Search results

To nitpick a little, according to the warning label posted above, the Army didn't get the 11:1 ratio for reverse since the transfer isn't supposed to be in "LOW" when in reverse. I like to compare features with other vehicles, in particular the m656/xm757 series, which kind of got lost in...

At least that design compromise came with a warning...(unlike the panic brake-engine-stall problem)...

Started to look through the PS magazines I have and found this, not directly related, but another possible "problem" with the drive train...

The adjustments of the linkages shown in my post above are apparently critical and do in fact effect the lock-up release.

No there is no communication between the brake system and the transmission on the xm757 (linkages shown in image below). All six gears lock up, but only when the rpm is high enough (=governor pressure?), so perhaps a combination of throttle position and pressure in my xm757 case? The xm757...

Right, the question still remains; why does the engine stall? A delay in the transmission lock-up release? Is the driver braking with his/her left foot?

Well Chris experienced the "stall" problem and that's what, at least I, am looking into... The treadle valve may be an important part of this problem, here is a patent (for the sake of discussion) showing a valve which limits the amount of force applied to the brakes.

I'll keep looking as well on the assumption that the engine stalls because it's still locked up due to some delay in the release mechanism.

Below is a page from the TM. Question; is there an equivalent to the throttle position sensor on the M939 series? When you let off the "gas" pedal, the transmission knows when to release the lock-up, my 8x8 has this throttle position linkage, but I don't see it for the MT654. What is the...

On a civy car (vacuum available), this is addressed as follows: " The vacuum switch in the "TCC Automatic Lockup" wiring ensures that the TCC unlocks in situations of low or no vacuum. Since it's hooked to a ported vacuum source, this means the switch is open at idle and when the engine is...

So, the problem has to do with the release of the lock-up condition. Not responsive enough? Is this peculiar to this transmission (MT654) only or would it apply to my 8x8 TX200-6 (MT31, MT41) also, I wonder.

Unless the transmission is mechanically locked, the torque converter should provide the slip...but this is where an expert comment would be desirable. The stall test described above demonstrates this "slip", I would think.

I'd like to see a response to the "stall test" posted above. My 8x8 is also an automatic, but never heard of an engine stall problem. Is this a transmission problem that is indirectly fixed with ABS? It'll be a while before I try a brake test like this on the hilly and windy roads around here...

Does it stall in any of the 5 gears, or just the 5th? Seems like the torque converter should provide slip and keep the engine from stalling... Is there a transmission expert out there, who can explain why this "stall test" (image below) would or would not apply to the situation discussed...