Marathon Electric PANCAKE GENERATOR - Mounting Procedures

a.
DO NOT obstruct the generator intake and outlet
air passages.
b. Provide sufficient air circulation around the set to
remove engine heat and to provide ample generator
cooling.
c. Hot air from the radiator or engine should not
pass through the generator.
d. Check the mounting surface to be sure that it is rigid
enough to keep vibration and noise to a minimum.
Mounting
Mount the generator to the driver securely. Before
tightening hold-down bolts, use shims as necessary
under generator feet for uniform support. If this is not
done, the frame may become distorted resulting in excess
vibration that could damage the generator.
Assembly of a Single Bearing Generator to an Engine
To mount a single bearing generator to an engine (See
Figure 1 for component identification):
a. If the engine is equipped with electric start,
disconnect the positive (+) terminal from battery.
b. Place a jack or other support under the engine
flywheel housing.
c. Remove the pot cover or control box cover from
back of generator and disconnect all incoming power
leads.
d. Detach main rotor leads from the red and black
threaded studs on rectifier assembly (See Figure 2
on page 9.
e. Remove exciter armature (rotor) mounting bolt from
center of shaft, marking position of the rotor to aid in
re-assembly.
f. Remove exciter rotor from the shaft.
Take care not to damage the laminations or coil
end turns.
g. Remove exhaust screen band.
h. Place a strap around generator rotor assembly
and support from hoist.
i. With the exciter armature removed, pull the rotor
assembly from the frame.
Do not scratch or cut the copper stator windings.
k. Insure that the flex discs are flush (flat) against the
register of the flywheel. Bolt drive disk to engine
flywheel, using proper sized flat washers and SAE
grade 8 bolts. Consult engine manufacturer for
proper torque value.
I. Push generator frame assembly carefully back
over rotor.
m. Mount frame assembly to engine flywheel housing
with proper size bolts, lock washers, and nuts.
Figure 1- General Arrangement
POT
COVER
EXCITER
ROTOR
RETAINING
BOLT
EXCITER
STATOR
BEARING
BRACKET
MAIN
ROTOR
DRIVE
DISKS
FAN
MAIN
ROTOR
LEADS
SCREEN
BAND
ASSEMBLY
FRAME & MAIN
STAOR ASSEMBLY
3