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Maintenance & Troubleshooting

Shredder Reducer Maintenance

The reducer is a critical component in shredders, and proper maintenance is essential to ensure its long-term performance. The following guidelines are provided to help you maintain your shredder reducer in a professional manner:

  • Lubricant: The reducer should use VG320 (ISO viscosity grade) lubricant. Do not use improper, inferior, or impure lubricants. The lubricant should be replaced every 5,000 hours or once a year, whichever comes first.

  • Working Environment Temperature: The working environment temperature of the reducer should not exceed 40°C. If the ambient temperature is below 0°C, the lubricant must be heated above 0°C before starting, or anti-freeze lubricant oil should be used. It is also best to run the reducer without load for more than 10 minutes before starting.

  • Installation and Disassembly: Do not hit any part of the reducer with a heavy hammer when installing or disassembling the reducer.

  • Pre-Start Inspection: Before starting the machine, check the lubricating oil level and make sure that the rotation is flexible.

Bearing Maintenance

  • Lubrication: Use No. 2 lithium-based grease to lubricate the bearing. Do not use improper, inferior, or impure lubricants. The grease should be replaced when it becomes dirty, dry, or ageing.

  • Grease Filling Amount: The filling amount of grease is generally 1/2 to 1/3 of the bearing cavity space. Grease must be added after 1000 hours of operation. Grease is injected into the bearing from the grease nipple.

  • Bearing Replacement: Bearings generally do not need to be replaced. However, if the bearing heats up and the noise is too loud, it may be necessary to replace the bearing with lubricating oil. Before changing the lubricating oil, use a bearing cleaner such as petroleum ether to clean the bearing dirt. After cleaning, lubricant should be applied immediately to prevent corrosion. The disassembly and replacement of the main bearing must be completed by professionals.



  • Ensure that the power of the machine is turned off and the fuse is taken out before troubleshooting.

  • Hang up a maintenance signboard to warn others not to operate the machine.

  • Use a tested instrumentation device. The ammeter should be capable of measuring AC and DC currents twice that of the machine, and the voltmeter should be capable of measuring the resistivity of 5000 ohms/volt on AC current and 20,000 ohms/volt on DC current.

  • If needed, a VOM or VTVM meter can be added to help with detection.


  • Before replacing the original circuit components, it is recommended that the user conduct a detailed inspection according to the circuit diagram.

  • If the troubleshooting of the circuit is not clear, it is easy to burn the newly installed original, resulting in waste.


  • Once a machine failure is found, it should be checked in time and replaced according to the appendix of the manual.


Possible Cause



Machine Does not Work

  1. The power supply voltage is wrong or the voltage is too low

  2. Broken wire, connector and terminal fall off

  3. The emergency stop button is off

  4. The main power supply is not connected

  5. The thermal relay is disconnected due to overload

  6. The overload protection current setting is too small

  1. Check whether the voltage is normal,

  2. Repair the broken wire, connect the terminal connectors correctly

  3. Turn on the emergency stop button

  4. Check whether the main power is connected

  5. Reset the thermal relay

  6. Reset the overload current value


Tool wears out too quickly

  1. The tool is unproper

  2. There are too many hard objects in the feeding

  3. The feeding material is not suitable for the shredder

  1. ​Replace with the proper tool

  2. Remove hard objects from feeding

  3. Use right machine


Abnormal sound

  1. Check if metal was accidentally thrown into the hopper.

  2. Check if the bearing is damaged.

  3. The moving knife is hitting the fixed knife plate.

  4. The parts are loose and making abnormal noise.

  1. Stop the machine and remove hard metal objects from the hopper.

  2. Stop the machine and replace the damaged bearing.

  3. Adjust the distance between the moving knife and the fixed knife plate.

  4. Adjust the loose parts and re-lock them in place.​

Note: The above are common faults. However, the failure situation may vary depending on the actual use environment and processing materials. If you encounter any problems or failures in the actual process, please consult us

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