6
Adjustment of Levelling ValveBasic Training
15
After mounting the air levelling valve, the lever length is
adjusted following the vehicle manufacturer’s
instructions. For adjusting the valve at the vehicle it is
decisive which total spring travel the axle permits.
When the air suspension bellows are pressureless, the
vehicle’s superstructure rests on the rubber buffers of the
chassis. As the bellows are pressurized, the
superstructure is raised.
When the air suspension bellows’ “unladen” level (level
for loading or for mounting passengers) has been
reached, the lever on the valve is moved to its neutral
position. To facilitate the installation and adjusting of
lever and connecting linkage the levelling valve shaft can
be fixed by plugging a parallel pin of Ø 3 mm in the idle
position.
If the vehicle is at a normal level, the connecting linkage
can be installed. The linkage has to be aligned vertically.
The space A between the fulcrum on the levelling valve
lever and the fulcrum on the angle bracket should not be
less than 150 mm. The linking 433 401 003 0 has to be
ordered seperately.
The relation lever length L / rod length A should be
≤ 1.2
if the closing angle of max. 45° is not exceeded. The lever
length “L” should be 175 to 295 mm (following the
instructions of the vehicle or Achsherstellers) betragen. If
a shorter lever has to be used, a higher air consumption
of the levelling valve has to be concerned.
Depending on the fitting positon various cranks of the
lever are possible. By accordingly fixing or turning the
lever for 180° the valve can be optionally operated from
right or left. Depending on the final installation positon -
vertical or horizontal - the lever is to be placed through
one of the two bores in the operating shaft which are
diplaced to each other for 90°.
Variant ... 100 0 is adjusted to a closing angle of 30° ± 2°
by plant. The pilot pressure is 15 - 45° bar. A closing
angle of 15° is not permissible, otherwise the cross-
section will reduce itself and this can lead to complete
closing.
For adjustment of the closing angle the rubber plug
underneath the 3/2-Directional Control Valve has to be
removed to adjust the adjusting screw with a Torx T30
screwdriver:
- Counterclockwise means a reduction of the closing
angle, clockwise means an increasing.
- A rotation = approx. 10° changing of the angle
After the vehicle has been lowered to its buffers with the
help of a rotary valve the height of the chassis has to be
measured. Then the chassis has to be raised by the
rotary valve. Should the permissible full suspension be
achieved before the Height Limitation of the levelling
valve sets in, the raising has to be cancelled and the
vehicle has to be lowered. Turning the adjusting screw
counterclockwise the closing angle and also the
suspension way are reduced.
If the height limitation sets in before the chassis is at the
required hub height, the vehicle has to be lowered also in
this case. Turning the adjusting screw counterclockwise
the closing angle and also the suspension way are
reduced. This process has to be repeated until the
required suspension way (equal or less than the
maximum suspension way given by the axle producer) is
achieved. The final braking position has been reached.
Important
The transfer linkage and the lever of the levelling valve
need not to be in one line, because the linking is turning
around and this could cause damages on the levelling
valve.
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