Mining Equipment Maintenance Tip: Addressing Loss of Rotation Pressure on Epiroc SmartROC D65 Drill Rig

Equipment Model: Epiroc SmartROC D65 Drill Rig (with COP series Drifter)

Failure Symptom: Sudden or gradual loss of rotation pressure and a significant drop in the drilling penetration rate. The drill bit (e.g., a QL80 DTH Bit) appears to be stuck or spinning slowly.

Possible Cause: Internal wear or damage within the drifter's rotation motor or rotation seal kit, or excessive wear on the Shank Adapter (e.g., T45 Shank Adapter). Over time, repeated shock loads can cause premature failure of seals or internal bearings, leading to pressure bypass and diminished rotational torque.

Detailed Solution:

1. System Check: First, verify the hydraulic fluid level and confirm the rotation system relief valve is set correctly.

2. Drifter Inspection: Shut down the machine and isolate the hydraulic system. Remove the drifter and inspect the Shank Adapter (e.g., R32 or T38) for excessive impact surface wear or cracking. If damaged, replace it immediately with a high-quality Hugeminer replacement part.

3. Internal Seal Replacement: If the shank adapter is fine, the issue is likely internal to the drifter. The drifter must be disassembled. Pay close attention to the rotation motor seals and bushings. Replace the entire rotation seal kit, ensuring that all O-rings and backup rings are properly seated to prevent internal leakage and restore full rotation pressure.

4. Testing: Reassemble and test the drifter off-hole before resuming production to confirm optimal rotation and feed rates are achieved.