Liebherr 631B Crawler Loader Hydraulic question

   / Liebherr 631B Crawler Loader Hydraulic question #1  

Yehusha

New member
Joined
May 24, 2025
Messages
3
Tractor
Liebherr 631B, JD 110, Case TR310, Terex 5519
Hello,
I recently purchased a Liebherr 631B that runs fine but it needed new batteries, so I put a new set in and assumed that the switch solenoid was the positive cable, of course it wasn't, which I discovered after some smoke and sparks when I turned the ignition switch on. I melted out a 10 gauge wire that runs to the alternator and starter by the time I got the battery cable off but otherwise things seem fine. Now my loader hydraulics don't work, I can cycle the two loader valve solenoids on the right side under the loader arm by running power to them but the hydraulics still don't run. The loader drives but I can't get the loader activated. I'm not seeing any other solenoids that might be connected. Has anyone had anything similar happen?
Thanks,
 

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