Backhoe spool valves stuck leaking - HELP : Back Hoe  -- Tractor Attachments Implements 3ph Discussion Forum and Review Backhoe spool valves stuck leaking - HELP : Back Hoe -- Tractor Attachments Implements 3ph Discussion Forum

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 05-05-2001, 15:34 Post: 27783
Norm



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 Backhoe spool valves stuck leaking - HELP

I went to attach my JD 7 backhoe to my 755 today. Everything started out fine, then as I was raising and leveling the backhoe, suddenly the hydraulics sounded like there was a valve stuck open and there was oil leaking out of the spool valve assembly. I stopped the engine and found one of the valves, the right stabilizer to be specific, was fully extended and when I pulled it back to center (requiring a bit of a push) more oil leaked out from the underside (side of the valve assembly opposite the levers). The engine was still off at this point. I would appreciate any input from you out there with more experience with hydraulics than I have. Is this caused by a failed relief valve? If so, how do I go about replacing it? Thanks.






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 05-05-2001, 19:06 Post: 27788
Roger L.



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 Backhoe spool valves stuck leaking - HELP

I don't know that particular set up, but maybe some general info will help. Off hand it doesn't sound like a failed relief valve. It just sounds like one or more of the O-ring seals in the spool valve gave way. This happens sometime for no reason at all. You can take the spool valve apart and replace them, although getting the O-ring+spool back into it's cylindrical housing is a difficult without hurting the O-ring. The trick is to compress the ring with some flexible shimstock and a hose clamp.....same type of tool as is sometimes used to get a piston and rings into a bore - if you don't use the finger and screwdriver trick.
Relief valves almost always fail "open" (low pressure all the time) rather than "closed" (hydraulic bomb!). They are designed that way. A relief valve that stuck in the closed position could be dangerous.
Keep in mind that I am just guessing. It could be lots of other things.






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 05-06-2001, 07:57 Post: 27797
TomG

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 Backhoe spool valves stuck leaking - HELP

It would be good to have some more information. Were the stabilizer extended and the control valve stuck before the hoe was mounted, or did it extend after the hoe was connected? Was the relief valve sound present during the entire time the tractor engine was running, and was the sound just 'suddenly noticed?' From the description, it seems like the hoe was connected with the stabilizer spool closed, but the 3ph was used during this time for 'raising and leveling.' I'm curious how the hoe is plumbed. My hoe connects ahead of the 3ph, so if any control valve is operated, the 3ph won't lift. If the relief valve sound wasn't present when the hoe was first connected, did it happen when the 3ph was used? Finally, was the amount of oil leaked consistent with a seeping fitting or more like something broken? In the situation, I think I'd verify that the hoe connections to the tractor hydraulics were correct. Input from a pressure line, and output to a return line. I'd also want to see if the stabilizer control valve operates freely without pressure to the hoe. If the amount of leaked oil seems like seepage from fittings, I'd tighten them and perhaps use some liquid hydraulic fitting sealant.






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 05-06-2001, 08:36 Post: 27799
Jim Reichard



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 Backhoe spool valves stuck leaking - HELP

Looking at the manual for the # 7 backhoe they show a cap on the bottom of the valve. Under this cap is the return spring and a "O" ring. I'm wondering if you lost or damaged this cap and lost your return spring and O ring. there is also a posibility that the spring retainer could have come loose in the cap that would cause it to jam and if you tried to move it .it would put pressure on the cap causing it to leak.

JIM






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 05-06-2001, 08:38 Post: 27800
Norm



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 Backhoe spool valves stuck leaking - HELP

Let me try to answer each of you questions. First of all, it is not a 3ph BH - it is a subframe. When I speak of raising and leveling, I am referring to lifting the entire unit up for mounting - hydraulics connected and using the stabilizers and boom to position the unit. There is no way to misconnect the hydraulics - one hose in, one out with opposite genders so they can't be confused. The sound was not present from the beginning of the mounting operation - it was working and sounding correctly as a began. After a couple of minutes the sound occurred and I noticed that the valve had been extended. The amount of oil leaking was *definitely* a 'something broken' and not just weeping. Once the pressure was stopped, and the valved returned to its normal position (as I said, taking a bit of force and squeezing more oil out the bottom) it then operated freely with no sign of hanging up. Having done this, the valves at that end of the gang make a sort of 'squishing' sound when you move them through their range.






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 05-06-2001, 08:44 Post: 27801
Norm



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 Backhoe spool valves stuck leaking - HELP

Jim - the caps are all still there - nothing visibly wrong at the valve gang. Once the oil pressure is relieved, there is no obvious problem with the way the valve moves through its range.






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 05-06-2001, 10:17 Post: 27810
Roger L.



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 Backhoe spool valves stuck leaking - HELP

I'm sticking with the internal O-ring theory. Either way, it sounds like it is time to take the offending spool valve apart and fix it. Or just replace it if the stabilizers use a separate and independent dual valve. If it is a portion of a 6-valve gang, a reasonable and cheaper alternative might be to block off the ports on the bad spool and add an outboard dual spool valve to work the stabilizers.






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 05-07-2001, 07:48 Post: 27836
TomG

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 Backhoe spool valves stuck leaking - HELP

Seem pretty clear now, and I'm sorry to agree. It's better when something can be straightened out without a repair bill. I might be tempted to try it again to see if the valve now works. Guess there's always the chance of something like a 'displaced' o-ring that might reseat. However, even if it did, I'd have little confidence in it and would keep wondering when it was going to fail again. I have a tough time living with equipment I don't trust.






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 05-07-2001, 08:40 Post: 27839
Norm



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 Backhoe spool valves stuck leaking - HELP

Thanks for all the help - any additional thoughts will also be most welcome. I will be pricing out the parts to replace the o-rings and seals today. It looks like I have to do alot of un-plumbing (is that a word??) as well as dealing with corrosion around the hose connections to the cylinders so I will price out a set of hoses as well since it is going to be all apart. It's an old unit I purchased used, so it just might be time for a full overhaul.






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 05-07-2001, 22:11 Post: 27868
Jim Reichard



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 Backhoe spool valves stuck leaking - HELP

If it intrests you I will be putting a # 7 backhoe parts manual and a technical manual on e bay this week. the parts manual is 185 pages and the tech is about 70 pages. I also have a 70 -70A loader parts book and a 790 parts manual.

THANKS
JIM






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