1006
Model Code Page
66. Air suspension of front axle
1. 8. 2000
660 46200--8950
1. 11. 1998
2. Overflow valve
(only on tractors equipped with pressure air brakes)
A. Function
This valve ensures that the pressure air flow into the sus-
pension occurs just when the correct pressure affects the
air brake system (although the suspension air bellows are
leaking). Non---return valve (h) prevents return of the air
form port 2 (suspension) to port 1 (reservoir). If the pressure
drops in port 1, the pressure in the second side 2 remains
the same.
Compressed air flows in the direction of the arrow through
valve and through port (g) to the underside of membrane
(d). Spring (b) presses the membrane against the seat.
When enough high pressure has reached (6,2---6,5 bar),
springforce(b)isovercomesothatthemembrane(d)rises
up from its seat and passage (e) opens . Air flows thr ough
the no n---return valve (h) into the suspension. Return flow is
impossible since the non---return valve closes, if the pres-
sure in the suspension is higher.
B. Adjustment
The valve opening pressure can be adjusted by turning
screw (a). When turning clockwise the opening pressure
increases and vice versa.
The valve does not need any maintenance. Opening pres-
sure (1 ---> 2) factory setting is 6,2---6,5 bar (closing pres-
su r e --- 1 0 % ).
Note! In case of damage the whole valve is changed.
3. Other components
Compressor, deicer, pressure regulator, pressure reservoir
andpressuregaugearethesameasfortheairbrakesof
the trailer (option).
Concer ning these parts, see pages 510/6---7 and
511/4---7.
Note! The pressure air pipes of the suspension system
have been made of nylon pipes and quick couplings.
IMPORTANT! Although the engine is stopped, the suspen-
sion system remains under pressure. Always before main-
tenance works, make the system unpressurised e.g. by
turning the level valve linkage.
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