Komatsu ecot3 Operation And Maintenance Manual page 220

OPERATION
MACHINE OPERATIONS AND CONTROLS
Permissible Water Depth
NOTICE
When driving the machine out of water, if the angle of the machine exceeds
15 degrees, the rear of the upper structure will go under water, and water
will be thrown up by the cooling fan. This may cause the fan to break.
Be extremely careful when driving the machine out of water.
Do not drive the machine in water deeper than the center of carrier
roller (1).
Supply grease to the parts which have been under water for a long
time until the used grease is projected out of the bearings (around
the bucket pin, in particular).
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