Be careful who you listen to. This is a common misconception about sprag
systems.
It is more precise to think of them as a one way device. Like a ratchet.
This is why it is critical to have the levers between the trans and the
transfer case correctly adjusted (they select the direction the ratchet will
free wheel). The most the rear wheels will slip before the sprag locks is
just about a quarter turn.
Nobody who has ever looked at a sprag assembly would make the assertions you
have seen here.
I'm basing this on my experience rebuilding the transfer case in a 1954
M211. YMMV.
Trust me, mine worked at all speeds and in all gears (including reverse).
-=-
----- Original Message -----
From: "Joe Foley" <redmenaced@yahoo.com>
To: "Military Vehicles List" <mil-veh@skylee.com>
Sent: Thursday, July 20, 2000 19:06
Subject: Re: [MV] Sprag problem
>
> --- DaveCole <davidcole@tk7.net> wrote:
> > Good point, since once the wheels are spinning, you
> > have no traction, or
> > at least very little at the rear axles. Who thought
> > up this system?
> > The more I think of it the more stupid it seems.
> +++++++++
> Ok, picture this:
>
> You're the army. You've got to get people and
> equipment to any point on the map. You've got a bunch
> of high school kids to do it with. Some came from the
> city and haven't ever driven anything, some are farm
> kids that have these trucks in their backyard, and
> there is everyone else in between. Some can take the
> trucks apart and put them back together again with no
> teaching, some can't put fuel in the right hole.
>
> What kind of truck are you going to design?
>
> ANYTHING AUTOMATIC IS GOOD!!
>
> Later you can give certain trucks to certain people
> according to their abilities.
>
> But then you have to consider where the weight is on
> the truck. With it empty the front axle is heaviest
> and gives the best traction, the rears are usually
> spinning. But with it loaded the front is less useful
> than the rears, its just helpful to have it pulling
> and not making another load.
>
>
>
> Joe
>
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This archive was generated by hypermail 2b29 : Mon Aug 07 2000 - 22:16:04 PDT