DTH Hammer Operation and Maintenance
Before Operation:
- After removing the end coupling cover, pour some oil into the hammer from that end and press the valve with a hard, long object (such as a rod) to allow the oil to flow into the hammer.
- During operation, the hammer must also be lubricated with rock drill oil. Refer to the oil consumption table provided in the lubrication methods section for the appropriate amount.
Cleaning the Hammer:
- After dismantling the hammer components, wash them in a cleaning fluid.
- Then, dry the components with compressed air.
Maintenance:
Short-Term Storage:
- Remove any moisture from the hammer by blowing air through it.
- Loosen the front and end couplings at the drilling site.
- Pour one liter of rock drill oil into the end coupling.
- Establish airflow and continue for 10 seconds.
- Disassemble the hammer.
- This will lubricate the internal components of the hammer.
- Store the hammer horizontally in a dry environment.
Long-Term Storage:
- Remove any moisture from the hammer by blowing air through it.
- Wash and lubricate all internal parts with rock drill oil.
- Clean all components thoroughly.
- Replace the front and end coupling covers.
- Store the hammer horizontally in a dry environment.
Recommissioning:
- Before reusing a hammer that has been stored for an extended period, disassemble it and inspect all internal components. If any parts are rusted, use a soft cloth to clean them. Then, wash, dry, and re-lubricate the hammer components with rock drill oil before reassembling.
Important Notes:
- Always initiate rotation before starting the percussive action. Never operate the hammer without rotation, as this can lead to piston breakage.
- Piston jamming within the hammer is usually caused by foreign objects entering the cylinder. In such cases, pour diesel fuel into the hammer without fully disassembling it, then attempt to start it with air pressure. If this is unsuccessful, proceed with further troubleshooting.
- Using drill bits with worn or broken diamond inserts or worn-out chisel inserts not only reduces drilling speed but is also a common cause of piston breakage. Ensure the drill bit is in good condition, and if any issues are observed, send it to the company for repair.
- When changing drill pipes, take care to prevent soil and rock from entering the hammer. After using the hammer and rod, close their plastic covers.