DS 19 OPERATION No. DS 334-0 Checking and adjustments on the change speed control. Op. DS 334-0 224
PRELIMINARY CHECKS TOOLS
In the case of difficulty in operating the gears, before removing the gearbox or the hydraulic gear selector, one
should carry out the following checks :
a) Make sure that the following adjustments are correct :-
Adjust the slow running (see Op. DS 142-0).
Adjust the clutch clearance (see Op. DS 314-0, paragraphs 20 to 23).
Adjust the clutch drag (see Op. US 314-0, paragraphs 18 and 19).
Adjust the clutch engagement control (see Op. DS 314-0, paragraphs 24 to 26).
b) Make sure that the hydraulic gear selector and the gear lever are correctly set (see Op. DS 334-1, paragraph 2).
c) If the 2nd gear will not engage (by moving from 1st to 2nd gear) and if 2nd gear jumps out by pressing lightly
on the lever towards the 1st gear position, it is necessary to check the gear lever (play on the rivets assembling
the washers forming the selector gate).
d) Make sure that the distribution of the pressure is correct for each gear.
Raise the front of the car, engine running at accelerated idling. Engage 1st gear and observe the movement of
the clutch fork, it should move slowly towards the rear (engaged position). Proceed in the same manner for the
four other gears.
If the fork remains in the declutched position, it is necessary to carry out the following checks :
CHECKING THE PRESSURE (see Pl. 73).
In order to carry out this operation, use the test bench 2290-T.
Raise the car with a jack.
Remove the air deflection panel. Disconnect the pipe assembly (30) between the gearbox and the hydraulic gear
selector, from the front and rear pipe assemblies of the gearbox.
4 Insert the pipe assembly (P) or (P1) between the flange of the pipe assembly (30) and the flange of the gearbox front
pipe assembly. Connect the assembly on the flange of the gearbox rear pipe assembly by means of the screw (U).
Insert a seal plate between each flange.
Close four of the openings of the pipe assembly (P) or (P1) by means of the plugs (V).
Connect the restricted flowpipe (W) on the fifth opening of the pipe assembly (P).
Connect the other end of the restricted flowpipe (W) to the pressure gauge (M2) or (M3) using the pipe assembly (A). Test bench 2290-T
Start the engine and engage the gear corresponding to that to which the connection is made (on each union of
the pipe assembly (P) or (P1) the number of the corresponding gear is engraved).
The pressure gauge should indicate a pressure between 1920 p.s.i. and 2490 p.s.i. (135 to 170 kg/cm
2
), the
5 needle will pause for a short period at 570 p.s.i. (40 kg/cm
2
) on synchronised gears : (2nd, 3rd and 4th gears).
The gear selector lever being shifted to one of the other synchronised gears, the pressure will drop to zero.
Repeat the operation for the other gears.
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