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My jinma 284 front hydraulics (fel – steering) stopped working. I checked fluid level. It was low but not dramatically so. I filled it up – no change. Hyraulic pump was very very hot to the touch. I shut it down for a while and restarted a couple of times with the same results. Any suggestions about the cause and the fix.
Thanks
Ed Shea
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It sounds as though you have some obstruction in the system somewhere, causing the pump to work against too much head pressure, heating it up. My first guess would be the quick disconnect couplings if your loader is equipped with them. The Chinese OEM QD couplings are notorious for failing and causing the pump to deadhead, which it sounds like it is doing.
I'd start by disconnecting the output hose from the pump and *briefly* letting it pump into a bucket so yo can see the output flow is good. Then you need to check each component of the whole system to find the culprit.
Another thing to do would be to remove the loader QD's from the system. disconnect the hoses from the loader and connect them together to complete the circuit. If the QD's are bad on the loader side, the steering will now work and the pump won't overheat. If they're bad on the pump side, then there will be no change. Next step would be to eliminate the QD's by direct coupling the hoses with Sch. 80 plumbing fittings. If that works, then order some better quality aftermarket QD's from one of the dealers here.
If none of that does any good, the next place to look would be the priority valve or diverter valve, whichever you call it. Last place would be the steering motor/controller, but I doubt that. Start with the common ones first and see what you find. Obviously, don't continue to use the tractor with this condition or you'll blow the pump.
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I'm not 100% certain on the 284 with the single pump setup – my 304 has two pumps. But somewhere in the hoses between the hydraulic system and the loader controls there may be a pair of QD's – they look like hose couplers on steroids. Same concept as the ones on air hose or some garden hose setups. They are (or should be) two identical pairs that are set up backwards of each other so that when you uncouple the two of them the hoses going to the loader control can be hooked to each other to keep dirt out and the hose sections going to the tractor can be hooked to each other to maintain the closed loop hydraulic system.
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