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. I think somewhere you stated that the 1500 /1800 RPM engine speed was something you were told? If not, that is a requirement. Running at idle speed for example will end up "smoking" your Allison transmission. Might be that it is written down in the TM, but I have seen that number in writing...

. So I hate not to be able to contribute more, but I will definitely be interested to see what happens. @Csm Davis may have more information about the rotation motor. Past experience and lots of wreckers at his place

. Most of us know nothing about it and how the rotation motor works on the M936. Might even be all of us for all I really know. The TM's show nothing but the shape of the motor and all the tech info is that you refer the problem to the next level of maintenance. Apparently those folks and...

. Chances are that you have "hose crud" (decomposing rubber) getting sucked through the system. I would expect you to find that in the tank filter in mass quantities. Could be wrong, but hose rubber will eventually clog up the valves and the rotation manifold is going to catch a lot of it...