SK375-AT3
Steering system
Truck
12-2
SPIERINGS MOBILE CRANES USER MANUAL V 0.0
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12.1.1.
On-the-road mode
In the
on-the-road mode
the front axle 1 is mechanically steered, while axle 3 is steering in the
opposite direction (up to 50 kph (31 mph)). This causes a smaller turning circle.
12.1.2.
Off-the-road mode
In the
off-the-road mode
, the vehicle speed is limited to 15 kph (9.4 mph).
12.2.
Steering mechanisms
In this section the used steering mechanism per axle is described.
A distinction is made in the following mechanisms:
Mechanical:
The rotating movement of the steering wheel is activated in the steering box and transposed
into the mechanical movement of the steering rods. These rods operate the steering arm of
axle 1;
Hydraulic:
Axle 3 is hydraulically steered by means of a valve block and a main steering cylinder;
Retracted axle:
If the axle is fully retracted, a buzzer will shortly sound.
Non-steering axle:
Concerns a non-steering axle.
12.3.
Performance steering system
the mechanically steered steering axle 1 and the hydraulically steered rear axle 3, steering angle
sensors are mounted, which measure the current steering angle.
The measuring signals are processed by the Electronic Control Unit (ECU) of the steering system.
The ECU then controls the position of the hydraulically steered axles by means of the chosen steering
mode or the chosen steering program, by steering the hydraulic valve block.
the operation of the steering system is schematically shown.
ECU
Steering angle
sensor axle 1
Steering angle
sensor axle 3
Steering cylinder
axle 3
as
3
Valve block
Picture 12-2
