SK599-AT5
Pneumatic system
Truck
SPIERINGS MOBILE CRANES USER MANUAL V 0.1
9-1
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9.
Pneumatic system
The pneumatic system consists of a primary and a secondary system (see the pneumatic diagram in
the Annex). The
primary system
is composed of two circuits, which are intended for the brakes of the
truck. The
secondary system
is intended for the parking brake, gear box and accessories and is also
composed of two circuits.
The air pressure is supplied by a compressor, which is mounted on the engine. The pneumatic system
is secured by a safety valve. If there is a leak in one of the four circuits causing the elimination of the
air pressure, this safety valve ensures that the other three circuits remain their air pressure.
9.1.
Primary system: the brakes
The brake system consists of three compressed air reservoirs (see
•
Compressed air reservoir 1
(60 litres):
-
This reservoir ensures the operating of the (service) brake boosters of axles 1 and 2;
-
This reservoir also provides the compressed air for operating the relays for the benefit of
the (service) brake boosters of axles 1 and 2 by means of the foot brake pedal;
•
Compressed air reservoir 2
(60 litres):
-
This reservoir ensures the operating of the (service) brake boosters of axles 3, 4 and 5;
-
This reservoir also provides the compressed air for operating the relays for the benefit of
the (service) brake boosters of axles 3, 4 and 5 by means of the foot brake pedal;
•
Compressed air reservoir 3
(40 litres):
-
This reservoir ensures the operating of the (service) brake boosters of axles 2, 3 and 4;
-
This reservoir also provides the compressed air for operating the relays for the benefit of
the (service) brake boosters of axles 2, 3 and 4 by means of the parking brake lever.
The parking brake is venting based. As soon as the brake lever is operated, the parking brake
boosters on axles 2, 3 and 4 will be vented, causing the brakes to start performing.
4
1
2
3
5
Picture 9-1
