DS 19 OPERATION No. DS 00 : Work on the hydraulic system. Op. DS 00 30
TOOLS
i) On the clutch cylinder :
1 plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D 391-63.
j) On the low pressure pump :
2 plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D 391-63.
IMPORTANT NOTE : All plugs, caps and pegs must be properly cleaned before using.
5 PRECAUTIONS PRIOR TO ASSEMBLY
The steel pipes must be blown through with compressed air. Rubber pipes and ring seals must be washed in
alcohol and then blown off with compressed air. Cleaning of the hydraulic units must be carried out with
alcohol, to the exclusion of all other products. After cleaning, blow off the parts with compressed air.
6 FITTING THE SEALS
a) Seal plates :
Before refitting a seal plate, make sure that the ring seals are in position and in good condition (not
deformed or split). It is necessary to examine the ring seals very carefully, if need be with a
magnifying glass, it is preferable to replace the ring seals.
When fitting position, make sure that the fluid holes in the plate correspond to those in the flanges.
b) Sealing sleeves (see P1. 94, fig. 2):
NOTE - Sealing sleeves must be replaced after each dismantling operation.
1. Place the sealing sleeve (3) on the pipe. This sleeve must be set back 2 mm from the end of the pipe.
2. Centralise the pipe in the bore by aligning it with the axis of the bore.
VERY IMPORTANT - Make sure that the end of the pipe enters the small bore (at "a").
3. Screw the union nut by hand. On certain units the axis of the bore is oblique relatively to the face of the
boss for the nut.
4. Lightly tighten the nut, 4.3 to 5.7 ft/lbs. (0.6 to 0.8 m. kg).
This light tightening of the nut is sufficient to ensure a good seal. Excessive tightening will cause leakage.
c) Ring seals :
NOTE - Because of their design, the efficiency of these seals increases with pressure. One does not
increase the sealing by increasing the tightening of the unions.
Replacement of the ring seals :
1. Moisten the ring seal with hydraulic fluid.
2. Fit a tapered sleeve (tapered sleeve MR-3384-l1 for the union of the high pressure pump, see Pl.94, fig.3
and tapered sleeve MR-3384-l0 for the spindle of the low pressure pump, see Pl. 94, fig. 1), etc Tapered sleeve MR-3384-11
Tapered sleeve MR-3384-10
3. Fit the ring seal in position by sliding it over the tapered sleeve.
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