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Tractor Talk Discussion Forum

priming the hydrostatic pump that operates the mo

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Don Williams

10-29-2004 07:16:06




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I have a john deer 855 small four wheel drive utility tractor.It blew a seal on the out side front of the pump, which I replaced and I replaced the oil filter on the hydroststic transmission. I filled the transmission to the full mark on the dip stick of the transmission. I started the tractor and the 3 pt. lift worked fine. It took maybe 3to 5 minutes to get the hydralic steering to work, but it works good now. My problem is I can't get the forward and reverse pedels to move the tractor. Can any body help. Thanks Don Williams.

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JT

10-29-2004 09:42:03




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 Re: priming the hydrostatic pump that operates th in reply to Don Williams, 10-29-2004 07:16:06  
One way is to lift the rear of the tractor and then see if the tires will move. If they move, let them run for a while--5-10 min, perhaps, this will let some of the air bleed off. If this does not help, then you will need to do some pressure tests to make sure that you have pump pressure to move tractor.



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Mike (WA)

10-29-2004 09:03:31




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 Re: priming the hydrostatic pump that operates th in reply to Don Williams, 10-29-2004 07:16:06  
Boy, you gotta lotta nerve- posting a legitimate tractor question when we could be arguing about serious world problems. . . :>)



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txblu

10-29-2004 09:30:01




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 Re: priming the hydrostatic pump that operates th in reply to Mike (WA), 10-29-2004 09:03:31  
Some people are to be admired. They have True Grit. Grin

Mark



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txblu

10-29-2004 08:39:00




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 Re: priming the hydrostatic pump that operates th in reply to Don Williams, 10-29-2004 07:16:06  
You didn't happen to accidentally pull out on the disconnect rod did you.....you know the rod that disconnects the tranny from the engine so you can move it with the engine off.....or is that another type tractor. Not familiar with your model.

Otherwise, probably air trapped somewhere. Gotta figure out how and where to bleed it off. If the other stuff works, sounds like your pump is a pumpin.

Mark

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buickanddeere

10-29-2004 09:19:06




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 Re: priming the hydrostatic pump that operates th in reply to txblu, 10-29-2004 08:39:00  
I think those use a variable displacement swashplate pump and swashplate motor in the trasmission to drive the wheels. It's separate from the high pressure hydraulic pump that operates the loader etc. Is there a low pressure transmission charge pump that that primes the transmission and hydraulic pump? Where is this pump and seal? Was the filter the correct type?



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