Eliminating air srag on 5 ton!!!! - Steel Soldiers::Military Vehicles Supersite

atvcat33 · 03-20-2011, 13:40

I have a idea..... Couldnt you block the air lines going to the sprag, eliminate the sprag, and plumb new lines to the transfer case, with a air toggle simular to a duece, i was thinking this might work, knowing there is no electrical engagement just air.

Some people say you would half to flip it in and out for reverse and shifting gears and have to toggles, but i dont think so...

I have a 818 and a m62 both with sprag problems and want to eliminate it all together, just looking for another opionion

jasonjc · 03-20-2011, 17:06

NO

The sprag is not air, the shifting of it from fwd to res is air. To eliminate it you would have to regrear the t-case, like they did on the deuce t-case.

quarkz · 03-20-2011, 17:17

Oh, your talking about the sprag.
I read your title as eliminating drag on a 5 ton.
And I think you have to get up to +60mph before drag becomes a concern.

Nevermind.......

jwaller · 03-20-2011, 17:28

cannot be done. there is nothing electrical on the sprag or transfer or transmission anyway.

you can turn the air off to the sprag so that it won't work but then you won't have 6wd. there is no good way to eliminate it.

atvcat33 · 03-20-2011, 19:02

what exactly tells the t-case to go into 6x6, and take it out of 6x6???, mine never worked from day one so i dont know how they even work all together

area52 · 03-20-2011, 19:06

this is my understanding of the sprague, sprag transfer case-

It is basically a clutch operated t-case based off of the front and rear wheel speeds. when the rear wheel speed is approx. 7% faster than the front, (i.e. slipping) the clutch engages and sends power to the front axle.

The valves on the transmission "tell" the transfer case whether or not its in forward or reverse gear.

atvcat33 · 03-20-2011, 19:08

hmmm.... interesting, sounds like a complicated mess, i have a oshkosh mixer t-case, i think ill take some measurements

nk14zp · 03-20-2011, 19:12

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73m819 · 03-20-2011, 19:17

The sprag works on a demand bases, the sprag is a over running clutch, the gearing in the xcase over runs the front,, the way it's set up is as all the wheels are turning, the xcase inside senses a bit slower rpm, when the rears spin, then the xcase senses the rears are turning faster then the front which in turn engages the front wheel drive.

There have been many,many threads on the 5t sprag and the air valves along with the shifting cylinder

As a side note, my old 52 m52 and my 819 never gave me any sprag trouble.

When you go from forward to reverse and reverse to forward, do you hear the air release and the xcase sprag unit shifting ??????

jasonjc · 03-20-2011, 20:55

Think of the sprag this way as a rachet wench. If you pull on the handle it truns the socket. But if you trun the socket faster than the handle it rachets. The truck going down the road truns the front wheels faster than the t-case truns them. Now if the road does not trun the wheels then the t-case will.

Does this make any sence??

Almost forgo. The air shifts it from fwd to rev, just like the knob on top of the rtchet.