I have owned this machine for 50 operating hours. H-pattern pilot controls. I am looking for some advise as to what to do next. I lost hydraulic pressure on a slightly uphill slope. got a charge pressure warning illumination. I had tilted the bucket down to unearth a small tree, and was creeping forward to curl the dirt and pull the tree loose. I had not checked the fluid that da,, but had noticed the day before that the fluid level was good, and the fluid was a little darker than usual (only ran it for about 2 hours the day before). When I lost power, I checked, and level was fine, but fluid was dark. Drained the tank thinking that either clogged up a hydraulic filter ( since it was the only one I had not changed) or that the sensor for the charge pressure was bad. When I drained the fluid, it had some metallic/shiny to it. The only way to describe is it was similar to clutch/gear material that you would see when emptying a differential in a car though not as many parts per million of metal if you will. I now believe there is some trash in the hydraulic tank as well since the machine sat for 3 years prior to me owning it. Learning expensive lessons on how important some things are on these. I only got about 6 gallons of oil out of the reservoir even though the oil was in the middle of the sight glass... When filling, it took 8.5 gallons to get back to middle of the sight glass. Fired it up and nothing. Thought that the slope had something to do with priming/ gravity feeding to the hydraulic pump, so added another 1.5 gallons to get to 10 total. Still nothing. So I put in a new charge sensor on the filter manifold. Nothing. Cracked the hydraulic filter and started. no oil came flooding out. Next cracked the high side hose from the hydraulic pump to distribution block??? mounted on the passenger side and started the engine. Nothing. Took the hose clamp loose on the feed line to the hydraulic pump. There was oil present/ running out with the clamp just loosened. So I know there is at least oil in the pump and hose.
Long story to get to where should I go next? I have the repair manuals, and have a basic understanding of hydraulics, but dont want to throw parts. I plan on pulling the hydraulic pump tomorrow, and looking at the gears/shaft tomorrow (could be the reason for the fine metal in the oil). Is there anything else that I should look for? I cannot test the hydrostat without hydraulic power can I? Is there an assumption that the hydrostat will be bad if the hydraulic pump shelled? Is it possible that there is something broken in the hydrostat that would cause the pump to not turn? What should I be looking for?
I had initially planned on just starting this up with the new oil, and letting it circulate for half an hour then draining and refilling and changing the filter again to try and flush the system, but reading more, I dont know if that is a great idea. Its what I would do with a transmission or motor that was rebuilt. Now planning on changing the tank suction filter as well.
Any advise would be of help.
Thanks,
Cfry
Long story to get to where should I go next? I have the repair manuals, and have a basic understanding of hydraulics, but dont want to throw parts. I plan on pulling the hydraulic pump tomorrow, and looking at the gears/shaft tomorrow (could be the reason for the fine metal in the oil). Is there anything else that I should look for? I cannot test the hydrostat without hydraulic power can I? Is there an assumption that the hydrostat will be bad if the hydraulic pump shelled? Is it possible that there is something broken in the hydrostat that would cause the pump to not turn? What should I be looking for?
I had initially planned on just starting this up with the new oil, and letting it circulate for half an hour then draining and refilling and changing the filter again to try and flush the system, but reading more, I dont know if that is a great idea. Its what I would do with a transmission or motor that was rebuilt. Now planning on changing the tank suction filter as well.
Any advise would be of help.
Thanks,
Cfry