Hitachi ZAXIS 135US-5B Operator's Manual page 312

12. Remove drain plug (3). Allow oil to drain.
13. Clean, install and tighten drain plug (3).
14. Add oil until it is between the marks on the oil level
gauge.
15. Install cover (2). Tighten the bolts to 50 N·m (5 kgf·m).
16. Be sure to bleed air form the system following the
procedures shown next page.
MAINTENANCE
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M1U1-07-047
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M157-07-062