Diesel Hammer Mill CF420A22 Specifications

Packing Size ( mm )
Screen Hole Size
22 hp
400~600 kg/h
Diesel Engine
1470*730*1090  mm
1.8–10 mm

Introduction to Hotsale Diesel Hammer Mill

CF420 series hammer mills are our hot sale ones. This CF420 hammer mill is used to reduce the size of wood chips and other suitably sized raw materials to the correct particle size for pelleting or briquetting. It is the most ideal milling equipment for raw materials with sizes of less than 50mm (diameter) including wood pieces, tree branches, bamboo, wood scrap, waste cardboard and newspaper, and agriculture wastes like straw, grass, crop stalk, peanut shell, and so on. The output size can reach a diameter of 3-5 mm, and both coarse and fine grinding can be realized just by adjusting the gap between the hammers and the screen. This hammer mill is the best seller because of its practicality and high efficiency.

Key Features of CF420 Wood Hammer Mill
1. With a workhorse of 22HP, a diesel engine can accept large production work on a daily basis.
2. Both coarse and fine grinding can be realized by adjusting the gap between hammers and the screen
3. The rotor of the hammer mill operates at 3,500 RPM to produce high hammer tip speed, thus the finished powder can be uniform with the least size.
4. The core part of the hammers is made of high-quality carbon alloy steel, which is durable and wear-resistant.
5. Available screen discharge area can be up to 1904 square centimeters which allows for high throughput at a lower horsepower.
6. Equipped with an air blower, the crushed material can be directly collected and transported to the next machine for further processing.
7. You can change the screening sieve according to different material grinding requirements.
8. We can customize the following sieve with a screening hole diameter of 1.8mm-10mm.

Typical Applications of CF420 Diesel Hammer Mill
◆ Wood Pellets& Feed Pellet production
◆ Biomass Briquette production
◎ Hogged wood scrap  ◎ Agro stalks and Straws  ◎ Planer shavings,corn cob,bamboo

hammer mill applications

Structure and Working Principles of Hammer Mill
1. The hammer mill consists of three parts whole: a feed hopper, grinding cell, and winding system.
2. Production flow
The raw material flows into the grinding cell by feeding hopper and then is ground into powder by rotary flake – hammers’ hitting.
The rough powder and fine powder all fly to the screen. Because of centrifugal force and wind force, the fine powder passed through the screen and comes to the product’s container. The rough powder is continuous to be ground till it becomes fine.

Common Breakdowns and Fixing Methods of Wood Hammer Mill

Troubles Reasons Methods
The machine vibrates seriously with loud noises





1. The machine isn’t installed firmly

2. on the ground or the bolt is loose.

Install it firmly
2. The main shaft is bent. Mend or replace the shaft
3. The rotors aren’t in a state of balance.
The weight of the symmetry hammer is not the same.
Adjust them in balance.
4. The flake hammers aren’t in the correct order Adjust the order correctly
5. The bearing is born. Clean and replace the bearings.
Productivity is low


1. The flake hammers are worn seriously. Turn over them and fix them again,
or replace them.
2. The tooth-like plate is worn seriously Replace it.
3. The raw feed is too big. Cut it to small pcs.
The temperature of bearings is over-hot.







1. The raw feed is too wet Dry them firstly
2. The flow of the raw feed is too fast. Control the flow properly
3. The gaps are not correct between
the bearings and bearing bases.
Make them correctly
4. There is dirt in the bearings Clean by petrol.
5. The amount of the lubricating oil
is not suitable.
Control the oil properly
6. speed is too high Use with the suitable motor and pulley
7. the bearing is worn Replace bearing
The feed is out of the wind inlet.




1. The feed flow is too fast or not equal Control feeding speed
2. The voltage and speed of the motor are low Regulate the speed of the motor or
feeding speed
3. The transmit pipe is jammed Dredge the pipe
4. the wind inlet is too big or small Regulate the wind inlet