Service
Breaker Troubleshooting Guide
Start from the symptom you see on site. Each guide lists causes in order of likelihood and tells you how to tell them apart.
Most hydraulic breaker faults do not originate in the breaker itself, but in the hydraulic circuit, tool maintenance or operator habit. Correct diagnosis comes before parts replacement: the same symptom can have very different causes, and replacing the wrong part costs both money and a day on site.
These guides are written to help you make that distinction. Under every cause you will find the answer to "is this the one?" — the symptom that separates it from the others. Pick your symptom first, then work through the checks in order.
Numeric values (nitrogen pressure, torque, wear limits) vary by model and are deliberately not published here. For your own model, consult the operating manual or ask our service team.
Choose your symptom
Hydraulic Breaker Not Striking
The breaker does not run at all, the tool does not move, or it strikes only occasionally.
→Breaker Striking Weakly
It strikes but has no power; it will not break the material and the blow sounds thin.
→Breaker Blank Firing
Striking into air after the material has broken — the fastest way to wear a breaker out.
→Breaker Overheating
Oil temperature climbs and the body becomes too hot to touch.
→Breaker Leaking Oil
Oil seeping from the tool area, the body joint or the fittings.
→Hoses Vibrating and Jumping
Hoses vibrate heavily and jump; a pulsation is felt in the circuit.
→Frequently asked
What should I check first when a breaker fails?
Check the circuit, not the parts. Whether the quick couplers are fully seated, the hydraulic oil level, the oil temperature and whether the control circuit is actually engaging will eliminate most faults in the first minute. If those are sound, move on to the symptom-specific guide.
Can the same symptom have different causes?
Yes, and usually it does. Weak striking, for example, can come from low nitrogen pressure, insufficient oil flow or a worn piston. That is why each cause in these guides also states the symptom that separates it from the others.
Can I open the breaker myself?
The gas chamber is pressurised and dismantling it without discharging is dangerous. Tool, retaining pin and external connection checks can be done on site; leave body opening, piston and valve work to a service workshop.
Do you support breaker brands other than HKM?
Yes. We manufacture tools and spare parts compatible with more than 130 breaker brands, and we give diagnostic support regardless of make.
Still not sure?
Send us the symptom and your machine model; our service team will walk through the field steps with you. Brand does not matter — we supply parts and service support for all breaker makes and models.
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