Bleeding Air In Hydraulic System - Komatsu D475A-5E0 Operation & Maintenance Manual

MAINTENANCE

BLEEDING AIR IN HYDRAULIC SYSTEM

See "OPERATIONS AND CHECKS AFTER STARTING ENGINE (PAGE 3-122)".
Since the engine must be started and the blade must be operated, see OPERATION.
NOTICE
If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke end, air taken inside the cylinder
may cause damage to the piston packing.
1. Bleeding air from cylinders
1) Run the engine at Low idle (MIN), and extend and retract each cylinder 4 to 5 times, taking care that a
cylinder is not moved to the end of its stroke. (Stop the cylinder approximately 100 mm {3.9 in} short of its
stroke end)
2) Next, operate each cylinder 3 to 4 times to the end of its stroke.
3) Finally, operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air.
SERVICE PROCEDURE
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