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If air is dumping when the yellow valve knob is pulled out, sounds like the air system is doing it's job, specifically the spring brake relay valve. Maybe the three cases of poor parking brakes are simply needing the rear brakes adjusted? These are wedge-type brakes and there are good...

After changing out the second blown front pinion seal, the cause of seal being destroyed is obvious. When I pulled the original bad pinion seal (A1205U2257) I thought the secondary seal (A1205F2502) was missing. It was not missing, it was completely destroyed. When I pulled the replacement...

There is now a tube coming from the front diff into the cab, and a pressure gauge on the dash. I will see if there is pressurization when I take the truck out for a parade tomorrow. If I come home with a lap full of differential lube you can all have a laugh. So far the CTIS has cycled a...

Great idea!

The front pinion oil seal has blown out again. The seal is completely intact but was blown out of the pinion bearing housing. It was stopped by the yoke/flange. The sealing surface was still seated on the surface of the flange nose. The seal was a tight, drive-in fit when installed so I am...

Mercunimog404, great info! Maybe that electric pump was why MB put the extra little drain plug in one tank?

Heat is certainly a factor but the best solution is to pressurize the gas all the way from the tank to the carb. Adding an electric pump at the tank is a start. But, both tanks feed from the top. The gas has to be drawn up to reach the pump and the gas vaporizes right there inside the draw...

Vapor lock is caused by the liquid gasoline becoming a gas or vapor. The typical fuel pump can't pump it, and the gas cannot be 'pulled' out of the tank. The old gasoline 404 Unimogs have an on-block mechanical fuel pump and the gas has to be pulled many feet from the tanks, through filters...

I've got three 404 Unimogs with the low compression M-180 engines and they have been burning regular ethanol-additive gas for years. No problems. Sure I prefer ethanol-free gas but it's not always available. A buddy in Knoxville uses a 404 mog as a daily driver and he runs lowest octane...

Got the pinion seal changed today. I've made some notes and taken some photos in case someone else has to do it. Yesterday, in preparation to pull the flange/yoke, I made up a puller to allow use of a hydraulic jack. Thanks NDT for the warning so I could be prepared. The job went well with a...

Thanks but I don't understand. What or when is "reset"? If "C" is for an annual inspection wouldn't a date be necessary to mean anything? Why does this seem to be the only truck on SS with a "C"? tnx,

Here is the data plate with the "C":

LMTV722, does your '93 have a "C" stamped on the data plate along with the "D"? I am still wondering what the "C" on my '94 means.

Wow, those trucks look great in civy paint!

Welcome! I saw your truck when I arrived at Durhamtown late Friday night but failed to catch you near the truck on Saturday, then you were gone. Looking forward to seeing your '1079. Bob

That statement in the manual makes sense if you consider that when off road the frame may flex, and the cab mounting has to follow. Flexing a cab is never a good idea. If the support frame were pinned, the cab on the FMTV could get tweeked even though it does have a pivoting mount in the rear...

Followup: the seal has not leaked again. I got to wondering if the leak (which happened in a very short time on the coolest morning this fall) might have been caused by pressurization of the axle. If the axle got pressurized, fluid could have been blown out. Went looking for a vent cap...

Hi OD, I wondered about mine, too, when first using the truck. Once the cab was raised and lowered a few times, and the latch assembly had no trouble with alignment as it settled into the cradle, I promptly forgot about it. BTW, There should be no more air leakage from the suspension system...

Hi OD, I never fool with the system either, leaving the air suspension 'on' all the time. Is there some reason you have concern about status of the cab suspension system when raising the cab? When the truck is shut down, as air bleeds down the cab does settle (but usually air bleeds very...

Scrapped ?!?! Bwaaaaaaaaaahhhhhhhhhhh