MACHINE OPERATIONS AND CONTROLS OPERATION 4. Extend the boom, arm, and bucket cylinder fully as shown in the diagram on the right, remove the oil filler cap, then install the cap and pressurize the inside of the tank. NOTICE Be sure to pressurize the hydraulic tank. If it is not pres- surized, the pump will suck in air, and this will adversely affect the equipment. REMARK The oil level will vary depending upon the oil temperature. Accordingly, use the following as the guide: Before operation: around L level (Oil temperature 10 to 30єC (50 to 86єF)) Normal operation: around H level (Oil temperature 50 to 80єC (122 to 176єF)) Air Cleaner Dust Indicator - Check 1.
Open the engine hood and check that the red piston is not showing in dust indicator (1) . 2. If the red piston has appeared, clean or replace the ele- mentimmediately. For details of the method of cleaning the element, see "Air Cleaner Element - Check/Clean/Replace (PAGE 4- 20)". 3. After checking, cleaning, and replacing, press the knob of dust indicator (1) to return the red piston to its original position. 3-40