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Yes. Once I put the new 5C-13-K24 coil in, everything worked just fine. The system started out with the flashing highwy light like it should. I ran the truck for about 1/2 hour and let the system do its thing. At first, I was concerned that the system wasn't working because it cycled several...

I just wanted to post an update on this. I was able to find a coil that worked to repair the bad coil. I called the original manufacturer of the coil, Peter Paul. The said the part number I had was was very old but, unfortunately, they were not able to give me a good cross reference. I looked up...

I repaired the CTIS air Valve (Pneumatic Control Unit) on my M931A2. The controller was showing a "no lights" error. When I looked up the error it indicated a bad coil on the pneumatic unit and, sure enough, it was bad. I found a new one online - not a perfect match at 85 ohms resistance -...

In case anyone wanted more confirmation about part numbers - I just found my invoice from October 2014 and I confirmed that the parts I listed above are indeed what I installed on the 1991 M931A2. The new fuel pump was a little different than the one on the truck but, again, it fit and works...

So.... I have decided not to repair this broken fan clutch now and obtain a good used fan clutch. I have found a couple of options. One is a Evans unit like one I have but the other unit is made by Horton which also appears to have been a supplier for these parts. Does anyone have any...

I ordered the gasket and the 2 sealing washers with the pump. - I could not find my invoice so I don't recall the actual part numbers I received. I did check my online shopping cart and I think I got the parts below... again, If you are getting them direct from Cummins, just give them the engine...

I ended up with the 4988749. You can probably just call up your local Cummins dealer and confirm. I found that they were as cheap as anyplace else. Just give them your engine serial number and they will let you know. I also created an online account for Cummins QuickServe. You can put in your...

Check out post #11 here.... http://www.steelsoldiers.com/showthread.php?110515-M939-Lift-pump-AKA-transfer-pump-priming-pump-part-numbers-M923A2-M925A2-5-tons/page2 I just bought one from Cummins and it also looked different than the one on the truck but bolted on just fine. My old one looked...

I've used Bose A20 aviation headsets in my M923A2. They are quite pricey but they get the job done. I wore them on my recovery from Sparta WI, back to Southeastern Indiana. The great thing about these is that they are 1) noise cancelling, 2) have a bluetooth option, and 3) have auxillary input...

Swamp Donkey... thanks for the input. Yes, the clutch was pretty much the problem. The spring was pushing the "thrust cap" up against the main pully sub assembly and locking everything together. there was still enough relative motion to wear a big groove in the thrust cap. My clutch appears to...

The fan on my M923A2 was running all the time and I thought it was a bad shutter stat. I put in a new shutter stat and that was not the problem. (Yes, I know I should have tested it first) I then removed the fan clutch and took it apart yesterday. I found that the thrust cap inside the clutch...

Great discussion Ron.. I did more reading this morning and I think older trucks used some kind of ball joint that required them to be bathed in grease. The newer M939 trucks appear to have CV joints. The parts manual -24P shows only CV joints but the maintenance manual -24 shows both universal...

Bryan, I think Ron is technically correct that the LO says to add grease to the knuckles via the plugs. However, I have't seen the procedure that Ron decribes (perhaps it is implied) and I'm not sure what the ball and socket axle coupling is that he is referencing. This may be a opportunity...

Bryan, Welcome to Steel Soldiers. I assume you are talking about the steering knuckle boot. I had one tear when I first got me M925A2 and had the same questions. After doing a lot of research, I started using Valvoline Cerulean grease. See my post #74 at...

Some people have put Dexron III in the transmission to help. I did that and I think it may have helped a little but didn't solve the problem. I have 3 M939A2 trucks and 2 of them seem to shift just fine from 2nd to 1st and one of them is pretty hard even after using the Dexron III. My next step...

David, Closer is almost always better. Unless you really have time to work on a truck, I would recommend one that is in good running condition for a first truck. I have purchased trucks out of Little Falls, MN; Sparta, WI; and Indianapolis, IN and drove them all home. The truck that I...

...so here is an update on my search. I called an Allison approved service center and they said they could not find or get the part but they did say that they can have a custom unit made for about $175. I just need to tell them the length etc. I also found a source on the interweb, Custom...

Rory, I just re-read your orignal post and I missed the part about never engaging the parking brake. I would highly recommend getting into the practice of engaging the brake every time your park the truck. The truck will roll away in Neutral! Don't ask me how I know. :doh: Don

Rory, How much time do you give between releasing the parking brake and before you try to move? I have one truck that takes a long time for the air to bleed off the brakes and I need to wait 10-15 seconds before I can move. This is one thing I need to fix on mine but haven't so far since it is...

I'm thinking about something similar. I really haven't looked at the details yet but plan to fabricate a plate to use the old holes if possible. The passenger side may need new holes drilled anyway and I'm not sure what I will run into once I pull the battery box out. I have a set of 4 drivers...