Thread: Perentie drive line 6x6 & 6x4

Dont quite know what you are getting at.
They are constant drive with the 2 forward axles as in 4x4 with a centre diff lock then selectable drive to the rear or third axle.
On mine the third axle is set up to drive when I lock the centre diff. They are all vacuum operated shifts.

keith

As Keith says. On-road you have the front two axles powered, with an open centre diff to prevent wind up. The rear axle just goes along for the ride when the centre diff is open.
When you lock the centre diff, the rear axle is also engaged.

Hi,

Yes understand the centre diff set up with the gear box, constant 4wd 1st 2nd axle,

Question is around rear axle,

the rear axle is driven by the pto, Which needs to be engaged for 6wd ?

so what happens when they have PTO winch?

Or or is the rear axle being driven all the time? which would contradict free wheel hubs on the rear...

Originally Posted by Jackofalltrades

Hi,

Yes understand the centre diff set up with the gear box, constant 4wd 1st 2nd axle,

Question is around rear axle,

the rear axle is driven by the pto, Which needs to be engaged for 6wd ?

so what happens when they have PTO winch?

Or or is the rear axle being driven all the time? which would contradict free wheel hubs on the rear...

The rear axle drive unit gear is driven off the low range gear on the intermediate shaft which is in contact with the centre diff gear. This drive unit is selectable by a vacuum cylinder the same as the centre diff lock and actuated when you lock the centre diff. The rear output unit bolts onto the rear cover plate where a PTO would normally sit. The Perenties have a bottom PTO for the winch that is part of the cover plate that bolts onto the sump of the transfer and is driven by a chain that comes off the transfer input gear on the rear of the gearbox mainshaft. So the rear axle is only DRIVEN when you lock the centre diff but unless you have free wheeling hubs it will still turn or "windmill" all the time regardless of whether the actuator is locked or not. Hope that explains it!! I have free wheeling hubs on the rear axle of mine and changed the vacuum locker lines around a bit and added an extra switch so I can lock the centre diff without locking the rear axle drive unit. Reason I did this is so that I can lock the centre diff on the move and not damage my rear axle drive unit as it will not be turning with the freewheelers disengaged.

Thanks Brian,

needed the detail, wasnt aware of the vacuum setup,

is it possible that centre diff can not ingage but the rear axle can?

also should say have not seen one in person, understood how it should work but had contradictory info,

system was the same from start of production to the last of them?

Originally Posted by Bearman

I have free wheeling hubs on the rear axle of mine and changed the vacuum locker lines around a bit and added an extra switch so I can lock the centre diff without locking the rear axle drive unit. Reason I did this is so that I can lock the centre diff on the move and not damage my rear axle drive unit as it will not be turning with the freewheelers disengaged.

Did the free wheel hubs make much of a change?

have driven much off road mud or sand, is wheel spin a problem with centre diff locked?

Originally Posted by Jackofalltrades

Thanks Brian,

needed the detail, wasnt aware of the vacuum setup,

is it possible that centre diff can not ingage but the rear axle can?

also should say have not seen one in person, understood how it should work but had contradictory info,

system was the same from start of production to the last of them?

Anything is possible but if everything is operating correctly the centre diff and the rear axle drive should engage together. In normal configuration they are both plumbed into the same vacuum lines so if the vacuum cylinders are good they will both actuate at pretty much the same time. Yes they are the same from start to end of production in this area. The later Bushranger models had some small differences in some areas to earlier production but the 3rd axle drive setup is the same.

Originally Posted by Jackofalltrades

Did the free wheel hubs make much of a change?

have driven much off road mud or sand, is wheel spin a problem with centre diff locked?

I don't know whether the freewheelers have made much difference to fuel consumption but the main reason I wanted them was to stop the rear axle internals and drive shaft from turning when I don't want to use it. Now the rear diff and driveshaft should last virtually forever as I rarely engage it. Haven't done any mud work so far but have done some bush work and sand driving. I have Detroit no-spin lockers in both rear diffs plus a Trutrac in the front so don't get any wheelspin at all.