430 'chattering' when going up slope

   #1  

Richard

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Apr 6, 2000
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Knoxville, TN
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International 1066 Full sized JCB Loader/Backhoe and a John Deere 430 to mow with
I've got a field I cut (flat and smooth, much like a lawn) and next to it is a hill.

I cut these yesterday. On the flat part everything was normal. (takes me about 2 hours to cut all this)

By the time I got to the hill part, I got most of it done. I kept noticing however, that the forward/reverse lever was acting strange. It seemed as though it was adjusting itself down the scale.

Meaning... I normally (on the flat straight part) have the lever in full speed ahead. When I turn, or otherwise need, I back off to appropriate speed. Well, it was going "full speed" with the lever in the detent location as opposed to full up. I later noticed that my reverse was wonky. Ultimately to later find out I don't HAVE a reverse. Even in FULL reverse, the mower is still moving forward at a slow speed. When I have the lever over in the "start" mode, the transmission is going at a nice clip. If I have it in the "cruise" detent, it's going full speed.

The above is sort of cutting to the chase because before I figured this out....I was going up the hill, it slowed down and near stopped (it's never done this before and just this spring I gave it a new filter and new JD transmission fluid)

Anyway so I'm going up the hill and all the sudden it pretty much stops and the lever starts vibrating/chattering. I pulled it back to "stop" (hahahahaha since it still wanted to go) but the chattering stopped. Then after it calmed down, I could proceed. I have some flat spots that I cut adjacent to this slope and when I went on them, it worked fine (though the range of the lever seemed to have shifted down the column)

I'm a bit perplexed unless there is some attachment near transmission that can allow this to be adjusted relative to the transmission. That however, doesn't explain the chattering (made noise too)

I've never had this happen until yesterday.

Thoughts??
 
   #2  

beenthere

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Aug 16, 2001
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16,806
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Southern Wisconsin, USA
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JD_4x2_Gator, JD_4300, JD_X485, JD_425, JD_455, JD_110
Assume the fluid level shows "full". Did you verify that?

Which JD tranny fluid? low vis or regular vis ?
 
  
  • Thread Starter
#3  
OP
Richard

Richard

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Apr 6, 2000
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4,225
Location
Knoxville, TN
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International 1066 Full sized JCB Loader/Backhoe and a John Deere 430 to mow with
Attempted to.... but can't really tell. I wish they'd use colored oil....or dramatically colored instead of essentially clear!!

I'm not 100% sure which oil was used but I THINK it was their low viscosity. Since I was at the dealer, I didn't question any of it. Did a full transmission fluid change about a month ago and likely over-filled it.

Here's the thing (in my mind) If it was low on fluid, I would NOT expect low fluid to for example..... cause it to move forward when lever is in 100% full reverse. I would not expect it to move forward at 'normal to fast' ground speed when lever is in the starting detent.

Not knowing how the levers connect to the actual transmission, it's almost like something has slipped out of adjustment and now everything has shifted down a bit on the scale (reverse is slow forward, slow forward is normal ground speed, start detent is near full speed and "full speed" gains you nothing)

When on flat ground, there's no chattering yet. The chattering was when going up hill (which brought the idea of starvation to me) because when I stopped and sat.....then resumed (allowing the oil to settle down?) it then would go further.....but then chatter again.

I simply parked it because I've got a larger project I'm working on so went to park it.....BUT IT WOULDN'T STOP!!! Remember... "100% reverse is slow forward"..... so averted hitting my backhoe and got it parked sideways on the grass next to the driveway, wheels chocked so it won't roll and broadside the wife's car in a very slow motion wreck! (happened once but don't tell her) :oops:
 
   #4  

BravoXray

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Dec 17, 2019
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Nothern Indiana
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Kubota BX2230, John Deere 430 Diesel
It almost sounds like something has slipped or gotten loose in the linkage that goes from the F/R lever to the transmission.

1621565962358.png



This is the parts breakdown for the hydro linkage. It would appear to me the a possibility is that part #22 is a roll pin, and if that has broken or fallen out the arm, #23, it's going to slip on the swashplate shaft.
Also, in the breakdown for the later serial numbers, they changed to a shaft that was square on the end with a matching lever. Possibly this was a common point of failure.

Just something to check.
 
   #5  

Kish318420

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Dec 13, 2015
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274
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Mid-Michigan
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John Deere L & G 318 / 420 / 430
Just to let you know that there are 4 versions of the hydrostatic linkage assemblies over the life of production. So I would recommend getting familiar with the JD parts site, also document what you have.
 
   #6  

Deere Dude

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Feb 10, 2011
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Beaver Dam Wisconsin then to Hohenwald, TN
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John Deere 3720
I had a 420 that had a sheared roll pin in the linkage where it hooked to the transmission. It had just enough friction left where it would work sometimes but other times not.
lt worked when gently moved.
 
   #7  

BravoXray

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Dec 17, 2019
Messages
410
Location
Nothern Indiana
Tractor
Kubota BX2230, John Deere 430 Diesel
I had a 420 that had a sheared roll pin in the linkage where it hooked to the transmission. It had just enough friction left where it would work sometimes but other times not.
lt worked when gently moved.
The 60" deck on my 430 had a roll pin holding the pulley on the shaft on the bottom of the gearbox. It broke, and the pulley slid down the shaft, quickly destroying the belt, pulley and the shaft. It has a bolt in it now.
 
 
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