Section 6

DIAGNOSTIC TESTS

Figure 6-32. – Tachometer

Test Bracket:

A starter motor test bracket may be made as shown in Figure 6-33.

 

 

METAL STOCK

 

 

1/4" THICK STEEL

0.5"

2.625"

 

 

 

 

 

3.5"

 

1.0"

4"

 

12"

 

DRILL TWO HOLES — 1/2"

 

FOR STARTER

 

2"

MOUNTING BRACKET

 

 

 

 

 

DRILL TWO HOLES — 1/2"

 

 

FOR MOUNTING TACHOMETER

 

 

TAP FOR 1/4-20 NC SCREWS

Figure 6-33. – Test Bracket Dimensions

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 6-34).

Testing Starter Motor:

1.A fully charged 12 volt battery is required.

2.Connect jumper cables and clamp-on ammeter as shown in Figure 6-34.

3.With the Starter Motor activated (jump the terminal on the Starter Contactor to battery voltage), note the reading on the clamp-on ammeter and on the tachometer (rpm).

 

CLAMP ON

STARTER

AMP METER

 

CONTACTOR

 

STARTER

 

MOTOR

 

TACHOMETER

 

VISE

12 VOLT

BATTERY

Figure 6-34 – Testing Starter Motor Performance

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.

TEST 26 - Test Starter Contactor

Relay (SCR)

PROCEDURE:

1.Set voltmeter to measure DC voltage.

2.Remove Wire 15 from the Starter Contactor Relay (SCR). Connect the positive meter test lead to Wire 15 previous- ly removed. Connect the negative meter test lead to frame Ground. 12 VDC should be measured. Reconnect Wire 15 to the SCR. If 12 VDC is NOT measured on Wire 15 Stop Testing and repair or replace Wire 15 between the Fuse (F1) and the SCR.

3.Remove Wire 13 from the Starter Contactor Relay (SCR). Connect the positive meter test lead to Wire 13 previous- ly removed. Connect the negative meter test lead to frame

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Guardian Technologies 4451 & 4986, 4583, 5308 Test 26 Test Starter Contactor Relay SCR, Set voltmeter to measure DC voltage
Page 52 Page 54

5308, 4583, 4451 & 4986, 4582 & 4987 specifications

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