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MAINTENANCE
4. Remove the cap from oil filler (F) on top of the hydraulic
tank.
5. Place a container to receive drained oil under the drain
plug located in the underpart of the machine. Remove
drain plug (P1) on the suction tube and then loosen (P2) to
drain oil. After draining oil from drain plug (P1), remove
drain plug (3) under the hydraulic tank and drain plug (P4)
on the suction tube to drain remaining oil.
6. Check the O-rings fitted to drain plugs (P3) and (P4) for
any damage. If any, replace the defective O-ring with a
new one. After draining oil, tighten drain plugs (P1), (P2),
(P3) and (P4).
q Tightening torque
(P1) and (P2): 152 ± 24.5 N·m (15.5 ± 2.5 kgf·m)
(P3) and (P4): 68.6 ± 9.8 N·m (7 ± 1 kgf·m)
q When removing drain plug (P3), (P4), be careful not to
get oil on yourself.
7. Add the specified amount of new and clean oil through oil
filler port (F). Check that the oil level is between H and L on
the sight gauge.
For details of oil level check, see "Check Oil Level in Hydraulic Tank, Add Oil (3-80)".
8. Bleed the air from the circuit after cleaning or replacing the filter element or strainer, or after changing the oil.
For details of the method of bleeding the air, see "BLEEDING AIR FROM HYDRAULIC SYSTEM (4-37)".
MAINTENANCE PROCEDURE
4-79
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