Radiator; Air Cleaner; Generator - Hobart 90CU24 Operation And Maintenance Manual

OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets

(4) Radiator

The radiator is a one-piece type designed for long periods of operation without servicing.
Refer to Section 2-1 for servicing procedure.

(5) Air cleaner

The diesel-engine air cleaner (fig. 4) is so constructed that air enters through its cylindrical body,
and then is filtered in the process before being passed onto the engine turbo-charge assembly.
An air cleaner service indicator device is mounted on the air cleaner assembly to monitor air flow
in the air cleaner. As the air cleaner becomes filled with dust, dirt, and carbon, the intake system
air flow becomes increasingly restricted. This restriction causes a diaphragm inside the indicator
to move toward an electrical contact. When the maximum allowable restriction level is reached,
the circuit closes and the air cleaner indicator light (6, Fig. 5) on the engine-generator control
panel is illuminated to warn the operator that the air cleaner must be changed. The electrical
indicator automatically resets after a new air cleaner is installed.
Service Indicator
Air Cleaner
f. Generator
The 400 Hz generator is a brushless, revolving field, three-phase, alternating current type. The
generator set covered by this manual is a dual-bearing type. The front end of the rotor shaft
extends forward beyond the front bearing and is attached to the engine flywheel by a flexible
coupling assembly. The rear end of the rotor shaft extends rearward beyond the rear bearing
and into the exciter stator housing. The exciter rotor is mounted on this shaft extension with a
key and is secured by a washer and 1/2"-13 thread cap screw. A rectifier with three diodes is
mounted on the exciter rotor and converts exciter AC output to DC for excitation of the generator
revolving fields. The exciter DC output to the generator fields, and consequently the generator
output, is controlled by the amount of DC voltage supplied to exciter fields by the voltage
regulator. A centrifugal, radial-blade fan which is part of the flexible coupling assembly, draws
cooling air over all internal windings. Air enters at the exciter end and is discharged at the drive
end. The complete generator is bolted to the engine flywheel housing.
Chapter 1-1
Page 8
Air Cleaner and
Service Indicator
Figure 4
November 27/1997