430 Hydraulic Question

foxd · Post by **foxd** » Sun May 19, 2013 5:28 pm

First of all I am hydraulic handicapped and need some advice. I just mounted a 62 blade on my 430 today. Everything works well when I raise the blade. However it will not hold and immediately begins to drop when I release the lever. I don't see any leaks. According to the parts book I have a "single remote control valve" with two pistons and one control lever. Does the control valve need rebuilt? Is it the pressure relief valves? Is there air in the lines? Any advice as to where I should start looking/checking would be appreciated. Thanks! Dave

Post by **Lavoy** » Sun May 19, 2013 5:43 pm

I would rebuild the cylinders first.
Lavoy

jtrichard · Post by **jtrichard** » Sun May 19, 2013 9:57 pm

ditto on cly.rebuild as the first step ....i doubt there is any thing wrong with valve if its not leaking

gregjo1948 · Post by **gregjo1948** » Mon May 20, 2013 5:02 am

Can the cylinders leak internally causing the blade to drop even if there is no external leakage? gregjo1948

DukeofDeere · Post by **DukeofDeere** » Mon May 20, 2013 6:14 am

Sure can leak internally.
If the bore is not scored bad new seals will fix the leak and blade drop.

Duke

whiteclipse16 · Post by **whiteclipse16** » Mon May 20, 2013 8:15 am

Not to hijack your thread, but I have a related hydraulic question.

When the dozer is running my blade will gradually drift down. If the dozer isn't running it will hold.
My control valve does leak slightly at the "piston" .
Do you think guys think it's the cylinders or the control valve?

Post by **Lavoy** » Mon May 20, 2013 8:44 am

That is an odd one, never encountered that. Running really should not effect it.
Lavoy

foxd · Post by **foxd** » Mon May 20, 2013 12:44 pm

Upon further investigation, I did notice some slight leakage around the top of one of the relief valves. Also, the relief valve that is leaking will move slightly up and down when I press on it. While the other relief valve, which is not leaking, appears to be tight. Could a leaky relief valve cause the cylinders to drop? Thanks for the replies!

Post by **Lavoy** » Mon May 20, 2013 4:00 pm

If it leaks enough oil, that might be possible.
Lavoy

foxd · Post by **foxd** » Mon May 20, 2013 4:59 pm

Update: I did a little more research tonight after work. The relief valve that was leaking seems to have slowed down. When I first tried it, the casting around the valve was always full of oil. I kept wiping it up, and it kept coming back. However now it appears to have slowed down, maybe even stopped. I ran the blade up and down several times. It will hold in the down position with the front of crawler lifted off the ground. However it still drifts down when raised. I did notice that since I have run the blade up and down several times both front seals are in fact leaking.

Lavoy, Do you have cylinder rebuild kits for JD62 cylinders? Or do you have the seal specs that I could take to the local hydraulic shop, or should I just go through Deere and buy the kit?

Thanks - Dave

Post by **JD40c** » Mon May 20, 2013 11:31 pm

Someone ages ago put in new o-rings in the cylinders on my old #76 blade. The blade would drop on it's own quickly. Turns out the o-rings were way to small and didn't actually stick out past the piston surface. Installed modern cylinder seals and it would keep the blade up indefinitely.

Post by **Lavoy** » Tue May 21, 2013 7:58 am

I think I only have one kit on hand, am short one seal for a second, but small matter to get that.
Lavoy

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