C190 Brake Problems

[cmartin9]

Hi Everyone, I have a 2000 C190 that I am having trouble with the brakes locking up. It will run for about 5 minutes and then it will jerk a couple of times and then not move. When it does this, the park brake light doesn't come on. This machine has a newly rebuilt hydrostatic transmission, I have replaced one of the brake valves and solenoid, and the charge pressure switch that is in-between the two brake valves. The seat sensor and the the seatbelt sensor seem to be working fine. Also, the two speed switch doesn't work. I'm not sure if it is the switch, or something else. Any ideas what could be causing this?

 

[Mike10]

First, there is only one brake valve, the other valve is the two speed valve. I would take a second look at the seat switch, it may be sensitive. When going over rough ground you may bounce enough to momentarily cause the seat switch to open. The second possibility is the seat harness itself. The way the Harness is setup on those older machines is the power to the seat belt must come through the seat switch so if the seat switch opens the brakes are applied. NH changed the harness so the power goes to both the seat switch and seat belt switch at the same time. The old harnesses can be modified to do the Same thing. I can not remember exactly which wire to move. I am thinking the green wire with the red stripe is the power source. I think the other green wire was in the same terminal of the tan wire at the seat switch connector. I think the two green wires get connected together. I would just replace the harness with the newer harness for one seat switch. There is a time delay on the seat switch circuit so it is the lack of power at the seat belt which causes the brakes to apply in the older machines.

 

[cmartin9]

First, there is only one brake valve, the other valve is the two speed valve. I would take a second look at the seat switch, it may be sensitive. When going over rough ground you may bounce enough to momentarily cause the seat switch to open. The second possibility is the seat harness itself. The way the Harness is setup on those older machines is the power to the seat belt must come through the seat switch so if the seat switch opens the brakes are applied. NH changed the harness so the power goes to both the seat switch and seat belt switch at the same time. The old harnesses can be modified to do the Same thing. I can not remember exactly which wire to move. I am thinking the green wire with the red stripe is the power source. I think the other green wire was in the same terminal of the tan wire at the seat switch connector. I think the two green wires get connected together. I would just replace the harness with the newer harness for one seat switch. There is a time delay on the seat switch circuit so it is the lack of power at the seat belt which causes the brakes to apply in the older machines.

Thanks Mike, I will try that!

 

[cmartin9]

First, there is only one brake valve, the other valve is the two speed valve. I would take a second look at the seat switch, it may be sensitive. When going over rough ground you may bounce enough to momentarily cause the seat switch to open. The second possibility is the seat harness itself. The way the Harness is setup on those older machines is the power to the seat belt must come through the seat switch so if the seat switch opens the brakes are applied. NH changed the harness so the power goes to both the seat switch and seat belt switch at the same time. The old harnesses can be modified to do the Same thing. I can not remember exactly which wire to move. I am thinking the green wire with the red stripe is the power source. I think the other green wire was in the same terminal of the tan wire at the seat switch connector. I think the two green wires get connected together. I would just replace the harness with the newer harness for one seat switch. There is a time delay on the seat switch circuit so it is the lack of power at the seat belt which causes the brakes to apply in the older machines.

I put a jumper wire in the seat harness to take the seat switch out of the circuit and the brakes are still applying. When it stops, there is power at the seatbelt still. On this machine, the brake valve is on the outside and the two speed valve is on the inside, is that correct?

 

[cmartin9]

First, there is only one brake valve, the other valve is the two speed valve. I would take a second look at the seat switch, it may be sensitive. When going over rough ground you may bounce enough to momentarily cause the seat switch to open. The second possibility is the seat harness itself. The way the Harness is setup on those older machines is the power to the seat belt must come through the seat switch so if the seat switch opens the brakes are applied. NH changed the harness so the power goes to both the seat switch and seat belt switch at the same time. The old harnesses can be modified to do the Same thing. I can not remember exactly which wire to move. I am thinking the green wire with the red stripe is the power source. I think the other green wire was in the same terminal of the tan wire at the seat switch connector. I think the two green wires get connected together. I would just replace the harness with the newer harness for one seat switch. There is a time delay on the seat switch circuit so it is the lack of power at the seat belt which causes the brakes to apply in the older machines.

Ok, I have replaced the harness to the seat switch and seat belt. It will run for about 15 minutes and then the brakes lock up still. When it stops, you have to let it sit for about 5 minutes or so before it will move again. It's almost like something is getting hot and it has to cool down before it will move again. Any other ideas on what could be causing this?

 

[Mike10]

Ok, I have replaced the harness to the seat switch and seat belt. It will run for about 15 minutes and then the brakes lock up still. When it stops, you have to let it sit for about 5 minutes or so before it will move again. It's almost like something is getting hot and it has to cool down before it will move again. Any other ideas on what could be causing this?

The next thing is to replace the coil on the brake valve or the complete valve.

 

[cmartin9]

The next thing is to replace the coil on the brake valve or the complete valve.

I replaced the valve and coil before I replaced the seat harness, so it is brand new.

 

[Clew]

I replaced the valve and coil before I replaced the seat harness, so it is brand new.

Did you find the problem of the skid steer stopping I have a C185 doing the exact same thing, can’t figure it out Your help would be appreciated Carl