Rock Drill Troubleshooting Guide: Diagnosing Common Problems

Systematic troubleshooting saves time and prevents unnecessary parts replacement. This guide covers the most common rock drill problems and their likely causes.

No Percussion

Possible causes: no hydraulic pressure, blocked oil circuit, failed valve, seized piston, or failed accumulator. Check hydraulic pressure first, then work through the system systematically.

Weak Percussion

Possible causes: low hydraulic pressure, worn piston or cylinder, incorrect valve timing, low accumulator pre-charge, or blocked flushing. Measure percussion pressure and compare to specification.

No Rotation

Possible causes: failed rotation motor, blocked rotation circuit, seized chuck, or broken drive gear. Check rotation pressure and flow before disassembling the motor.

Excessive Oil Consumption

Possible causes: worn piston seals, damaged cylinder bore, failed front head seals, or external leaks. Identify the source of oil loss before replacing parts.

Overheating

Possible causes: insufficient hydraulic oil flow, blocked cooler, incorrect oil viscosity, or excessive back pressure. Check oil temperature and flow rates against specification.

Unusual Noise

Possible causes: worn piston, damaged valve, loose components, or cavitation. Unusual noise is always a warning sign — investigate immediately to prevent major damage.