SevenCorners
Silver Member
hewlp My 3 Pt does not go up. Arg.... I tried changing oil but no help. Could it be the o-ring?
problem
- Thread starter SevenCorners
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Soundguy
Old Timer
- Joined
- Mar 11, 2002
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- Central florida
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- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
Does yuor power steering work? ( do you have power steering? )
what tractor is this on?
Loader?
Soundguy
what tractor is this on?
Loader?
Soundguy
RonMar
Elite Member
2004 Jinma 224 with loader(it is in his profile)
IF the loader and power steering are working, then you have flow from the pump. I think if it was an "O" ring, it would at least try and lift the arms without an impliment, but it wouldn't stay up if any weight was applied to the arms. What is the status of the 3PH speed control valve located in front of the seat? Is it fully clockwise(closed) or fully counterclockwise(open)? On some of the Jinmas, that valve knob has two functions.
1. Regulates downward speed of a heavy 3PH impliment.
2. When fully closed the valve restricts the flow into the 3PH cylinder completely and sends the pressure instead to a rear remote port to allow the control of a remote single acting cylinder such as in a dump trailer. With the valve knob closed, the 3PH arms won't move.
IF the loader and power steering are working, then you have flow from the pump. I think if it was an "O" ring, it would at least try and lift the arms without an impliment, but it wouldn't stay up if any weight was applied to the arms. What is the status of the 3PH speed control valve located in front of the seat? Is it fully clockwise(closed) or fully counterclockwise(open)? On some of the Jinmas, that valve knob has two functions.
1. Regulates downward speed of a heavy 3PH impliment.
2. When fully closed the valve restricts the flow into the 3PH cylinder completely and sends the pressure instead to a rear remote port to allow the control of a remote single acting cylinder such as in a dump trailer. With the valve knob closed, the 3PH arms won't move.
Affordable
Advertiser, Platinum Member
If your steering and loader is working you will prob. need to rebuild the 3-point o-ring kit.I have also seen a few lift valves go out.First make sure you have flow from the pump.Installing the 3-point O-ring kit is not a real hard job,we sell a rebuild kit.
Tommy
Affordable Tractor Sales
Tommy
Affordable Tractor Sales
heartservant
New member
Would this also be the same type of repair if it lifts but slowly lowers it self? Just another problem I have to deal with.****James
RonMar
Elite Member
heartservant said:
James
Is it the same type tractor? If it is a Jinma 200 series, you can probably quite easilly eliminate if it is the "O" rings or the loader control valve. That speed reg valve is located between the loader control valve and the cylinder. If you raise the 3PH then close the speed reg valve all the way, you will trap the fluid in the cylinder. If it still leaks down, then most likley you have an "O" ring problem as the fluid is most likley leaking past the piston seal/o-ring. If the 3PH stays put, then the "O" rings/piston seal are OK and the problem is a leaking control valve or the 3PH overload safety(protects the structure when you bounce a heavy impliment by venting cylinder fluid back to the resovoir).
This test is best done with a lighter or fairly easilly jacked impliment as when you screw that speed reg valve closed(clockwise) with an impliment in the air, you may have trouble opening the speed regulator valve back up till you jack up the impliment. The fluid flows upward past the valve seat and into the cylinder. With a load on it and the valve closed, the hydraulic pressure holding the load in the air is on top of the seat and you need to unscrew the valve against the pressure and this can be difficult, even will well lubricated threads. By jacking up the impliment with a floor jack, you are removing the hydraulic pressure from on top of that valve and it should then unscrew easilly.
