DS 19 OPERATION No. DS 334-3 : Work on the gear control. Op. DS 334-3 240
TOOLS
32 Remove the ring seals (27) from the synchronising pistons. Use a brass wire hook. Be careful not to scratch the
bore or damage the groove, the edge of which must be a sharp angle.
33 Remove the unit from the stand :
a) If the 3rd speed automatic control piston is sealed by a seal ring, do not turn the unit over, in order to avoid
dropping the other pistons.
Proceed as follows
To remove the rear cover (13). Remove the screws and studs, then remove the cover, the springs (14) and
(15) and the spring caps (16) and (17) and the joint (21).
Remove the automatic gear control pistons through the front face of the selector, by pushing with the valve,
then with a brass drift.
Put the pistons (3) in a rack MR-3053-210 (see Pl. 71, fig. 3), in their order of disassembly.
Remove the automatic gear control valve (18). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rack MR-3053-210
Drift = 5 mm dia.
Length = 60 mm.
b) If the 3rd speed automatic control piston is sealed by an aluminium plug, proceed to dismantle in the following
manner
Remove the rear cover as indicated above (line a).
To drive out the aluminium plug (22) : tap lightly on the gear change automatic control valve (18) (brass drift),
until the plug (22) is removed.
Take care not to drive out all the pistons.
Disengage the pistons and place in the rack.
Remove the valve (18).
Remove the clutch automatic control valve (19) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drift = 5 mm dia.
Length = 60 mm
34 Remove the ring seals (20) from the gear control valve (10).
35 Remove the bleed screw (23) and its joint (24) (1st model).
36 Very carefully clean all the parts with alcohol and blow with compressed air.
Assembly (see Pl. 70).
NOTE - All the parts should be dipped in hydraulic fluid before assembly.
37 Fix the unit on a stand by the front cover (stand MR-3053-200, see Pl. 71, fig. 4) . . . . . . . . . . . . . . . . . . . . . . . . Stand MR-3053-200
38 Fit the auxiliary clutch control valve (12), through the front face of the unit. Fit the rubber distance piece (25)
with the slot facing the overflow return hole, then the cup (26).
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