Change Coolant - Hitachi ZAXIS 135US-5B Operator's Manual

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 radiator cap until the
system has cooled. 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 radiator cap. 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). Fill the radiator with soft water
containing fewer impurities or tap water and a radiator
cleaner agent. Run the engine at a speed slightly higher
than slow idle for about 10 minutes until the coolant
temperature gauge becomes horizontally.
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.
MAINTENANCE
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M1U1-07-029