Another Sprag Newbie Question

[FSBruva]

gringeltaube -

So if i was wrong on both counts..... what effect (internally) does shifting into first gear with the tranny have on the transfer case? Does the shift fork that resides on the end of that reverse shift shaft have the capability to pull that shift collar forward?

On the second count - does that mean the "auto return spring" is a puller, rather than a pusher?

Matt

P.S. I guess one way I could figure this out would be to go buy a sprag deuce and pull it apart.... but I don't think the finance officer would approve that requisition request.

 

[gringeltaube]

Position of spring showed in fig. 4-39 is confusing. Look at the attached drawing and diagram, it will answer your Q.

To better understand the interaction tranny/sprag TC note following:

1) By default the sprag TC is engaged for forward motion (all gears), via an internal spring pressing the fork all the way towards the front against its stop. (shaft all the way OUT).

2) If shift rod length between tranny and TC is correct, TC shift shaft will NOT move back or IN while shifting tranny into any of its forward gears, including neutral positions between each of them!

3) Shifting tranny into reverse does following:
a) moves linkage/shift rod attaching point backwards about 1 ½”,
b) pushes TC reverse shift shaft back (IN), about 7/8” total travel, if teeth of sprag unit and shift collar are aligned; 3/8” if not.
c) compresses spring #12 inside the shift rod assy. absorbing the difference in travel.

Hope this helps!

G.

Edited drawing, showing internal spring and shift fork & shaft in forward position.

 

[FSBruva]

EXCELLENT information, as always!!!

Thanks!

Matt

 

[Rebelpride]

Wow, this is a pretty interesting crash course. Now I need to crawl under the truck and observe this. Thanks gringel.

 

[Rebelpride]

Drove the #2 deuce today, and I have a question. When I start off in 1st gear or back-up the deuce likes to hop. Am I doing something wrong(I give it plenty of throttle I think, and it seems to do it when I give it alot or at idle), or is my clutch on its way out.

 

[FMJ]

Drove the #2 deuce today, and I have a question. When I start off in 1st gear or back-up the deuce likes to hop. Am I doing something wrong(I give it plenty of throttle I think, and it seems to do it when I give it alot or at idle), or is my clutch on its way out.

One of mine does this in reverse, I can't seem to get it adjusted.....

Feels like it is binding.....

 

[gringeltaube]

Typical for deuces, has to do with their metallic puck clutch disks, combined with a not evenly adjusted pressure plate and the logical consequences concerning uneven flywheel wear.
Suffered more or less the same until I started replacing those 5-pad clutches with common (solid) fiber lined disks …, much better for driver and truck....

Start with checking/adjusting that pressure plate before pulling everything apart. If it doesn't help at all you probably need to have your flywheel resurfaced.

G.

 

[Floridianson]

FMJ if it feels like binding then crawl under and make sure the drive line brake is releasing completely and all of the springs are in place.

 

[appnut1]

I can add my two cents, sprags can be tricky. I had one that did not work so I posted some questions here -got alot of feedback telling me to adjust it, got under the truck and spent a couple hours adjusting this way and that way by the TMJ and got it working. Folks who bought the truck drove it two or three hours down the road and then claimed I sold them a broke truck because it did not work, niot sure what happened but the next truck will be an air shift for sure.

 

[Jake0147]

Drove the #2 deuce today, and I have a question. When I start off in 1st gear or back-up the deuce likes to hop. Am I doing something wrong(I give it plenty of throttle I think, and it seems to do it when I give it alot or at idle), or is my clutch on its way out.

One of mine does this in reverse, I can't seem to get it adjusted.....

Feels like it is binding.....

If it's a "rolling" hop, you could prolly suspect the sprag. If it's a "clutch chatter during the process of engagement" kind of hop, and it only happens in forward or only happens in reverse, the first culprit I'd suspect is a motor mount. Clutch and flywheel always spin the same direction.

 

[Sephirothq]

I have a good air shift in Pa for 300. But you would have to pick up. I really don't know how I would ship it.

 

[Rebelpride]

And it only does it from a dead stop, going thru the gears is smooth.
So what TM number would I need to find to check and adjust pressure plates and sprags.

 

[Floridianson]

Sprag TM 9-2320-209-20-3-1 or the sticky in this Deuce form.

 

[BEASTMASTER]

i don't know about that, when i go out plowing and push back intersections i always go from reverse to second and second to reverse, been plowing now for 5 years and ain't had no trouble with the sprag .as long as you here the sneeze when you hit neutral is when the sprag changes .

 

[tjcouch]

The manuals you want are TM 9-2520-246-34 and -34-1. They cover most everything for the adjustment.

Anyone know the page numbers off the top of their head?

 

[tjcouch]

NEVERMIND! Found it on the old forum: View topic - Sprag Adjustment :: Steel Soldiers :: Military Vehicles Supersite