Overhaul Kit, Pfeiffer UNO 250A

Pfeiffer - Oil Sealed, Two Stage Rotary Vane Pumps

• DUO 120A – standard version
• DUO 125 (Index B) – standard version
• DUO 125M – magnetic coupling
• UNO/DUO 250A – standard version
• DUO 255M (Index C)  – magnetic coupling

* MC version – Corrosive gas application (with magnetic coupling)

Oil Change:

The maintenance schedule of operating fluid depends on application and location of pump. The oil must be changed if:

• Ultimate pressure is no longer attainable
• Oil appears contaminated, milky, or cloudy when viewed through sight glass
• Oil is discolored

Oil Capacity:

• DUO 120 - 13 liter
• DUO 125 - 14 liter
• UNO 250 - 30 liter
• DUO 250 - 23 liter
• DUO 255 - 25 liter

Maintenance Intervals:

Daily:

• Check operating fluid levels
• Check for leaks

As required (at least annually):

• Change operating fluid
• Disassemble casing, sight glass and pumping system and clean casing outside (without cleaning agent)
• Clean gas ballast valve & silencer
• Clean motor fan cap

As required (at least every 2 years):

• Disassemble the pump, clean & exchange seal and wearing parts

As required (at least every 4 years):

• Carry out work in accordance with maintenance and additionally
  • Change vanes
  • Change valves, springs, and sight glass
  • Change silencer nozzle
  • Check coupling and exchange is necessary