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OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
b. Cartridge Installation (See Fig. 4)
(1) Carefully install the new cartridge into the housing. Avoid bumping the cartridge tubes against
the housing sealing flange. Seat the cartridge properly within the housing. Press all edges and
corners of the cartridge firmly with fingers to effect a positive air seal against the sealing flange of
the housing.
CAUTION
(2) Lock the cartridge in place by installing the baffle assembly (3) and clamp assembly (2) with cup
assembly (1) in place. Tighten clamp (2) down in place.
5. Engine Fuel
a. Quality
The quality of fuel oil used in the diesel engine is a major factor in long engine life and performance.
Fuel oil must be clean, completely distilled, stable, and non-corrosive. Only distillate fuel No. 1d is
recommended for use both summer and winter.
CAUTION
6. Generator Maintenance
The 400-Hz generator requires no maintenance or service other than periodic cleaning. The unit is
brushless, and bearings are permanently lubricated and sealed.
a. Cleaning
The generator may be cleaned by careful use of compressed air and/or a good, SAFE commercial
cleaner. Steam cleaning of the generator is not recommended because steam and harsh chemical
compounds may damage insulation and other generator components.
WARNING
b. Adjustment
The generator itself requires no adjustment. Adjustment procedures for generator controls are
covered in Section 2-3.
7. Drive Belts
To check V-belts, it is necessary to remove rear access panel cover on left side of canopy. The engine
cooling fan is driven by a matched set of V-belts. The 12 V-DC alternator is driven by a single V-belt.
a. Fan Belts
No adjustment is necessary for fan belts. Proper tension is maintained on these belts by the idler
pulley (Section 1-1, Item 10, Fig. 4).
b. Check Belt Tension
Check tension by pressing the thumb (Fig. 6) midway between the pulleys. Maximum allowable
inward deflection of this belt is 15mm (0.6 in.)
February 28/94 Revised
Under no circumstances should the cartridge be pounded or struck in the center
to effect a seal.
Consult the "fuel oil selecting chart" in the engine operator's manual before
substituting another grade of fuel.
Electric shock and fire can kill or injure! Be sure the unit is completely dry
before operating. Do not use a flammable solvent.
Chapter 2-1
Page 9
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Troubleshooting
