Bucket droop

[Evets Tsorf]

Dave thank you, not having a pocket full of caps and plugs I assume this check could be done by simply disconnecting quick disconnects at control valve. Would not isolate individual actuators but could rule out supply side issues from actuator issues.

 

[Dave M7040]

I am not certain you can perfom all tests just disconnecting quick connects as some tests require one of a cylinder's ports to be open.

It is rare for a control valve to cause these problems. They have no internal seals being manufactured to such tight tolerances between the spools and the valve body that no leakage occurs.

Dave m7040

 

[dapeake]

Steve, Did you ever figure this out? I have a JD 650 with a model 67 loader and my bucket sags too.

Dan
Campbell / San Jose (Right over the hill from you!)

 

[art]

Loosen the hoses on the cylinder on the dump side and see if they are leaking by while the bucket is rolled back. Simplest way to find out if it is the cylinders.

 

[Evets Tsorf]

Dapeake,

Have not had that much seat time recently other house projects got in the way. I had changed fluid and cleaned the fliter, also rebuilt left bucket lift cylinder, the last time I drove it the droop seemed decreased, may have had some air in system. Unfortunately I noted the cylinder I just resealed is dripping again, had a heck of a time getting the main seal (polypack) in place it was just to inflexible. Did get it in but the o ring kept popping out of the seal when trying to wrestle it in place. Got it stuffed back in place but may have cut the o ring.

Would love to see your 650 if it has ROP's, I acquired a 650 Bar and am trying to understand how it attaches. There is a difference between the 650 and 750, but not being able to find a 750 bar I felt I could modify the 650 unit as most dimensions are the same they just mount differently. I my office is at the San Jose airport and I drive through Campbell every day. PM me and maybe we can get together.

 

[Cperk]

Mr.4720, Drop significant. will drop a couple feet in five minutes. May consider putting a heavy load in bucket, raise bucket and shut off tractor and see if I can hear internal leakage with a stethoscope.

The rebuild kit I received from JD had a really hard seal for the inner piston, I struggled getting this in place as it was so stiff, it had an "o"ring in the back of the seal that kept popping out. We where able to message it back in place, hope it did not get cut in process.

View attachment 608582

That is Mount Lassen in back ground.

Beautiful view!