Critical FMTV PM not covered in TMs

Awesomeness

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DO NOT use skydrol (aircraft fluid)! This will ruin the entire system! If the system isn't designed to use Skydrol it will eat and destroy every part in the system that isn't metal! (I work at a major aircraft company and see what skydrol does to stuff... and that is turn stuff to goo rubber, plastic, paint)
I figured out you can by hydraulic oil by the gallon and 5 gallon pail. I just added some to bring the level back up. I'm not going to buy any special fluids unless it's required. It's actually novel to be able to buy fluids anywhere.
The system is designed for the aircraft fluids that Aleigh listed, and you DO want to use them. They contain corrosion inhibitors that will keep the system from rusting out from the inside, as a number of owners have found while using regular hydraulic fluid. There is no particular design flaw that allows water in (as Aleigh suggested), because there is supposed to be a metal cover over the whole rear portion of the pump that shields the vent... if you're missing it then that is your problem.

The fluid is more expensive than regular tractor hydraulic fluid, but not a big deal in the context of everything else on this truck. I think I bought it online for $6/qt, and the whole system uses 3qt. I think I got free shipping at $50, so I went ahead and bought 9 quarts, and have enough for a very long time now.
 

Awesomeness

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where can I find the piston? My seal was broken but the Piston inside was broken in 3 places.
If you have trouble finding a piston, you could always get one made. It's not a very complicated part. We would just have to measure up an existing one, and make a model/drawing for it. For what some people want for the whole latch, or other parts, it still may be a cheaper way to go.
 

JD4044M

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Great thread, I think this is my problem with the latch not opening and causing the hydraulic pressure to build to high and blew a seal on the latch. The hand pump works good it can put out great pressure! Air Pump spins nice with air real and coasts down for a while till it stops. It was clean and so was the sump. Spare tire works the way it should and that leaves onlyDSCF6382.JPGDSCF6383.JPGDSCF6384.JPGDSCF6388.JPG the latch where the fluid came from. I will pull the latch apart tomorrow and deal with the seals. Guess the fluid is/was the right color.
 
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