Bomag BW 156 D-3, Service Manual

Page: 93 / 190

Service Training
BW 156/177 D-3/PD-3
BW 178/179 D-3/PD-3
- DTr 5 -
Fig. F4:
Adjusting the mechanical neutral position
If the machine still moves after connecting both control chambers, the mechanical neutral position of the
travel pump needs to be adjusted:
• Connect 600 bar pressure gauges to the high pressure test ports
• Pull the plug off the brake solenoid valve and block the drum
• Start the engine and run it with max. speed
• Read the pressure gauges and adjust the mechanical neutral position on the adjustment screw of he
spring pack on the control cylinder (see illustration), until identical pressure (charge pressure) is
reached on both sides.
For higher accuracy repeat the testing and adjustment procedure with two 60 bar pressure gauges.