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.
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