863 traction lock/brake solenoid melted

[tomagregg]

I have a 1997 bobcat 863
My traction lock/brakes solenoid has melted
I am getting 12 volts on the white wire even with the key off
I get 9 V on the red wire when I turn the key on
Can anyone tell me what kind of voltage I should be getting on the white and red wire and for how long?
I read somewhere that the white wire should get 8 V temporarily, like five seconds, to energize the coil to pull up the lock shaft and then the red wire with 12 V should keep it locked up on the second coil until the key is turned off where the traction lock switch is pushed again
The 25 amp brake fuse was blown

 

[brdgbldr]

I have a 1997 bobcat 863
My traction lock/brakes solenoid has melted
I am getting 12 volts on the white wire even with the key off
I get 9 V on the red wire when I turn the key on
Can anyone tell me what kind of voltage I should be getting on the white and red wire and for how long?
I read somewhere that the white wire should get 8 V temporarily, like five seconds, to energize the coil to pull up the lock shaft and then the red wire with 12 V should keep it locked up on the second coil until the key is turned off where the traction lock switch is pushed again
The 25 amp brake fuse was blown

I'm not sure on that machine but normally a coil will take a high voltage to pull the shaft and then a lower voltage to hold it in place.

 

[Tlawdogg]

I copied this from another discussion on it:

There are 3 different circuits. You have the ground circuit,the pull circuit and the hold circuit. The ground circuit is obviously goes back in around about way to the battery and to the BICS controller behind your right elbow when in the seat. The pull circuit provides 12 volts for about 5 seconds when you hit the green button on the dash and it controller by a brake fuse and a brake relay. Once the brake solenoid pulls the brake plunge (thus causing the clunking sound) the hold circuit takes over and keeps 12 volts the the brake solenoid form the BICS controller. Depending on how many times the green traction light flashes will tell you generally what to look for. One flash means the traction lock hold coil circuit is open. Two flashes mean the traction lock hold coil circuit is shorted to battery voltage. Three lights flashing means the traction lock hold coil circuit is shorted to ground. Four flashed mean the traction lock pull coil circuit is open. Five flashes mean the traction lock pull coil circuit is short to battery voltage. six flashed is the traction lock pull coil circuit is shorted to ground. It has been my experience that possibly the brake coil is bad. You can check the ohms to see if it is bad.the wires on the brake solenoid have the words pull and hold on them. The pull wire which I believe is the red wire to the ground wire should measure around .3-.6 ohms. Measure the hold circuit the white wire to ground and it should measure around 10-11 ohms. Also the BICS controller could be shorting out internally or the connection is loose.

 

[Jim A]

To high ohms cause heat and windings in coil to get hot which cause resistance exponentially to increase .
low Voltage also cause components to overheat .
Ohms law applies always.

 

[tomagregg]

Thank you for your assistance. I got into my relays and found the relay that is responsible for the traction lock solenoid was full of water and just fell apart when I tried to pull the cover off. I put a new relay in and everything works should.
I had to put in a new traction lock solenoid because the old one was toast