Regular inspection and replacement of air filters will prevent extensive and costly supplied air pump repair. Dirty or clogged filters can be responsible for failure of the pump to build up outlet pressure and eventual overheating.
Bullard recommends replacing your fresh air pump's medium efficiency inlet filter at least once every 500 running hours or sooner if necessary.
The inlet filter keeps moisture as well as particulates out of the air supply and helps protect the pumps carbon vanes. For the Bullard S17101 Carbofine outlet filter see item # BL-S17101. For a repair kit that includes both filters and four replacement carbon pump vanes see item # BL-15921.