How To Determine If A Shredder Machine Needs A Major Overhaul?

I. Severe Performance Degradation

Significantly Reduced Processing Efficiency: With unchanged material type and feed rate, output drops by more than 30%, and there is no improvement after ruling out common factors such as blade dulling and screen clogging.

Abnormally High Energy Consumption: Main motor current consistently exceeds the rated value by more than 20%, and even replacing blades and adjusting clearances does not alleviate the problem, indicating a deep-seated issue with the transmission system or bearings.

Frequent Downtime: More than two instances per week of overload, jamming, or automatic reverse operation not caused by foreign objects indicate internal structural instability.

II. Structural Damage to Key Components

Spindle Deformation or Wear: Obvious scratches on the cutter shaft surface, excessive ellipticity, or a feeling of jamming or eccentricity when manually rotating it may require straightening or replacement.

Bearing Housing Wear or Loosening: The bearing housing exhibits a "running" phenomenon (the bearing rotates within the housing), leading to persistently high temperatures and increased vibration; simply replacing the bearing will not solve the problem.

Frame or Tool Box Cracks: After prolonged high-load operation, cracks may appear in the frame welds, or the tool box may deform due to impact, affecting the alignment of the tool shaft and posing a safety hazard.

III. Abnormal Operating Status and Irreparable
Severe Vibration and Abnormal Noise: Even after replacing the blades, tightening bolts, and replenishing lubrication, the equipment may still experience a "clunking" impact sound or machine resonance, indicating dynamic balance failure or loose foundation.

Sealing System Failure: Frequent lubricating oil leaks and large amounts of dust entering the bearing housing, recurring shortly after cleaning, indicate aging seals or severe wear on mating surfaces.

Hydraulic or Intelligent System Malfunction (if equipped): Weak material feeding, unstable pressure, or sluggish PLC control system response and sensor false alarms affect automated operation.

IV. Reaching the Recommended Overhaul Cycle:
Judging by Operating Length: Most manufacturers recommend a comprehensive overhaul every 15,000 hours of operation or 3 years, including spindle calibration, ultrasonic testing, and gearbox disassembly inspection. Assessment based on maintenance records: If wear parts such as blades, bearings, and belts have been replaced multiple times, and the repair cost is close to 40%–50% of the new machine price, a major overhaul should be prioritized over a minor repair.

V. Assessment Recommendations Before Major Overhaul

Establish equipment health records: Make a comprehensive judgment based on data such as daily inspection records, failure frequency, and lubrication analysis reports.

Contact the manufacturer or professional service provider: Conduct professional diagnosis through vibration analysis, oil testing, infrared thermal imaging, etc., to avoid blindly disassembling the machine.