MAINTENANCE PROCEDURE 4.9.1.k CHECK, CLEAN AND LUBRICATE CAB SLIDE DOOR RAIL AND ROLLER (Machine equipped with cab) CHECKING When opening or closing the slide door, if it is clogged with mud and does not move freely, clean and supply grease to roller (2) and rail (1) of the slide door. CLEANING 1. Open and close the door, and use a brush to remove any dirt from rail (1). 2. Use a cloth to wipe off any dirt from rail (1). GREASING IMPORTANT Do not use high-viscosity oil for the lubricant. Use grease only. 1. Spray rail (1) and roller (2) thoroughly with lubricant. 2. After spraying with lubricant, slide the door and check that the door opens and closes smoothly.
If the movement is not smooth, contact your Komatsu Dealer for repair. 4.9.1.l BLEEDING AIR FROM HYDRAULIC SYSTEM 1. Start the engine. For details, see "3.3.1.5 STARTING ENGINE". Run the engine at low idling for 10 minutes, then do as follows. 2. Bleeding air from cylinders IMPORTANT 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. 3. Run the engine at low idling, and extend and retract each cylinder 4 to 5 times, taking care so that a cylinder may not be brought up to its stroke end. (Stop the cylinder approx. 100 mm (3.9 in.) short of its stroke end). 4.
Next, operate each cylinder 3 to 4 times to the end of its stroke. 5. Finally, operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air. 6. Bleeding air from attachment (when installed) IMPORTANT If the method of bleeding the air from the attachment itself is specified by the manufacturer, bleed the air according to the specified procedure. After completing the air bleeding operation, stop the engine, and leave the machine for 5 minutes before starting operations. This will remove the air bubbles in the oil inside the hydraulic cylinders. Check that there is no leakage of oil and wipe off any oil that has been spilled.
If a breaker or other attachment has been installed, run the engine at low idling and operate the attachment pedal repeatedly (approx. 10 times) until the air has been bled from the attachment circuit. 192