Hitachi EX 3600-6, Operator'S Manual

Page: 231 / 306

MAINTENANCE
7-92
•
Checking and Controlling Coolant
Obtain the concentration value from the concentration
check table. Concentration and its control are as follows.
Coolant Additive Agent DCA4 Control Standard
Concentration of
Antifreeze or
LLC Concentration per 1 US gal
of Coolant Additive Agent
DCA4
Control Method
1.2 or less Replace the coolant filter. Add one bottle of DCA60L (con-
taining 5 DCA units) per 15 L of coolant.
1.2 to 3.0 Perform the normal maintenance service. Replace the coolant
filter every 500 hours.
3.0 or more 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.
50%
Necessary DCA4 Volume to
be Added When Replacing
Total Coolant. Add 1.75 DCA units per 1 US gal (3.785 L) of 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.