Common Faults And Solutions For Pneumatic Rib Drills

1. Insufficient Motor Power
Causes: Insufficient air pressure (<0.4MPa), air leakage in the supply line, air hose too thin or too long, air compressor malfunction.
Solutions:
Adjust air pressure to 0.4~0.63MPa, check and tighten air pipe connectors.
Replace the hose with an inner diameter of ≥12mm, shorten the pipe length.
Clean or replace the air compressor filter element.
2. Abnormal Leg Movement (not lifting/lowering or slow speed)
Causes: Exhaust valve blockage, worn seals, dust accumulation in the cylinder.
Solutions:
Disassemble and clean the exhaust valve, replace the O-ring seal.
Clean the cylinder and check the dust seal, replace if necessary.
3. No Water Spray or Intermittent Water Spray During Drilling
Causes: Water valve not open, filter clogged, water pressure too high (>1.2MPa) or insufficient air pressure.
Solutions:
Rotate the water regulator to the maximum opening, clean the filter.
Adjust water pressure to 0.6~1.0MPa, check the airtightness of the air circuit.
4. Drill Machine Self-Rotation or Abnormal Rotation Speed
Causes: Gearbox bearing wear, valve body spring failure, air circuit blockage.
Solutions:
Disassemble the gearbox, replace the 204 bearing and worn gears.
Check the elasticity of the valve body spring and the condition of the seals, clean foreign objects from the air circuit.
5. Reduced or No Impact Force
Causes: Drill bit wear, internal impact hammer damage, unstable air pressure.
Solutions:
Replace the alloy drill bit, check the wear of the impact hammer.
Ensure air pressure is stable at 6~8 bar (0.6~0.8MPa).
Maintenance Suggestions
Daily Maintenance: Run the drill without load after operation to drain accumulated water, lubricate regularly (ZL-2 lithium-based grease).
Safe Operation: Gently touch the rock face when starting drilling, periodically pull the drill rod to prevent jamming.