Komatsu PW130ES-6K Operation & Maintenance Manual page 227

SERVICE PROCEDURE MAINTENANCE.
CHECK VIBRATION DAMPER
Check the index lines (A) on the damper hub (B) and the inertia
member (C). If the lines are more than 1.59 mm out of alignment,
replace the damper.
Vibration damper
CHANGE OIL IN AXLES
1. Remove plugs (1) and (2) to drain oil.
2. Replace plug (2).
3. Attach tube and funnel to plug (1) hole and add oil until oil
emerges when tube is removed.
4. Replace plug (1).
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