How to
Rebuild a
Welch 1402
Vacuum
Pump
Step-by-Step
This guide is dedicated to Welch, the designers and manufacturers of
a very impressive line of vacuum pumps --- really well-built, very reliable.
If you want to have fun,
If you don't mind the MESS,
If you like taking things apart,
If you need a cheap pump,
Buy a used Welch 1402 vacuum pump on e-Bay and this guide can help you make it right.
A Welch 1402 pump usually fails because of lubrication --- either the oil was not changed regularly or the pump
ran dry and it stopped turning.
Other problems (like the motor) can cause the pump to stop but this is the most likely.
For the price of:
--- new gaskets,
--- new springs,
--- new spring holders,
--- new vanes
there's a good chance (no promises) you can get the pump running fine. You could even check out the price of these parts before you buy the used vacuum pump.
To avoid vacuum pump failure and keep the pump running great? Change the oil regularly AND use a vacuum trap.
Thanks to the vacuum pump service professional in Chapel Hill, NC for the inspiration to make this guide
available for free to anyone who wants it.
All trademarks are property of their respective owners.