I Abnormal noise in the machine.

Causes

1. Foreign matters entering.

2. Fixing screws of the hammer blades are loose.

3. The toothed ring or stream splitting cover is loose.

4.There is collision between the grading impeller and convex shape cover.

Solutions

1. Open the operation gate or grading system and remove impurities.

2. Fasten the fixing screws.

3. Check for that the clearance between the impeller and its surroundings is 1.5 mm.

II Abnormal noise, vibration or overheat of bearings

Causes

1. Foreign matters exist in the bearing chamber.

2. Damaged bearings

3. Deformed main shaft

Solutions

1. Dismount it and clean and dry it.

2. Replace the bearings. 

3. Find out the causes and replace the main shaft. 

III Decreased production capacity

Causes

1. Mash adheres to the toothed ring or grading impeller. 

2. The hammer blades or geared ring are worn.

3. Reduced air volume.

Solutions

1. Remove foresight matters adhering on to the toothed ring or grading impeller. 

2. Replace the hammer blades and toothed ring. 

3. Check the fan, filter bags of the dust collector, and adjust the air volume.

IV Uneven ground particle size, and averagely increased particle size.

Causes

1. The toothed ring or hammer blades are worn, and the clearance increases.

2. The blades of the grading impeller are worn.

3. The blades of the grading impeller are adhered by mash.

4. Pipeline air leakage and unstable air volume.

Solutions

1. Replace the toothed ring and  hammer blades. 

2. Replace grading impeller. 

3. Clear the mash adhering on to the blades of the grading impeller.

4. Check the pipeline and seal it.

V Violently increased noise and vibration

Causes

1. The grinding disc losses its dynamic balance.

2. Mash adheres to the toothed ring. 

3. Damaged bearings.

4. Too loose triangular belts

Solutions

1. Check and rectify the dynamic balance.

2. Remove mash adhesion on the geared ring. 

3. Replace the bearings. 

4. Tighten the triangular belts.

VI Current overload

Causes

1. Too high feeding rate

2. Increased adhesion in the grinding chamber 

3. Clogged materials 

Solutions

1. Lower the feeding rate.

2. Remove thoroughly adhesive substance.

3. Properly increase suctioned air volume.

VII The motor can’t be started up.

Causes

1. Damaged motor 

2. Circuit trouble.

Solutions

1. Replace the motor. 

2. Remove circuit trouble.