the wheel.
1
2
3
4
5
6
7
8
Spindle, front wheel
Washer, front wheel spindle
(350 c.c. only)
Lever, brake shoe expander
Nut, brake shoe expander lever
Washer, brake shoe expander
lever
Spacer, hexagon, front cover
plate
Cover, front brake plate
Brake shoes, pair
9
10
11
12
13
14
15
16
17
18
Enclosure cup, oil seal
Seal, felt, for bearing
Washer, bearing felt seal
Bearing, for hub
Spacing tube, bearing
Pressing, spacing tube
Seal, rubber, for bearing
Enclosure cap
Spacer, front spindle
Nut, front spindle
1960-62 front hub assembly
Key to
FIG
30
99
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