430 Hydraulic Question
430 Hydraulic Question
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
'39 B, '48 B, '49 A, '50 B, '54 40U, '55 40U, '59 430U, '60 430C
I would rebuild the cylinders first.
Lavoy
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com
Owner and moderator www.jdcrawlers.com
- gregjo1948
- 350 crawler
- Posts: 1000
- Joined: Mon Aug 30, 2010 5:58 am
- Location: Newark Valley,NY,USA
430 hydraulic question
Can the cylinders leak internally causing the blade to drop even if there is no external leakage? gregjo1948
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford
- DukeofDeere
- 1010 crawler
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- Joined: Wed Oct 26, 2011 7:12 am
- Location: Hudsonville Michigan
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- 2010 crawler
- Posts: 622
- Joined: Tue Mar 30, 2010 8:02 am
- Location: Steubenville, OH
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?
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?
Ben
Great Grandpa's 1960 440ICD 602 blade
Between SN's: 455,633 - 456,801
Currently Rebuilding/Restoring
Great Grandpa's 1960 440ICD 602 blade
Between SN's: 455,633 - 456,801
Currently Rebuilding/Restoring
That is an odd one, never encountered that. Running really should not effect it.
Lavoy
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com
Owner and moderator www.jdcrawlers.com
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!
'39 B, '48 B, '49 A, '50 B, '54 40U, '55 40U, '59 430U, '60 430C
If it leaks enough oil, that might be possible.
Lavoy
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com
Owner and moderator www.jdcrawlers.com
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
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
'39 B, '48 B, '49 A, '50 B, '54 40U, '55 40U, '59 430U, '60 430C
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.
1955 John Deere 40C 4-roller
I think I only have one kit on hand, am short one seal for a second, but small matter to get that.
Lavoy
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com
Owner and moderator www.jdcrawlers.com
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