Hitachi EX 3600-6, Operator'S Manual

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MAINTENANCE
7-94
Change Coolant
--- twice a year (in spring and autumn)
Clean Radiator Interior
--- when changing coolant
NOTE: Before leaving the Hitachi Factory, the cooling
system is filled with a mixture of water and
Genuine Hitachi Long-Life Coolant.
As long as Genuine Hitachi Long-Life Coolant is
used, the service intervals between changing
the coolant is once every two years, or every
4000 hours, whichever comes first.
WARNING: Do not loosen the radiator cap until
the engine is cool. Loosen the radiator cap
slowly to the stop. Release all pressure before
removing the radiator cap.
1. Park the machine on a solid and level surface. Lower
the bucket to the ground. Stop the engine.
2. Remove water tank cap (1). Remove the hoses (2),
(3) and open drain cocks (4) and (5) on the drain
pipes to allow the coolant to drain completely. Re-
move impurity such as water scale at the same time.
3. Close drain cocks (4) and (5) and reinstall the hoses
(2) and (3). Fill the radiator with soft water containing
less impurity or tap water and a radiator cleaner
agent via the water tank cap (1). And fill the water
tank in same way between the HIGH and LOW
marks on water tank level gauge (6). Reinstall water
tank cap (1).
4. Start the engine and run it at a speed slightly higher
than slow idle; when the needle of the coolant tem-
perature gauge reaches the blue zone, run the en-
gine for about ten more minutes.
5. Stop the engine and drain water in same way. Flush
out the cooling system with soft water or tap water,
until draining water is clear. This helps remove rust
and sediment.
6. Close drain cocks (4), (5) and reinstall the hoses (2)
and (3). Fill the radiator and water tank with soft wa-
ter or tap water in same way. At that time, mix the
LLC. The concentration of LLC is 50%. Slowly add
coolant to avoid mixing air bubbles in the system.
M18M-07-046
M18M-07-049
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