Traction MFWD-Does it lock rear diff?

[Sawyer Rob]

One of my tractors is manual front AND rear...

SR

 

[SPYDERLK]

It is easily possible that both rear wheels can spin without them being locked by the differential lock. If tractive forces, are equal both rear wheels will spin. Study how an open differential works, and it will answer your questions. One of the best ways to help with this is an old GM instructional video.

,,, ... And even more easily possible with AGs. -- Due to the action of the angled tread jamming the soil as it slips, a forward going AG will exhibit a little more pull as it slips. Thus one side with slightly less traction could slip a little causing its traction to increase enuf to make the other tire slip. When theyre close you can observe each tires spin to stop - start in little jerks as their traction advantage shifts back and forth.

 

[k0ua]

,,, ... And even more easily possible with AGs. -- Due to the action of the angled tread jamming the soil as it slips a forward going AG will exhibit a little more pull as it slips. Thus one side with slightly less traction could slip a little causing its traction to increase enuf to make the other tire slip. When theyre close you can observe each tires spin to stop - start in little jerks as their traction advantage shifts back and forth.

True, and if one side takes off and starts to spin you can slow it down with your split brake and cause the differential action to put more force on to the opposite tire with better "hook up" to the ground to get you going forward again. Just a little single braking action on the wheel with lower traction will often make the difference.

 

[rutwad]

My Massey Ferguson does the opposite. If you lock the rear differential it will automatically engage MFWD.

Does the design of the MFWD engagement also lock the rear diff? Or must you use the foot operated diff lock pedal at same time to get 4 driven wheels?