How to Adjust Hydraulic Breaker for Mini Excavator

Before starting the base machine which the hydraulic breaker is mounted, check to use the machine safely and to prevent any trouble. Operation includes the following:

Cylinder Adjuster

The hydraulic breaker is designed so that the bpm (blows per minute) can be adjusted with the operating pressure and oil consumption kept constant by changing the piston stroke, enabling the hydraulic breaker to be used widely.
However, when the bpm is increased, the impact force will decrease. Therefore the bpm must be adjusted in accordance with job conditions.

The cylinder adjuster is installed to the right side of the cylinder. When the cylinder adjuster is tightened fully, the piston stroke become maximum and the impact blows (bpm) becomes the minimum.

The other way, when the adjuster is loosened about two turns, the piston stroke becomes the minimum and the impact blows (bpm) becomes the maximum.

The cylinder adjuster is fully tightened when the breaker is delivered.
Even the adjuster is loosened over two turns, the impact blows does not increase.

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Valve Adjuster

The valve adjuster is installed on the valve housing. The impact blows and the oil consumption increase when the adjuster is opened and when it is closed, the impact blows and the oil consumption decrease.

When the oil flow from the base machine is lower or when the hydraulic breaker has been installed on large base machine, the valve adjuster can control the amount of oil flow artificially.

The hydraulic breaker do not operate if the valve adjuster is fully closed.

Adjusting items	Procedure	Oil flow rate	Operating pressure	Bpm	Impact power	At delivery
Cylinderadjuster	Open Closed	No change No change	No change No change	Increase Decrease	Decrease Increase	Full closed
Valve adjuster	Open Closed	Increase decrease	Decrease Increase	Increase Decrease	Decrease Increase	2-1/2Turn out
Chargingpressure in back head	Increase decrease	Decrease Increase	Increase Decrease	Decrease Increase	Increase Decrease	Specified

Installation of Hydraulic Breaker

Set the hydraulic breaker horizontally on wood blocks so that the accumulator may be upper side.
Remove the rubber plug or spring pin ① and the stop pin ② into front head from opposite sides by using a hammer and a press pin. (Press pin is stored in toolbox)
Lift up the tool pins ③ after inserting the press pin into the hole of tool pin from bottom side, and remove the tool pins from the front head.
Insert the tool into the front head.
Insert the tool pins, and then assemble the stop pin and rubber plug or spring pin in the front head.
Using a hammer and a press pin, fasten the rubber plug or spring pin into the front head.

Notice:

Before tapping the stop pin, make sure that there is no person where they come out.
After the rubber plug or spring pin ① is removed and installed 2 or 3-times, the rubber plug ① by new ones.
Apply the grease on the surface of the shank area and impact area of tool.

Precautions for Inspection & maintenance

Inspection: Check the base machine and the hydraulic breaker to use safely and to prevent any trouble before operation.
Warming up the machine: Especially in winter or cold area, warm up the base machine first before the breaker operation.
Safety Maintenance: Before starting the work, examine the geological and geographical features of work site and be careful of the ground crack or building collapse.

Cautions, when driving or stopping base machine

Driving: Carry out driving while the hydraulic breaker is kept horizontally with ground and is 40 to 50cm above ground.
Cautions on slope driving: When driving down on the slope, decrease the engine rpm and keep the angles with boom and arm 90o to 110 o.
Stopping: When the machine is stopped, the hydraulic breaker stand vertically and set the tool end on the ground.

Precautions for Safety Operation

Stop working the hydraulic breaker, if hydraulic hoses vibrate excessively.
Check the N2 gas pressure into the accumulator & back head of hydraulic breaker.
Stop the hydraulic breaker operation as soon as the object is broken. If operation continued, idle blows could result in excessive wear of major components or parts damaged such as inner bush or piston.
Do not use the hydraulic breaker to move rocks with end of tool or with hydraulic breaker body.
Do not use tool as lever.
The hydraulic breaker could be damaged through bolt, tool, front head, inner bush and front cover.
Move the impact point of the object, if the object does not break within 30 seconds.
Do not use hydraulic breaker in water. Corrosion of hydraulic breaker, or non-lubrication, could result in further damage of the hydraulic components.
An underwater kit must be installed when hydraulic breaker for working in water.
Please contact our dealer, if you need.
Do not use hydraulic breaker as hammering. Because of hydraulic breaker is much heavier than excavator bucket, such usage could result in damage to the front head or swing mechanism of the base machine.
Do not operate hydraulic breaker with boom or arm cylinders fully extended (bottomed out).
This may result in hydraulic breaker shock, and damage to the base machine.
Maintain 100mm cylinder stroke of base machine at least.
Do not curl the tool tip into arm or boom of base machine when traveling or parking carrier.
Do not strike in one spot for more than 30 seconds.
If the object does not break, stop breaking after then change the spot of object.
Working too long in one spot will create excessive stone dust under tool. Dust dampens impact effect, and can damage the piston seal.
Never use a hydraulic breaker as a transporter. This could result in tipping carriers or damaging on-base machine.
Operate the hydraulic breaker only to the front and rear of base machine.
Do not use hydraulic breaker at either side of base machine.
This may result in tipping excavator, or in damaging carrier swing device.

JIANGTU Attachments, as a breaker manufacturer for 12 years. We could provide various types of hydraulic hammer breakers and the chisel selection recommendation and installation instructions for you. If you have any questions, please feel free to contact us.

JIANGTU Excavator Break adopts special carbon steel material and heat treatment processes to ensure that the wear of the piston hitting surface is minimized and the service life of the piston is maximized.

Piston production adopts precise tolerance control to ensure that the piston and cylinder can be replaced with a single product, reducing maintenance costs.

The shell of the breaker has put forward higher and higher requirements for its sealing system. The NOK brand oil seals ensure our hydraulic breaker has low (zero) leakage, low friction and wear, and long service life.

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