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.
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