Prinoth 908930245, Руководство по эксплуатации и техническому обслуживанию

Страница: 145 / 252

■ Corrosion protection
■ Freezing protection
■ Increases boiling temperature
Coolants that contain an unsuitable antifreeze, or have been insufficiently or incorrectly prepared, can
cause the failure of assemblies and components in the cooling system through cavitation or corrosion
damage. They can also cause heat-insulating deposits to form on heat transfer components, thus
causing overheating and finally engine failure.
The cooling system only functions reliably when it is under a primary pressure. It is therefore essential
to ensure that it is kept clean and leaktight, that the radiator closing/opening valves are functioning
correctly and that the required coolant level is maintained.
Antifreezes tested and approved by Caterpillar ensure sufficient cold, corrosion and cavitation protec-
tion, do not attack seals and hoses, and do not foam.
Water
■ Clean water without additives cannot be used as coolant even if no antifreeze properties are re-
quired.
The coolant water must meet the following requirements which are not always met by drinking
water:
□ Specific pH value
□ Free of impurities
The water must be treated if the water quality is not sufficient.
Anticorrosion/antifreeze agents
■ To prevent damage to the cooling system:
□ Only use approved anticorrosion/antifreeze agents. Information can be obtained from every
Caterpillar service support point.
□ When replenishing coolant (after loss of coolant), ensure an anticorrosion/antifreeze agent
ratio is correct.
□ Do not use more than 55 % by volume (max. anti-freeze) anti-corrosion/anti-freeze agent.
The antifreeze effect will otherwise be reduced and heat dissipation will deteriorate.
NOTICE
Risk of engine damage
Coolant loses its anti-corrosion properties over time. If the concentration is too low, engine damage
may occur as a result of corrosion/cavitation. If the coolant level is low, the engine may overheat.
► Replenish coolant losses immediately.
► Only use the specified coolant.
Checking and replacing the coolant
■ Check the concentration every three months, using a density measurement spindle or refractom-
eter.
■ Never allow the antifreeze concentration to fall below 40 % by volume.
■ Avoid concentrations above 50 % by volume, as a high proportion of antifreeze will cause the
coolant temperature to rise.
■ If using CAT DEAC coolant, replace after 3000 h or three years at the latest.
If using Commercial heavy-duty coolant, replace after 3000 h or one year at the latest.
■ Irrespective of coolant change intervals, change the coolant if it appears brown or cloudy.
Snow groomer BISON
Operating and Maintenance Manual
BISON 908930245 - 30367
10 - Engine system 147
( 255 )