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Generac Power Systems Recreational Vehicle Generator 5413 User Manual

Page 52

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Figure 7-23. – Clamp-On Ammeter

TACHOMETER:
A tachometer is available from your Generac Power

Systems source of supply. Order as P/N 042223. The

tachometer measures from 800 to 50,000 RPM (see

Figure 7-24).

Figure 7-24. – Tachometer

TEST BRACkET:
A starter motor test bracket may be made as shown in

Figure 7-25.

METAL STOCk
1/4" THICk STEEL

12"

1.0"

4"

2"

2.625"

3.5"

0.5"

0.5"

DRILL TWO HOLES — 1/2"
FOR STARTER
MOUNTING BRACkET

DRILL TWO HOLES — 1/2"
FOR MOUNTING TACHOMETER
TAP FOR 1/4-20 NC SCREWS

Figure 7-25. – Test Bracket

REMOVE STARTER MOTOR:
It is recommended that the Starter Motor be removed

from the engine when testing Starter Motor perfor-

mance. Assemble starter to test bracket and clamp

test bracket in vise (Figure 7-26).

TESTING STARTER MOTOR:
1. A fully charged 12 volt battery is required.
2. Connect jumper cables and clamp-on ammeter as

shown in Figure 7-26.

3. With the Starter Motor activated (jump the termi-

nal on the Starter Contactor to battery voltage),

note the reading on the clamp-on ammeter and

on the tachometer (rpm).

Note: Take the reading after the ammeter and

tachometer are stabilized, approximately 2-4

seconds.
4. A starter motor in good condition will be within the

following specifications:

Minimum rpm

4500

Maximum Amps

50

Note: Nominal amp draw of starter in generator is

60 amps.

STARTER

CONTACTOR

STARTER

MOTOR

TACHOMETER

12 VOLT

BATTERY

CLAMP ON

AMP METER

VISE

Figure 7-26. – Testing Starter Motor Performance

Page 50

Section 7
DIAGNOSTIC TESTS