MF 390 judders on the road

[J.D]

I have recently bought a 390 and on the road in top gear it seams to judder every so often as if it’s stuck in 4wd any ideas would be greatly received as I don’t want to damage it.

 

[cousinjack]

Check switch under handbrake ... if it's not working or not fully being depressed, it will go into 4wd..

 

[cousinjack]

Assuming it's an electric solenoid activated 4wd and not the old school lever type ?

 

[J.D]

Mines the electric switch on the right hand side over the wheel arch, the lights on the dash go on and off but can get stuck in 4wd

 

[daveydiesel1]

Are u sure the brakes pedals are comin fully up as to not be engagin the 4wd for brakin

 

[cousinjack]

Our 399 got stuck in 4wd once and it was a mechanical problem inside the gearbox.. but I'd say this is unlikely..

Much more likely to be an electrical issue I'd say ...

They are powered into 2wd so any interruption in power will throw it into 4wd..
Check fuses, handbrake switch, footbrake switch, and solenoid for activation..

 

[masseybreaker]

uj's on prop shaft ? or sliding bit seized up

 

[defender]

Check the front propshaft , is there a mid bearing on that is worn, are the front axle bushes worn letting the shaft run out of true

 

[REStracTORATION]

I'd go with what @defender says

I suggest you get a jack and Jack the front axle up check for wear in your swivel hub bearings and half shaft joints axle center pivot and main driveshaft bland it's support bearings etc

 

[Dry Rot]

Probably not this, but I got a serious judder when using the loader. That turned out to be worn cab mounts. Judder went away when the mounts were replaced. If you get a vibration from some obscure source (tyre pressures?), strange things can happen.