Hiss from Wrecker rear winch tensioner, What's normal?

[jhooah]

Group has a M543A3 Wrecker, since returning from Afghanistan last week, I've got her running (Albiet on 5+ year old fuel) the brake master rebuilt today and the boom lift cylinder hose replaced.

I noticed a hiss of air leaking from the rear winch tensioner (looks like a Semi-Truck brake actuator)
Anyone know what "normal" is for this, (like is there a pressure valve making the noise?) and if it's leaking, source for a possible replacement? As this is very close to a commercial brake actuator in appearance, I would think Bendix or such has one available at NAPA. Worst case I'll cap the line for safety as I would not want to loose air pressure if the hiss turns into a BIGGER leak.
V/R
Adrian Winget
Virginia

Virginia Military Preservation Association www.VMPA.us

 

[Gamagoat1]

It shouldn't hiss at all. It's just a simple diaghram. See if you can find the leak, maybe you'll be lucky and have a loose fitting.

 

[jhooah]

Thanks Mike.
I figured it was a simple part, I'll look through the Parts Manuals and see what references, then hit NAPA if I do find it's leaking (and not the line or fitting)
Thanks again.
V/R Adrian
Next to find a right side PTO for an old Spicer transmission in that beast...Then the front winch can be set back up.

 

[54reo]

Mine (M816) leaks BAD from the same source. I have yet to get around to fixing it, but I assume it is the diaphragm.

 

[Gamagoat1]

There's nothing to making a new one, the hard part is finding the material to make the diaghram then punching all those little holes.
They are really fun rigs if you like tinkering on machines. Lots to fine tune.

 

[DaveP]

even if the pancake is bad, it shouldnt be leaking unless the tensioner is activated.