Hitachi EX 3600-6 Operator's Manual page 231

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Checking and Controlling Coolant
Obtain the concentration value from the concentration
check table. Concentration and its control are as follows.
Concentration of Concentration per 1 US gal
Antifreeze or of Coolant Additive Agent
LLC DCA4
1.2 or less
1.2 to 3.0
3.0 or more
50%
Necessary DCA4 Volume to
be Added When Replacing
Total Coolant.
IMPORTANT: Water with a lot of impurity or insuffi-
cient quantity of DCA4 will lead to corro-
sion of cylinder liners, which will result
in engine damage.
MAINTENANCE
Coolant Additive Agent DCA4 Control Standard
Replace the coolant filter. Add one bottle of DCA60L (con-
taining 5 DCA units) per 15 L of coolant.
Perform the normal maintenance service. Replace the coolant
filter every 500 hours.
Keep using the coolant until concentration is reduced to 3
units without replacing the filter.
Use the filter up to the next 500 hour replacement time
(maximum useable time limit: 1000 hours). In case concentra-
tion is over 4.0 units, replace the total coolant and conduct the
initial charge in accordance with Item in this manual.
Add 1.75 DCA units per 1 US gal (3.785 L) of coolant.
7-92
Control Method