MAINTENANCE
7-54
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.
CAUTION: Do not loosen the radiator cap until
the system is cool. Loosen the cap slowly to the
stop. Release all pressure before removing the
cap.
1. Remove the radiator cap. Open drain cocks (1) and
(2) on the radiator and engine block to allow the cool-
ant to drain completely.
2. Close drain cocks (1) and (2). Fill the radiator with tap
water and a radiator cleaner agent. Start the engine
and run at a speed slightly higher than slow idle;
when the needle of the temperature gauge reaches
the white zone, run the engine for about ten more
minutes.
3. Stop the engine and open drain cock (1). Flush out
the cooling system with tap water, until draining water
is clear. This helps remove rust and sediment.
4. Close drain cock (1). Fill the radiator with tap water
and an anti-rust agent or antifreeze at the specified
mixing ratio. When adding coolant, do so slowly to
avoid mixing air bubbles in the system.
5. Run the engine to sufficiently bleed the air from the
cooling system.
6. After adding coolant, operate the engine for several
minutes. Check the coolant level again, and add
coolant if necessary.
M1CD-07-023
M197-07-081
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