Komatsu Utility 69001, Operation & Maintenance Manual

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SERVICE PROCEDURE
MAINTENANCE
4-32
CLEANING AND INSPECTION OF FINS OF RADIATOR, OIL COOLER, CONDENSER AND
AFTER-COOLER
4
If the radiator fins are clogged or dirty, clean and inspect them.
CLEANING BY COOLING FAN REVERSE TURN
NOTICE
q
When turning the cooling fan in the reverse direction,
be careful of dirt that is sent flying around.
q
Leave open the right and left engine side covers so
that dirt does not accumulate in the engine room.
q
When stopping the engine while the cooling fan is
turning in the reverse direction, first reduce the engine
rotation to a low idling speed and then stop it.
The dust and dirt stuck to the radiator and cooler can be blown
out by rotating the cooling fan in the reverse direction.
1. Turn starting switch (1) to the OFF position and stop the engine.
2. Turn starting switch (1) to the ON position.
3. Set fan rotation selector switch (2) to the cleaning position
(CLN).
Cooling fan operation checking lamp (3) lights up.
REMARK
Even if it is attempted to reverse a rotation direction of the cool-
ing fan while the engine is running, the rotation direction cannot
be changed.
In that case, cooling fan operation checking lamp (3) flashes
and warns that the fan rotation cannot be reversed.
4. Turn engine starting switch key (1) to the ON position to start up the engine. Then the cooling fan begins to
rotate in the reverse direction.
5. Run the engine at high idle.
Select the time for running the engine at high idle as follows according to the condition of clogging.
Normal clogging: 1 to 2 minutes
Excessive clogging: 2 to 3 minutes