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OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
Section 1. Maintenance
1. General
To ensure the generator set is ready for operation at all times, inspect and maintain it regularly and
systematically. Locate and correct problems before they result in serious damage or failure of the
equipment.
WARNING
2. Inspection
A periodic inspection schedule should be established and maintained. A suggested inspection/check
schedule is provided in Section 2-2, Figure 1. However, it may be modified as required to meet varying
operating and environmental conditions.
3. Lubrication
a. General
Lubricating the equipment is one of the most important steps in good maintenance procedures.
Proper lubrication is the use of correct lubricants and adherence to a proper time schedule.
Lubrication points, frequency, and recommended lubricants are indicated in Fig. 1.
b. AC 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 and quiet operation.
d. Trailer
The trailer illustrated as Figure 2 is a standard four-wheel trailer. For 5th-wheel type trailers used on
some of the generator sets covered by this manual, refer to TO-180 in Chapter 5.
On either four-wheel or 5th wheel trailers, most lubrication points, such as spring shackle bolts, tie
rod ends, etc. are equipped with high-pressure lubrication fittings.
February 28/94 Revised
Electric shock, flying parts, or fire can kill or injure! Stop operation immediately if
a serious or possible dangerous problem exists.
Chapter 2. Servicing
Chapter 2-1
Page 1
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