T650 code m1607 -- Traction lock solonoid open circuit

[Tx641d]

Needing some detailed guidance on the steps to resolve this. Machine is new to me, so this is my firat aervice issue. Thanks in advance!

 

[Bswwood]

The T650 will not have a traction lock solenoid but it will have brake coil and stem that opens and let's charge pressure flow to the brakes in the motors to release. First check the fuses and swap the brake relay with a known working relay. If you raise the cab, you will see an aluminum manifold in the center of the machine. The brake solenoid will be on that valve. Cleck the plug and wiring for any obvious issues.

 

[MarkKuehn]

The T650 will not have a traction lock solenoid but it will have brake coil and stem that opens and let's charge pressure flow to the brakes in the motors to release. First check the fuses and swap the brake relay with a known working relay. If you raise the cab, you will see an aluminum manifold in the center of the machine. The brake solenoid will be on that valve. Cleck the plug and wiring for any obvious issues.

I have the same issue on a T550. The dealer replaced the brake solenoid about a month ago, but now it is happening again. If I leave it sit overnight the fault clears. The failure only happens if I've been using the machine for a couple of hours. Fuses are good. Any ideas?

 

[MarkKuehn]

I have the same issue on a T550. The dealer replaced the brake solenoid about a month ago, but now it is happening again. If I leave it sit overnight the fault clears. The failure only happens if I've been using the machine for a couple of hours. Fuses are good. Any ideas?

I fixed it by swapping the glow plug relay for the traction parking relay and all is working again. A $45,000 machine rendered immobile over a $10 relay. I'll order two $10 relays to swap out the bad one and keep one one hand as a spare.

 

[ozarkag]

I fixed it by swapping the glow plug relay for the traction parking relay and all is working again. A $45,000 machine rendered immobile over a $10 relay. I'll order two $10 relays to swap out the bad one and keep one one hand as a spare.

Good to know, swapping parts is smart mechanicing. I have seen the solenoid coil itself fail. Located under cab, in center of machine, on top of "chaincase". Aluminum manifold block with "traction lock", or more accurately park release solenoid, and the two speed solenoid, ( if equipped). A good solenoid coil will ohm roughly 8-12 ohms.