DS 19 OPERATION No. DS 334-0 Checking and adjustments on the change speed control. Op. DS 334-0 226
TOOLS
14 Tighten the bleed screw (b). Operate the pump in order to build up the pressure to 2490 p.s.i. (170 kg/cm
2
). Check
the pressure gauge which should not show a drop in pressure.
Release the pressure by unscrewing the bleed screw (b) on the test bench.
15 Repeat the operation on the four other unions of the pipe assembly (P) or (P1).
If there is a drop in pressure, the joint of the cylinder being tested is defective and it will be necessary to replace
it or to replace the pipe assembly.
CHECKING THE GEAR OPERATION (see Pl. 75).
16 With the engine stopped, put one front wheel on the ground (the other being already raised). Engage the clutch by
using the auxiliary clutch control.
The test pipe (B) being connected to one of the unions of the test pipe assembly (P) or (P1), tighten the bleed
screw (b) and operate the pump.
During this period, have the wheel turned by hand by an assistant. When the wheel can no longer be turned, the
gear is engaged. At this moment, read the pressure indicated by the pressure gauge. This pressure should be
less than 711 p.s.i. (50 kg/cm
2
).
Release the pressure by unscrewing the bleed screw (b).
17 Carry out the operation successively on the four other unions of the pipe assembly (P) or (P1).
REMARK - If on one of the gears of the gearbox, the speed does not change for a pressure less than 711 p. s. i. (50
kg/cm
2
), it may be caused by pipe assembly stoppage, defective gearbox cover or a defective synchromesh.
18 Release the pressure by unscrewing the bleed screw (b).
Remove the pipe assemblies (A) and (B).
Remove the blank flange (D), disengage the pipe assemblies (P) or (P1).
Connect the pipe assembly (30) to the front and rear pipe assemblies.
Insert the seal plates.
Fit the air deflection panel.
Put the auxiliary clutch control in the “running” position.
TO ADJUST THE PIPE ASSEMBLY CONTROLLING THE GEARS (in the case of a replacement
pipe assembly (see Pl. 55).
To adjust the pipe assembly of the front cylinders.
19 Push the piston to the bottom of the cylinders on the pipe assembly removed and on the new pipe assembly.
20 On the 3rd speed cylinder, check the position of the piston in relation to the bearing face of the cylinder on the
cover (see fig. 7). To do this : place a bush about 20 mm long on the cylinder, using a depth gauge, measure Bush:
the dimension “d” between the face “x” of the bush and the end of the piston, for example : “d” = 15. 5 mm Internal dia. = 16 mm
External dia. = 22 mm
Length 20 mm
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