JD 430 Loader Hydraulic Problem

[jgbanshee]

I am having problems with my 430 loader on my 4300. When raising the loader up in the air I leave off the joystick for a second the loader drops. Then when playing with the joystick a bit I noticed that if I pull back on the joystick slightly the loader will actually begin to fall instead of raising. Anyone know what the problem is?

 

[RoyJackson]

Fluid level OK?

(ADDED) I didn't catch that line about letting off the stick and the loader dropping. Sounds like you might be getting to the cylinder rebuild time.

 

[jgbanshee]

Looking at the sight glass by the rear PTO, the level looks good.

The loader also seems to move slower too.

 

[KWentling]

Load check sticking?
That would be my guess

Kim

 

[jgbanshee]

What is load check?

 

[kennyd]

What is load check?

The load check is in the valve, it keep the ports blocked until there is positive pressure so the cylinder does not move.

It is part # 53 in the diagram below. If you are lucky, there is just a piece of debris in it...If you do not have the service manual, I will suggest you get one soon.

 

[jgbanshee]

I removed the Load Check that is inline with the chrome shaft that works the up and down loader movement and found no debris in there. Put it back together and still the same problem. Slow moving and about a half inch to and inch drop when I release the joystick. I assume that I took the correct Load Check out to clean. The bucket rollback and dump work great and at a normal speed. What else can I try?

 

[kennyd]

What else can I try?

Getting the manual and stop guessing?

 

[jgbanshee]

I have the manual and I thought I check the correct load check. Please tell me if I am wrong. Attached is the 3-spool diagram. The Load Check consists of a cap, o-ring, spring, and plastic cylinder. Everything was free of debris as well as the port hole.

 

[kennyd]

Possibly it is worn ever-so-slightly. There is not a procedure for verifying it's operation in the manual?

 

[jgbanshee]

Just switch the Load Check valve for the up/down with the curl/dump valve. Nothing changed. I think that I could say that the Load Checks are good and working. While testing the loader just now up/down, the loader will not pick the front end of tractor off the ground like it used to. Finally I put the loader all the way down with the bucket flat on the ground and dumped the bucket enough to lift the front end off the ground. Went to raise the loader and it started to work like normal. I shut it down now and i will try it a little later. It has been awhile since the last hydraulic fluid change. Could it just be fluid and a screen cleaning?