--- Buzz Szarek <buzz@toast.net> wrote:
> Be careful who you listen to. This is a common
> misconception about sprag
> systems.
+++++++
What is?
>
> It is more precise to think of them as a one way
> device. Like a ratchet.
++++++++++
When I got my M-135 the back wheels had no power to
them, one axle had a bad pinion, the other had a
broken axle shaft. They had been running it on the
front axle only. Because of the sprague clutch it had
no "hold back" from the engine, it went down hills
very fast. In consideration of your "one way device".
> 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.
++++++++
Sure, if it locks up like it should.
>
> Nobody who has ever looked at a sprag assembly would
> make the assertions you
> have seen here.
++++++++++
I've seen them, my M-135 has one, it doesn't always
lock up the first time. It drops out and re-engages
when shifting between forward and reverse. That's how
it was designed, you can see that one the parts
drawings, too.
>
> 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).
+++++++++
Yes, it does work at all speeds and in reverse, but if
you shift between forward and reverse it WILL drop out
and re-engage and if it doesn't catch the rear wheels
will spin until it catches. They don't all work to
spec.
Still, I don't think his problem is the sprague
clutch, it may just be that the rear wheels are
binding together. I didn't want to see him tear his
truck apart until he eliminated this possibility.
Joe
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This archive was generated by hypermail 2b29 : Mon Aug 07 2000 - 22:16:04 PDT