Change Coolant - Hitachi ZW 120-6 Operator's Manual

Change Coolant

--- every 2000 hours or two years
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CAUTION: Do not remove cap (1) until the coolant
temperature in the radiator is cool. Hot steam may
spout out, possibly causing severe burns. After the
coolant temperature cools, slowly loosen cap (1) to
release the inside air pressure before removing cap (1).
IMPORTANT:
 Use genuine Hitachi long-life coolant. Change the
coolant every two years or 2000 hours whichever
comes first.
1. Park the machine following the same procedures as
described on page 7-7 for preparation of inspection/
maintenance work.
2. Install articulation lock bar to the front and rear of the
frame by following the procedures described on page
7-9.
3. Remove radiator cap (1). Open radiator drain cock (2) to
completely drain the coolant. Remove impurities such as
scale at the same time.
4. Close radiator drain cock (2). Supply low impurity soft
water or tap water together with the specified LLC up
to the radiator filler port. When adding coolant, do so
slowly to avoid mixing air bubbles in the system.
Start the engine and sufficiently bleed air from the
cooling system.
f
NOTE: When refilling a long-life coolant, pour it at flow rate
10 L (2.6 US gal)/min or below. If flow rate is larger than the
above, air does not bleed, being unable to fill the specified
amount.
5. After adding coolant, operate the engine for several
minutes. Check the coolant level again and add coolant
if necessary.
MAINTENANCE
7-69
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MNSC-07-020
MNSC-07-023
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