Re: 5 Ton transfer case sprag replacement?

From: V SCHWARTZ (vsaws@optonline.net)
Date: Thu Dec 08 2005 - 06:08:34 PST


Now if you can solve my problem of my brakes locking up on my 816 I would
really like it Thanks Vinny
----- Original Message -----
From: "Squirt_Truck" <squirt_truck@yahoo.com>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Wednesday, December 07, 2005 7:48 PM
Subject: Re: [MV] 5 Ton transfer case sprag replacement?

>
> Guys,
> The sprags on the 5 tons give very little problems, they are big enough
> that failure seldom occurs and the truck are heavy enough that lock-up
> is also rare.
>
> BUT, this being said, the air cylinder that operates the sprag
> directional control is subject to the poppet valves on the reverse
> shifter rail, and the valves are tempermental when maintenance is not
> regular.
>
> You can not just listen to the case shift to accurately idnetify that
> the piston moves. The norm is to move when going into reverse and
> usually will snap to netural when moving out of reverse. THe forward
> valve sticks, the transfer (front axle) goes to netural and you have 6x
> in reverse and 4x in forward.
>
> Bet if you check the two air hoses, one on the cylinder and one in the
> top of the transfer case you will find no air on either in the forward
> gear selections. The cylinder is not in the back it is in the front
> adajacent to the front drive shaft, right above the sprag case.
>
> It can be tested bu jacking up one front wheel and spinning it, in
> forward gears, the wheel will spin freely forward but not backward and
> just the opposite in reverse. (ONLY reverse, netural counts as forward
> and any other gear.) If this is not what happens, try adding air
> pressure to the cylinder and see if that is not what fixes it....then
> service the poppet valve, they can be taken apart and cleaned.
>
>
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