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Able to pull the shaft out after taking the weight off the front tires. Out popped the ball bearings at each end also but found them easily. The problem appears to be the rear coupler is worn, causing it to "hop" over the ball bearings which make the clunking sound. I will attempt to fix that...

Here is a picture of the frond drive shaft where it enters the differential.

My John Deere 990 4 WD makes a clunking sound when placed in 4WD. I visually inspected and see no obvious problem. The shift lever to engage the 4wd operates ok-no bind. I am attempting to remove the front drive shaft to inspect where it goes into the front differential. My technical manual...

Tested the injector as you suggested and it functioned properly. I then went through each fuel hose and connection. There were 2 hoses with small cracks in the back where I could not easily see them. I also had one nut on the top of the pump that was not completely tight. Once hoses replaced...

Thanks for the suggestions. I loosened the line to the top of the injector of the non-firing cylinder and while there is fuel there, I don’t know if it is enough volume or pressure . I replaced the injector for that cylinder but it still didn’t fire. I did not yet try testing to see if the...

John Deere 990 ran out of diesel fuel. Coasted off a bank and tried to restart. Cranked briefly then refilled with fuel. Started but had to bleed. Ran rough and discovered 1st cylinder closest to dash is not firing. All other cylinders are firing good. Removed and cleaned injector for that...