GM Series
TM19040 P.21/31
z
Filling volume of hydraulic oil
Prepare hydraulic oil according to the amount of hydraulic oil described in the confirmation notice.
z
Temperature and viscosity range of hydraulic oil
Make sure that the operating temperature range and viscosity range of the hydraulic oil do not exceed the
following ranges.
•
Operating temperature range
：
-20
～
90 [
℃
]
•
Practical viscosity range
：
15
～
500 [mm
2
/s]
（
Limit usage range
：
10
～
1000 [mm
2
/s]
）
NOTICE
When using with a viscosity of 500 [mm
2
/ s] or more, the motor may not be able to suck oil and
may cause malfunction. In addition, if the viscosity is less than 10 [mm
2
/ s], the performance will
decrease significantly, and if it is used for a long time, the motor sliding part may get damaged,
resulting in a permanent deterioration in performance.
5.3. Replacing Hydraulic Oil
z
Replacement interval
•
Replace with new oil every 1000 engine hours or 1 year.
•
If the deterioration of the hydraulic oil is severe even within the above replacement interval, replace it
according to the following standard.
Test items
Replacement criteria
Viscosity change
（
40[
℃
]
）
[mm
2
/s]
Within ±10[%]
Total oxidation
[mgKOH/g]
Consult with the hydraulic oil
manufacturer because it depends on
the oil type and manufacturer.
Water content
[%]
Within 0.1
Impurities
[mg/100mL]
Within 10
Insoluble content
[%]
Within 0.05
Color
―
Drastic change
