Bomag BW 156 D-3 Service Manual page 129

Steering
The single drum rollers of product ranges BW 156/177 D-3/DH-3/PDH-3 and BW 178/179 D-3/DH-3/
PDH-3 are equipped with a hydraulically operated articulated steering.
The steering system consists mainly of:
• the steering/charge pump,
• the steering valve,
• the steering cylinders and
• the pressure resistant connecting hoses.
The steering pump delivers the hydraulic oil from the tank to the steering valve and the connected
steering unit. 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 and vibration drive.
Fig. 1 Steering
1 Rating pump
2 Distributor valve
3 Anti-cavitation valve
4 High pressure relief valve
BW 156/177 D-3/PD-3
BW 178/179 D-3/PD-3
from steering/charge pump
5 Check valve
6 Shock valves
7 Anti-cavitation valves
8 Steering cylinder
Service Training
to the charge
ports
- F 1 -