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The Common Faults and Solutions of Ball Mill (1st)
Apr 17, 2018

As one of the commonly used milling equipment, the ball mill encounters a variety of problems. The following are several types of failures and solutions:


1, The ball mill bear overheats, motor overloads

Cause of failures:

1) The lubricating oil number is inconsistent with the equipment specification, or the lubricating oil has deteriorated;

2) Too much or too little grease;

3) The lubrication line is blocked, causing the lubricating oil not to enter the lubrication point;

4) The bearing or coupling is not installed properly;

5) The clearance between the journal and the bearing bush is too large or too small and the contact is poor;

6) Damage to the oil groove prevents oil from flowing into the journal or bushing.


Solution:ball mill

1) Use the correct lubricant oil number to replace the deteriorating lubricant;

2) According to the provisions to add enough oil, generally 1/3 to 1/2 of the bearing clearance is more appropriate;

3) dredge the lubrication pipeline;

4) Correctly install bearings or couplings;

5) Adjust the gap between the journal and the bearing shell;

6) Check the oil tank in time.


2. There are regular beating sounds in operation and the sound is loud

Cause of failure: 

Some of the liner bolts are not tightened. When the ball mill rotates, the liner strikes the cylinder of the ball mill.


According to the position of the sound, determine the position of the liners of the ball mill and find loose bolts for fastening.


3, After starting of the motor with a reducer, the vibration occurs

 Cause of issue:

1) The two-wheel clearance of the coupling section is too small to compensate for the amount of turbulence caused by its own magnetic center when the motor starts;

2) The gear couplings of the reducer, the motor and the drive shaft do not maintain high coaxially, resulting in the two shafts are not concentric;

3) The coupling bolts of the coupling are not symmetrically tightened, and the fastening force is different;

4) The bearing outer ring is not fixed well.



1) Adjust the wheel gap according to regulations;

2) Make two axes concentric;

3) symmetrically fasten the connecting bolts of the coupling with equal torque;

4) Fix the bearing outer ring. 

motor and reducer of ball mill.jpg

4. Great vibration occurs when the reducer has a mill

 Cause of issue:

1) For the balance shaft of the ball mill and reducer, the axis is not in a straight line;

2) Large ball mills are bulky and heavy, causing the foundation to sink and shift.



1) Re-adjust so that the axis of the mill and the axis of the reducer are on the same plane axis;

2) Set up monitoring subsidence points along the foundation to observe and find that there are subsidences and adjust them.