Function

Function

Standard steering 2 In standard steering mode 2, the rigid axle (2) is steered entirely hydraulically, using the Orbitrol steering unit (steering wheel). The floating axle (1) is steered electro-hydraulically, but cannot be influenced. Steering of the floating axle (1) here is automatic as a function of the current steering angle of the rigid axle (2) and of the current steering program. At high vehicle speeds >20 km/h (road travel). the floating axle (1) is tracked in the straight ahead position. Standard steering 2 is active automatically under the following conditions: –The rigid axle (2) is the front axle in direction of travel.

–The road travel or fieldwork steering mode has been selected. –No special steering program is active. The steering hydraulics pump (218) supplies the Orbitrol steering valve (IV) and the proportional automatic floating axle steering valves (Y190-2a, Y1902b) with volume flow.The steering logics shut-off valves (Y188-3 and Y188-4) as well as the steering logics definition valves (Y189-5, Y189-6 and Y189-9) are energised. Example (see circuit diagram): The cab position actuates the steering sense valve (V).When turning the steering wheel, volume flow from port L of the Orbitrol steering valve (IV) flows through the actuated steering sense valve (V) and the definition valve (Y189-10) into the floating axle steering cylinder (323-2). During this process, volume flow is displaced from the other cylinder side and flows back into the Orbitrol steering valve (IV) via the energised definition valve (Y189-6). Now the rigid axle (2) is steered entirely hydraulically by the Orbitrol steering unit (steering wheel). The floating axle steering cylinder (323-1) receives volume flow via the energised proportional automatic rigid axle steering valves (Y190-2a or Y190-2b) and the energised steering logics shut-off valve solenoid valves (Y188-3, Y188-4). Control is by the electro-hydraulic steering module (A55).