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Tractor Talk Discussion Forum

Jerky loader

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DL in MI

12-24-2006 20:53:12




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Bought a MF 165 Diesel with a Freeman loader, the aux. hydraulic pump was bad, loader was not working at all when I purchased it. Picked up a new Eaton pump to replace the broken Borg-Warner, the dump seems to work fine but when I attempt to lower the bucket it acts as if one side is hanging up, it doesn't come down even. I've read that you don't have to bleed these things so what's up? Also the fluid was down to where it didn't show on the dipstick, so I added until I had fluid above the magnetic portion of the stick which is maybe 3 inches up the stick from the bottom and I noticed the fluid looked "milky" suggesting water in the fluid. The loader also would drop a little on its own like it was seeking its own level, I saw no leaks anywhere. Any advise would be appreciated, thanks.

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SPOOK

12-25-2006 14:57:56




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 Re: Jerky loader in reply to DL in MI, 12-24-2006 20:53:12  
Just saw your note on cyl. My boss heard a pop on his loader then had trouble. Told him to ck cyls as nothing visual was broken. Said their was nut on end of shaft and to check. One cyl the shaft pulled right out with threads stripped. Could be cause of prob. same jerky reaction with the disconnected piston on one cyl. Also this will make the oil blow thru the seal and airiate, looking milky. Try it

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ihfan

12-25-2006 10:37:00




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 Re: Jerky loader in reply to DL in MI, 12-24-2006 20:53:12  
If you have changed hoses, make sure they are correct, loaders do funny things with crossed hoses. Don't ask how I know!



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DL in MI

12-25-2006 06:15:24




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 Re: Jerky loader in reply to DL in MI, 12-24-2006 20:53:12  
Thanks for the reply. I wish I knew what model it is, the only info I can find is a tag on the bucket with a serial # 748963, it does say Bushhog Freeman so it was made after bushhog acquired freeman, and a metal tag on the top of the left arm with the numbers 743847. I would like to ID the model for future reference. I'll check for the plate below the reservoir, and I admit I didn't raise the loader all the way due to the herky-jerky of the down stroke, but I'll give it a try. Also if a cylinder seal was leaking enough to allow it to drop wouldn't there be evidence of fluid on the cylinder or can they leak internally? Thanks again & Merry Christmas. Oh buy the way Temp. was in upper 40's low 50's.

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Jerry/MT

12-25-2006 20:01:47




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 Re: Jerky loader in reply to DL in MI, 12-25-2006 06:15:24  
When I mentioned leaking seals I meant the seals on the piston which is internal leakage. If the external seals were leaking it would be obvious to you. Those temps should not present a problem with the fluid based on my experience.



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Gerald J.

12-25-2006 07:44:16




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 Re: Jerky loader in reply to DL in MI, 12-25-2006 06:15:24  
When the cylinder lowers under load, it can be the piston seals or the valve. There are two seals on a double acting cylinder, the piston and the piston rod. The piston rod seal only has pressure on when you force the cylinder to retract so it doesn't leak as often. But it can leak. Well used cylinders often have the piston seals worn out, things like an O-ring worn to a D cross section. Its a lot more trouble to get the cylinder apart and back together than to change the seal. That seal may have an O-ring plus a couple backing rings.

There is a chance that Baum Hydraulics (www.baumhydraulics.com) may have a kit, or the parts. If you decide to do the cylinder yourself you may have to take it part to identify the needed parts, then order them. There are several ways to take a cylinder apart, depends on who made it. I take mine to a machine shop that has a big press with V-blocks to hold the cylinder and a 4' pipe wrench to turn the ends where that is how they come apart. Tools that I don't own. And I happily pay the $25 for the repair. Randall Machine and Welding in Randall, Iowa. Only open some Friday afternoons and Saturdays for now.

Gerald J.

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alg

12-24-2006 23:48:58




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 Re: Jerky loader in reply to DL in MI, 12-24-2006 20:53:12  
Do you know what model freeman loader it is.?I would change the fluid and keep working it,might be acting up from lack of use.On the 4000 model there is a suction strainer inside the loader frame on the bottom right side.Access plate on bottom.



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Jerry/MT

12-24-2006 21:26:12




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 Re: Jerky loader in reply to DL in MI, 12-24-2006 20:53:12  
Are you sure the cylinder rod isn't damaged(bent)? The milky color is indicative of water in the fluid. How cold is it where you are at? Hydraulics can be jerky when cold but that goes away when the fluid is warmed up. The loader dropping on it's own could be leakage in the control valve or worn seals in the cylinder or both. While you don't have to bleed the hydraiulics, you get the trapped air out by extending the cylinders and retracting them. the air comes out in the fluid and is released into the reservoir by the return flow.

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