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Case 85xt brake will not release

Stevechari

Stevechari

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Joined
Oct 3, 2016
Messages
12
Location
Dawsonville Ga.
Occupation
mason
i have a Case 85xt that the brakes will not release. I have been troubleshooting this problem on and off for awhile now. The bucket moves up and down but it will not move forwards or backwards. The neutral override solenoid and the brake pressure switch have both been replaced. But the brakes still will not disengage. All three safety switch lights are illuminated. Does anyone know if the brake solenoid in the back is bad if it could cause it to not disengage? Does anyone know how to check to see if the back up alarm switches are bad or not or if they could cause the machine to not disengage? I would appreciate anyone’s wisdom, ideas, or suggestions of what to try.
 
GaryHoff

GaryHoff

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Feb 25, 2009
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Location
Alberta, Canada
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Heavey Equipment Mechanic
I'm assuming you have checked all of your fuses? They get corroded, so it may be a good idea to just change them all anyways.

Do you have power at the brake pressure switch or neutral over ride coil?

Try jumping your interlock relay, pins 30 to 87, and see if the machine will move. Also re-check, and see if you have power at the neutral over ride coil (on top of the pumps)

You may also have a bad park brake switch or wiring in the joystick handle (power to the neutral over ride has to go through the joystick handle, so if you don't have power at the NOR coil, this is a good place to start looking)
Back up alarm switches will not cause a park brake issue.
Do you have the brake release valve? (silver valve with a red and black knob on it) Black knob should be pulled out.
 
Last edited:
Stevechari

Stevechari

Member
Joined
Oct 3, 2016
Messages
12
Location
Dawsonville Ga.
Occupation
mason
GaryHoff said:
I'm assuming you have checked all of your fuses? They get corroded, so it may be a good idea to just change them all anyways.

Do you have power at the brake pressure switch or neutral over ride coil?

Try jumping your interlock relay, pins 30 to 87, and see if the machine will move. Also re-check, and see if you have power at the neutral over ride coil (on top of the pumps)

You may also have a bad park brake switch or wiring in the joystick handle (power to the neutral over ride has to go through the joystick handle, so if you don't have power at the NOR coil, this is a good place to start looking)
Back up alarm switches will not cause a park brake issue.
Do you have the brake release valve? (silver valve with a red and black knob on it) Black knob should be pulled out.
Click to expand...
 
Stevechari

Stevechari

Member
Joined
Oct 3, 2016
Messages
12
Location
Dawsonville Ga.
Occupation
mason
I have power to the pressure switch, power going to the NOR but it’s not coming back out of the other lead. Is it not supposed to? I thought there should be 12 volts there also. I changed out all of the fuses and cleaned it all good. I also have power going to the brake button on the joy stick. Please let me know your thoughts on that. Thank you
 
GaryHoff

GaryHoff

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Feb 25, 2009
Messages
810
Location
Alberta, Canada
Occupation
Heavey Equipment Mechanic
85xt schematic.jpg

41 - NOR solenoid
46 - brake button
46a - 2 speed button
47 - 2 speed solenoid
 
GaryHoff

GaryHoff

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Feb 25, 2009
Messages
810
Location
Alberta, Canada
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Heavey Equipment Mechanic
At the NOR solenoid, remove the connector and test the wires. You should have 12V at the tan wire #307, and ground at black wire 178a6
 
K

Kcorey

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Jun 24, 2018
Messages
18
Location
Madison
Did you resolve your issue? I’m having similar issue with my 85xt, except it won’t drive and hyd lift doesn’t function
 
GaryHoff

GaryHoff

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Messages
810
Location
Alberta, Canada
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Heavey Equipment Mechanic
Kcorey, sounds like you have a interlock issue, maybe a cab switch or lap bar switch.
Try jumping your interlock relay, pins 30 to 87, and see if the machine will move
 
K

Kcorey

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Joined
Jun 24, 2018
Messages
18
Location
Madison
GaryHoff said:
Kcorey, sounds like you have a interlock issue, maybe a cab switch or lap bar switch.
Try jumping your interlock relay, pins 30 to 87, and see if the machine will move
Click to expand...

All three green lights are on in upper right hand display. i will give jumping the relay a shot, previous owner brought machine to a equipment repair shop and they diagnosed it as a bad hyd coupler, but i winched machine onto my trailer brought it home , started machine and i had hydraulics for a minute, then shut machine off and now no hydraulic function again.
 
Stevechari

Stevechari

Member
Joined
Oct 3, 2016
Messages
12
Location
Dawsonville Ga.
Occupation
mason
No my 85xt is still not moving. As far as I can tell is that all 3green lights are on. I am now wondering if the last one is on or is it glowing off the other ones because it real dim. Any way I jump the relay and it still not move. Bucket moves up and down good. Break parking light is still on. I have power to it for sure. I have power to my NOR solenoid. My cage switch is jumped. Seat switch is jumped. I jump the relays. Now coupler. Where’s it located and dose yrs have wires to it. If it’s were I think it is and mine have two wires to it and they are cut. Worth looking at. I sure thank u for yr alsome help.
 
Stevechari

Stevechari

Member
Joined
Oct 3, 2016
Messages
12
Location
Dawsonville Ga.
Occupation
mason
Kcorey said:
All three green lights are on in upper right hand display. i will give jumping the relay a shot, previous owner brought machine to a equipment repair shop and they diagnosed it as a bad hyd coupler, but i winched machine onto my trailer brought it home , started machine and i had hydraulics for a minute, then shut machine off and now no hydraulic function again.
Click to expand...
Kcorey said:
All three green lights are on in upper right hand display. i will give jumping the relay a shot, previous owner brought machine to a equipment repair shop and they diagnosed it as a bad hyd coupler, but i winched machine onto my trailer brought it home , started machine and i had hydraulics for a minute, then shut machine off and now no hydraulic function again.
Click to expand...

Stevechari said:
No my 85xt is still not moving. As far as I can tell is that all 3green lights are on. I am now wondering if the last one is on or is it glowing off the other ones because it real dim. Any way I jump the relay and it still not move. Bucket moves up and down good. Break parking light is still on. I have power to it for sure. I have power to my NOR solenoid. My cage switch is jumped. Seat switch is jumped. I jump the relays. Now coupler. Where’s it located and dose yrs have wires to it. If it’s were I think it is and mine have two wires to it and they are cut. Worth looking at. I sure thank u for yr alsome help.
Click to expand...
Stevechari said:
No my 85xt is still not moving. As far as I can tell is that all 3green lights are on. I am now wondering if the last one is on or is it glowing off the other ones because it real dim. Any way I jump the relay and it still not move. Bucket moves up and down good. Break parking light is still on. I have power to it for sure. I have power to my NOR solenoid. My cage switch is jumped. Seat switch is jumped. I jump the relays. Now coupler. Where’s it located and dose yrs have wires to it. If it’s were I think it is and mine have two wires to it and they are cut. Worth looking at. I sure thank u for yr alsome help.
Click to expand...
 
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