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4. Lubrication
A. General
Proper lubrication is one of the most important steps in good maintenance procedures. Proper
lubrication means the use of correct lubricants and adherence to a proper time schedule. Frequency
of lubrication and recommended lubricants are indicated in Figure 3.
B. Generator
The 400-Hz generator requires NO lubrication. The rotor is supported by two ball bearing assemblies
which are lubricated and sealed at the factory for lifetime, maintenance-free operation. It is suggested
that generator bearings be checked after 5000 hours of operation.
C. Generator Controls
Generator controls and instruments require no scheduled periodic lubrication. A few drops of oil may
be required on door hinges occasionally to insure free an quiet operation.
D. Engine
Although the engine and its accessories require no more attention than any other similar installation,
they still inherently require a major portion of the generator set lubrication and maintenance.
Recommendations regarding engine lubrication have been taken from the engine manufacturer's
"Operator's Manual" and incorporated here to make them more readily available to operators and
maintenance personnel.
(1) Lubrication schedule
Time schedules indicated on the Lubrication Chart, Fig. 3, are approximate. They are based on
average operating conditions. It may be necessary to lubricate more frequently under severe
operating conditions such as: low engine temperatures, excessively heavy loads and high oil
temperatures, or intermittent operation. However, time intervals should not exceed those
indicated in the chart without careful evaluation.
(2) Oil specification
Oil recommended by the engine manufacturer is identified by a military specification number, MIL-
L-2104B. Because of the substantial increase in additive concentration in some MIL-L-2104B oils
to meet service "MS" requirements, recommended oil is qualified still further by the following
limitations
(a) Zinc, as zinc diorganodithiophosphate, between a minimum of 0.07 and a maximum of 0.10
percent by weight.
(b) Sulfated ash (ASTM D-874) of 1.00 percent maximum by weight, except lubricants that
contain only barium detergent-dispersants where 1.50 percent by weight is allowed.
Diesel lubricating oil specifications are discussed in the Cummins Handbook for Diesel Engines.
(3) Oil viscosity
The use of an SAE-30 grade oil is recommended for year-round service. The engine is equipped
with an ether starting aid to assist in engine starting during cold weather when SAE-30 oil is used.
Multi-grade oils are NOT recommended, and should be considered only as a "last resort" to
facilitate engine starting.
November 18/91 Revised
OM-2031
2-1
Page 3
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