DS 19 OPERATION No. DS 334-0 Checking and adjustments on the change speed control. Op. DS 334-0 225
TOOLS
REMARK - Before each alteration to the pipe, make sure that the gear lever is in the neutral position.
If for one or several gears, the pressure indicated is not obtained, check the functioning of the hydraulic gear
selector (see paragraphs 6 and onwards, this operation).
CHECKING A HYDRAULIC GEAR SELECTOR
This check can only be carried out when the gear selector is fitted to the car (see Pl. 74).
6 Disconnect the pipe assembly (25) connecting the gearbox to the selector unit from the front and rear gearbox pipe
assemblies (26) and (27).
7 Connect the pipe assembly (P) or (P1) to the flange of the pipe assembly (25). Using the blank flange (D) insert a
seal plate and blank off the outer face of the flange of the pipe assembly (P) or (P1).
8 Fit the end of the restricted flowpipe (W) to one of the holes of the pipe assembly (P) or (P1) and close the four
other holes with the plugs (V).
9 Connect the other end of the restricted flowpipe (W) to the pressure gauge (M3). Use the two pipes (A) connected
together (the pressure gauge (M2) can be used).
10 Start the engine and move the gear lever to the gear corresponding to that to which the connection is made (on
each union the number of the corresponding gear is engraved).
11 The needle of the pressure gauge (M3) should indicate a pressure of between 1920 p.s.i. and 2490 p.s.i.
(135 and 175 kg/cm
2
) (on the synchronised gears, the needle will pause for a short period at 750 p.s.i.
(40 kg/cm
2
). The gear selector lever being moved to another synchronised gear, the pressure should
drop to zero.
12 Repeat the operation on the four other holes of the pipe assembly.
IMPORTANT - Put the gear selector lever in the neutral position, before disconnecting the pressure gauge.
CHECKING FOR LEAKAGE FROM THE GEAR CONTROL CYLINDERS (see Pl. 75).
13 Remove the pipe (W). Prepare the test bench as indicated on Pl. 172.
Replace the pipe (A) by the pipe (B) and connect it to one of the unions of the pipe assembly (P) or (P1).
Disconnect the pipe assembly (30) and seal the outer face of the flange of the pipe assembly (P) or (P1) using
the blank flange (D).
Insert a seal plate.
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