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1966 diesel Ford 2000 hydraulic

B

Bart CA

Member
Loader operating with the original pump side of the engine.

When I want to raise the loader by pulling the spool valve handle no action.

If I operate the bucket cylinder for 2-3 seconds while holding the spool valve the loader will raise.

When the loader is raised at any position it will operate normally.

If I get the loader down I have to operate the bucket cylinder again 2-3 seconds to raise the loader.

As long the loader puts a down pressure on cylinders it operates OK

But bucket on the ground (no down pressure) I must operate bucket cylinder to raise.

When operating rising speed is normal and pressure is @ 2100 PSI


Any ideas ???


Thanks in advance


Bart
 
if holding in raise when on the ground won't raise it at all, ( hold for 5-6 seconds at least ) unless you kick another ?

This could be the valve.

is this a top cover valve? power beyond plate? diverter?
 
So you're saying that the bucket cylinder works correctly, and the lift cylinders only work when they have gravity pressing down on them, or if you also play with the bucket cylinder when there's no gravity pressure? Definitely sounds like something inside the control valve. Maybe an o-ring is worn to the point where it needs a certain amount of pressure in one direction to seat properly in its groove and then it works until that pressure goes away. I would start with rebuilding the control valve.
 
Another thought... if it has a float position on the lift spool, then the spring for the float position might be broken, allowing it to float when it's not supposed to, and the pressure of gravity or playing with the bucket cylinder compensates for the broken spring and allows it to pop out of float mode.
 
ya know, kinda.. reminds me of a pilot operated valve I had on my 7610s. one remote would ONLY work, if you pressurized the other remote ( then both would work ). the 'bad' one had a defective pilot circuit.
 
I would swap hoses, bucket cylinder to loader valve and loader cylinders to bucket valve and observe operation.
 

Hookup: Hose from diverter valve to spool valves.

As suggested I will swap bucket/lift hoses and try another spool valve


Thanks to all for your replies
greatly appreciated


Bart
 
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