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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 410 Hydraulic Troubles

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Ron Pritchard

08-07-2006 11:46:00




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I purchased a '78 JD 410 last Fall and have started going through the hydraulics. I replaced the pressure control valve, the boom valve, and rebuilt a couple cylinders, the hydraulics are pretty strong now. However, recently the engine has begun to loose power intermittenly as if it is being overloaded, even though the tractor is just sitting there. If I move either the loader or backhoe the engine regains power. I'm thinking it might be a pressure relief valve sticking. Does this sound right? Any other suggestions?

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jdRick

08-08-2006 00:24:23




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 Re: JD 410 Hydraulic Troubles in reply to Ron Pritchard, 08-07-2006 11:46:00  
Ron, it sounds like the hyd system has an open circuit, high pressure leak, which keeps the pump in stroke. A quick check is too destroke the pump manually while running. This will relieve the eng load. On top of the hyd pump there should be a screw with a roll pin in it, screw it in a little after you feel resistance to destroke the pump. The eng load will be relieved if the problem is hyd. Now, remember to back out the destroke screw.
If so, the hyds have an open(leak), most likely the steering valve on that machine. If its a big internal leak, sometimes all you need to do is start the eng and the steering valve will warm up to the touch on the outside housing below the steering wheel. To further check it, isolate the valve by removing and plugging the steering valve supply hose. If I remember correctly, its on the bottom left side of the steering valve and comes from the hyd accumulator. On restart, the eng load will be gone if this is the problem. If so, remove and reseal the valve(the o-rings on the internal valves are likely blown).
I hope that solves your problem, if not I"d have to find my book and refresh my memory.
Good luck, Rick

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