Loader arm ram problems: Loaders  -- Tractor Attachments Implements 3ph Discussion Forum and Review Loader arm ram problems: Loaders -- Tractor Attachments Implements 3ph Discussion Forum

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 03-20-2004, 14:36 Post: 80488
Cutnfill



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 Loader arm ram problems

I am having a problem with my 80 series loader on my John Deere 850 loader. The loader rams will only raise so far then they stop about headlight height. If you continue to hold the lever they will raise slowly to full height. They lower just fine, sometimes they raise back to original height and sometimes back to the headlight height again. The bucket rams work fine and will lift the front end of the tractor off the ground. The 3 point is working fine. There were no leaks or indication of any problem, it started this morning when I fired up the tractor. Looking for a little input






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 03-20-2004, 15:32 Post: 80492
loghouse95



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 Loader arm ram problems

Is it making any noise??? You probably already did this but have you checked your fluid level






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 03-20-2004, 15:57 Post: 80496
hardwood

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 Loader arm ram problems

What has your outdoor temprature been there. I have known of the fluid to carry enough free water with it after spring warmup to clog the super fine metal pump intake screen. If you've changed your fluid and filters lately then that likely isn't the problem, but it does sound like something is starving your pump after a certian time interval of operation. Likely the 3pt. ram doesn't require near as much fluid as the loader rams, so it would raise the 3pt. before iceing or watering over of the screen would occur. lots of other possibilitys here like a partly stuck relief valve, an air leak into the line on the suction side of the pump? Just thought I'd throw out some things I've saw happen. Best of luck, Frank.






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 03-20-2004, 16:28 Post: 80504
Cutnfill



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 Loader arm ram problems

Thank for responding guys. Fluid levels are fine and I have changed oil and filter less than 30 hours ago. Only noise is typical end of travel noise when arms reach free travel height. I have used the tractor all through the winter. There still could be some water in there somehow. I was leaning toward the relief valve.






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 03-20-2004, 18:38 Post: 80512
loghouse95



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 Loader arm ram problems

are you using a joy stick control.... the spring in the detent might be sticking






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 03-20-2004, 18:53 Post: 80514
Cutnfill



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 Loader arm ram problems

Nope, two lever






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 03-21-2004, 05:51 Post: 80547
TomG

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 Loader arm ram problems

I wonder if the bucket has a fairly heavy load? I was thinking about it only rising to head-light height and that position would be nearly horizontal and would be the point of max load on the system. Marginal seals, control valves or the relief valve could be letting go at that point. I also wonder if the bucket leaks down quickly if it's left raised.

The fact that the bucket circuit works normally and I imagine the 3ph as well, suggests the pump and system relief are OK. One thing you might do if the cylinder hoses are connected by quick-connects is swap the bucket and lift hoses. If the problem moves then it's likely the valve. To disconnect hose or any fittings, the tractor should be off, everything on the ground and the pressures relieved. There is some other safety stuff to observe.

The cylinder seals could be tested when the hoses are off. The lift hose could be connected and the bucket locked down. Then, the lower hose quick-connect could be opened or removed. Operating the lift would place full system pressure on the cylinder. If it leaks oil will come out of the lower hose.






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 03-21-2004, 07:08 Post: 80553
Cutnfill



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 Loader arm ram problems

Tom, the problem occurs with no load at all in bucket. The arms did creep down a little with a full load in the bucket when at low idle. I was going to check the screen on the pump just for the heck of it. This was a used unit that I picked up and even though I changed the hydro oil and filter maybe a look to see how clean it is wouldn't hurt. I did have the bucket controls redone about 30 working hours ago because of a broken seal. The unit has 1600 hrs on it so the seals in the rams could also need replacing. The funny thing is this unit is the tightest non leaking tractor I have ever owned. Only an ocasional spot of oil on the floor or anywhere.






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 03-21-2004, 08:22 Post: 80561
harvey



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 Loader arm ram problems

I'm gonna stretch a little here. Have you looked for a bend cylinder rod/s? Raise it all the way up and look really hard at both of them.






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 03-21-2004, 08:38 Post: 80564
TomG

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 Loader arm ram problems

Sounds like it might take a bit of time to get all the pieces of the puzzle together and figure it out. I wonder if the lift has normal power and speed up to the point where it craps out? I'm thinking the solution may come from reasoning why it craps out almost always at the same point and why it happens with and without a load in the bucket.

I think I'd verify that the arms aren't binding above the headlight level or a hose isn't getting pinched. If so a relief should be opening and a squeal could be heard. Failed reliefs don't always squeal since little it takes high pressures. The trouble with explanations like intermittent reliefs, obstructions, failed quick connectors, fluid and suction side explanations is that the problem isn't likely be at the same place or at widely different loads. I'm making an assumption that the lift cylinders are conventional because there are some specialty features such as pilot operated checks that could do it. I'll stop now before my thinking get any more obscure.






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Discussion Boards > Active Subjects > Messages as Posted > Loaders Forum

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