Hydraulic AWD

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plym49

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Slow speeds and very inefficient. Great packaging options, as you noted.
 

tobyS

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Hydraulics is less efficient that a mechanical linkage (transfer case). Have you ever purchased a hydrostatic transmission for a tractor?? ....lots of $$$$. There would be at least 2 hydraulic motors on the front and they are disengaged (probably hydraulically) when in anything but first or reverse. Check out it's price and get back with that info please.
 

TehTDK

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http://www.constructionequipment.com/tuthill-ez-trac-hydraulic-front-wheel-drive-heavy-trucks said:
EZ Trac is the first commercially available hydraulic front-wheel drive system for on-road trucks. Installation does not require a change in truck ride height, so the vehicle's center of gravity remains low, and Tuthill says factory steering angles and ride comfort are maintained. When disengaged, the hydrostatic drive saves fuel compared to mechanical drive systems, and front-wheel drive power can be engaged on the roll at up to 20 miles per hour. The entire system weighs about 1,000 pounds, which is 800 to 1,200 pounds less than comparable mechanical-drive add-ons. Estimated list price, installed: $40,000
That's a tad pricy I would say
 

wreckerman893

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Wreckerman do you know what they are asking for this gizmo?
The rep was there touting the system and when we got on the subject of military vehicles he said they were trying to sell the system to the gooberment. I can't remember the exact dollar amount but it was way past ten grand for a system to go on a large Ford or International.
 

quickfarms

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The idea has bees around for ages and was used on some of the early AWD tractors. It is really an assisted front axle since it is very difficult and expensive to sync it with a standard rear axle.
 

plym49

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This is just a way to help yourself crawl away if you get yourself into trouble. It is not a system that can be used at normal road speeds. As such, it is at best an interesting toy for bespoke applications and not anything that will be taken seriously.
 
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