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IMPORTANT:
When connecting hydraulic hoses and pipes, take
special care to keep seal surfaces free from dirt and
to avoid damaging them. Keep these precautions in
mind.
Wash hoses, pipes, and the tank interior with a
washing liquid and thoroughly wipe off before
reconnecting them.
Only use O-rings that are free of damage or defects.
Be careful not to damage them during reassembly.
Do not allow high pressure hoses to twist when
connecting them. The life of twisted hoses will be
shortened considerably.
Carefully tighten low pressure hose clamps. Do not
overtighten them.
When adding hydraulic oil, always use the same
brand of oil; do not mix brands of oil. As the machine
is filled with Hitachi Genuine Hydraulic Oil 5000
when it is shipped from the factory, use it as a
general rule. When selecting to use another brand of
oil listed in the table "Brand names of recommended
hydraulic oil", be sure to completely replace the oil in
the system.
Do not use hydraulic oils other than those listed in
the table "Brand names of recommended hydraulic
oil".
Never run the engine without oil in the hydraulic oil
tank.
MAINTENANCE
7-49
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