Sealless Magnetic Drive Pump Service & Troubleshooting
Our Commitment
We know how crucial it is for you to stay operational - that's why you can reach us around the clock - 24/7.
Phone: (281) 999-1182
Toll Free: 1-800 4-SEALEX
To achieve your goal - we provide on-site training of operators and maintenance personnel, as well as start-up assistance and field trouble shooting. Our Houston Service Center contains a complete in-house repair & fabrication facility, and is backed up by our extensive inventory of replacement parts and components.
Trouble Shooting Mag Drive Pumps
Use the list below to identify the problem and find a possible solution. This list can
also be downloaded as PDF here.
| Symptom/Problem | Reference Code to Possible Cause & Elimination |
|---|---|
| Flow rate too low | 1, 8, 9, 12, 14, 15 |
| Flow rate too high | 2, 16 |
| Delivery head too low | 2, 3, 5, 8, 9, 10, 12, 15 |
| Delivery head too high | 1, 16, 33 |
| Pump does not deliver any flow | 3, 4, 5, 6, 8, 15 |
| Pumped flow pulsates | 3, 5, 8 |
| Pump operates noisily | 3, 5, 6, 7, 12, 13 |
| Power reading too high | 2, 6, 7, 10, 11, 13, 16 |
| Power reading too low | 9, 15, 32, 33 |
| Pump/motor rotates reverse | 18 |
| Pump does not operate smoothly | 7, 13, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 |
| Pump casing leaks | 28, 30, 31 |
| Pump overheats | 4, 15, 17 |
| Pump seized | 6, 7, 13 |
| Code | Cause | Elimination |
|---|---|---|
| 1 | Resistance in discharge piping is too high. | Clean or modify discharge piping or valves accordingly. Check the size of the discharge piping, and increase size of piping if necessary. |
| 2 | Resistance in discharge piping is too low. | Use control valve or orifice on discharge side to throttle. |
| 3 | Suction pressure is too low. | Increase suction pressure by raising liquid level or pressure level in suction tank. |
| 4 | Valve on suction or discharge side closed. | Open the valve. If applicable, verify check valves operate properly. |
| 5 | Suction piping not vented properly or contains entrained gas. | Vent the system prior to start-up. Check design and arrangement of suction piping. |
| 6 | Foreign objects inside the pump. | Disassemble and clean the pump. Replace damaged components using new original spare parts. |
| 7 | Wear of journal bearings. | Check the bearing clearances. Replace if necessary using new, original spare parts. |
| 8 | Leak in suction piping. | Check gaskets and flange connections of suction piping and verify torque values of flange bolts. Replace leaking gaskets with new gaskets and re-torque flange bolts using appropriate torque values. |
| 9 | Rotating speed is too low. | Check frequency and voltage of the electric motor. |
| 10 | Viscosity of the pumped liquid is too high. | Contact KLAUS UNION. |
| 11 | Density of the pumped liquid is too high. | Contact KLAUS UNION. |
| 12 | Pump/motor rotates in reverse. | Check the motor's direction of rotation prior to start-up (observe direction-of-rotation arrow on the pump). |
| 13 | Anti-friction bearings are damaged. | Replace anti-friction bearings and clean the oil chamber. Verify usage of appropriate lubricant. |
| 14 | Plugged suction piping. | Clean suction piping from deposits and debris. Clean plugged valves and filters. If necessary, replace suction piping. |
| 15 | Magnetic coupling de-coupled. | Shut down electric motor. As soon as the motor comes to a stand still, start it up again. In case of repeated de-coupling contact KLAUS UNION. |
| 16 | Rotating Speed is too high. | Check the frequency and the voltage of the electric motor. |
| 17 | Internal flush flow is too low. | Check the flushing system. Clean the components if necessary. Check if pump operates in admissible range. |
| 18 | Check valve seized. | Verify check valve operates properly. Replace if necessary. |
| 19 | Impeller clogged or damaged. | Clean the impeller or replace it if necessary, using new and original spare parts. |
| 20 | The pumped liquid starts to solidify. | Increase temperature of the pumped liquid. Check for proper insulation of piping and pump. Consider heating the pump - Contact KLAUS UNION. |
| 21 | Oil level in drive frame incorrect. | Check for leaks and repair as necessary. Check anti-friction bearings and replace if necessary, using new original spare parts. Verify correct oil level in drive frame and inspect gauge for cleanliness |
| 22 | Improper lubricant for anti-friction bearings. | Check anti-friction bearings and replace if necessary, using new original spare parts. Verify the lubricant meets required specifications.. |
| 23 | Improper assembly of anti-friction bearings. | Check anti-friction bearings and replace them if necessary, using new original spare parts. Verify proper assembly of anti-friction bearings. |
| 24 | Misaligned or loose flexible coupling. | Verify proper alignment of flexible coupling. Observe assembling and alignment instruction in operating manual for the flexible coupling. |
| 25 | Flexible coupling is worn. | Replace worn/damaged components of the flexible coupling, using new original spare parts. Follow instructions in coupling manual to ensure proper assembly and alignment. |
| 26 | Poor quality/condition of foundation. | Check and correct the construction of the foundation. |
| 27 | Base plate not rigid enough for foundation-less execution. | Contact KLAUS UNION. |
| 28 | Pump casing distorted. | Check and correct suction and discharge piping to not exceed admissible forces and moments. |
| 29 | Misapplied pump design. | Contact KLAUS UNION. |
| 30 | Improper case gasket material. | Replace existing case gasket with correct gasket material, using new and original spare part. |
| 31 | Casing stud nuts tightened insufficiently. | Tighten casing stud nuts using required torque rating. |
| 32 | Density of pumped liquid is too low. | Contact KLAUS UNION. |
| 33 | Viscosity of pumped liquid is too low. | Contact KLAUS UNION. |