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When I contacted Southern Automotive about a M939 PCB a week or so ago, they said they were currently sold out due to filling a large order; however they would be making more.
The sender might be bad, check the trans pan temperature with a ir gun or touch it with your palm. You can also switch the wires on the sender side of the engine temp and the trans temp behind your gauge panel to see how the senders are reading. Engine and trans temp senders should be the same.
Make sure that your cable operated emergency shut off valve is completely in the open position; otherwise a partially closed valve could give you the same symptoms. This needs to be reset and opened under the hood just above the pump, just pushing the cable in will not reset it.
Trace the airline back that is venting into the stack and you will more than likely find your problem. Might be a ruptured diaphragm in one of the air brake chambers, don't take the chambers apart if you don't know what you're doing, there is a strong spring in there that can cause injury.
I seen a couple of M931's pulling 2 of these trailers down the interstate after leaving Ft. McCoy running between 60 & 65 mph. They were pulling nice and straight, don't think I would try this with anything smaller than a 5 ton because of the weight.
All you need is the 1 large positive for the single wire alternator with the 1 ground wire hooked to the body of the alternator. The small Excitor wire and any others can just be taped up and left disconnected. This is what I had done on an M925A2 for a 1 wire 24v alternator and it worked fine...
With that knurled part by the threads, I would say it is a starter bolt also. Have you crawled under your truck to check? If it's yours, it's broke off in the block; hopefully enough threads to grab, not the end of the world.
I've never had any issues with the Illinois DMV submitting a SF-97 or an Arizona title, I usually submit a law cert signed by local LEO or a SOS police and get my Illinois title back in a week or so. It probably helps that my wife has worked there over 25 years to.
If you can spin it over good, it should start just fine. I've started my M925A2 in the teens with no ether, you'll probably see a little smoke until it warms up.
Could be a bad or wrong temp. sender on the transmission. Use a hand held temperature gun and check the trans. temp. in several locations, if you can hold your hand on the transmission pan, you know it's not running 250 deg.
Here's my 925A2 a few weeks ago during a parade, even had a few Soldiers to ride in the back, might be selling it in a few months to buy something else, haven't decided yet for sure. I like it better than I did my 813, 818, M35A2, M35A3 and my M923.
FYI, I replaced my bad alternator on my M925A2 with a 21SI alternator from Spidermarine, link below. I also purchased the 8 groove serpentine pulley from them, it was not listed on their website. I had give them a WAI pulley part # and they crossed it over to their number of 208-12003 (sku #...
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