HMB Hydraulic Breakers Trouble Shooting and Solution

This guide has been prepared to aid the operator to locate the problem cause and then remedy when trouble has occurred. If trouble has been caused, obtain details as following checkpoints and contact your local service distributor.

Solution1

CheckPoint

 (Cause)

Remedy

1. Spool stroke is insufficient. After stop engine, depress the pedal and check if the spool moves full stroke.

Adjust pedal link and control cable joint.

2. Hose vibration becomes bigger at hydraulic breaker operation. The high-pressure line oil hose vibrates excessively. (Accumulator gas pressure is lowered)The low-pressure line oil hose vibrates excessively. (Backhead gas pressure is lowered)

Recharge with nitrogen gas or check. Recharge with gas. If the accumulator or back head is recharged but gas leaks at once, the diaphragm or charging valve may be damaged.

3. Piston operates but does not strike the tool. (Tool shank is damaged or seizing)

Pull out the tool and check. If the tool is seizing, repair with a grinder or change the tool and/or tool pins.

4. Hydraulic oil is insufficient.

Refill hydraulic oil.

5. Hydraulic oil is deteriorated or contaminated. Hydraulic oil color change to white or no viscous. (white-colored oil contains air bubbles or water.)

Change all hydraulic oil in the hydraulic system of the base machine.

6. Line filter element is clogged.

Wash or replace the filter element.

7. Impact rate increases excessively. (Breakage or maladjustment of valve adjuster or nitrogen gas leakage from the back head. )

Adjust or replace the damaged part and check nitrogen gas pressure in the back head.

8. Impact rate decreases excessively. (Backhead gas pressure is excess.)

Adjust nitrogen gas pressure in the backhead.

9. Base machine meander or weak at traveling. (Base machine pump is the defective improper set of main relief pressure.)

Contact base machine service shop.

 

TROUBLESHOOTING GUIDE

   Symptom Cause Required action
    No blowout Excessive nitrogen gas pressure of the back head
Stop valve(s) closed
Lack of hydraulic oil
Wrong pressure adjustment from relief valve
Faulty hydraulic hose connection
Hydraulic oil in back head infection
Re-adjust nitrogen gas pressure in back head open stop valve
Fill hydraulic oil
Re-adjust setting pressure
Tighten or replace
Replace back head o-ring, or seal retainer seals
    Low impact power Line leakage or blockage
Clogged tank return line filter
Lack of hydraulic oil
Hydraulic oil contamination, or heat deterioration
Poor main pump performance nitrogen gas in back head lower
Low flow rate by misadjustment of valve adjuster
Check linesWash filter, or replace
Fill hydraulic oil
Replace hydraulic oil
Contact authorized service shop
Refill nitrogen gas
Re-adjust valve adjuster
Push down tool by excavator operation
   Irregular impact Low nitrogen gas pressure in accumulator
Bad piston or valve sliding surface
Piston moves down/up to blank blow hammer chamber.
Refill nitrogen gas and check the accumulator.
Replace diaphragm if need
Contact authorized local distributor
Push down tool by excavator operation
   Bad tool movement Tool diameter incorrect
Tool and tool pins would be jammed by tool pins wear
Jammed inner bush and tool
Deformed tool and piston impact area
Replace tool with genuine parts
Smoothen rough surface of tool
Smoothen rough surface of inner bush.
Replace inner bush if need
Replace tool with new
Sudden reduction power and pressure line vibration Gas leakage from the accumulator
Diaphragm damage
Replace diaphragm if need
Oil leakage from front cover Cylinder seal worn Replace seals with new
Gas leakage from back head O-ring and/or gas seal damage Replace related seals with new

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Post time: Aug-18-2022

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