GMG, Unimog, County and other lesser-known all-wheel drive off-road tools

[plewlandsbob]

Bray, they used Nuffield / Leyland skid units

 

[Arc Tourist]

Only photos I can show are of my diminutive 4WD tractor. It paid for itself a couple of times over in the 30+ years I owned it.
.

 

[plewlandsbob]

County also converted ,International and Leyland tractors. The axles on a Leyland county , are a lot closer together, than on a bray conversion.

 

[James1979]

Thanks for sharing

 

[stuvy]

Thanks for sharing the technical side of the engine and drive train always good to learn new things you never know when it might come in handy

 

[dan.taylor.1]

That yellow Nash is proper cool. We always had Case/International tractors when I was growing up so have a soft spot for the likes of 1255s etc.

 

[25.4_mechanic]

Continuation of the description of GMG_2.5:

After leaving the change speed gearbox [WG] (whose gears 2nd to 5th are force-synchronised), the engine power is fed into the transfer case [VG] - regardless of the drive regime chosen.

Integrated into the transfer case [VG] is a 1:2 torque distribution between the front axle [VA] and the rear axle [HA].


To ensure all-wheel steering capability, both axles are front axles of the heavy off-road truck W50LA/A, whereas the rear one in the GMG_2.5 is installed in reverse - the differential and the brakes had to be adapted accordingly.

The vast majority of switchable functions on the GMG_2.5 are air-switched, e.g. the driver can switch off the torque distribution and thus lock the transfer case [VA], the torque is then distributed 1:1 to the front and rear.

He can lock the front or rear or both axle differentials individually.

The driver can put all axles, gearboxes and differentials under excess air pressure to allow deep wading without the risk of water entering the housings.

Of course, a lot deeper than shown here!


Hmmm, I'm a bit surprised why no questions have been asked here about the GMG_2.5 yet - back when I found out about the existence of this thing, my questions increased the more I got out ....

Have a nice Sunday evening everyone,


Carsten

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[zeppelin builder]

any one heard of an early ww2 armoured 4 wheel drive army truck called
"American 4x4 " it was used for years as a wood skidder localy and had its 6 cyl petrol engine replaced by a perkins
L4

murphy pipelines had a few ex french army 6x6 done out as welding rigs they were deutz v10
aircooled powered

 

[Migmac]

When they were harvesting woodland at the farm my wife works at they were running a couple monster felling and forwarding machines which were probably £3-400K but they still had a County running too with a blade on the front and winch on the back. Chap said in this modern world there isn't much you can buy that will do the same job as the county given it's small footprint.

Worked a county for a while, absolutely brilliant tractors in forestry.

 

[Rannsachair]

any one heard of an early ww2 armoured 4 wheel drive army truck called
"American 4x4 " it was used for years as a wood skidder localy and had its 6 cyl petrol engine replaced by a perkins
L4

murphy pipelines had a few ex french army 6x6 done out as welding rigs they were deutz v10
aircooled powered

The M4 tractor?
https://en.wikipedia.org/wiki/M4_Tractor

 

[plewlandsbob]

Here are a few pics , I found of tractors working in forestry. Found them here.

Home

https://www.forestry-memories.org.uk/

www.forestry-memories.org.uk

 

[stuvy]

I’d love a drive in one

 

[Bornfree]

A local sugar beet haulier tested one of these on the farm many years ago. It was amazing it would pull a full load of beet along a wet field without any problems.

 

[Barking Mat]

Used to have two Renault R2087, one a military ambulance, one a police radio control car.

Made one out of two.

Not mine, but looked like this.

 

[25.4_mechanic]

A local sugar beet haulier tested one of these on the farm many years ago. It was amazing it would pull a full load of beet along a wet field without any problems.

Very interesting vehicle.

Question: Was the manufacturer MAN also on board, the front looks so similar to them, I don't know how they would have got away with it if MAN hadn't been involved?

Thanks



Carsten

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[Bornfree]

Very interesting vehicle.

Question: Was the manufacturer MAN also on board, the front looks so similar to them, I don't know how they would have got away with it if MAN hadn't been involved?

View attachment 373814

Thanks



Carsten

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I don't think they used any Man trucks. Mainly foden some Leyland and there looks to be an ERF in the video. Sir David Brown was a very interesting man. His story is worth looking up.

 

[25.4_mechanic]

I don't think they used any Man trucks.

Ok, thanks.

I think I take that back as the similarities of the "house-front" are not as big as I had in memory.

David Brown was a very interesting man.

Oh, that David Brown?!?
I in fakt had read about him - David Brown tractors are especially cheap here and years ago I was thinking about buying one - and true, he was a very interesting man!

Carsten

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[fizzy]

Talking of unusual offroad vehicles

The Esarco 8x8 - basically 2 Defender chassis back to back to give front and rear steering.

 

[fizzy]

And of course the Lambo LM002 - and the Cheetah

obvious where they got the Hummer design from

 

[25.4_mechanic]

Lambo LM002

Oh yes, of course it fascinated me back then - but 25-100 litres per 100 km is not quite up to date ... not even then.

Only 300 or so were built ....

... of the much later successor Lamborghini Urus (yes, now all VW anyway) 214 were registered in Germany alone in the year 2021.

But it's great that the LM002 existed, not everything has to be sensible.

Carsten

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