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PRECAUTIONS FOR HANDLING HYDRAULIC EQUIPMENT
Preventing intrusion of foreign materials during refilling
•
During refilling with the hydraulic oil, do not let water enter
the electrical components.
•
Clean the oil filler port and its around, refilling pump, oil
jug, or etc.
•
Refilling by using an oil cleaning device is better method
since it can filtrate the contaminants accumulated in the oil
during storage.
Replacing hydraulic oil while its temperature is high
•
The higher the oil temperature is, the softer the oil is, and the smoother the oil runs. Also, the sludges are
easily discharged from the circuit. Perform the replacement while oil temperature is high.
•
Old hydraulic oil needs to be drained as much as possible when replacing.
NOTICE
Old hydraulic oil contaminates the new one if it is mixed since it contains contaminants and sludg-
es, and the service life of the hydraulic oil is shortened.
REMARK
Drain the old hydraulic oil not only from the hydraulic tank but also from the filter and drain plug in the cir-
cuit.
Avoid reusing the hydraulic oil and lubricating oil
Avoid reusing the hydraulic oil and lubricating oil which has been drained from the machine.
If reused, any foreign material may enter the hydraulic equipment, and it may cause a failure.
Flushing operation
•
Flushing is required to completely dislodge the contami-
nants and sludges, and existing oil containing those inside
the hydraulic circuit after disassembling and assembling,
and when replacing the oil with the new one.
•
Normally, flushing is performed twice. Primary flushing is
performed by using the flushing oil (1) and the secondary
flushing is performed by using the specified hydraulic oil.
Cleaning operation
Perform oil cleaning to remove the contaminants and sludges in the hydraulic circuit after repair of the hydraulic
device (pump, or control valve) or during operation of the machine.
00-42
00 INDEX AND FOREWORD
PC238USLC-11
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