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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
TA P 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