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D. HYDRAULIC SYSTEM
INSPECTION AND MAINTENANCE OF HY-
DRAULIC EQUIPMENT
CAUTION: During operation, the parts of the hy-
draulic system become very hot.
Allow the machine to cool down before beginning
inspection or maintenance.
1. Be sure that the machine is parked on a level, firm
surface before servicing hydraulic equipment.
2. Lower the bucket to the ground and stop the engine.
3. Begin servicing hydraulic components only after
components, hydraulic oil and lubricants are com-
pletely cooled, and after releasing residual pressure.
3.1 Bleed air from the hydraulic oil tank to release in-
ternal pressure.
3.2 Allow the machine to cool down.
Note that servicing heated and pressurized hydrau-
lic components may cause hot parts and/or oil to fly
off or escape suddenly, possibly resulting in per-
sonal injury.
3.3 Keep body parts and face away from plugs or
screws when removing them.
Hydraulic components may be pressurized even
when cooled.
3.4 Never attempt to service or inspect the travel and
swing motor circuits on slopes. They are highly
pressurized due to self-weight.
4. 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:
4.1 Wash hoses, pipes, and the tank interior with a
washing liquid and thoroughly wipe it out before re-
connecting them.
4.2 Only use O-rings that are free of damage or defects.
Be careful not to damage them during reassembly.
4.3 Do not allow high pressure hoses to twist when
connecting them. The life of twisted hoses will be
shortened considerably.
4.4 Carefully tighten low pressure hose clamps.
Do not overtighten them.
MAINTENANCE
7-24
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