Bleeding Air From Hydraulic System - Komatsu PC45MR-3 Operation And Maintenance Manual

MAINTENANCE

BLEEDING AIR FROM HYDRAULIC SYSTEM

NOTICE
If the pump is operated without filling the pump case with hydraulic oil, there is danger that the pump may be prematurely
damaged. Be sure to bleed the air completely.
1. Bleeding air from piston pump
1) Remove bolts (1) (M10 x 3), then remove triangular cover
(2).
2) Remove the oil filler cap from the hydraulic oil tank.
3) Loosen air bleed plug (3) and check that oil oozes out from
the bleeder plug (completion of air bleeding).
4) After completion of the air bleeding operation, tighten the air bleed plug.
5) Tighten the oil filler cap of the hydraylic oil tank.
6) Install the cover.
2. Start the engine. For details, see "STARTING ENGINE (PAGE 3-57)".
Run the engine at low idle for 10 minutes, then do as follows.
3. Bleeding air from cylinders
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) Run the engine at low idle, 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 approx. 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.
4. Bleeding air from attachment (when installed)
MAINTENANCE PROCEDURE
4 - 47