Working principle of hydraulic hammer


There are 2 types of breakers on the market:


2 breaker types

How it works (ACCUMULATOR TYPE):

a) The breaker consists of four main sections: cylinder, control valve, front head, and head cap.
b) The cylinder contains a moving piston which strikes the chisel.
c) Four through bolts are assembled to hold the cylinder and head cap together with the front head.
d) A control valve is assembled to the cylinder and regulates the piston movement.
e) Accumulator compensates for working oil flow in the hydraulic circuit and prevents pulsation.
f) Chisel pins inside the front head prevent the chisel from coming out.


Animated working principle:

Working principle of hydraulic breaker



1. Piston rises
When the high pressure enters, the chamber is ① faced with the lower side of the piston ⑧which changes the direction of flow. Then, the chamber works together with the low-pressure circuit ② to reverse the piston movement. The force applied to the lower side becomes greater than that of the upper side. Gradually the piston goes upward. The piston compresses the gas sealed in the gas chamber.

2. Valve rises
As the piston rises, the oil flows into chamber ② & ⑥. As a result, the valve starts rising because of the difference in area between the upper and lower faces of the valve.

3. Piston descent
When the valve rises and is connected with ⑧, the high pressure enters into chamber ④ for piston reversion, and the piston starts descending due to the difference in area between the upper and lower faces receiving the same pressure. As the piston comes down, its descending speed is accelerated by the pressure of the gas in the gas chamber.

4. Impact
The accelerated piston strikes chisel. While descending of the piston, the middle of the portion of piston reaches chamber ② and then the pressure in chamber ⑥ supporting the valve becomes less and the oil goes through into chamber ②, ③ to be changed into the low pressure. At the same time, chamber ⑧ remains always high pressure. The valve, therefore, lowers.

5. Continuous striking
Upon completion of the valve descending process, the state shown in the first section of the figure is created to allow continuous striking with the chisel.


Why you need a hydraulic breaker

Hydraulic breakers are designed to work in quarries, various construction sites, such as building disassembly, breaking up roads, housing land development, sewage system and so on. The chisel selection is dependent on working material in accordance with chisel appearance. Generally, the blunt type is for granite or gneiss, excessive hard rock and not splitting work. And moil or wedge is for sandstone and weak metamorphic rock into which chisel penetrates or on especially hard rocks or reinforced concrete. The wedge point is used for civil engineering works and breaking fiat rocks.

A serial number of breaker is important.

The breaker serial number stamped on the main body is important for repairing or ordering spare parts.
All products are made very preciously under stern quality control when the products run out of order, the number must be presented to our shop to maintain or repair them. 
Therefore, you have to keep in memory the serial number for a specific breaker, which usually locates in the main body center or side of the breaker.


You can be injured if you do not wear proper clothing. Loose clothing can get caught in a machine.
Wear protective clothing to suit the job. For example, you have to wear a safety helmet, safety shoes, safety glasses, well-fitting overalls, ear-protectors, industrial gloves, and breathing protector.
Please, do not wear a necktie or scarf and keep long hair restrained.

Lifting equipment

Improper lifting equipment can cause you injury. You should know how to use lifting equipment and the equipment should be strong enough for your job. Make sure that lifting equipment is in good condition, suitable for the job and complies with all local regulations and relevant laws.


You should be a skilled operator of the carrier machine to use the breaker correctly. Do not use or install the breaker until you can drive the carrier machine. Please do not rush learning the job, take your time and learn carefully.

Hydraulic system

The impact energy of the breaker is constant and independent of the carrier's hydraulic system.
Although you stop the excavator, the rest of the oil pressure is still getting into the breaker and operates the breaker. Hydraulic fluid at the system is dangerous. Before disconnecting or connecting hydraulic hoses, stop the carrier engine and release pressure trapped in the hoses, gas chamber. Do not touch the hot parts. And if the system contains accumulator, depressurize system before maintenance. When leaving equipment please put the equipment lowered and engine off.

Equipment limits and condition

Never operate the equipment beyond its limits, If you do, it can cause damage, and also be dangerous. And do not try to upgrade the breaker's performance by unapproved modifications.
A defective breaker can injure you or others. Do not operate equipment which is defective or has missing parts. Make sure all maintenance procedures are completed before use.
And obey all laws and regulations of the workplace and equipment. Please do not operate at abnormally high temperatures and use only the completely assembled breakers.


There are 4 types of working tool (chisel)

Moil point

Multipurpose applications, including the breaking of extra hard rock, hard stone, and reinforced concrete, as well as excavation of bedrock, etc.

Wedge point

Concrete breaking, excavation of bedrock, operation on the face of the slope, excavation of ditches, etc.

Blunt chisel

Secondary breaking in quarries, boulder breaking, concrete breaking, and slab breaking, etc.

Conical point

Multipurpose applications, including the breaking of extra hard rock, hard stone, and reinforced concrete, as well as excavation of bedrock, etc.

Lubrication of the chisel (greasing)

Insufficient lubrication to the chisel causes the short life of the front cover, chisel pins, and chisel.
At the end of every 2 hours of actual operation, lubricate the chisel with the following amount of grease using a grease gun.
Before greasing, firmly press chisel into the front head. When the breaker is equipped with a new chisel, apply grease first and then mount chisel.
As an option, you can install the Autolube system for the hydraulic breaker. Learn more about the auto greasing pump.