skid steer hydraulic issues asv rc 50

Daniel

Daniel

Carpal tunnel level member
Location
Suburban Philadelphia (Wayne)
One of my guys put this machine on its ass. The hydraulic oil leaked out and after righting the machine, we got it running and let it run at idle for about 20 minutes. After which we put in hydraulic oil and it seemed to run fine, but would lock up occasionally, as it moved as if someone stepped on the brakes, jerking for a second, then continuing to run fine. I figured it was just air in the system. Kept running it for a few jobs and it seemed to run without an issue for a few jobs. The jerking stopped.
Then on the last job, it would lose all control temporarily. The hand controls for both steering/drive, and the bucket would go limp at the same time. I'd let it sit for a few minutes and then it would return to normal operation. I then limped it around, running at low RPMs and going slowly over bumps. The bumps or any jerking would definitely cause it to lose hydraulics. But it managed to get through the job.

The shop has had it for too long now and I need some help. They think it's electrical causing a valve to stick possibly or could be a bad pump...

Your thoughts and suggestions are appreciated....
 
Daniel said:
One of my guys put this machine on its ass. The hydraulic oil leaked out and after righting the machine, we got it running and let it run at idle for about 20 minutes. After which we put in hydraulic oil and it seemed to run fine, but would lock up occasionally, as it moved as if someone stepped on the brakes, jerking for a second, then continuing to run fine. I figured it was just air in the system. Kept running it for a few jobs and it seemed to run without an issue for a few jobs. The jerking stopped.
Then on the last job, it would lose all control temporarily. The hand controls for both steering/drive, and the bucket would go limp at the same time. I'd let it sit for a few minutes and then it would return to normal operation. I then limped it around, running at low RPMs and going slowly over bumps. The bumps or any jerking would definitely cause it to lose hydraulics. But it managed to get through the job.

The shop has had it for too long now and I need some help. They think it's electrical causing a valve to stick possibly or could be a bad pump...

Your thoughts and suggestions are appreciated....
Click to expand...
It could take some time to get all of the air bubbles out naturally. I have a brand new mini skid, a larger 40 hp unit, that had a faulty lift cylinder right off the truck. I have put several hours on the machine since it was replaced and it still dead heads inconsistently like that. Your hydraulic tank runs at probably 3-5 psi. If you unscrew the fill cap and track it around on level ground and cycle the functions it will help the air bubbles surface in the tank. You probably introduced way more air into the system than that one small lift cylinder of mine did. Hope that's your only problem.

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The shop could be on the right track,

Attach a voltmeter to different locations on the machine and see if the voltage is jumping when the problem occurs. You could have damaged the battery or connections when it flipped. Also of course go around and wiggle connections and look for any damage to the wiring....does the battery have a proper hold down or was it hanging by the cables when in was upside down?

Or of course it could be air in the system or something really stupid like a piece of material floating in the reservoir and blocking a passage intermittently.....really hard to cover all the possibilities from a keyboard.
 
PS also agree with the post by Wes, sometimes bubbles are tiny and surface tension will cause them to adhere in remote locations and until they are dislodged they will compress and cause problems.
 
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