DS 19 OPERATION No. DS 314-3 : Work on the clutch control units. Op. DS 314-3 183
TOOLS
OVERHAULING A CLUTCH SYSTEM
See Op. DS 314-1, paragraphs 15 and onwards.
CHECKING FOR LEAKAGE (see Pl. 49).
In order to carry out this operation, the test bench should be prepared as indicated on Pl. 171. Connect the clutch
cylinder to the pump orifice “a”, using the pipe (H). Tighten the bleed screw “b” and operate the pump to obtain
a pressure of 1070 p.s.i. (75 kg/cm
2
). The pressure gauge (MI) should not indicate a drop in pressure, if so, the
joint or assembly is defective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test bench 2290-T
2 Release the pressure by unscrewing the pump bleed screw “b”.
Remove the pipe (H).
OVERHAULING A CLUTCH ENGAGEMENT CONTROL
Dismantling (see Pl. 48, fig. 4).
3 Remove the connecting screws (6) from the body (7) and from the bearing block (8).
Disengage the bearing block from the body. Do not lose the ball (9).
4 Remove the upper plug (10). Remove the lower plug (11). Disengage the spring (12), the piston (13) and the ball
(14). Remove the seal (15), (16) and (17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14-17 mm box
spanners
5 Clean the parts in alcohol to the exclusion of all other products, do not use trichlorethylene and blow with
compressed air.
Assembly (see Pl. 48, fig. 4).
6 Make sure that the lever (18) is tight on the spindle, if not, replace the clutch engagement control. Make sure that
the lever (19) is tight on the spindle, if not, weld at one point.
7 To remake the seating of the ball (14). Insert a ball that is in good condition in the bore of the body and make an
impression by striking the ball with a drift and a mallet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drift = 6 dia.
Length = 100
NOTE - Never carry out this procedure on the ball (9), the flow through the clutch engagement control being con-
trolled by the notches on the seating, spreading the metal by hammering destroys the notches and will modify
the flow; in this case, replace the clutch engagement control.
8 Put in the body of the clutch engagement control : a new ball (14), the piston (13) (see illustration for position).
A light cleaning up of the piston with No. 600 abrasive paper moistened with alcohol is permitted, if there are
any signs of slight seizure. Make sure that there is no obstruction in the hole. Fit the spring (12), the plug (11),
together with a ring seal (17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 mm box spanner
9 Put in the body, the ring seal (15), then the ball (9). Fit the bearing block (8) in the body (see illustration for
position).
During this operation, see that the ball (9) rests in position on its seating.
Fit the screws (6) (spring washer), hold the lever (18) on the ball (9). Fit the plug (10) together with its seal (16)
This is a square sectioned seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14 mm box spanners
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