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Implement Alley Discussion Forum

Bale Wrapper Hydraulic Problem

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PaMike

05-18-2005 18:38:51




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I just bought a used 3 point bale wrapper off the local dealer. It is used, and I never used it before. It is the type with the rotating arm that pulls the plastic around. I test wrapped a dry bale, and it worked fine. I wrapped two high moisture bales and it worked fine, but the next day when I baled some more and I went to wrap them the arm would not rotate around the bale. The arm is tied to the hydraulics that run the two rolls that rotate the bale. Those rolls work properly, but for some reason the arm wont turn. When I drop the bale off, and cycle the thing dry, it works properly. Its like the hydraulic motor is stalling out. I am using an old roll of plastic that came with the machine and it seams like as I get down towards the end of the roll the plastic pulls off harder. The plastic seems ok, but maybe it takes that much to unroll it that it stalls the arm? Any ideas? I am really perplexed, and I have hay that needs baled and wrapped.

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kyhayman

05-18-2005 19:31:57




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 Re: Bale Wrapper Hydraulic Problem in reply to PaMike, 05-18-2005 18:38:51  
Sounds like

1. relief valve sticking
2. worn motor
3. worn pump

the order I would check



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PaMike

05-19-2005 09:33:02




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 Re: Bale Wrapper Hydraulic Problem in reply to kyhayman, 05-18-2005 19:31:57  
I think there may be a relief valve in the system in addition to the obvious tractor remote relief. When I was trying to get the arm to rotate the tractor remote made a whining noise, which I think is the pressure relief on the tractor. So if the relief on the tractor was popping off that should mean there is pressure at the motor. Do hydraulic motors just "go out"? I would assume if the motor was worn the fluid would go past the rotor so there wouldnt be a pressure build up. I will have to investigate. Thanks for your input.

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kyhayman

05-19-2005 17:24:28




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 Re: Bale Wrapper Hydraulic Problem in reply to PaMike, 05-19-2005 09:33:02  
Should be a system relief valve and also a regulating valve if it is a tractor powered system (wasnt thinking about those in my earlier response). May have a hydraulic accumulator too.

As far as failing, yes motors can suddenly fail or partially fail. All a hydraulic motor is, is a reverse operating type of pump. I just had a tractor pump fail, went from limited function to pump failure within 30 mins. One of the main enemies of these types of systems is mixing of antagonistic fluids. Can leave a gel like mass that will attack seals and foul valves and lines. My NH bale wagon has a self contained system using one type of oil and I added some tractor hydraulic fluid to it, formed a gellatinous semi solid in the lines and cylinders.

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PaMike

05-20-2005 09:29:01




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 Re: Bale Wrapper Hydraulic Problem in reply to kyhayman, 05-19-2005 17:24:28  
I talked to a dealer that sells the wrapper I have, and he told me what the problem probably is. They use an adjustable oriface to control the overall machine speed. When the machine is set to run at low speed there is a fairly large pressure drop across the oriface. So the relief on the tractor might pop off, but in reality the hydraulic motor isnt getting full pressure. The solution, obviously, is to adjust the oriface open so the motor gets full pressure. Its kind of a design flaw in my thinking because the bigger and heavier the bale is the slower I would want to go to make sure I dont damage anything, but in reality I have to go fast to get the full pressure....Looks like I need to dig out my old textbooks and redesign....

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