5 Maintenance5.6 Check and maintenance every 200hoursCarry out the following inspection andmaintenance every 50h.■ Check and adjusting of tension of fan belt1. Press the central part of driving belt wheel offan and DC generator belt wheel with force of10kgf and measure the deflection A.2. If the deflection exceeds standard value,loosen 2 bolts on DC generator. Move the DCgenerator and adjust tension of its belt.Deflection of fan belt wheel A……Standardvalue:appro.7~9mm/58.8~68.6N(6~7kgf)3. Check each belt wheel, type V slot and type Vbelt for any damages; particularly check type Vbelt to see if it contacts with bottom of type V slot.4. Belts become long loosing adjustment functionor have any cut wound or cracks; in case of any,please replace in time.Important* In case of working under weak tension of beltand continuous operating of the machine, the beltmay slip to cause performance reduction of theengine and shorten its service life. Therefore,check and adjust belt tension.* Stop the engine if charging lamp illuminates justcaused by broken belt.■ Check radiator pipe1. Tighten loosened ring clamp; in case of waterleakage, tighten the ring clamp.2. Replace the pipe in case of expansion,stiffening or cracks, and tighten the ring clamp.Ring clampRubber pipe on radiator■ Cleaning and check off air filter elementOpen engine cover, remove dust shield and takeout the element. Clean the element and dustshield as well as internal surface of casing.Dust shield◆ Cleaning methodBlow and clean exterior of element with drycompressed air [below 203kPa(2.1kgf/cm2)];blow from interior to exterior to clean all dust anddirt. Wear protection glasses to prevent dustentering your eyes, especially working in placeswith many sands. Carry out cleaning and checkas early as possible.5.7 Check and maintenance every 250 hoursCarry out the following inspection andmaintenance every 50h.■ Check and tightening of nuts on tyre hubsRefer to [Replacement of tyre] (page 35).■ Replacement of engine oil(50h for initial time)1. Remove the drainage bolts on engine oil tray atbottom of engine, put them on lower left of rearsupport and drain out the engine oil.2. Tighten each bolt after oil drainage.3. Fill certain fresh engine oil through fillingopening.4. Keep the engine racing first and check oil levelwith oil gauge about 5 min after stopping racing.ElementCasing31