It is important to stop the vibration to maintain the normal life of the machine. An unbalanced rotor can cause the machine to jump or shake and severe shaking can cause cracking in the hood and hood welds. Check the following to determine the cause:
1.  Inspect rotors for missing, broken and uneven wear of knives. If one knife assembly is replaced with a new one, the closest knife on the opposite side (180 degrees) of the rotor must also be replaced with a new one to maintain rotor balance.
2.  Inspect the end area of the rotors for missing weights – look for a partial weld where a block or bolt with washers would have been welded on.
3.  Inspect for a bent rotor by looking for bent knife mounting bars. A wobbling pulley on the rotor is also an indication of a bent rotor.
To keep the shredder in optimum operating condition, refer to the maintenance section of the operator’s manual for:
1.  Drive belt tension and pulley alignment and adjustment instructions.
2.  Gearbox oil level and recommended type of lubricant.
3.  Daily and periodic lubrication requirements.
4.  Tire inflation pressure – Maintain equal pressure in all tires. Minimum 10 psi – Maximum 20 psi.
5.  Cutting height adjustment – Recommended 2” minimum ground clearance of flail knives.