- Misalignment Between Motor → Clutch → Pinion
Symptoms: Knocking, cyclic vibration, metallic clatter.
What to check:
Coupling alignment (horizontal, vertical, angular).
Condition of mounting bolts.
- Worn or Damaged Friction Plates (for Air or Dry Clutches)
Symptoms: Screeching, grinding, uneven engagement.
Check:
Thickness of friction pads.
Heat marks, glazing, cracking.
3.Low or Unstable Air Pressure (on Air Clutches)
Symptoms: “Chattering” engagement, pulsing noise.
Check:
Air pressure supply (usually 6–8 bar depending on design).
Leaking hoses or fittings.
Solenoid valve function.
- Loose Clutch Springs or Damaged Drive Pins
Symptoms: Rattling sound, especially at low RPM.
Check:
Spring tension.
Wear on drive pins or bushings.
Missing fasteners.
