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1971 and later models - See Fig. H6.
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With the exception that the later rear hub has
two single row ball journal bearings in the hub,
rather than a single row bearing at the lockring
(speedometer) side and a double row bearing at the
brake drum side, the dismantling and reassembly
details are the same as for the previous wheel.
Later models incorporate shock absorber segments in
the hub and to ensure rigidity of the wheel a
double row bearing is incorporated in the brake
drum itself. The brake drum bearing is dealt with
separately.
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SECTION H5
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REAR HUB REASSEMBLY
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Prior to reasembly, clean and inspect the
bearings, felt seal and seal retainers for
roughness, wear, damage or corrosion and make
replacements as necessary. Procced as follows:
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Pre 1971 models
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1
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Pack bearings with the recommended grade of
grease (see Section K1).
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2
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Fit the single row bearing into the threaded
(lockring) side of the hub, sufficiently to allow
the lockring to be fitted.
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3
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Fit the felt seal and locking ring and tighten.
Remember that the lockring is LEFT HAND threaded.
Tighten with peg spanner tool 063965. If the peg
spanner is not available, take special care not to
damage the slots which drive the speedometer drive
box.
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4
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Fit the bearing spacer tube. On pre 1971 models
which have a double row bearing at the brake side
and a single row bearing at the speedometer drive
box side, the bearing spacer has unequal length
ends and the long end locates to the single row
bearing.
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5
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Press the brake drum side bearing (on pre 1971
models a double row and on 1971 and later models, a
single row bearing) squarely into position in the
hub and drive home applying load only to the outer
race. Load on the centre race can cause damage.
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6
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Fit the felt retaining washer, felt seal and
dished washer and on pre 1971 models, lightly peen
the dished washer into position. 1971 and later
models use a push in washer.
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The brake drum and sprocket contain the dummy
axle and, in the case of 1971 and later models, the
double row bearing and sealing felt. The bearing
can be removed and refitted to the later brake drum
and sprocket as detailed below.
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1971 and later models
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The later type of rear wheel incorporating a
shock absorber is supported by two single row
bearings in the hub and a double row bearing in the
brake drum. The brake and brake drum are separated
from the swinging fork as detailed in Section H3.
To remove and replace the double row bearing and
seals, proceed as follows:
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1
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Lift the brake assembly away from the drum.
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2
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Remove the bearing spacer (the shouldered spacer
protruding from the centre of the bearing towards
the wheel). This will be a relatively tight fit
into the bearing and may need to be gripped in a
vice whilst the brake drum is tapped carefully away
from it.
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3
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Prise out the lipped washer covering the felt
seal.
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4
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Collect the felt seal and felt retaining washer.
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5
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Using circlip pliers, remove the large bearing
retaining circlip.
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6
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Using a hide hammer or mallet, drive the
threaded end of the dummy axle. This should pass
into the brake drum, displacing the inner felt seal
and retainers and driving the double row bearing
clear.
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7
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Clean, inspect and replace as necessary the
bearing, seals and retainers. Check that the shock
absorber "paddies" are secure in the brake drum.
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8
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Pack the bearing with the recommended grade of
grease (see Section K 1 ) .
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9
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Fit the inner washers to the brake drum, holding
in place by inserting the dummy axle, threaded end
through towards the brake side.
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