Problem with MityVac

[B8]

Not sure if this is the correct sub-forum to post this but figured I'd give it a whirl. I tried using my MityVac 7400 yesterday to drain my motor oil. I did everything like I normally do but this time I wasn't drawing a vacuum as I pumped the handle. Instead, some oil that remained in the body after my last oil change was being pumped up and leaked out from under the handle, making a huge mess on my garage floor. I don't know what went wrong or what to do. Is this user-error or has my MityVac stopped working after only 4 or 5 uses? Has this happened to anyone else? Thanks!

 

[flanso]

Yes. As I recall, there is an o-ring in the top through which the pump rod passes. On mine, the o-ring had folded over itself. It had not ripped, so I lubed it with silicone grease, put it back in place and everything work again. Later, it happened again so I phoned Mityvac; Their solution was to send me another unit, gratis.

 

[mechtech2]

Sure sounds like a faulty pump.

 

[B8]

Thanks, guys. |
Flanso - is the o-ring readily accessible? I'm really pushing my OCI.