open hydraulics

[Tinhack]

Could it be possible that I have the centre valve that puts fluid into the ports located incorrectly ? . My pressure gauge is off the “p” port .

That's why you only read 30-40psi. The P port is the pressure Input to the valve. Teeing on that port will only have "Return" pressure until the valve is activated to send pressure to something through one of the Output ports. That something must Also be locked, blocked or at full extension to test pressure.

You have to "dead-head" a port to test pressure.

 

[Mudfarmtruck]

So my 3 point hitch is working under load . Could this be something stuck with the flow priority valve ? I need to read more about the oil passages .

 

[oldnslo]

When lifting a load on 3 point what pressure do you see on gauge you have plumbed into the “P” port of loader valve?

 

[Mudfarmtruck]

For whatever reason my draft link at the bottom can be seen dripping slow drips of hydraulic oil. Also I have this icon on my dash (unsure why ) . From the back , the switches allow me to lower and raise the 3 point hitch . Still no loader valve . Taking the timing to de-grease everything. It is a slow process . Stuck or failing valve somewhere ??

 

[Mudfarmtruck]

Sorry for the late reply . As for the update . Only getting low pressures on the gauges. The 3 point hitch goes down , but won’t lift with 2-300 lbs on it. I have noticed some leaks which I’m working to mitigate . I don’t think it’s the pump but I can’t say for certain . My next guess would be the pressure relief valve . It’s worth looking into .

 

[oldnslo]

Since neither the FEL nor 3 point is working checking the system relief would be next logical step but a little unusual for relief to fail completely open but anything thing is possible.

On your tractor is it a direct hose or steel direct from pressure port on the pump to loader valve or does it connect to a block on tranny housing first? If to a block is there any plugs or fittings in that block that could provide leak path to tank?

 

[Mudfarmtruck]

The power steering pump hard steel lines with rubber lines closer to the front of the machine . The 3p / loader pump there’s a 3/4” hose from the top of the pump to the loader valve. The suction lines from tank to pump are all steel, with o rings bolted to their respective hook ups( not the greatest design). I am still working on degreasing the machine . I’m hoping to find answers soon .

 

[oldnslo]

Simple test to try if it implement pump is accessible. Try operating a function like curl fully and hold joystick in that position and if possible check pump housing temperature vs suction line temperature. If housing gets significantly hotter than suction line indicates pump is leaking internally.

Note: Normal for housing to be a little warmer than inlet but should not be a significant temperature difference.

 

[Mudfarmtruck]

I

Simple test to try if it implement is accessible. Try operating a function like curl fully and hold joystick in that position and if possible check pump housing temperature vs suction line temperature. If housing gets significantly hotter than suction line indicates pump is leaking internally.

Note: Normal for housing to be a little warmer than inlet but should not be a significant temperature difference.

I used a mechanics stethoscope on the pump and I hear kind of a wheezing /whirring noise. I’m going to do what you just talked about now .

 

[Harry in Ky]

You're just running in circles with what you're doing and wondering what to do next. What you need here is a flow meter, not a stethoscope. Who really cares what the pump sounds like, what is it actually doing? By all indications, the pump probably IS the problem. The only way to prove that one way or the other is to test it. Flow meters are not typically found in the homeowner tool box, but most trained mechanics either have or have access to one. I've had one for years and still use it a few times a year. Maybe it's time to bite the bullet and call in some qualified help. It might be worth it.