John Deere 990 4 wheel drive problem

   / John Deere 990 4 wheel drive problem #1  

Markbasinger

New member
Joined
Sep 9, 2022
Messages
6
Tractor
John Deere 990
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 gives no instructions on this. I removed the bolts securing the drive shaft to the differential but it will not completely pull out. Any suggestions regarding removal?
 
   / John Deere 990 4 wheel drive problem
  • Thread Starter
#2  
Here is a picture of the frond drive shaft where it enters the differential.
 

Attachments

  • john Deere.jpg
    john Deere.jpg
    2.8 MB · Views: 135
   / John Deere 990 4 wheel drive problem
  • Thread Starter
#3  
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 and be back on the road.
 
   / John Deere 990 4 wheel drive problem #4  
Good you found the cause. Keep us posted on the repair.
 

Tractor & Equipment Auctions

Kenco PH9000 Self-Leveling Pipe Hook - 9,000 LB Capacity, 8FT Max Pipe Length (A51039)
Kenco PH9000...
2012 Ram 1500 4x4 Crew Cab Pickup Truck (A49461)
2012 Ram 1500 4x4...
2011 L3 MEP-806B GENERATOR (A51222)
2011 L3 MEP-806B...
2016 PETERBILT 587 (A50854)
2016 PETERBILT 587...
2005 LUFKIN 48X102 SPREAD AXLE FLATBED (A50854)
2005 LUFKIN 48X102...
2017 DITCH WITCH RT30 (A51243)
2017 DITCH WITCH...
 
Top