. MAINTENANCE MAINTENANCE PROCEDURE CHECK WATER PUMP 4 - 73 EVERY 4000 HOURS MAINTENANCE Maintenance for every 50, 100, 250, 500 , 1000 and 2000 hours service should be carried out at the same time. Check that there is no play in the pulley, l eakage of oil or water, or clogging of the drain hole. If any abnormality is found, please contact your Komatsu distributor for r epairs or replacement.