Recent content by steelcaptain

Still haven't verified if mine is in fact bad but I may buy one regardless if your asking price is reasonable?

My genset had a bad I/O module but before replacing it, I could crank and start it. After replacing that it will crank, start briefly but immediately shut down with a low oil pressure alarm however I know the oil pressure is good. Tried to start it with the battle short switched on but that...

Recently I won this M812 from GSA auctions which had been turned into a water tender for a rural fire district and several sources have told me that the truck is somewhat different than a standard lwb M809. Of course the most obvious difference is that the truck is on 14.00 tires and is over...

Here is a photo showing that red heart on the CIM

So my primary question is if there is no flashing "heartbeat" LED on the I/O module, why is there a red heart symbol flashing on the lower right of the CIM? Regarding getting a good replacement I/O module to verify if mine if in fact bad, I have already gotten one coming. Frankly, I was...

Made an offer for the one on eBay which the seller accepted so will be getting a replacement regardless if I need it or not but still would like to know if I can determine if the one in the genset is really bad?

As an update, there is a guaranteed TCM-100 I/O module on eBay for $450 which I will likely need to get but still hoping there might be some tests I can do to confirm that it definitely my I/O module is in fact bad? Anybody there to help?

Here is my situation. Got the machine from GSA Auctions and on first start this is what I have discovered. CIM turns on and displays an oil pressure fault. Engine starts easily but no network fault light before cranking it. Fault cannot be cleared. After starting the CIM shows no voltage...

is there any description available how the air over hydraulic system functions? I assume the master cylinder provides hydraulic pressure to the air assist cylinder which itself then adds pressure to push the fluid to the wheel cylinders but how does the air assist do this? I also am...

this is according to Wikipedia: "Early M939s were rebuilds of M809 vehicle chassis with a new automatic transmission, transfer cases, cab, and hood"

Can I chime in to ask confirmation regarding early M939 trucks where rebuilds of M809 trucks? If true was this rebuild done to trucks already in inventory or to trucks built by AM General but not yet delivered to the DoD (or both)?

I see no grease fitting and the lubrication order for the M809 trucks doesn't mention there being one

well to me the sound seemed much more like metal on metal

please tell me these engines don't have plastic impellers...

that did occur to me as a possibility but thought after being run long enough the air would get pushed out of the pump and make its way to the overflow tank? this went on for 10minutes until I shut the engine down and decided to ask on here for advice