DS 19 OPERATION No. DS 314-0 : Checking and adjustments on the clutch control. Op. DS 314-0 172
TOOLS
19 Adjustment of the clutch drag (see Pl. 45).
Accelerate very slowly. The clutch drag should occur between 700 and 750 r.p.m. If not, proceed as follows
a) Stop the engine. Remove the plug (10), loosen the body (11) acting as a locknut and turn the adjusting screw
(12). If the speed of engagement is below 700 r.p.m., screw up the screw and unscrew it if the speed of
engagement is above 750 r.p.m.
b) Tighten the body (11) at the same time holding the screw (12). The position of the head of the adjusting screw
should give a dimension “c” between 17 and 25 mm from the base of the body (11).
c) If the distance “c” is greater than 25 mm, the following may be the cause
- The spring of the control piston (38 mm dia.) is seized or by leakage (too great a clearance between the
piston and cylinder), or the hole in the 38 mm diameter piston is partially blocked.
d) If the distance “c” is less than 17 mm, this can be due to the spring of the control piston (38 mm dia.) being
weak.
e) If the adjustment is unstable, check the operation of the clutch control valve.
ADJUSTMENT OF THE CLUTCH CLEARANCE
Pre-adjustment (see Pl. 45, fig. 1).
20 Put the hydraulic system under pressure, then stop the engine (it will be necessary to run it each time the pressure
falls).
21 Put the starting handle in position and have it turned by an assistant. Untighten the nut (1), unscrew the nuts (2)
and (3). Stop when the engine begins to be turned by the handle. Start the engine. Remove the starting handle
leaving the extension in position. Push the starting handle extension into engagement with the starting dog, it
will be repelled by the dog rotating.
22 Unscrew the nut (1) and retighten the nut (2), move the nuts a fraction of a turn each time. The pre-adjustment
is completed when, without exerting any effort on the starting handle extension, this being pushed into
engagement with the starter dog, it is stabilised without ratcheting over the dog on the primary shaft . . . . . . . 12 mm spanner
Adjustment.
23 Slacken the nut (1) by 1 to 2 turns, so as to obtain a clearance between the nut and the fork of 1 to 2 mm. Tighten
the nut (2) and tighten the locknut (3).
ADJUSTMENT OF THE CLUTCH ENGAGEMENT CONTROL
24 Accelerator control with 2 rods (see Pl. 46, fig. 1).
Stop the engine, press the accelerator right down.
There should now be a clearance at “d” of 1 to 2 mm between the pin (6) and the hook of the spring, with the pin
resting on the lower part of the slot.
If necessary, adjust the length of the Spring by moving its end in the trunnion (7).
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