816 hoist repair

[Crash_AF]

My 816 has a leak around the shaft of the hoist winch hydraulic motor. I looked in the TMs but can only find how to remove the motor, but nothing about how to disassemble it and replace the seal.

Is there a separate TM for the crane?

Thanks,
Joe

 

[Gamagoat1]

The motors and pumps are real easy to work on and the seals are O'rings. They are covered in the M543A2 manuals. Seems they left out all the hydraulic repair info when they build the 800 series. The manual covers a lot of stuff we need on the 816.
TM9-2320-211-35 page 462 shows a complete breakdown. I have one on the bench now waiting for O'rings. The problem seems to be that water sets between the o'ring and shaft and pits it letting it leak. the shaft can be polished and a little fatter o'ring will seal it. If it's too bad a sleave can be fitted.

 

[5tonpuller]

Mine had what they call onion paper in it. Really thin paper used as a gasket and spacer. Shinny magazine pagers work well for this. If it did not have any leave it that way. The clearance is very tight in that kinda stuff.

 

[Gamagoat1]

I put just a fine smear of aviation permatex on the spacers and it works great to seal the case.

 

[Gamagoat1]

M 816 hydraulic motor

Here are a couple of pictures that show the seals and internals of the wrecker boom motor. They are all the same so you will have an idea of what you'll find.