MAINTENANCE EVERY 2000 OPERATING HOURS BLEEDING THE HYDRAULIC OIL TANK 1. Loosen the feeding and ventilation screw by turning it a cou- ple of rotations. 2. Start up the engine. 3. Bring the boom into its highest position. 4. Bring bucket into its tip-in position (up to its limit stop). 5. Re-tighten the feeding and ventilation screw. COOLING SYSTEM, CHECKING THE ANTIFREEZE CONTENT OF THE COOLANT Check the antifreeze content of the coolant. The mixing propor- tion must always be adjusted to a temperature of -34.6°F (-37°C) - even in areas with moderate climate. During filling up, pay attention to the prescribed mixing proportion. The coolant must contain antifreeze in all climate regions.
The antifreeze does not only decrease the freezing point but also increases the boiling point. It lubricates movable components and lip seals and prevents corrosion and foam formation. CHECKING THE COOLING SYSTEM Let the cooling system check be performed at your local Komatsu dealer. CHECKING THE FUEL PUMP Let the fuel pump be checked at your local Komatsu deal- er. CHECKING THE FUEL AND COOLANT TUBES, REPLACING THE TUBES (IF REQUIRED) Have the fuel and coolant tubes checked and replaced, if required, at your local Komatsu dealer. 7-65