Functional Description Auxiliary Loads N

TM 5-2420-224-20-1

AIR SYSTEM (CONT)

Functional Description Auxiliary Loads N

This takes place by means of the pressure relief

valve (29.1). The pressure is approx. 5 PSI/0.35

bar.

The auxiliary loads include:

Four-wheel drive and differential locks (G)

Intermediate Speed Shift

Axle vent (H)

The intermediate speeds are pneumatically shifted

with the aid of the shift lever valve (45.4).

Intermediate speed shift (J)

The

control

valve

(45.5)

provides

the

The compressed air supply of the brake system

corresponding control pulses for air entry and

has priority, i.e., a minimum pressure of approx.

escape in the shift cylinder (20.8) in the cascade

80 PSI/5.5 bar is first made available to the brake

box.

system.

The solenoid valve (33.1a) releases the supply air

From a pressure of 80 PSI/5.5 bar, the auxiliary

to the control valve (45.5) only when the clutch is

loads receive their supply via the overflow valve

operated in order to shift speeds.

(7.3) up to an operating pressure of 107 PSI/7.35

bar.

The valve (33.1a) is electronically actuated after

the clutch pedal has been fully depressed down to

the contact switch.

Four-Wheel Drive Differential Locks

The four-wheel drive is engaged in the

transmission in position (1) of the changeover

valve (32.1). In position (2) the differential locks of

the axles are additionally activated.

Axle Vent

In both positions (1 and 2), the axles receive a

compressed air supply at slight pressure for

fording purposes.

1-16.8

Change 1