Hydraulic Cylinder help needed

ocholagos · Jun 18, 2009

cylinder were just rebuilt.
1 of my cylinders retracts completely before the other side starts to move.
this is on the bucket for a front end loader ?
was told to work them back and forth to get air out, but that didnt work.

kennyd · Jun 18, 2009

This is normal if the two are not mechanically tied together. What machine are we talking about?

Wayne County Hose · Jun 19, 2009

Like Kenny said, completely normal. Hook everything up and run them all the way in and out 5 times and you will be back to normal.

J_J · Jun 19, 2009

If the cylinders are connected to the bucket and frame, both cylinders will push and retract at the same time. If you keep extending and retracting, the air will eventually be pushed out, and you will have full force.

ocholagos · Jun 22, 2009

Its a japanese tractor, TYI 80hp.
The cylinders have been rebuilt 3 times and continue to start leaking.
I was thinking maybe 1 side was doing all the work causing both to leak eventually ?
I used a different company this time, and he said it looked as if they were not rebuilt properly, but I will wait and see ?

Thanks

Wayne County Hose · Jun 23, 2009

Ask this place if they test the cylinders after rebuild.

pat32rf · Jun 30, 2009

If this is happening before the bucket is installed it just means that one side has a little more drag than the other. If you push on one cylinder to compress it, the other should extend about the same amount. Get them lined up close enough to install the bucket then try them for function. Any air should go away in a few cycles.
Not familiar with your tractor but JD ties the two cylinders together with a steel rod to prevent this when changing their QD buckets. However there is a 1/4" bolt thru the rod that always shears off. You might have the same arraingement....and sheared pin

J_J · Jul 1, 2009

If both cylinders are connected to the bucket, and one cylinder is retracting before the other, would that not completely warp the bucket. If they are connected correctly, you have the same pressure on both cylinders, and even if you have some drag on one cylinder, both cylinders will extend, or retract, since they are mechanically in alignment. If you put a gage on the cylinders, then you would see which cylinder is working the most. The cylinder with the highest pressure will have the greatest resistance. and you might not see much difference in pressure. Maybe there is a good reason that the cylinders have been rebuilt three times, maybe just worn out, or the tubes have some deep scratches. You can test them your self, by extending or retracting them all the way until the relief valve goes off, and if they are not leaking, then you know they are good up to the pressure limit on the relief valve. If the relief valve does not go off, then one or both cylinders are bypassing internally to some degree.