MTD 584 Operations Instructions download pdf (Page 121)

Figure 4-15

NAVFAC P-8-622-12

TO-35C2-3-456-1

TM 5-6115-584-12

Section X. MAINTENANCE OF ENGINE ELECTRICAL SYSTEM

4–24.

DESCRIPTION AND FUNCTION

a. The engine is cranked by a 24 volt electric

starting motor (see figure 1–7). When starting motor

solenoid is energized, the solenoid core pulls in, shift-

ing the pinion gear into engagement with the engine

flywheel ring gear. At the same time, contacts

in the

solenoid close to provide a circuit for the starter. The

starting motor is protected from overspeeding by an

overrunning clutch. Two 12 volt batteries in series are

used. The starting switch for this starting circuit is lo-

cated in the control cubicle, A blower wheel alternator

is utilized to maintain the battery charge. The stator is

mounted on the engine block and the permanent mag-

net rotor is mounted into the air cooling system blower.

Solid state diode rectifiers convert the alternating cur-

rent generated in the stator to direct current for battery

charging.

b. Anew (Style II) gear–reduction electric starter

will be installed on engines manufactured during 1990;

and will be available as a replacement when the origi-

nal starter, (Style 1) is no longer available. The Style II

starters are interchangeable with the Style I starter.

4-25. BATTERY ASSEMBLY.

Metal objects making contact be-

tween the positive and negative

battery terminals, or between the

positive battery terminal and the gen-

erator frame can cause FIRE or

EXPLOSION . Always keep the bat-

tery terminal covers on the battery

terminals. See Figure 3-23.

a. Battery Cables (Including Jumper Cable) (see

figure 4–1 6). On ASK equipped generators, remove

BATTERIES access door.

(1) Test. Test battery cable for continuity. Re-

place any cable that does not show continuity.

(2) Remove. Remove negative battery cable

from negative (–) battery terminal. Remove positive

(+) battery cable from positive battery terminal.

Tag and disconnect cables from starter case and

starter solenoid. Remove jumper between batteries.

Clean battery, starter, and starter solenoid terminals

thoroughly and install new cables as given below.

(3) Replace. Attach jumper cable between

negative (–) terminal of one battery and positive (+) ter-

minal of the other battery. Attach positive battery cable

to the “B” Terminal stud on starter solenoid. Attach

negative battery cable (-) to the ground terminal “G” of

the starter. See figure 4-16. Attach positive cable (+)

to positive terminal on one battery and negative cable

(-) to negative terminal on the other battery. Tighten all

terminal connectors securely.

4-24

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MTD 584 Operations Instructions Page 121

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