- Possible Causes:
-
- A
- Bit blow tube is broke
- B
- Piston stuck in sleeve due to
-
- ① Sleeve was pinched shut with wrench when threads were being loosened/tightened
- ② Foreign material entered through drill string and jammed piston
- ③ Mud backed up into hammer (when drilling under water), inspect the check valve
- ④ An internal part failed
Slow penetration when pressure is ok
- Possible Causes:
-
- A
- Dull or broken buttons on bit
- B
- Incorrect drill rotation or down pressure for the formation being drilled
- C
- Harder rock formation than the normal
- Possible Causes:
-
- A
- Leak in the air line
- B
- Leak in the hammer ( crack or broken part)
- C
- Compressor output problem
- Possible Causes:
-
- A
- Air line is partially closed off
- B
- Foreign material clogging air passages in hammer
- C
- Bit blow holes are clogged
