My vacuum caster -Pro Craft model #21.819 is giving me trouble.
The motor works, but it wont produce a vacuum. Oil has been
changed. It's at the proper level. Help! I don't know what to do.
Well!.. went through that for 5 years…never found the problem
…TILL!!.. it finally broke!!! I tried every possibility known to
man and talked to some beast as well, they didn’t now either!!
Went it broke!!! ‘‘A’’(maybe not the right one) problem was the
coupling between the pump and motor. The coupling was made of a
bakelite or hard rubber and fractured (I believe that it had been
sliping and therefore a vac was only established whenever the ‘moon
was in acquarius’!)
It could be the silicone pad isn’t sealing,
It could be your investment top/bottom is too thick or too thin in
There isn’t enough room in the cylinder to establish a vacuum in the
cylinder (need 1/4 inch at the top,
You have burned rings in the silicone pad such that a vac can not be
establish… Pad temp by specification should not exceed 900F,and on
and on, and on!!!
But, my machine was several years old when this happened.
Switched to Centrifugal… am very, very happy that it broke …
really don’t have time to mess with the many, many problems associated
with vac casting. Sorry, really don’t wish to re-start the ‘vac vs.
centrifugal’ again! Vac is the way to go for large castings or large