SPIERINGS SK375-AT3, Manual, Page: 166 / 228

SK375-AT3
Pneumatic system
Truck
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9.2. Secundary system
The secondary system is composed of two compressed air reservoirs (see Picture 9-1 ):

Compressed air reservoir 4 (10 liters):
- This reservoir ensures the air pressure for all secondary components (accessories);

Compressed air reservoir 5 (20 liters):
- This is an emergency reservoir for the clutch and the gearbox. If the air pressure in the
secondary system is lost, still the clutch and the gearbox can be switched for a few times.
The following components are operated by the secondary system:

Engine brake:
- Close/open exhaust valve;
- Enable/disable fuel pump;

Gearbox:
- Power supply various features gearbox and retarder;

Transfer case:
- Switch between on-the-road mode / off-the-road mode;
- Switch longitudinal differential lock axle 2;
- Switch towing position;

Axles:
- Switch transversal differential lock axles 2 and 3;

EAS-system:
- Supply control AdBlue;

Cab:
-
Air suspension driver’s seat.
The pressure reducing valve for the components of the secondary circuit is adjusted to 5.5 bar.