Ruhrpumpen CPP21 - User Manual

Questions and Answers

S
seanlarsonAug 11, 2025
Why are the bearings on my Ruhrpumpen CPP21 Water Pump getting so hot?
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  Daniel BellAug 11, 2025
  Hot bearings in your Ruhrpumpen Water Pump can stem from several issues. It could be due to insufficient, contaminated, or too much oil. Other potential causes include misalignment, tension stress on the pump, excessive axial thrust, incorrect half-coupling spacing, or damaged bearings. To resolve this, add oil if it is insufficient, drain and clean the reservoir and refill with clean oil if contaminated, check pump and driver alignment, drain to the proper level if there's too much oil, check piping for tension-free connections, clean balance holes in the impeller and change the seal rings for excessive axial thrust, reset the half-coupling spacing if it's not set correctly, or replace damaged bearings.
M
Melanie TranAug 28, 2025
Why is my Ruhrpumpen CPP21 Water Pump driver overloading?
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  Tracy ReynoldsAug 29, 2025
  Driver overload in a Ruhrpumpen Water Pump can occur due to several reasons: the density or viscosity of the pumped fluid not matching the design, excessive speed, misalignment of the pump unit, tension on the pump, incorrect motor voltage, the motor running in two-phase mode, damaged bearings, or the system head being lower than the rating. To resolve this, you may need to consult a Ruhrpumpen dealer regarding fluid properties, decrease the driver speed, realign the pump, check the piping for tension-free connections, apply the correct voltage to the motor, check the cables, connections, and fuses, replace damaged bearings, or check the suction and discharge pressure and set the operating point with the discharge valve.
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kenneth21Sep 4, 2025
How to fix a leak under the shaft sleeve of a Ruhrpumpen CPP21 Water Pump?
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  Greg JonesSep 4, 2025
  Leakage under the shaft sleeve of your Ruhrpumpen Water Pump can be attributed to a damaged shaft seal, improper alignment of the pump unit, or an incorrectly set half-coupling spacing. To fix this, replace the damaged seal, realign the pump, or reset the half-coupling spacing to the correct setting.
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Jacqueline TurnerNov 16, 2025
What to do if my Ruhrpumpen CPP21 Water Pump is not pumping water?
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  Taylor WallNov 16, 2025
  If your Ruhrpumpen Water Pump isn't delivering liquid, several factors could be at play. It might be due to worn inner pump parts, incorrect density or viscosity of the pumped fluid, incorrect motor voltage, the motor running in two-phase mode, the pump not being primed, low speed, a plugged feed pipe or impeller, a clogged suction, a damaged impeller, wrong rotation, improper venting of the pump or piping, air pockets in the piping, the system's counter pressure exceeding the pump's design point, or insufficient NPSHa. You can try changing worn parts, consulting a Ruhrpumpen dealer for fluid issues, applying the correct voltage to the motor, checking cables/connections/fuses, priming the pump, checking driver input for speed, cleaning the pipe and impeller or suction line, replacing the i...
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lroseNov 21, 2025
Why is the water pressure low on my Ruhrpumpen CPP21?
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  John GallowayNov 22, 2025
  Low capacity or discharge pressure in your Ruhrpumpen Water Pump can be caused by several factors: air leaks in the suction line, low speed, clogged suction or impeller, a damaged impeller, wrong rotation, improper venting, plugged feed pipe or impeller, air pockets in the piping, worn inner pump parts, incorrect fluid density or viscosity, incorrect motor voltage, motor connected in two-phase mode, or insufficient NPSHa. To address this, check the suction line for leaks, check the driver and its power source for speed issues, clean out the suction line or impeller, replace the impeller if damaged, check the driver rotation, vent or top up the pump and piping, clean the pipe and impeller, install a vent valve or re-lay the piping, replace worn parts, consult a Ruhrpumpen dealer for fluid i...

Ruhrpumpen CPP21 Specifications

General

Brand	Ruhrpumpen
Model	CPP21
Category	Water Pump
Language	English

Ruhrpumpen CPP21 - User Manual

Table of Contents

Questions and Answers

Ruhrpumpen CPP21 Specifications