Komatsu PW160-7K Series Operation And Maintenance Manual page 258

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SERVICE PROCEDURE
CLEANING THE SYSTEM
At 2000 hours clean the cooling system as follows:
1. Drain the system into a suitable container. Refer to "DRAIN-
ING THE SYSTEM (257)".
2. Drain and clean the reserve tank.
3. Close the radiator plug.
4. Fill the system with clean water, refer to "FILLING THE SYS-
TEM (258)" and add a flushing compound that is compatible
with aluminium. Flush the system in accordance with the
instructions furnished with the compound.
5. After flushing, rinsing and completely draining the system.
Refill with clean coolant. Refer to "FILLING THE SYSTEM
(258)".
FILLING THE SYSTEM
REMARK
Be sure to fill the heater and heater supply lines with fresh
coolant, even if the heater is not in use (warm weather). Leaving
the heater core empty causes corrosion in the heater.
1. Be sure the radiator drain is closed and tightened.
2. Fill the cooling system to maximum capacity. Fill with anti-
freeze. For coolant specifications, see "COOLANT (228)".
See "Precautions when filling radiator (226)".
3. Start engine and run until normal operating temperature is
reached. Add coolant when needed to keep proper level in
reserve tank.
4. After all air is removed and level remains fixed, install the
radiator cap.
5. Fill the radiator reserve tank with coolant until level is
between the FULL and LOW markings on the tank.
REFILLING AN OVERHEATED SYSTEM
Do not add coolant to the radiator of an overheated engine unless
absolutely necessary. However, if necessary:
1. Remove the radiator cap. Refer to "RADIATOR CAP" in this
section.
2. Be sure the drain plug is closed.
Use extreme caution when adding coolant to a hot radiator to
avoid being burned. Wear gloves and goggles and keep away
from the filler neck.
3. Add coolant to the radiator slowly until full.
258
WARNING
MAINTENANCE

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