Tx Jim
New Member
I recommend unlocking nut & turning(CW) stroke control valve adjusting screw into hyd pump while monitoring hyd gauge. Stand-by pressure should be 2250-2350 psi.
rScotty
Super Member
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- Rural mountains - Colorado
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- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
Do you think that the lower pressure is the reason why the 3pt quit working? Or are they different problems?
Just to keep things simple, my thought is that 1000 psi is still plenty to make the 3pt work. I'd not mess with compensating for pump wear until figuring out the 3pt problem. It sounds to me like you still have an internal leak back there.
rScotty
Tx Jim
New Member
If pressure control valve is functioning as designed rockshaft & scv's should stop functioning when stand-by pressure dropped below 1700 psi.
rScotty
Super Member
- Joined
- Apr 21, 2001
- Messages
- 9,504
- Location
- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
Really? Well, that just proves what I said earlier in the thread .... that a person like myself can understand open center hydraulic systems well, and still not know the first thing about Closed Center systems like many John Deere ag tractors use.
For comparison, in an open center system, there is no pressure control valve and no lower limit at which a system just stops functioning. As pumpn pressure drops in an open center system, the cylinders simply lose force at a the same rate until finally there isn't enough force to overcome gravity.
I haven't measured it, but that's probably somewhere around 100 psi for 3pt arms.
I did measure one open center FEL, and that one took about 600 psi just to lift an empty loader bucket.
rScotty
