Soosan SB121 - Oil Contamination and Malfunction Criteria

Soosan H
y
draulic Breaker
Soosan Heav
y
Industries Co.
,
Ltd
■ Criterion of Oil Contamination and Malfunction
(General Analysis)
Analysis Item Criterion Causes and Effects when exceed the criterion
Adhesiveness
Within±10%
(40℃ cst)
Adhesiveness rarely decreases because of hydraulic oil.
Entry of different kind of oil may reduce the adhesiveness
which contributes to rising oil temperature , wear and scratch
of bearing and gear and malfunction of hydraulic oil.
Oxidizing Level
Less than 0.3
(mg KOH/g)
Use of lubricating oil in a long period or in a high temperature
(above 60℃) will oxidize it. Oxidizing level rises as oxidization
proceeds. Sludge will be produced during the process and
it leads to malfunction, corrosion and ageing.
Moisture
Less than
0.1(%)
Moisture causes rust, wear and scratch. Moisture of 0.3%
goes considerably rusty and moisture of 0.5% occurs the
damage of machine.
■ Criterion of Oil Malfunction by Hydraulic Oil Color
(Simple discrimination by ASTM color)
Hydraulic oil turns black as the breaker fails to display best performance. The old oil is assumed to be
contaminated when there is a visual difference between the old new oil color and functions begin to
deteriorate when hydraulic oil turns darker than the new oil color (ASTM number) by more than two.