Doosan DX700LC Operation And Maintenance Manual page 242

5. Install drain plugs (1, Figure 96), EGR plugs (3 and 4,
Figure 98) and close drain valve (2, Figure 97) after
coolant has completely drained from system. Reconnect
heater hoses with clamps (5 and 6, Figure 99).
6. Slowly fill cooling system with flushing solution to radiator
neck.
7. Run engine at low idle until coolant temperature reaches
"BLUE ZONE". Continue running engine for another five
minutes.
8. Shutdown engine. Remove drain plugs (1, Figure 96), EGR
plugs (3 and 4, Figure 98) and open drain valve (2, Figure
97) to drain flushing fluid. Drain flushing fluid from heater
hoses after removing clamps (5 and 6, Figure 99).
9. Install drain plugs (1, Figure 96) and close drain valve (2,
Figure 97). Reconnect heater hoses with clamps (5 and 6,
Figure 99).
10. Do not install EGR plugs (3 and 4, Figure 98).
11. To prevent air from entering cooling system, slowly fill
system with coolant. Use proper antifreeze mixture for
ambient temperature.
NOTE:
Refer to coolant concentration table. See
"Antifreeze
page 4-83.
12. When system is filled with coolant to EGR plug holes (3
and 4, Figure 98), install plugs and continue filling to
radiator neck.
13. Run engine for five minutes at low idle so air will be purged
from system.
14. Loosen EGR plugs (3 and 4, Figure 98) a little and vent air.
Tighten EGR plugs.
15. Shutdown engine and fill radiator with coolant to radiator
neck again. Install radiator cap.
16. Fill recovery tank with coolant to middle of "FULL-LOW"
after draining old coolant in recovery tank and washing it
out.
Inspection, Maintenance and Adjustment
4-54
Concentration Tables"
Figure 97
on
Figure 98
5
Figure 99
2
FG016140
4
3
FG016138
6
FG016139
OP001123