Problem Description:

Rotary head mud ingestion and abnormal sound.

Troubleshooting Steps:
– Cleaned gearbox; replaced pinion gears and upper/lower bearings; replaced slewing ring; replaced coupling sleeve; replaced upper/lower skeleton oil seals and water seal.

Root Cause:

No details recorded.

Required Parts:

Cleaned gearbox; replaced pinion gears and bearings; replaced slewing ring; replaced coupling sleeve; replaced oil seals and water seal.