7-97
MAINTENANCE
Change Coolant
--- twice a year (in spring and autumn)
f
NOTE: When genuine Hitachi Long-Life Coolant is used,
change interval is once every two years (in autumn every
other year) or every 4000 hours whichever comes first.
d
CAUTION: Do not loosen the cap on the expansion
tank when coolant temperature in the radiator is high.
Hot steam may spout out, possibly causing severe
burns. Loosen the cap slowly to the stop. Release all
pressure before removing the cap.
Procedure:
1. Park the machine on a solid level surface. Lower the
bucket to the ground. Stop the engine.
2. Remove the under cover. Remove the cap from the
expansion tank. Open drain cock (1) on the radiator
to allow the coolant to drain completely. Remove
impurities such as scale at the same time.
3. Close drain cock (1). Refill soft water containing fewer
impurities or tap water and radiator cleaner agent. Close
the cap on the expansion tank. Start the engine and
run it at a speed slightly higher than slow idle; when
the needle of the temperature gauge reaches the green
zone, run the engine for about 10 or more minutes.
4. Stop the engine and open radiator drain cock (1). Flush
out the cooling system with tap water, until draining
water is clear. This helps remove rust and sediment.
1
M1U1-07-029
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