TROUBLESHOOTING 3.15.4 OTHER TROUBLES (•): Always contact your Komatsu Utility Dealer when you have to carry out this operation. (•): If the anomaly or its cause are not included in the failures indicated below, contact your Komatsu Utility Dealer for the necessary repair. 3.15.4.1 ELECTRICAL CIRCUIT 3.15.4.2 HYDRAULIC SYSTEM 138 TROUBLE CAUSE REMEDY Lights do not work satisfactorily even with engine running at high speed: • Faulty cables. • Faulty fan belt tension. (•) Check and repair any loose termi- nal and connection. • Adjust fan tension (see “EVERY 250 HOURS). Lights come on intermittently with engine running:
Alternator charge warning light does not go out with engine running and increasing speed: • Faulty alternator. • Faulty cables. (•) Change. (•) Check and repair. Alternator emits an abnormal noise: • Faulty alternator. (•) Change. Starter does not turn with key in START position: • Faulty cables. • Battery charge insufficient. • Faulty engine start fuse. (•) Check and repair. • Charge battery. • Change. Starter pinion engages and then dis- engages: • Battery charge insufficient. • Charge battery. Starter makes engine run slowly: • Battery charge insufficient. • Faulty starter. • Charge battery. (•) Change. Starter disengages before engine has started: • Faulty cables.
• Battery charge insufficient. (•) Check and repair. • Charge battery. Engine oil pressure warning light does not come on when engine is stopped (ignition key in position « »): • Faulty bulb. • Faulty pressure sensor. (•) Change. (•) Change. Alternator charge warning light does not come on when engine is stopped (ignition key in position « »): • Faulty bulb. • Faulty cables. (•) Change. (•) Check and repair. TROUBLE CAUSE REMEDY Pump emits an abnormal noise: • No oil in the tank. • Faulty pump. • Hydraulic oil unsuitable for the tem- perature. • Top up. (•) Repair or change. • Change. Equipment control levers do not return automatically to neutral position:
• Broken return spring or seized ele- ment. (•) Change spring or distributor ele- ment. Equipment moves only at low speed: • Faulty pump. • Max. pressure valves out of rating, or not closed due to impurities. • Dirty drain filter. (•) Repair or change. (•) Calibrate or change. • Change.