118 SECTION 35 - HYDRAULIC SYSTEM
HYDRAULIC CONTROL LEVER VALVE OVERHAUL
Disassembly
1. Mark the direction of installation of all disassem-
bled parts.
2. Remove the U/J cam (1) using a key.
3. Remove the plate (2).
4. Remove the shim (3) from the upper body (4).
5. Extract the rod guide (5) and replace the seal
rings (6) and (7).
6. Drift the rod (8) out.
7. Remove the spring guide (9), the spring (10)
and the shims (11).
8. Extract the spool assembly.
9. Hold the cover (12) and remove the safety ring
(13).
10. Remove the spring (14) and the spool (15).
11. Remove and note the thickness of the shims
(16).
12. Proceed in the same manner for the other rods.
13. Secure the upper body (4) in a vice.
14. Loosen and remove the screw (17) using a key
and replace the O-ring (18).
15. Separate the upper (4) and lower (19) bodies
and replace the seal rings (20) and (21).
Reassembly
1. To reassemble, proceed in the reverse order to
that of removal.
2. In the case of reassembly without changing the
U/J cam (1), put the same value of shims (3) as
those in place.
3. After changing the U/J cam (1) adjust the pres-
sure of the cam on the rods.
4. Install a 2 mm shim (3), check that the recessing
of the push-rods is less than 0.2 mm, modify the
shimming to more or less if required.
5. Assemble the new seal rings (6), (7) and O-rings
(18), (20) and (21).
6. Lubricate the moving parts.
7. Apply brake thread fluid on the threads of the U/
J cam (1) and the screw (17).
8. Tighten the cam (1) to 50 Nm and the screw (17)
to 50 Nm.
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