ENGINE REPAIR INSTRUCTIONS
Section I. ENGINE ACCESSORIES
This section contains those items which are
considered accessories to the engine. They con-
sist of the starter, battery-charging generator,
radiator, water pump, hydraulic governor, fuel
pump, blower drive, and overspeed governor.
a. General. The starter is a 24 volt, 4-
brush, gear drive type. The starter converts
the electrical energy of the batteries into the
mechanical energy necessary to crank the en-
gine. The starter incorporates an overrunning
clutch which shifts the starting motor pinion
into mesh with the flywheel ring gear.
b. Removal. Refer to Operator's Manual.
c. Bench Testing
Note. Never operate the cranking motor more
than 30 seconds at a time without pausing to allow it
to cool at least two minutes.
(1) The armature should be checked for
freedom of operation by turning the drive.
(b) Rated current draw and no-load
Tight, dirty, or worn bearings, bent armature
speed indicates normal condition of the crank-
shaft, or loose pole shoe screw will cause the
armature to drag and it will not turn freely.
(c) Low free speed and high current
draw indicates: tight, dirty, or worn bearings,
(a) Connect the cranking motor in
bent armature shaft or loose pole shoes al-
lowing armature to drag, shorted armature,
series with a fully charged battery to provide
24 volts, an ammeter capable of reading sev-
grounded armature or fields.
(d) Failure to operate with high cur-
eral hundred amperes, and a variable resist-
rent draw indicates a direct ground in the
ance. Also connect a voltmeter as illustrated,
from the motor terminal to the motor frame.
terminal or fields.
(e) Failure to operate with no current
An rpm indicator is necessary to measure ar-
draw indicates an open field circuit, broken
mature speed. Proper voltage can be obtained
brush springs, worn brushes, high insulation