logan97
Gold Member
when the differential rear is locked can the front be engaged in 4/wd ?
Differential rear lock
- Thread starter logan97
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Toolguy
Platinum Member
Yes...
actionaj
Gold Member
Yes, just don't engage the lock if the rear wheels are spinning.
ovrszd
Epic Contributor
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- Kubota M9540, Ford 3910FWD, Ford 555A, JD2210
The 4wd engagement simply locks the front driveshaft to the same rotational speed as the rear axle pinion assembly.
The Diff Lock simply locks the two rear axle shafts to the same rotational speed.
Neither interferes with the engagement of the other.
Warning, when the Diff Lock is engaged the tractor will not want to turn. With both rear axle shafts locked at the same speed it will only want to go straight. That's why the Diff Lock is spring loaded and requires constant input from the operator to stay locked which is a safety procedure to help prevent the turning problem.
I frequently use the 4wd and Diff Lock at the same time. Provides you with true 3wd drive. True 4wd can only be achieved if your front differential has a locking device. I don't know of any tractors that do.
The Diff Lock simply locks the two rear axle shafts to the same rotational speed.
Neither interferes with the engagement of the other.
Warning, when the Diff Lock is engaged the tractor will not want to turn. With both rear axle shafts locked at the same speed it will only want to go straight. That's why the Diff Lock is spring loaded and requires constant input from the operator to stay locked which is a safety procedure to help prevent the turning problem.
I frequently use the 4wd and Diff Lock at the same time. Provides you with true 3wd drive. True 4wd can only be achieved if your front differential has a locking device. I don't know of any tractors that do.
gwdixon
Elite Member
The M7040, M8540, and M9540 all have an automatic front locking differential (limited slip). It was one motivation for purchasing the M7040 recently.
I have been in true 4WD only on a couple of occasions but it works just like you might imagine. Four R1s gripping the ground with 70HP is impressive. It is not like a big ag tractor but is plenty enough to do anything on a small plot.
20 20
Elite Member
yes it can, just remember to disengage before turning on hard surfaces
ovrszd
Epic Contributor
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I didn't know that gw, thanks for the info.
I'm a Jeep freak and frequently use a mechanical locker in the front axle. The multiplication effect of that added traction is amazing. Must be used wisely as you can bust front axle components by a simple blip of the throttle!!!
Huh, I thought that it was ok to do that - at a reasonable speed - so that it engages easier and you then gain traction. I'm wrong on that?
DavidAubke
Silver Member
I also thought this was OK - within reason. The only way I can get things to align properly for the lock to engage is to let the slipping wheel spin slowly while putting a little pressure on the locking pedal. I wouldn't just jam it down while the wheels are spinning quickly but otherwise...
