Komatsu GD555-5 Operation & Maintenance Manual page 278

MAINTENANCE
CLEAN RADIATOR FINS AND COOLER FINS
If compressed air, pressurized water, or steam hits your body directly, or causes dirt to fly, it may lead to personal injury. Always
wear safety glasses, dust mask, or other protective equipment.
Clean the radiator fins if any mud or dirt is stuck to the radiator.
CLEAN FINS BY ROTATING COOLING FAN IN REVERSE
NOTICE
When rotating the fan in reverse, be careful of flying dust, and be careful
not to let any cloth get caught in the fan.
Dust may rise, so check that there is no one in the surrounding area when
rotating the fan in reverse.
On jobsites where it is easy for dirt to stick to the radiator or cooler,
turn cooling fan reverse rotation switch (1) ON to rotate the fan in
reverse. This will blow off the dirt and dust stuck to the radiator or
cooler, and can extend the cleaning interval.
1. Open engine side covers (1) on the right and left sides of the
machine and fix them by using lock bars (2).
2. Open covers (3) on the right and left sides of the machine.
FAN REVERSING METHOD
NOTICE
Never rotate the fan in reverse when carrying out the operation.
Before operating the fan reverse rotation switch, run the engine at low idle.
1. Set the gear shift lever to the P (PARKING) position and apply the parking brake.
2. Run the engine at low idle.
3. Press position (A) of cooling fan reverse rotation switch (1).
REMARK
The cooling fan switches to the reverse rotation once pressing the
cooling fan reverse rotation switch. As it is not necessary to
continue to press, release the switch.
WARNING
SERVICE PROCEDURE
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