Re: 4320 vs 4020

Posted by Gerald J. on January 03, 2007 at 11:37:51 from (67.0.102.247):

In Reply to: 4320 vs 4020 posted by Raleigh Boulware on January 03, 2007 at 11:03:50:

The 4320 is basically a 4020 with a turbo. No intercooler, that was the 4620. My new generations book says it used slightly bigger gears in parts of the transmission by not having reverse gear synchronized. I'd guess the axle diameters may be bigger. The engine is the same displacement, but probably made stronger and probably has better piston cooling, like oil jets spraying on the undersides of each piston.

I have experienced the loss of hydraulics with the clutch pushed on my 4020. There is a Service Information about it on my web page linked below. In those its due to loss of a check valve deep in the transmission and the cure is converting an elbow to a check valve where its easy to get at. In later 4020, there was a check valve in a T at the hydraulic oil reservoir up front according to a service bulletin I have. I don't know if that covered 4320, since I've not had any interest in the 4320. One other service bulletin of that era suggests there might be a leak from the high pressure circuit to cause that rapid loss of hydraulic with the clutch pushed. I know on another forum last week that someone found a bad O-ring in some assembly in the transmission case that was the cause of his pressure leak in a late 4020. That was harder to find and to get to than adding the check valve to the elbow which would not have fixed his problem.

With the SI number from my web page you should be able to get a print out of it (just text, no pictures) from a JD parts computer to see if it covers that vintage of 4320. A really good old time JD shop supervisor might remember service informations or bulletins on the problem in the 4320.

Gerald J.

• Fixing 4020 hydraulics

Replies:

• Re: 4320 vs 4020 Reaver 15:48:29 01/03/07 (2)
  • Re: 4320 vs 4020 low budget 04:32:42 01/04/07 (0)
  • Re: 4320 vs 4020 Gerald J. 19:31:23 01/03/07 (0)

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