Q. How do I know when it’s necessary to disassemble and inspect my melt pump? —Southeast extruder
A. There are five major reasons to disassemble a melt pump:
Since the pump is a positive-displacement device, output is affected by four factors: rotational speed; viscosity; pressure/orifice (die); and pump clearances. If items 1 to 3 have not changed, but pump output changes, then the clearances in the pump have likely increased due to wear. Since only the manufacturer knows the dimensional specification of the pump parts, it is advisable to return the pump for inspection. If you are relatively confident that the pump is worn, and are experienced, you may replace the parts yourself, strictly following the manufacturer’s instructions.
Dan Smith, sales manager
Maag Pump Systems Inc., Charlotte, NC
(704) 716-9081 • maag.com