Repair - ProMinent ProMus Series Operating Instructions Manual

ProMinent
Maintenance / Repair/ Troubleshooting
17. Slowly apply back pressure on the process side of the pump until the pump is in full internal
relief. (Gushing/Pulsing oil will be visible in the Relief/Air Bleed Observation Port when the
pump is in full internal relief)
Note: Allow the pump to relieve until the air is purged from the hydraulic system.
18. Gradually turn down the adjusting screw counting the number of turns until the recorded
value in step 4 above.
19. Slowly increase the pressure until the system pressure is reached.
20. To test the internal relief, slowly increase the system pressure until 10% greater than the
value listed in the Ident code. It may not be possible to reach this pressure if the pump is in
internal relief. If this condition exists, slowly rotate the adjusting screw clockwise until the
set pressure is reached and the pump is still relieving. If the pump is not in relief at the 10%
greater than value listed in the Ident code rotate the adjusting screw counterclockwise until
the pump goes into relief and the desired set pressure is maintained.

11. Repair

WARNING
• Pumps and peripherals are to be maintained and repaired by trained and authorised
personnel only!
• Always depressurise the suction and discharge tubing before working on the pump!
• Always empty and rinse the liquid end before maintenance and repair work, if used with
hazardous or unknown materials!
• When working on the liquid end, wear appropriate protective equipment when metering
hazardous or unknown liquids!
• Before working on the motor, switch off and protect from unauthorised reconnection!
If external fan, stroke position motor or speed controller switch off also!
Check that motor is voltage free!
IMPORTANT
Each time the liquid end is removed and the diaphragm is changed re torque the liquid end bolts
in a crosswise fashion to the value listed in Section 10 maintenance tasks
Rebuilding Inlet and outlet Check Valves
Clean and rebuild inlet and outlet check valves one at a time.
Refer to liquid end parts list for diagram and parts for rebuilding check valves (section 14)
• Disassemble valve
• Replace worn parts
• Clean the remaining parts
• Assemble the valve.
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