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Dismantling
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Before dealing with the axle and bearings,
separate the brake assembly from the brake drurn,
then the brake drum from the wheel hub.
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1971 and later models utilise shock absorber
pads of polyurethane in the hub into which the
shock absorber paddles on the brake drum fit.
Therefore, on 1971 and later models, the hub can be
lifted away from the brake drum without further
dismantling.
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On pre 1971 models, remove the three blanking
plugs from the hub disc and, using a socket wrench,
remove the three sleeve nuts securing the hub to
the brake drum and separate these items. Lift the
brake plate complete with shoes away from the brake
drum.
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SECTION H4
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REAR HUB DISMANTLING
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In order to change the wheel bearings, remove
the wheel complete as described in Section H3. In
the case of pre 1971 rear wheels without shock
absorber, the wheel should be parted from the brake
drum by removal of three extended nuts from the
right hand side. On this type of wheel, illustrated
in Fig. H5 there is no bearing in the brake drum.
The wheel fitted to 1971 and later models should be
removed complete as described in Section H3. With
the wheel axle removed, separate the brake drum
from the wheel hub the "paddles" on the brake drum
are merely a push in fit between the polyurethane
shock absorber segments. On the 1971 type, a double
row ball journal bearing is fitted to the rear
brake drum. The bearing arrangement differs between
1971 and earlier models in the wheels, as will be
seen from Fig. H6, the later wheel containing an
additional double row bearing in the brake drum but
a pair of single row bearings in the wheel hub.
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Pre 1971 models - See Fig. H5.
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To dismantle this type of rear hub proceed as
follows:
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1
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At the speedometer drive box side of the wheel
unscrew the LEFT HAND THREAD lockring using peg
spanner tool, 063965 and remove.
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2
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Take out the distance piece and felt washer.
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3
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Take the rear axle with thick washer and fit
over it the large plated spacer which fits between
the speedometer drive box and fork end.
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4
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Insert the axle with washer and spacer through
the double row ball journal bearing from the brake
drum side of the hub (the brake drum has previously
been removed).
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