GEARBOX
Gearbox.
—To adjust the primary chain it is possible to swing the Gearbox bodily on
its lower fixing bolt, and to carry this out the following instructions should be observed:—
Slack off the centre nut on the foot gear change mechanism and to tighten the, front
chain first slack off the nut on the adjuster bolt nearest the Engine and turn the nut on the
other side of the anchorage in the same direction, i.e., anticlockwise, until the correct chain
tension is obtained. To ascertain this remove the small inspection disc on the front chain
cover, the tension can then be felt with the fingers. It is most important to leave approximately
a
in. or ½ in. up and down movement. After the correct chain tension has been arrived at,
re-tighten the adjuster nut nearest the Engine and also the centre nut on the gear change
mechanism. Always make a point of adjusting the front chain first and the rear afterwards.
The illustration below shows a similar Pivot mounted gearbox but with hand operated gear
change ; the adjuster referred to, however, is clearly visible.
Should the gear positions of the foot gear change mechanism not correspond to
those of the gearbox index, the short rod between the operating lever on the foot change
mechanism and the striker lever on the gearbox, can be adjusted, as provision is made for this.
To check off the relation between the two first engage any gear and then remove
the split cotter and yoke end pin from the top of the Short Gear Rod ; if the two are correct,
the holes in the Yoke end and the lever coincide ; that is, when the lever is centralised, as a
small amount of free movement always exists in the lever. Otherwise unscrew the locknut
under the Yoke end and bring the Yoke end into line, afterwards tighten the lock nut and
replace the pins, etc. Only a small alteration to the length of the gear control rod is ever
necessary.
Should the Kick-starter return spring ever need replacing, unscrew the Pinchbolt
through the kick-starter crank, draw the crank from the splines, take away the Spring cover
and old spring, enter the end of the new Spring into the Gearbox end cover first, utilise a
pair of pliers to spring the end of the Spring into the locating hole in the Kick-starter Shaft.
To increase the spring pressure move the location of the spring end hole by hole in a clock-
wise direction until the correct tension is obtained.
Replenishment of the gearbox lubricant is very simple and the method fairly obvious.
The filler Plug is situated on the right band side of the gearbox cover plate. Prior to filling
with lubricant remove the level plug, which will be found about half way up on the gearbox
end cover, then fill until the lubricant starts to run from the level hole, afterwards replace the
level and filler plugs.
—11—
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