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Inspection and maintenance of hydraulic system
Caution
: in work, the hydraulic system may become very hot. Please cool the machine down before inspection or
maintenance!
1.
Before maintenance of hydraulic system, make sure the machine stands on flat and solid ground.
2.
Lower the bucket onto ground and shut down engine.
3.
Do not start any maintenance until the systems, hydraulic oil and lubricant completely cool down, as the
hydraulic system may be still hot and pressurized as soon as work is over.
a.
Drain the air out of hydraulic oil reservoir to release inside pressure.
b.
Cool the machine down.
Caution
: inspection and maintenance of hot and pressure parts may cause them or hydraulic oil to spray out,
leading to personal injury!
c.
While removing the bolts or nuts, do not have your body facing them, as the hydraulic parts, even if
they cools down, still have pressure. .
d.
Never try to check the traveling or slewing motor circuits on slope, as they may have pressure due to
their dead weight. .
4.
While connecting the hydraulic hoses and pipeline, keep the seal surface free of any dirt and damage. Keep
the above mentioned in mind:
a.
Clean the hose, the pipeline and inside of hydraulic oil tank with detergent, and then thoroughly dry
them.
b.
Use the O-ring free of any damage or defect.
c.
While connecting the pressure hose, do not twist it; otherwise its service span will be shortened. .
d.
Carefully tighten the low-pressure hose clamp.
5.
The hydraulic oil to be added should have the same grade. Namely, do not mix the oil with different grades.
The hydraulic oil has been added before delivery, and therefore, please use the recommended oil. All oil in
system should be changed at once.
6.
With no hydraulic oil, never start up engine.
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