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D. HYDRAULIC SYSTEM
Inspection and Maintenance of Hydraulic Equipment
WARNING: When inspecting and/or maintaining
hydraulic equipment, pay special attention to the
following points.
1. Be sure to park the machine on a level, solid surface.
2. Lower the bucket and blade to the ground and stop
the engine.
3. Begin servicing hydraulic components only after the
components, hydraulic oil and lubricants are com-
pletely cooled, and after releasing residual pressure.
3.1 Bleed air pressure from the hydraulic oil tank.
3.2 Each component, hydraulic oil, and lubricant may
be hot and/or pressurized immediately after opera-
tion. Allow the machine to cool down before begin-
ning inspection or maintenance. Failure to do so
may cause burns caused by contact with hot
component and/or oil, or injury by contacting flying
off of plugs and /or screws. Hydraulic components
may be pressurized even when cooled. Keep body
parts and face away from plugs or screws and
slowly loosen them. Remove plugs and screws
only after thoroughly releasing the residual pres-
sure.
3.3 Never attempt to service or inspect the travel and
swing motor circuits on slopes. Even after air
pressure is released from the hydraulic oil tank, the
machine on a slope will create force to pressurize
hydraulic oil in the travel and swing circuit by its
own weight.
IMPORTANT:
•
Take special care to keep seal surfaces of hydrau-
lic components free from dirt and to avoid dam-
aging them.
•
Wash hoses, pipes, tank and their surrounding
areas with a washing liquid and thoroughly wipe
it out before reconnecting them.
•
Only use O-rings that are free of damage or de-
fects. Never carelessly file O-ring seat surfaces.
Do not allow high pressure hoses to twist when
connecting them. Failure to do so may consid-
erably shorten the service life of the hoses.
•
Do not use hydraulic oils other than those listed in
the table "Brand names of recommended hydrau-
lic oil". When adding hydraulic oil, always use the
same brand of oil. Do not mix brands of oil. When
selecting to use another brand of oil, be sure to
completely replace the oil in the system.
•
Never run the engine without oil present in the
hydraulic oil tank.
MAINTENANCE
7-22
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