Mighty Vac won't hold vacuum.

[bwh998]

I have a Mighty Vac I've only used a few times, but it stopped holding vacuum. It will draw vac when you squeeze the lever, but just releases when you let go.

Are these rebuildable? I imagine it's a tore diaphragm or o-ring, can I get replacement parts and fix it?

 

[Warrenator]

I have taken mighty vacs apart, cleaned and reassembled, you need heavy silicone grease if I recall correctly. Sil-Glide ought to work, I used Dow COrning Heavy Vacuum Grease.

 

[bwh998]

Cool, I will pick some up today and take a look at it.

Thanks.

 

[drhonda]

might was losing vacuum at the cap of the bottle when I had it attached. Had to make a new seal for it.

 

[bwh998]

Mine's leaking somewhere internally.

 

[TwoInch]

yes, they are rebuildable. mity vac sells kits and parts.

silicone lube, or vegetable oil. no petroleum.

here is the breakdown
http://www.mityvac.com/user_manuals/MVM8900Manual.pdf

 

[bwh998]

Thanks, found the rebuild kit.