I Motor unable to be started

Cause

1. Circuit problem

2.Malfunction of the safety switch of the access door

Solution

1. Check and repair the wiring

2. Check and repair or replace the safety switch

II Motor hard to be started

Cause

1. Too low voltage

2.Too small section area of the wires

3. Too small starting compensator

4. Fuse liable to burn out.

Solution

1. Avoid the power consumption peak and re-start

2. Replace with appropriate wires

3. Replace with a bigger compensator

4. Replace with a new fuse mating the motor load

III Motor overheated and not powerful

Cause

1. Motor running in two phases

2. Short circuit of motor coil

3. Long-term overloading

Solution

1.Connect another phase, keep running in 3 phases

2. Repair the motor

3. Running under rated load

IV Hammer mill vibrating violently.

Cause

1. Improper hammer arraying

2.Excessive difference between the weight of the two hammer groups

3. One or two hammers are jammed,  or not sensitive to be thrown apart

4.Other parts on the rotor not in balance

5. Main shaft bended

6. Bearings worn

7. Hammer’s pin-shafts worn off.

8. No gap between the two halves of coupling

9. Coupling parts not concentric

10. Anchor bolts not strong enough

Solution

1. Install them according to the hammer arraying plan

2. When replacing hammers, keep the weight difference within 2 g.

3. Free the hammers

4.Balance the rotor

5.Straighten the shaft or replace with a new one

6. Replace the bearings

7. Renew all the pin-shafts

8. Adjust the gap to 3-5 mm

9. Re-adjust, keep the level difference within 0.2mm, and non-concentricity<1°

10、Reinforce the anchor bolts

V Abnormal noise from inside of the hammer mill

Cause

1.Iron impurities or stones inside the machine

2. Inner component parts come off or broken

3. Too little gap between hammers and screen

4. Offset rotor

Solution

1.Stop machine to remove rigid foreign matters

2. Stop to check up, replace the parts

3. Keep a proper gap

4. Check and adjust

VI Lower productivity

Cause

1. Insufficient power of motor

2. Hammers worn severely

3. Material fed unevenly

4. High moisture in raw materials

5. Wrong screen used

6. Blocked dust filter bags of the air assist system

7. Low percentage of the opened screen area

Solution

1. Check and repair the motor

2. Shift the hammer tips or replace with new hammers

3. Make the feeding even

4. Dry raw materials

5. Replace the screen

6. Clean or replace the filter bags

7. Choose a screen with a high opening rate

VII Material regurgitation from inlet

Cause

1. Blocked conveying pipe

2. Blocked screen holes

3. Position of the guiding plate not in accordance with the rotation direction of rotor

Solution

1. Eliminate the blockage

2. Dredge the screen holes or replace with a new screen

3.Shift the guiding plate position or change the motor running direction

VIII Too coarse mash product

Cause

1. Screen worn severely or broken

2.Screen improperly fitting with its supporting frame or too big side gap

Solution

1. Repair or replace the screen

2. Stop to check and repair, tighten the screen on to the frame

IX Overheat of bearings

Cause

1. The centers of main shaft and motor are not concentric with each other

2. Too much or too little or poor lubricant

3. Damaged bearings

4.Bended main shaft or unbalanced rotor

5. Long-term overloaded operation

6. Wrong lubricant No.

Solution

1.Adjust the motor to make it concentric with the main shaft

2.Change the lubricant and refill it as per regulations

3. Renew the bearings

4.Straighten the main shaft and balance the rotor

5. Reduce feeding amount

6. Reselect the Molybdenum Disulfide Lithium-based Grease