MAINTENANCE 18.1.2 FUEL The fuel pump is a precision instrument, and if fuel containing water or dirt is used, it cannot work properly. Be extremely careful not to let impurities get in when storing or adding fuel. Always use the fuel specified in the Operation and Maintenance Manual. Fuel may congeal depending on the temperature when it is used (particularly in low temperatures below-15 C (5 To prevent the moisture in the air from condensing and forming water inside the fuel tank, always fill the fuel tank after completing the day's work. Before starting the engine, or when 10 minutes have passed after adding fuel, drain the sediment and water from the fuel tank.
If the engine runs out of fuel, or if the filters have been replaced, it is necessary to bleed the air from the circuit. 18.1.3 COOLANT River water contains large amounts of calcium and other impurities, so if it is used, scale will stick to the engine and radiator. This will prevent proper heat exchange and cause overheating. For specific requirements of the water, See "20.3 COOLANT SPECIFICATIONS on page 3-14 When using anti-freeze, always observe the precautions given in the Operation and Maintenance Manual. An anti-freeze concentration greater than 68% will adversely affect freeze protection and heat transfer rates.
Anti-freeze concentrations between 68% and 100% actually have a higher freezing point than a 68% anti-freeze concentration and should not be used due to reduced heat transfer rates. All cooling system inhibitors, including those in anti-freeze solutions, become depleted through normal operation. If the inhibitors in anti-freeze are allowed to become depleted, the anti-freeze becomes corrosive and attacks and coats the metallic surfaces of the cooling system which reduces heat transfer. Cooling system conditioners which contain these inhibitors must be added to maintain corrosion protection. Anti-freeze is inflammable, so be extremely careful not to expose it to flame or fire.
The proportion of anti-freeze to water differs according to the ambient temperature. For details of the mixing proportions, see "20.3 COOLANT SPECIFICATIONS on page 3-14. If the engine overheats, wait for the engine to cool before adding coolant. If the coolant level is low, it will cause overheating and will also cause problems with corrosion from the air in the coolant. 18.1.4 GREASE Grease is used to reduce friction and help prevent wear, twisting and noise at the joints. Grease fittings that were not referred to in the maintenance schedule do not require any scheduled greasing. Add grease to these areas only If something becomes stiff or squeaky.
Always wipe off all of the old grease that is pushed out when greasing. Be particularly careful to wipe off the old grease in places where sand or dirt sticking in the grease would cause wear of the rotating parts. 3-6 WA320-3MC