Instruction manual

has no other source of escape but past this sleeve and the adjacent small metered bleed
hole. This intentionally restricted passage causes a considerable damper effect to the
recoil action. It will thus be gathered that on the shock movement of the fork, slight
damper action occurs, with a greatly increased damper action on the reverse movement,
both actions automatically increasing in effect the more violent the movement. Before
concluding this description, it should be mentioned that upon a very violent impact, as a
result of which the main springs are almost fully compressed, the damping of the upward
movement of the sliders is intentionally increased by the automatically greatly restricted
passage for the displaced oil, brought about by the lower ends of the main tubes encircling
the tapered enlarged ends of the damper tubes as the sliders near the limit of their up-
ward movement. Thus bottoming is prevented, no matter how violent the impact. For
ordinary purposes the recommended oil content is 6½ ozs. (184·6 c.c.) each leg of one of
the S.A.E. 20 oils specified. To deal with heavier loads than normal, the oil content may
be increased to a permissible maximum of 10 fluid ozs. (284 c.c.) per leg. To increase
damping oil of heavier grade may be used. It will be found, however, that for normal
purposes the recommended grade and quantity of oil will give the most comfortable ride.
FRONT FORK " TOPPING UP "
No part of the TELEDRAULIC Front Fork requires individual lubrication, but it is
advisable to check the oil content, once every five thousand miles. The normal content
as already stated, is 6½ fluid ounces (184·6 c.c.) each side.
Support motor cycle vertically with weight on both wheels. A steady under each foot-
rest is the best method.
Unscrew the hexagonal plugs at top of fork inner tubes. These are on level with handle-
bars and attached to them are the damper rods. Have a graduated measure of not less
than 10 fluid ozs. capacity available in which to catch and measure the oil. Remove the
drain plug from the bottom of a slider and catch the oil which drains out. Then reinsert
drain plug and work the top plugs to which damper rods are attached up and down
(pumping action), making upward strokes as violent as possible but using only fingers to
do so. This pumping action is to eject any oil trapped in the damper tubes above the
damper disc valve. Wait two minutes and again remove drain plug. Repeat the action
until no further oil can be drained off when, if the fork had the correct oil content, about
6 fluid ozs. (170·4 c.c.) will have been drained off. If less, add to make this quantity, or
reduce if an excess quantity has been drained off. Next refit drain plug and carefully
pour into the top of the tube being checked exactly 6 fluid ozs. (170·4 c.c), after which
the top plug may be replaced.
NOTE—Although the normal oil content of each side is specified as 6½ fluid ozs., it is not
possible to drain all the oil via the drain plug. This explains the lesser quantity
of 6 fluid ozs. (170·4 c.c.) referred to above. However, if the fork is at any time
completely dismantled and then reassembled in a dry state, it should be noted
that in that event the correct quantity of oil to add to each leg is 6½ fluid ozs.
(184·6 c.c).
TO REMOVE THE COMPLETE FRONT FORK ASSEMBLY
Support the machine with the front wheel clear of the ground. (A box, of suitable
height, under each footrest is the best method.)
Remove front wheel by method described in Wheel Section.
Remove front stand and front mudguard.
Detach the switch panel that is held to the top of the head lamp by three screws.
Disconnect speedometer driving cable from the speedometer head.
Detach the speedometer light bulb with its holder.
Remove the two bolts retaining the head lamp and take same away.
Remove the two nuts retaining the speedometer head and take same away.
Remove the handlebar half clip and lay the handlebars, complete with controls, upon a
pad on top of the petrol tank.
Detach the front brake cable from the forks. (First remove the slotted yoke end and
then completely unscrew the cable adjuster.)
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