Primary Chain Lubrication
This has a common oil supply with the gearbox and therefore requires no separate
attention, beyond the instructions for the gearbox.
F
IG
. 7.
Primary drive.
Care of the Rear Chain
It is a good plan periodically to remove the rear chain, clean it thoroughly in petrol or
paraffin, and then gently warm in a mixture of grease and graphite. When cool wipe
off excess grease, clean sprockets and replace chain. Remember when replacing the
chain which is fitted with a detachable connecting link that the spring fastener must
always be put on with the closed end facing the forward direction of travel (i.e. on the
top run) of the chain.
Rear Chain Adjustment
Adjustment of the rear chain involves moving the rear wheel and is described on page
22.
Clutch Control
The clutch adjustment will be found at the left-hand end of the gearbox mainshaft
(see Fig. 8) and it consists of an adjusting pin (C) screwed into the clutch withdrawal
quick thread sleeve and a locknut (B) to secure it in position. This adjusting pin
presses against the clutch withdrawal rod with a steel ball interposed. The
withdrawal mechanism must at all times be so adjusted that there is a slight amount
of play between the pin, the steel ball, and the operating rod, in order to ensure that
the clutch springs may exert their full pressure on the driving and driven plates. If
there is not sufficient play there will be a tendency for the clutch to slip continually
owing to reduced spring pressure, and this in turn will cause over-heating and serious
damage to the clutch itself. If the play becomes excessive difficulty will be
experienced in changing gear, as the clutch may not fully disengage, in which case
the control should be adjusted as explained below.
20
