hydraulic cylinder question

casual jon · Oct 7, 2023

i have a 966 international tractor with a 565 koyker loader on it when i curl the bucket in it will uncurl fairly quickly , was told to let it un curl all the way fairly close to ground with tractor off un hook the return line on one cylinder start tractor back up and curl bucket back in and see if it leaks at cyl or the hose is leaking if oil pours from cyl then its bypassing on inside if hose pours it will be oppisite side. ican find no leaks external, which hose is the return hose on the cyl. i am not very mechanical either. Lol
thanks for any advice you have.

rustred · Oct 7, 2023

Its quite easy to figure out which way is which. Look at
which hose is pushing out on the back of the piston in the
cylinder , that will be extending the cylinder. Then go
about your thing. If the cylinder is dead headed and there
is still oil coming out the other outlet you have leaking
pistons seals. If the seals are good u will have no oil
coming out opposite outlet. Your return is always
opposite the pressure hose, which depends on which
direction you are functioning the cyl.

used red MN · Oct 8, 2023

Hello Jon welcome to YT! If the hoses just plug in the
tractor the first check I would do would be to lay the
bucket with the bottom flat on the ground and
disconnect both bucket hoses and raise it. If the
bucket does not hold at that spot within reason one
cylinders or both cylinders are bypassing. If it does
hold the problem is in your tractor remote valve. The
way you have interpreted the explained check which
will narrow it down to the problem cylinder you are
setting yourself up for a shower of hydraulic oil. When
you do the test you will again move the valve to uncurl
or dump the bucket. To curl the bucket back you would
have to apply pressure to the hoses you are
unhooking. Just to be clear I looked at a 565 for sale
online and it is designed the same as most loaders the
connection you want to unhook is the on the end of the
cylinder the ram extends out of or nearest the bucket
hinge point.

caterpillar guy · Oct 8, 2023

If you just put ball valves on each end of each cylinder with the bucket curled in shut off valves and raise loader. If the cylinder leaks the bucket will sag down. IF it holds then let one set of valves open if it still holds switch cylinders. IF it now holds it is in valves that control the bucket. If it sags down then the cylinder or cylinders are suspect. To really determine which cylinder it is you will need to unpin one cylinder as you do the switch from one cylinder to the other.

used red MN · Oct 8, 2023

The way he was told will do the same thing without monkeying around with those valves or unpinning the cylinder. He just risks getting a little hydraulic fluid on him if the cylinder has a fairly high leak rate. If he had a hose to connect to the port on the cylinder he disconnects to direct in a bucket he could eliminate the chance of getting oiled. The only thing the test will not tell him would be if the packing by some slim chance is leaking by one direction and not the other.

hydraulic cylinder question

casual jon

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rustred

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used red MN

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caterpillar guy

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used red MN

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