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Bomag bw 120 ad-3 not moving
- Thread starter yazan
- Start date
mg2361
Senior Member
Does it sound like it wants to drive against the brake? Does it steer? Travel cable connected to the pump? Oil level good? Have you checked charge pressure, both in neutral and with the lever in forward and reverse?
yes it does try to move but slowly, if travel moved any direction the machine will decrease rpm then engine stop , even i put more rpm from the shifter it will will not move
oil level good , pressure not cheked yet
it's weird, i think its electrical problem , not mechanical , some notes i see today like : 1- seat switch , after bypassing by jump the brown to green wires , the indicator in the circuit board is on, but not the light in dash panel
2- moving the travel shifter from 0 position * park brake position* also will indicate the bulb in the circuit board is on, but not the light in dash panel
3- i put a small led bulb at the brake valve solenoid terminals to test when there is power delivered , some times it will have power and some times will not ,
but after that , if jumping direct power from battery to brake valve solenoid should it move ?
2- moving the travel shifter from 0 position * park brake position* also will indicate the bulb in the circuit board is on, but not the light in dash panel
3- i put a small led bulb at the brake valve solenoid terminals to test when there is power delivered , some times it will have power and some times will not ,
but after that , if jumping direct power from battery to brake valve solenoid should it move ?
mg2361
Senior Member
If the brake solenoid is activated, it should move. So, either the brake solenoid valve is not allowing the pressure to the brake to release it, or you have a drive issue. Check brake release pressure first. If that is OK, then check the charge pressure as I mentioned above.
Sorry to forget . steering is fine also vibrator is fine also. It can steer and vibrate at idle.
After cleaning terminals the brake peeping alarm is always on.
I ordered Pressure testing kit ..still on the way.
mike holcomb
Well-Known Member
I have a Bw120 AD4 and had same issue. Turned out to be a bad shut off switch on dash. Water got into it and it wouldn't move like brakes were stuck on. Just happened to find it by taking dash apart while running and messing with wires to switch and fwd/rev handle and it moved. Put new switch in and its been good for last yr. Also check your fuses just to be sure all contacts are clean.
