Rear remote leak down

[Curtis Gray]

A year ago, I bought a new Kubota MX5100 tractor. About 6 months ago, not wanting to drive the 55 miles to the tractor dealership to install a single set of rear remotes, I opted to order the kits, and do the install myself. It took about a day to complete the install, as I was very careful to follow the (very meager) directions that accompanied the Kubota kit. Several weeks later, I installed my brand new Fit-Rite hydraulic cylinder as a replacement for the turnbuckle top link. The set up is connected to a quick hitch. It seemed to work very well. Later, after connecting a box blade to the quick hitch, I noticed that after maybe 30 minutes to a hour, the rear of the box blade is no longer paralell to the ground, as it sags downward. Since then I connected a straight blade and while ditching, noticed that the shaft on the cylinder moves inward as pressure is applied. I then disconnected the 2 hydraulic lines at the remote bank, and continued my ditching project, noticing that the cylinder shaft maintains it's position, and does not retract with pressure.

I now assume that the problem is not in the cylinder, but probably in the valve that I installed. Any ideas???

Thanks.

Curtis

 

[J_J]

Using a cyl spool, the cyl is supposed to lock the cyl in place, and the only things that could change that is cyl seals leaking, or spool leakage.

If there is a lot of weight on the cyl, and a fitting is not tight, it could suck in air.

Not exactly sure what trash in a load check valve would do to a cyl, might leak down also.

 

[Tx Jim]

It is possible that the machined area on the spool &/or the housing is too great so there's a small amt of leakage. I know on some of JD's newer tractors(6715) one needs to order the premium remote control valve so as to get a built in check valve so as to eleminate a problem such as your incountering

 

[MtnViewRanch]

Curtis, at what rate does the cylinder fall? Lift the implement and how much per hour does the cylinder fall? Seems like if it is where it affects the use, that it should be covered under warranty. :confused3: I would call your dealer and at least ask, but you should have the leakage rate on hand in case that is asked.

Good luck.

 

[Curtis Gray]

Thanks for your replies thus far. This morning, I tightened tips on the 2 hydraulic lines, then grabbed a disc harrow with the quick hitch, retracted the top cylinder to it's maximum position, and marked the time. In the first hour, the cylinder shaft extended 9/16 of an inch. Ill update further during the day.

Curtis.

 

[J_J]

Perhaps the seals in the new cyl are not as good as the manufacturer thinks.

Do you have check valves on that cyl?

 

[Curtis Gray]

No check valves

 

[Tx Jim]

Perhaps the seals in the new cyl are not as good as the manufacturer thinks.

I copied & pasted this statement from Curtis's original post which should eliminate the cyl as the problem.
[/quote]I then disconnected the 2 hydraulic lines at the remote bank, and continued my ditching project, noticing that the cylinder shaft maintains it's position, and does not retract with pressure.[/quote]

 

[Curtis Gray]

After 3 hours, the shaft extended a total of 1-7/8 inches. That is 5/8 inch per hour.

Also, as implied in the above post by Tx Jim: does disconnecting the hydraulic hoses from the cylinder and the cylinder maintaining it's position, rule out cylinder being the problem? Thanks

 

[Tx Jim]

Yes if you disconnect cyl from tractor and cyl stays where it's set then cyl isn't the problem