4440 rear axle

Kory1998 · Jan 2, 2019

Did the John Deere 4440 ever have an issue with the rear axle drive bearing going out. I have heard of the 30 series going bad. Mine is a 1980 year model it has the bigger rear axle shaft 92 mm diameter. When I bought the tractor they had used it to pull a shredder with rice and cane tires to shred row crop no duals were on it. Local one owner tractor.

Bob · Jan 2, 2019

I have no personal experience with outer axle bearing failure in those tractors, but the official parts catalog DOES show an "undersize" bearing, even for the 92 MM axles. (When the outer bearing turns on the axle, they can be ground to an "undersize, IF the wear doesn't exceed a certain amount using a crankshaft grinder.)

tim s · Jan 2, 2019

They are really no different there than the 30's,,one of the primary reasons for axle bearing failures is the space between the axle flange and the bearing start to wear letting the pre-load go away from the bearings, eventually the bolt backs out and will let the axle work out, and with no pre-load on the outer bearing it will fail.

JD Seller · Jan 2, 2019

The biggest trouble with any of the outer axle bearings on that era of JD tractors is the outer bearing has to be greased. Should use a special grease for it too. Most never get greased or the wrong grease is used.

4520BW · Jan 2, 2019

I have repaired alot of them that were over greased and pushed seal out. Net wrap is another one.

machineman · Jan 2, 2019

While working in a automotive machine shop back in those days I ground a lot of those axels for the local JD dealer.

SVcummins · Jan 2, 2019

What grease should you use ? I usually use John Deere full synthetic grease but I have only started greasing in the last 15 years after I got the operators manual and found out there should be grease zerks put in place of the pipe plugs and greased annually

JD Seller · Jan 2, 2019

The grease your supposed to use is "John Deere Multi-Purpose SD Polyurea Grease TY6341" . JD says this is for the out board axle bearing and all of the MFWD U-joints.

I do know I switched to this grease in my front axle u-joint on my pickup and I have doubled the life of them. Use it in the u-joints of the semi and have not had a u-joint failure in several years.

I also use it any bearing applications I have. Like the grain augers, fertilizer augers. A good friend uses it on his fertilizer carts. He says it is rare now for the bearing to go out on them.

This grease has water and rust inhibitors in it. It also runs before it burns. So in bearings with a little heat and it will flow towards the hot spot.

In is NOT for sliding stuff or even pivot pins. It is not sticky enough to stay in place on them.

SVcummins · Jan 3, 2019

I would think anywhere that grease will work the full
synthetic would work better as it has higher
temperature rating and load rating

JD Seller · Jan 3, 2019

The important thing on the grease for bearings is how the grease acts when warm/hot. A lot of grease has high ratings and is very sticky. So if you put it on a steel plate and heat the plate it will burn real soon after it flows not much of the temperature window. This grease flows at a much lower temperature than it burns.

4440 rear axle

Kory1998

Member

Bob

Well-known Member

tim s

Well-known Member

JD Seller

Well-known Member

4520BW

Well-known Member

machineman

New User

SVcummins

Well-known Member

JD Seller

Well-known Member

SVcummins

Well-known Member

JD Seller

Well-known Member

Similar threads