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Hydraulics question

Joe Ferguson

Joe Ferguson

Member
Have a 1965 Ford 2000 diesel 3 cyl tractor with FEL.
Hydraulic very slow in cold climate.
When I operate the loader after engine warm-up once
it has raised few inches it operates at normal speed
and the bucket cylinder operates normaly.

But if I put it down completely it takes 30 seconds to 1 minute to start
raising once it raised few inches it is ok.

Short story: when there is pressure on cylinders (loader weight)
it operates OK...no pressure (loader weight) long time to start raising.

Any ideas ?

Thanks in advance

Joe
 
Our JD 4600 bucket is like that sometimes, almost like there is an air pocket in it, only when you go to a zero pressure situation, otherwise it works great
 
Cold thick oil moves slower than hot thin oil. You have an "Open Center" hyd system.When you drop the boom, it cavitates the cylinder a bit and it takes a moment to refill it. I bet you don't move so fast on a cold morning either.
Loren
 
Either you have air in the line/cylinders or low oil level and possibly a plugged filter I would start with the filter then move to the level then bleed the lines.
 
Common thing to happen because when you let the loader down all the way it tend to go down pretty fast and pushes more fluid out of the cylinder then it has in it so it then has an air pocket so the hyds start out slow at first. Now if you let it down say all but 2 inches shut if down then drop it the next time it is likely to work a bit faster
 
In theory if you have double acting cylinders when you go to lower the loader the pump should force the loader down. You should go to a hydraulic supply house and get an adjustable flow control that can be adjusted to control the rate of drop but still allow full flow on the raise circuit. It will work on single acting cylinders too. Questions?
 
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