Hobart 120CU20, Operation And Maintenance Manual With Illustrated Parts List

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OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October 15, 2013 Chapter 2-2
Page 2
(2) Oil specification.
Engine lubricating oil, recommended by the engine manufacturer, is identified by an API
(American Petroleum Institute) classification designation. The manufacturer does not
recommend any specific brand of lubricating oil.
The use of quality lubricating oil, combined with appropriate lubricating oil drain and filter change
intervals, are important factors in extending engine life.
Oil recommended for the diesel engines in this application is API Class CCMC.
Lubricating oil is discussed in detail in the engine manufacturer’s operation manual.
(3) Oil viscosity.
A temperature and oil viscosity index chart is shown below. For operation at temperatures
consistently below -13ºF (-25ºC), refer to the engine manufacturer’s operation manual.
(4) Changing engine oil.
Oil should be changed once after the first 50 - 150 hrs. of use, then every 500 hrs of engine
operation thereafter. The generator set is equipped with an hour meter to record actual engine
operating time. The ideal time to change engine oil is soon after a power delivery run, when the
engine is at operating temperature.
Change the oil filter element each time the oil is changed.
NOTE: If lubricating oil is drained immediately after the unit has been run for some time, most of the
sediment will be in suspension and will drain readily.
CAUTION
High ash oils may produce harmful deposits on valves that can cause valve burning.
CAUTION
Do not use solvents as flushing oils in running engines.
Change oil as follows:
a Provide an open container for catching the old oil below the oil drain plug. Container capacity
must be greater than 30 quarts (28.4 liters).
b The oil drain tube can be attained though a hole in the access panel underneath the
generator set.
c Open drain plug located in oil pan.