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I took a look in the manual and indeed there is a valve below the turbo, thanks!

My M920 heat isnt working properly, in that the fan works fine but the air is not warm. I drove it 50 miles this weekend, but there was no difference in the duct temperature the entire time. Where should I start looking first?

Here is a picture of the light when it is on, I suppose it is just alerts you that you are in overdrive?

Here is where the light is, look for the black arrow just right of the rpm needle. These units are rated with a top speed of 55 mph I believe, my light starts flickering at 50. I suppose I will have to drive it and see at what speed the transmission deactivates.

The small red light on the tachometer/speedometer gauge (near the top) came on around 50 mph and 1900 RPM, was flickering, clearly I wasnt pushing her too hard, want to make sure the light isnt a problem because she sure settled down in 16th at this speed and it felt like she could do much more...

When shifting into 16th gear, at highway cruising speeds, a red light flickered in the top of the dash gauge, the one for speed and engine speed. What does the light indicate? I was about 2000 RPM.

Here are two youtubes that will be helpful with regard to how to shift an M920 or M916. http://www.youtube.com/watch?v=vNAwp1w347Y http://www.youtube.com/watch?v=uNeuxDhbL5A Key is to let off the fuel a bit when shifting. Start off in 6th gear with no load, you can shift two gears at a time...

Here is a source for Cat 7155 transmission operator and user manuals http://www.jensales.com/Caterpillar-Truck-Trans-7155-Equipment-Service-Manual-CT-S-7155-TRAN_p_83552.html http://www.jensales.com/Caterpillar-Truck-Transmission-7155-56K1-and-Up-Operator-Manual-CT-O-7155-TRAN_p_68518.html

Here is what I found for the correct oil to use in the Cat 7155 trans.

Ok thanks. I am not sure what is in the truck now, should I drain and refill the trans fluid or just top it off. thanks

What is the correct transmission fluid to use in an M920?

thanks. I am going to have a ten ton tag-along trailer made that has 24 volt lighting (also 24 volt ABS brakes), as well as NATO style plug. Will use this to pull my halftrack.

What is the trailer voltage on an M920, 12V?

For the M920, what is the white plastic bottle on the floor of the cab for? What fluid does it hold, what is its purpose?

shifting Yes it does, thanks. Suppose practice makes perfect........

I have owned an M818 for a couple of years but these just don't have any guts so I upgraded by purchasing a M920 in good condition from C&C Equip in Indiana. Vehicle is a good runner, 26k miles, new paint job and tires are 90%. I have scoured the govt manual but want to learn some tricks about...