GM Series
TM19040 P.23/31
5.5. Replacing Lubricant
z
Replacement interval
•
Replace with new oil at 500 engine hours first, after that every 1000 engine hours. Replace the
lubricant if it has been in stock for a long time (1 year or more).
•
If the lubricant deteriorates severely even within the above replacement interval, replace it according to
the following standard.
Replacement
Apply
Viscosity change
（
40[
℃
]
）
[mm
2
/s]
Within 10% compared
with new oil
Progress of oxidative
degradation
Mixing of different oils
Water content
[%]
Within 0.2
External contamination
Pentane insoluble
matter
[%]
Within 1.0
Oxide, carbon, additives, wear
powder, dust, and so on. from
outside
Total oxidation
[mgKOH/g]
0.5 increase
compared with new oil
Progress of oxidative
degradation
Metal analysis
Al
[ppm]
Within 150
Cr
[ppm]
Within 20
Cu
[ppm]
Within 20
Fe
[ppm]
Within 600
Si
[ppm]
Within 350
z
Replacement procedure
CAUTION
•
Confirm that the power of the customer machine is turned off before beginning the
replacement work.
•
Immediately after operation, GM and lubricant may be hot and may cause burns if touched.
Work after the temperature has dropped sufficiently.
•
Lubricant may eject when removing the reduction gears plug to supply and drain oil. Please
work with great care, such as slowly removing the plug to relieve internal pressure.
•
Be sure to wear protective goggles and rubber gloves.
•
Do not replace/replenish the lubricant in a subfreezing environment. Failure to observe this
may result in cold injury. Also, if the lubricant is replaced/replenished in a subfreezing
environment, the temperature difference from the operating temperature increases and the
pressure increase in the reduction gears may cause oil leakage
.
