Go Bottom48 hoe Bleed down a problem
 | Petrops
Join Date: Jul 2003 Posts: 33 Massachusetts 
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2002-11-24 45339
I am looking at a 4600 with a 48 hoe. There are about 300 hrs on the tractor and about 100 hrs on the hoe. The owner tells me that if he leaves the hoe up about 4 ft off the ground that it will have bled down to the ground in about a 3 hours period. He has a similar experience with the stabilizers. He indicates taht this has been the case since he bought it new and that it is very slowly getting worse. He says there is no such problem with the FEL.
My question is: Is this a fatal flaw and if now what could be that cause and remedy?
Thanks
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2002-11-25 45350
All cylinders and valves leak down to some extent, and it's usually not a problem unless it interferes with operation. I believe JD publishes specs for acceptable levels of leak down and the hoe probably is repairable under warranty if the leak down exceeds specs. ....
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2002-11-25 45358
I have not seen Deere's leak down specs for backhoes but I have seen the specs for FEL's. It may surprise you how much leakage they consider acceptable. The info is on the Deere web site. ....
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| PeterH
Join Date: Jul 2003 Posts: 9 Dallas Texas
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2002-11-26 45430
I have a 4300 with a 48 hoe and see the same behavior with my rig. I've taken to using a cargo strap to keep the stabilizers up when the tractor is in the shed. Lately I've noticed that the FEL won't hold a load when the bucket is elevated above 6 feet or so. By the sounds of this thread, I shouldn't be too concerned with this unless it gets much worse suddenly. If that isn't right, please say so! ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2002-11-27 45438
Not a problem--at least I don't associate the type of leak down described as an early warning symptom of failure.
Awhile back somebody mentioned that his leak down was bad enough that he had to remember to raise the loader during trips between work sites or it would start dragging. That would be cause for me to fix it.
It takes a few hours for the boom on my hoe to leak down till it's held by it's latch but that's not much leak down or much of a problem. The stabilizers don't leak down at all but they also won't hold up tractor rear end for long. I don't try to take the rear tires completely off the ground and it's an aggravation that I have to lower the stabilizers frequently. It didn't used to do that but I'm also probably digging the tractor in better now so there's more load on the stabilizers. That one probably is aggravating enough for me to want to fix it.
It's a fairly small hoe for the tractor so the problem may be that the load on the stabilizers is enough to open a pressure relief valve in the hoe valve assembly and that might be adjustable. The problem also might be oil getting past the cylinder piston seals or the control valves. However, the stabilizer left and right cylinders and control valves are independent parts. So the same failure would have to happen on both sides, which seems unlikely. That's why I'm inclined to think of a relief valve or maybe it's just because that problem would be less work to fix.
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