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The first thing I would check is the torque bushings.

There are two types of switches, one hydraulic, the other air. Whichever switch you have will be under the cab by the master cylinder/ air pack. Without going back and looking, I think the ones that worked off brake fluid pressure were replaced later with ones that worked from air pressure...

The rusty sludge is normal. The reason for using a dish washing soap like Cascade is because it doesn’t foam. It isn’t necessary to flush with anything other than water after the Cascade cleaning. Remember just enough cleaning to remove the trash and not hurt the liners and O-rings. The...

Cleaning a cooling system is a balancing act. There is always going to be some stuff in the older systems, the question is how much to remove. If one gets to aggressive the normal oxidation on the wet liners can be removed, and that is certainly not desired. Also, large chunks can come loose and...

I would not be a good idea to remove the emergency shut off valve. If something goes wrong in the injection pump there would be no easy way to shut the engine down. The part is a standard item. It is available from Cummins and quite a few places online.

Agree with this and if you plan on doing a large amount of flaring the Mastercool 72485 kit is well worth having.

Everyone has their thoughts on this topic and no one’s views are incorrect. For me I have always installed what they came with. It may be a little more expensive in the beginning, however I find it pays in the long run. All my 5 tons have four 6TLs, except the M54A2. In my neck of the woods...

There is a supply line to the transmission and two lines going from the transmission to the transfer case. On the top right side of the transmission is the poppet valve assembly. Once the air tanks are charged, one will hear the poppet valves cycling when shifting into first or reverse. It...

The sprague unit works mechanically. The reason for air is to set the direction. When one shifts the transmission into first gear it sets the sprague into forward. When the transmission is placed into reverse the sprague is then in reverse. That is why one can’t coast backward when the unit is...

As Wes has posted all the differentials have the same gear ratio. The intermediate and rear axles do almost all the work, remember there is no interlock. Under normal nonslip conditions, when the truck is being driven forward the rear drive shaft will turn at X speed. The front wheels...

You don’t need a switch board unless you plan on running a lot of wire. If you use four TA/312s I would limit the total wire length to ten miles. If using TA/1s limit the total wire length to three miles. There are many ways to run the wire. Home runs, all the wire starts at the main...

It is from an 800 series vehicle. It looks like a right tank for a M818. I would have to check, the right tank on the M816 may be the same size. It is too late to go out and measure things. Can check in the morning.

My mistake on the FMTV. The air supply valve for the trailer is on the dash. So, it makes them easier to purge. Just push the air valve on the dash, as in supplying a trailer with air, then apply the treadle valve. Pull dash air valve out and your done. Disclaimer. I have a “little” bit of...

1. On a vehicle with a well-functioning air dryer you shouldn’t see any water when draining the air tanks. And just to clarify there are several air tanks in the system. The air comes from the compressor cooling somewhat as it reaches the dryer. The dryer then filters any oil out and condenses...

The symptom described sounds like moisture in the air system. To get some of the moisture out as Suprman has posted warming up the system is a place to start. With the truck running open the petcocks on the air tanks to drain them down, then close the valves. Allow them to refill and repeat the...

Bruce’s suggestion of condition, liked best, and price is spot on. Each series has its pluses and minuses. The M39 series are getting scarce, however they are the simplest design. The transmission is a five speed direct. The 800 series have a Cummins engine that doesn’t have a turbo, so...

Yes, the engine must be running. Basically, disconnect the return line and run it to a catch container, five-gallon pail, gallon jug, you get the idea. Fill the reservoir turn the steering lock to lock, check the fluid level. Turn lock to lock, check fluid. Keep repeating till clean oil...

For what it is worth. Hearing protection, i.e. ear muffs, were part of the BII of the trucks when in service.

The Peltors that I have use 9-volt batteries. When used on the range I probably get about two weeks on a battery, and that’s ten plus hour days. The batteries die from old age when used around the trucks.

The important thing about flushing and bleeding is to have the front tires able to move freely, hence having the front axle lifted. The bleeding of air occurs when the steering is at the stops. When there is air in the system one can hear it clearing, almost as a pulse, when purging. Just make...