Service Training Steering The single drum rollers of series BW 145-3 are equipped with hydrostatically operated articulated steering. The steering system mainly consists of steering pump, steering valve, steering cylinder and the pressure resistant connecting hoses.
to the charge system 210 bar
7
1
6 5
210 bar
3 2 4 from the steering pump
Fig. 1 Steering hydraulics 1
Rating pump
2
Distributor valve
3
Steering pressure relief valve (∆p =140 bar)
4
Check valve (pre-loaded to 0.5 bar)
5
Anti-cavitation valve
6
Shock valves (200 bar)
7
Steering cylinder
The steering pump draws the hydraulic oil from the hydraulic oil tank and delivers it to the steering valve and the connected steering unit under the dashboard of the machine. If the steering is not operated, the complete oil flow flows through the fine filter to the charge ports for the closed circuits for travel drive.
When turning the steering wheel the distributor valve inside the steering unit will guide the oil flow to the corresponding side of the steering cylinder. A rating pump inside the steering unit measures the exact oil quantity corresponding with the turning angle of the steering wheel and delivers the oil to the steering cylinder. The steering cylinder extends or retracts and articulates the machine.
BW 145 D-3 / DH-3 / PDH-3
-G1-
