Instruksjonsbok Volvo A25D - A30D

Steering System

Easy and comfortable steering Hydro-mechanical steering makes the machine easy to steer, even at low engine speeds and in tough operating conditions. Hydraulic damping ensures that impacts and jolts are not transmitted to the steering wheel and opera- tor. Variable displacement piston pumps provide flow on demand only, conserving power and reducing fuel con- sumption. Steering is fast and precise with a low effort for safe operation at all speeds. Superb directional stability due to mechanical feedback A feedback rod (1) from the load unit communicates with the steering valve and neutralizes shock loads caused by negative steering forces that would otherwise affect the steering angle. There is no need for the opera- tor to compensate with the steering wheel when operat- ing over ruts or bumps. This assures high-speed directional stability even on rough ground. The steering angle is proportional to the number of turns of the steer- ing wheel, regardless of the steering or engine speed, providing a smooth and steady automotive-type feel. Secondary steering Secondary steering is standard. A ground dependent pump (A) mounted on the dropbox works in parallel with the engine-driven pumps when the hauler is moving. This means that the hauler can be steered safely even if the engine should fail.

1

A

Malfunction indication If a malfunction occurs in the steering system, the Opera- tor Communication System provides warnings via warn- ing lights (1 & 2) , the Central warning light (3) , operator display and the buzzer all depending on the level of malfunction.

1 2

3

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