Bomag BW 156 D-3, Service Manual

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Service Training
BW 156/177 D-3/PD-3
BW 178/179 D-3/PD-3
- DTr 18 -
Fig. F17:
Checking the multi-function valves
The opening cross-sections of the high pressure relief valves, which are part of the multi-function valves,
are very small. Hydraulic oil escaping from the high pressure side through the high pressure relief valves
(e.g. in case ofa defective pressure override, which is also part of the multi-function valve) will cause
very quick overheating of the hydraulic oil.
• Pull the plug off the brake solenoid valve
• Block drum and wheels with chocks
• Start the engine and run it with max. speed
• Actuate the travel lever to both directions and check the multi function valves for heat development.
• If one of the valves develops excessive heat, it must be immediately replaced
Attention ! Tightening torque for multi-function valves 89 Nm