XE210C Hydraulic Excavator
Operating and Maintenance Manual
116
Maintenance
Check and maintenance of hydraulic device
Note: during the operation, the parts of hydraulic system will become very hot, and
cool the machine before starting the check or maintenance.
a)
During the maintenance of hydraulic device, ensure that the machine shall be placed on the flat or
hard ground.
b)
Fall the bucket to the ground, and turn the engine off correctly.
c)
Maintain the hydraulic device after cooling the machine part, hydraulic oil and lubricating oil fully,
because the residual heat and pressure will exist in the hydraulic device soon after finishing the
operation.
1)
Drain the air in the hydraulic oil tank to release its inner pressure.
2)
Cool the machine. Check and maintain the high-temperature or high-pressure parts, because they may
cause the sudden flyout or spray of parts or hydraulic oil and the personal injury.
3)
In case of removing the plug, don’t make your body and face against them, because any hydraulic part
may still have a certain pressure even if the part has been cooled.
4)
Don’t try to maintain or check the traction or rotary motor circuit on the slope, because they can have
high pressures due to their own weights.
d)
During the connection to the hydraulic hose and pipe, pay special attention to the seal surfaces to
ensure no dirt exists on them, and avoid the damages to them. Please remember the following points
for attention:
1)
Clean the inner face of hose, pipe or oil tank with cleaning fluid, and dry them thoroughly before
connecting them.
2)
Use non-destructive or defective O rings, and don’t damage them during the assembling.
3)
During the connection of hose, don’t make the high-pressure hose distorted, because the lifetime of
twisted hose will be greatly reduced.
4)
Tighten the low-pressure hose clamp cautiously, and ensure they can’t be screwed too tight.
e)
In case of filling the hydraulic oil, use the oil of the same brand always, and don’t mix the oils of
different brands. In case of wishing to use the oil listed in “Brands and Names of Recommended
Hydraulic Oils”, ensure that all the hydraulic oil in the system is fully replaced.
f)
Don’t run the engine without oil in hydraulic oil tank.
Check of hydraulic oil level
Important: don’t run the engine without oil in
hydraulic oil tank.
a)
Check the level of hydraulic oil every day.
b)
Park the machine on the flat ground.
c)
Retract the state positioner fully with a bucket rod hydraulic cylinder,
and stretch it out fully with a bucket hydraulic cylinder.
d)
Stop the engine as per the shutdown steps of engine (P20).
Important: if the shutdown steps of engine are incorrect,
the turbo supercharger may be damaged.
e)
Pull the safety locking rod to LOCK (Lock).
Fig.2-29
1
－
liquid-level meter
Fig.2-28
