Komatsu PC138US-11 Operation & Maintenance Manual page 210

MACHINE OPERATIONS AND CONTROLS
3.
After checking, turn the starting switch back to OFF posi-
tion (A).
4.
Open the machine right front cover, turn the filler cap (2)
counterclockwise.
Open the filler cap.
The caps of DEF tanks are blue, as required by emission
regulations.
5.
By sight gauge (3), add DEF through the filler port until
float (4) reaches line F (5).
Line (6) in the sight gauge indicates approximately 5 ℓ be-
low line F, and line (7) indicates approximately 10 ℓ.
Line (8) is the max adding line when DEF may freeze in
cold weather.
6.
After adding, align claw (9) of the cap with groove (10) of
the filler port and close the cap securely by turning it clock-
wise by 90 °.
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WENAM00111
OPERATION