series transfer box

[Bluemoon]

for a series gearbox and transfer box am I right in saying,

when in low ratio, the output speed to the props is the same as the output to the power take off,

cheers Brian

[tuko]

Yes you are correct, the intermediate gear is doing that for you.

[oddballrovers]

Hi Brian

If I understand your correct then you are asking if the speed of the props to the diff's,and IE a prop driven from a PTO fitted to the back off the gearbox are the same in lowgear?

The speed is not the same there will allways be the difference that the transferbox makes, wether in low or high range, the PTO however follows the main gearbox IE in 4 gear the speed is the same as the engine.

Regards

Ole.

[Bluemoon]

I was hoping they were the same speed, to drive two rear axles while in low ratio with two separate props, I know its been done but didn't know how,I was hoping for an easy answer.

cheers Brian

[Phil Hancock]

to drive two rear axles while in low ratio with two separate props

Yes i saw it done but IIRC the transfer box had been converted to a 1:1 ratio and the sliding dog for the PTO was replaced with another output shaft sliding gear. There was no interlock between the 2 outputs so it was possible to have the front and middle rear axles in Hi and the back rear axle in Lo. Not the brightest of moves!

[Bluemoon]

yes that was what i was after, just engage the pto when low ratio is engaged when offroad, have you more detail what parts are needed or how it is done, cheers brian

[Phil Hancock]

I believe that the 1:1 conversion was by Ashcrofts who have discontinued manufacture as it involved moving the idler position & making a new larger input gear that was the same tooth count as the output, the result was that the shafts were no longer all in line so if the idler bearings failed it would be possible for the gears to jam and lock up the drive.

The PTO output did give a Hi, neutral & Lo ranges as the normal sliding tooth ring was replaced with another output sliding gear & the PTO selector rail detents had an extra notch.

[Bluemoon]

so not a simple fix, but interesting all the same, wonder if there is any old stock,

cheers brian

[Phil Hancock]

I doubt it as i did speak with Ashcrofts 20? years ago and they did not then and had no plans to make any more as they did not like the gear shafts not being in line.