Komatsu PC78US-6 Operation & Maintenance Manual page 281

ATTACHMENTS AND OPTIONS
RECOMMENDED ATTACHMENT OPERATIONS
NOTICE
If the breaker is greased in an improper posture, it is filled with more grease
than necessary. As a result, soil and sand will enter the hydraulic circuit
and can damage the hydraulic components, while the breaker is in use.
Therefore, be sure to grease the breaker, holding it in the right posture.
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