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Another thing about these trucks: be mindful of the order in which you turn off the truck when it's running. Turn off the engine switch first and then after the engine has stopped rotating shut off the battery switch.
If you shut off the battery switch first with the engine running it can...
OK, the -20 TM has a bit more info. there are two different brakes; a drag brake to resist free-wheeling and an automatic brake to maintain winch position when the PTO is disengaged.
I would suggest reading up on the winch functionality in TM-9-2320-260-10 found in the TM download section - it's good reading!
And check with Eastern Surplus or TNJ Murray for the missing data plates.
To keep the drum from freely spinning the drum lock knob on the driver side has to engaged. It has a pin that protrudes into one of many slots in the drum side flange.
The brake holds the load when the clutch is depressed and cuts out the PTO power.
Here's how you find the answer:
Download both halves of the M809 Technical Manual for parts that covers your M813A1 (TM 9-2320-260-24P-1 & -2)
The index of the first half will direct you to the rear brakes & hubs section with an exploded view of the parts and a Bill Of Material. Copy the NSN...
Look for wetness on the brake backing plate and at the bottom of the drum that would indicate a leaking wheel cylinder. On mine, it needed 5 of the 6 wheel cylinders rebuilt and it needed its hardened rubber brake hoses replaced.
I would drain the radiator to check and get rid of any nasty...
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