Re: 4320 vs 4020

Posted by Gerald J. on January 03, 2007 at 19:31:23 from (67.0.97.159):

In Reply to: Re: 4320 vs 4020 posted by Reaver on January 03, 2007 at 15:48:29:

I don't know. My notes don't say 4320 or 4620. A good JD shop man should know. Or look for that Service Information number from my web page and see if it covers your tractor. I also referenced some service bulletins of the era on my web page.

The fundamental problem is that the oil cooler and a reservoir up front hold more than a couple gallons of oil. If the check valve in the early 4020 in the transmission or near the reservoir of the late 4020 leaks the front pump runs out of oil quickly. That's the function of making the elbow into a check valve to replace one that's hard to get to in the depths of the tranmission. But if there's a high pressure leak bypassing oil from the output of the main pump it will use up that reserve fast too. I know putting the check valve in the elbow on my '68 4020 did fix the loss of hydraulic with the clutch pushed in. More than once I've let it set for months, pushed in the clutch, started it, and raised the loader before letting the clutch out. Working in a basement hole, I'd seat the loader bucket in the dirt on th side, and push in the clutch shift gears while I was turning the steering and rocking the bucket to break the bite loose and beginning to lift before letting the clutch out in reverse to back away. Busier than a one armed paper hanger, but the hydraulics kept up.

Gerald J.

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