140G motor grader braking system

[Mon]

Hi please advise on the braking system for the 140 G serial no. 50h496. We have serviced everything, changed compressor, clutches and foot valve. Any help on this.

 

[Nige]

It might help a little if you gave a description of the problem/symptoms, how they started, etc

 

[Mon]

Thank you for the response, the machine started loosing brakes, was oil from the tank which was drained and cleaned. We changed compressor and foot valve, serviced the whole system but still the brakes are not responding. We tested pressure to the tank which was there.

 

[Dave Neubert]

See if you have air to the hose where it goes into the tandems

 

[Mon]

Yes there is air in both sides.

 

[Nige]

Remove one of the air hoses on top of the tandem (incoming from the treadle valve to the brakes). Attach a pressure gauge to that hose and press the treadle valve. Repeat the check with the other side of the machine.
What pressure do you see.?

The S/No you quoted is not correct for a 140G. The options are 13W, 72V, 81V, or 5MD.

 

[Dave Neubert]

See what your pressure is like Nige says if you have 90-120 psi then the problem will be in the brakes maybe you cut the seals when going together

 

[Nige]

We changed compressor and foot valve, serviced the whole system

I get the impression the OP is talking about the air system, not the wheel ends.

 

[pedrocar]

Have you taken the covers off of the chain boxes apply brake look for bubbles in the oil