5-060 - Repair, adjustment - Checking and adjusting staircase circuit Air suspension - Trucks

Checking and adjusting staircase circuit

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Commercially available tool

Testing and adjusting

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1 Lower vehicle as far as the stop using the pushbutton unit (bellows pressure 0 bar).

2 Detach plug from switch of 2nd rear axle (1) and connect multimeter to the switch.

3 Raise vehicle at the 2nd rear axle with jack until the tires are 50 to 60 mm from the ground (dimension (A)) and the vehicle is no longer supported by the suspension.

4 Mark position of shock absorber tube (2).

5 Lower the vehicle.

6 Raise vehicle 10 mm (dimension B) using the pushbutton unit.

Note

Read off dimension B at the marking on the shock absorber tube.

7 Adjust knurled screw (3) until the multimeter displays continuity. Tighten the lock nut in this position.

8 Lower the vehicle as far as the end stop using the pushbutton unit (bellows pressure 0 bar).

9 Detach the plug from the switch of the 1st rear axle (4) and connect multimeter to the switch.

10 Adjust knurled screw (5) until multimeter displays continuity. Tighten the lock nut in this position.

11 Adjust switch on the left and right of 1st rear axle in a similar way.

12 Connect plug to switch of 1st and 2nd rear axle.