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430 John Deere hydrostatic transmission operation?

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KSGuy

05-28-2003 09:17:06




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I have had a 430 John Deere for years and have hated the hydrostatic transmission it has. Searching the archives I don't find anyone else complaining about it so thought I'd ask a question about how it operates. It seems that it always takes two hands to operate this thing. If you set the control at a medium to slow speed, it does fine on flat ground. Head up a small incline or let a wheel go into a depression and it goes to between half speed and stop so you have to move the lever forward to go again. Hit the top of the incline to flat ground and off it goes at 2 or 3 times the ground speed. If you make a turn figure it'll again double or triple ground speed for a short period of time until it settles down again. So I wear out my right arm moving the transmission ground speed lever back and forth all the time. I drain the fluid each year and replace with type F fluid as well as change the filter. I always keep the fluid level in the site glass at the rear. Hydraulics and steering always work as I would expect them to. Is this normal for this tractor or have I been running around with a broken transmission all these years? The local John Deere dealership has changed hands several times over the years and the high school kid working part time as the mechanic doesn't know what to do with it.

Thanks in advance for any input.

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John - NY

05-30-2003 18:17:05




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 Re: 430 John Deere hydrostatic transmission operat in reply to KSGuy, 05-28-2003 09:17:06  
My John Deere 330 did the same thing. I changed the oil and filter, checked the linkage, etc. It didn't help. It ended up being a worn out hydrostatic transmission (Peerless). It cost $1500 for the transmission from Deere. I put it in and all the problems were solved. Runs like new again! The diesel engine is still going strong at 2400 hours, but the tranny needed replacing at about 2200. I checked on having it rebuilt, but they said that it wasn't worth monkeying with the aluminum transmission because of the wear they develop. Hope that helps!

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kjm

05-28-2003 20:22:49




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 Re: 430 John Deere hydrostatic transmission operat in reply to KSGuy, 05-28-2003 09:17:06  
KS. Mine does the same thing,I just put it in low range and mowe wide open. HA HA. My old AC mowers did the same,but the newer stuff dosn`t have these problems(JD455, AgCo Alis 2025 ect.)



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Dave

05-28-2003 11:30:17




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 Re: 430 John Deere hydrostatic transmission operat in reply to KSGuy, 05-28-2003 09:17:06  
KSGuy - The 316, 318, and 420 have a similar problem that pops up from time to time. It's not the hydrostatic transmission, but the hydraulic control linkage that is the culprit.

There is a tension adjustment that will keep the control lever where you want it to be, and this is explained in the technical service manual. I'm surprised the JD Dealer is of no help, since it's such a simple five minute job to fix (on the 318 anyway).

I do not have a tech manual for your model tractor, so I can't give you the specifics on how to correct the adjustment. On the 318s there were three different setups, and each one is adjusted differently. Maybe if the JD Dealer has a tech manual, he'd let you look at it or make copies of the pages involved. = Dave

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JDOUG

05-28-2003 15:54:06




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 Re: Re: 430 John Deere hydrostatic transmission op in reply to Dave, 05-28-2003 11:30:17  
Be sure to check for any play in the linkage all the way from the lever to the swashplate arm on the hydro. The control arm on the hydro is held on with a roll pin. I have seen the roll pin wear and cause alot of lost motion between the arm and the shaft. Another place to check real close the where the linkage attaches to the arm on the hydro. Depending on the year of your tractor, there may be a small bushing there that will wear and cause alot of play. What your describing sounds like wear in the hydro linkages like the above reply says.

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