Hitachi ZAXIS 135US-5B Operator's Manual page 348

5. Close drain cock (1). Fill the radiator with tap water and
LLC at the specified mixing ratio. When adding coolant,
do so slowly to avoid mixing air bubbles in the system.
Run the engine to sufficiently bleed air from the cooling
system.
It is necessary to bleed air from water lines of EGR.
Loosen the plug and bleed air.
6. After adding coolant, operate the engine for several
minutes until the temperature gauge stabilizes. Check
the coolant level again, and add coolant if necessary.
ZX135US-5B is not necessary to bleed air from water lines of
EGR.
MAINTENANCE
7-74
ZX225US-5B, 225USLC-5B
MDAA-07-099