CITROEN CX 1988 Service Manual

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8531-8532

SPECIFICATION AND PARTICULAR FEATURES OF
THE SOURCE AND RESERVE OF PRESSURE
5531-8532

SPECIFICATION AND PARTICULAR FEATURES OF
THE SOURCE AND RESERVE OF PRESSURE
Reservoir:
The reservoir is located in the left hand rear section of the engine compartment. Its breather, situated on the filler
cap, is connected to a filter-capsule placed in the LH wheelarch.
Level indicator: Fig. I
A: maximum mark
B: minimum mark.
Key to reservoir diagram: Fig. I and II
1 - Overflow return from front and rear suspension cylinders.
2 - Overflow return from security valve and front rear height correctors
3 - Reservoir breather with filter in wheelarch.
4 - Hydraulic control block return pipe (ABS).
5 - Operational and overflow return pipes from compensator-brake control valve.
6 - Operational return pipe from pressure regulator and front and rear height correctors.
7 - Suction line for HP pump.
8 - Baffle deflector.
9 - Filter for overflow and operational return pipes.
10 - Fluid level indicator float.
11 - Filter on HP pump suction line.

A
B
;x. 39-2
BX. 39-2
8531 -a532

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i. 39-9

CHARACTERISTICS AND SPECIAL FEATURES OF
THE SOURCE AND RESERVE OF PRESSURE
High pressure pump: Fig. I
- Five-piston volumetric-type pump.
- The pump rotates at half engine speed
- Pump delivery per turn (for information) : 4 cm3
- Maximum pressure: Theoretically, there is no limit to the maximum pressure. In practice, the maximum pressure
is controlled by the pressure regulator. Priming the five-piston HP pump can only be carried out when the pressure-
release screw of the regulator is open.
Pressure regulator with pilot slide-valve: Fig. II
- Cut-out pressure:
- Cut-in pressure:
- Thickness of shims (I ) for cut-out adjustment:
- Thickness of shims (2) for cut-in adjustment:
- One 0.3 mm shim brings about a change in pressure by:
- One 0.7 mm shim brings about a change in pressure by: 170 + 5 bars
145 +: 5 bars
0.3 mm
0.3 and 0.7 mm
approx. 3 bars
approx. 7 bars
Main accumulator: Fig. II
- Capacity: 0.4 litres
- Calibration pressure: 62 rt 322 bars *
8531-8532

SPECIFICATION AND PARTICULAR FEATURES OF
THE SOURCE AND RESERVE OF PRESSURE
Security valve: Fig. I
Calibration pressures for slide valve return spring:
- Pressure for isolation (no supply to suspension at A and D) :
- Pressure for supply to suspension (delivery at A and D) : 110 bars min.
130 bars min.
Key to diagram:
A : Feed to front height corrector.
B : Feed to steering rack and control unit.
C : H.P. inlet
D : Feed to rear height corrector.
E : Leakage return.
(1) : Adjusting shims for the calibration of slide valve return spring.
Shim thickness
(2) : Slide valve.
(3) : Fault detector (mechanically operated through shifting of slide-valve (2) 1.
Brake accumulator: Fig. II
-Capacity: . . . . . . . .._.._..~..._~._............_..........._.....
- Calibration pressure: 0.9 mm
0.4 litres
2
62 f 32 bars
F : HP inlet.
G : Centrifugal regulator, security valve
H: Brake control valve.