Go Bottom420 Loaders - do I have an internal hydraulic leak
 | seaborne@execpc.com
Join Date: Feb 2002 Posts: 2 
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2004-10-07 97864
I have a JD 4300 with very low hours (44). My 420 loader will not maintain a fixed height with or without a load. With my SCV control in the center postion, the loader arms and bucket drift slowly toward the ground.
Has anyone had problems with pre-mature internal leaks on their JD loaders hydraulics? Mine's out of warranty by time (purchased new Fall of 2000) but I wonder if complaining will produce any consideration from the factory?
Thanks
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 | lucerne
Join Date: Sep 2003 Posts: 192 Lucerne Maine
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2004-10-07 97867
I was offered,I think a JD 4300 from the dealer with low hours at what they said was a good price. I asked why it was returned and on sale. They said that the main bearing where the pto shaft goes through wasn't tight enough in the housing and it spun in the casing, tearing the inside of the casing up. The small pieces of metal got in the controll valves and while this guy was mowing his bucket kept dropping, thats why he brought it in. He got another machine. Don't mean to scare ya, it's probably something simple. ....
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2004-10-08 97915
All hydraulics, to some extent, leak down. Deere seems to have a looser standard for leak down... at least when compared to Kubota.
There has been a lot of stuff posted here on this subject.
The bottom line, according to Big Green, is if it takes at least an hour for your FEL to drift from full height to the ground, it falls with-in normal parameters.
If I remember right, the spec calls for no more than 12 inches of cylinder movement per hour. The info is, or was on the JD web site.
Some of us have found that switching from Low-Vis to a thicker hydraulic fluid helps, but does not totally eliminate the problem.
I noticed that I got almost zero drift on cold winter days compared to visible movement in the summer. That is what led me to experiment with higher viscosity fluids in the first place.
Switching to regular HyGard will help, if you can get past the dealer sales hype regarding Low-Vis.
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Link:
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| seaborne@execpc.com
Join Date: Feb 2002 Posts: 2
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2004-10-08 97928
Thanks for the tips.
After posting my question I did find the other threads on this issue. I don't feel drift is "normal". When I raise the FEL with or without a load it immediately start dropping about 6 to 8 inches within a minute.
This was a recent and sudden change from the FEL's normal operation. I haul mostly brush cuttings and wood and I usually leave the bucket at waste level for an hour of more while I loaded it without noticing any drift. After dropping a load on a brush pile the drift was so noticable I thought I had bumped the SCV control with my leg.
After reading the posts here, I assume I have bad seals on the loader arms rams. Do you have an idea what is a fair price to have both cylinders rebuilt?
Thanks again! ....
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