SECTION 2 MAINTENANCE Page 2 PERIODIC MAINTENANCE Proper lubrication and maintenance assure trouble-free operation and long machine life. Time and money spent for scheduled periodic maintenance will be amply compensated by prolonged machine operation and reduced operatmg cost All hourly figures given in the following descriptions are based on service meter readings In practice. however, it is recommended to rearrange all of them into units of days, weeks and months to, make the maintenance schedule more convenient.
Under rough jobsite or operating conditions, It is necessary to somewhat shorten the maintenance intervals stated in this manual BLEEDING AIR FROM CIRCUIT BLEEDING AIR FROM HYDRAULIC CIRCUIT After replacing oil, filter element or strainer, bleed the air from the circuit. To bleed the air from the hydraulic cyhnders or hydraulic piping, run the engine at low Idling and do as follows Operate each hydraulic cylinder (of steering, bucket and lift arm) 4 to 5 times, stopping IOOmm from stroke end Next, operate each cylinder 3 to 4 times to the end of its stroke, then stop the engine and loosen air bieeding plug (1) of the hydraulic tank to bleed the air.
Increase the engine speed, and repeat step 2 to bleed the air until no more bubbles come out from Plug (1). If the engine is run at high speed at first, or if the cylinder IS moved to the end of its stroke, the air 1” the cyllnaer may damage the piston packing. etc After bleeding the air, tlghten the air bleeding plug (1) Tightening torque of the plug- 1 15 to.15 kgm