4WD JD 950 help

JWSpringfield · Apr 29, 2018

I have a JD 950 4WD tractor. Currently with the 4WD engaged the front wheels drive but the rear wheels do not. With the 4WD disengaged the rear wheels do not work. Does anyone know what tends to break that would cause this type of malfunction? I want to try and target my disassembly if possible. Thanks.

tim s · Apr 29, 2018

What will it do in 2 wheel drive and the differential lock engaged??

JWSpringfield · Apr 29, 2018

I will try this again when the rain lets up a little. From what I remember when the issue happened locking/unlocking the diffferential made no difference.

tim s · Apr 29, 2018

This will kinda prove if the differential failed or not..

JWSpringfield · Apr 29, 2018

Got a little wet but it was worth it. The rear wheels do rotate with the differential engaged.

JWSpringfield · Apr 29, 2018

What does it mean if the rear wheels work with the differential engaged and dont without it

tim s · Apr 29, 2018

That means your differential is the issue,,center pin or gear failure,,or possibly a broken Axel,,when it don't move with the diff out it means the power is going to the side that has failed, when you lock the diff. the power is shared to both sides. I don't know the weak spots on those little tractors to be sure which part of the diff is failed,,but for sure it is in that area,,

JWSpringfield · Apr 29, 2018

(quoted from post at 12:45:27 04/29/18) That means your differential is the issue,,center pin or gear failure,,or possibly a broken Axel,,when it don't move with the diff out it means the power is going to the side that has failed, when you lock the diff. the power is shared to both sides. I don't know the weak spots on those little tractors to be sure which part of the diff is failed,,but for sure it is in that area,,

Thank you for all the help. Now I can take the tractor apart smart.

Best regards,

John

tim s · Apr 29, 2018

Before you start jack up the rear end and with the diff locked and in gear, see if one axle turns free start looking at that axle first.

JWSpringfield · Apr 30, 2018

(quoted from post at 15:56:06 04/29/18) Before you start jack up the rear end and with the diff locked and in gear, see if one axle turns free start looking at that axle first.

Thanks for the tip. I jacked it up and the left side turns. I will start on that side. Thanks again.

buickanddeere · Apr 30, 2018

There is a free parts book on the JD web site which will illustrate some of the hidden bits and pieces .

JWSpringfield · Jul 18, 2018

I noticed as I started taking things apart that the wheel stops turning when I apply the brake on the non-functional side. Does that mean pinion problem? I’m assuming everything between the brake and the wheel is still ok.

Is my logic ok?

Thanks for helping.

John

JWSpringfield · Oct 24, 2020

Finally had enough time and ambition to break this apart. The final drive pinion shaft was broken at the transition from the splines in the deferential and the final drive gear. Found a used one that is in good shape to install. Any tips for installing this part?

buickanddeere · Oct 24, 2020

(quoted from post at 12:32:56 10/24/20)
Finally had enough time and ambition to break this apart. The final drive pinion shaft was broken at the transition from the splines in the deferential and the final drive gear. Found a used one that is in good shape to install. Any tips for installing this part?

Generally it is better to install a used pair of matching gears , but it will probably be ok if the clearances are properly set.

4WD JD 950 help

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