Troubleshooting Power-Lock
Locking Device
| 1 | Slip occurs below the specified transmission torque value (shaft hub bore) |
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| Cause 1 | The shaft diameter or hub bore diameter is out of tolerance | Solution | Remachine the shaft diameter or boss diameter to within the recommended tolerance. |
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| Cause 2 | The surface roughness of the shaft or hub bore is rougher than the recommended value. | Solution | Please reprocess to the appropriate surface roughness. |
| Cause 3 | outer hub diameter is small and is deformed. | Solution | Change the boss material or increase outer hub diameter. |
| 2 | Slip occurs below the specified transmission torque (tightening bolt) |
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| Cause 1 | The tightening torque is less than the standard bolt tightening torque. | Solution | Use a torque wrench to tighten the bolts |
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| Cause 2 | Damage to the thread surface has reduced the tightening efficiency of the screw. | Solution | Replace the tightening bolts. |
| 3 | Slip occurs below the specified transmission torque value (machine side) |
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| Cause 1 | Torque greater than Power-Lock 's transmission torque is being applied | Solution | Recheck the torque on the machine and use a larger size or multiple pieces. |
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| Cause 2 | Large thrust load | Solution | Calculate the combined load and check that it is less than the transmission torque. |
| Cause 3 | A large shock torque is applied | Solution | Please consider using a larger size or multiple pieces for a greater safety factor. |
| 4 | Slip occurs below the specified transmission torque value (others) |
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| Cause 1 | There is a large temperature difference between the shaft and the boss | Solution | Use a cooling device to equalize the temperature of the shaft boss. |
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| Cause 2 | Used at high temperatures, the linear expansion coefficients of the shaft material and boss material are significantly different | Solution | Please change the materials of the boss and shaft or install a cooling device. |
| Cause 3 | No oil or grease was applied during assembly. (ML and SL series, stainless steel, electroless nickel plating specifications are not required) | Solution | When assembling, apply oil or grease to the contact surfaces of the shaft and boss, the contact surfaces between parts such as the inner and outer rings, and the seat and thread surfaces of the tightening bolts. |
| Cause 4 | Use oil or grease containing molybdenum-based anti-friction agents | Solution | Do not use as it will change the coefficient of friction |
| 5 | broken bolt |
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| Cause 1 | Bolts overtightened | Solution | Use a torque wrench to tighten the bolts |
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| Cause 2 | Use of bolts other than the dedicated tightening bolts | Solution | Be sure to use the dedicated tightening bolts. |
| Cause 3 | Fatigue failure due to repeated load fluctuations (the fracture surface has a shell-like pattern) | Solution | Replace the bolts and reduce repeated bending moments or radial loads as much as possible. |
| Cause 4 | Brittle fracture (used in acidic or chemical environments) | Solution | Please measure the atmospheric pH value and contact us. |
| Cause 5 | Ambient temperature exceeds 200°C | Solution | Reduce the ambient temperature to 200°C or less. |
| 6 | Power-Lock does not fit into the shaft or hub bore. |
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| Cause 1 | Shaft diameter and hub bore diameter dimensions are outside the tolerance | Solution | Please remachine the shaft diameter and hub bore within the recommended tolerances. |
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| Cause 2 | Wrong model number for Power-Lock | Solution | Replace Power-Lock |
| 7 | The bolt does not go into the extraction tap smoothly |
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| Cause 1 | Damage to tapped holes | Solution | Replace Power-Lock |
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| Cause 2 | Damage to the bolt threads | Solution | Replace the bolt |
