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Discussion Starter · #1 ·
Hi All,

New to the forum and could use some help with my JD 990 4WD. When I shift into 4 WD it will engage and move in 4 Wheel but there is a clunking noise. Two wheel drive works fine. I visually inspected and see no problems. I am attempting to examine the front drive shaft but am not sure how to remove it. I have the shields back and have removed the bolts holding the shaft to the front differential. No mention of removal in my technical manual. Here's a picture. Any ideas welcomed.
 

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Discussion Starter · #3 ·
I removed the bolts-sorry to throw you for a loop! I'm looking at the parts diagram as we speak. I am trying to figure out how to get the clearance needed to pull the drive shaft out of the front differential. I've had the tractor about 11 years.
 

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Discussion Starter · #7 ·
I looked at the parts diagram but it doesn't really show you how to remove the shaft. (and it doesn't simply slide back). I am trying to slide the shaft back on the splines but it won't budge. It seems like the spring loaded mechanism should slide back and I believe there are ball bearings inside. I am wondering if maybe the ball bearings are worn and won't let it slide.

I have an operators manual which is the simple maintenance stuff and have a technical manual which gives detailed information about almost everything else including engine overhaul and transmission repair. But one scant paragraph about the front drive axle and it is a very general overview with nothing about the disassembly/reassembly process. Wonder what they use at John Deere to work on them??
 

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Discussion Starter · #9 ·
Found out that the rear end of the
Sometimes when I crack open these tech manuals I cant find much detail I end up stumbling upon what I needed in some other portion of the manual that didn't seem like the most intuitive place for it to be located. Are you looking at a paper manual? I believe the e-versions have search functions that could ease the shake out a bit.
You are correct. I am looking at a paper manual. Thanks for the tip on the e-versions.
 

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Discussion Starter · #10 ·
So, with some advice from another site, I jacked up the front end of the tractor and it took the pressure off of the shaft, which then easily slid out. Of course, out rolled the 6 ball bearings from each end of the shaft but I found them easily. It looks like the rear end of the shaft coupler had excessive wear, causing the coupler to "hop" over the ball bearings under load which made the clunking sound. I'll post some pictures in a minute. Interestingly, the ball bearings in the front coupler are bigger than those in the rear (wear?)
 
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