Generac Power Systems 65 TEST 28- CHECK FUEL SUPPLY, 24.– Tachometer, Section DIAGNOSTIC TESTS

Section 7

DIAGNOSTIC TESTS

Figure 7-24. – Tachometer

TEST BRACKET:

A starter motor test bracket may be made as shown in Figure 7-25.

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 terminal 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.

Figure 7-26. – Testing Starter Motor Performance

TEST 28- CHECK FUEL SUPPLY

DISCUSSION (GASOLINE MODELS):

If the engine cranks but won't start, don't overlook the obvious. The fuel supply may be low. Many RV gen- erator installations “share” the fuel tank with the vehi- cle engine. When such is the case, the Installer may have used a generator fuel pickup tube that is shorter than the vehicle engine's pickup tube. Thus, the gen- erator will run out of gas before the vehicle engine.

PROCEDURE:

Check fuel level in the supply tank. Attach a fresh fuel supply if necessary and restart. Fuel may be stale, causing a hard start.

RESULTS:

1.If necessary, replenish fuel supply.

2.If fuel is good, go to Test 29 (for Problem 7, Section 6). Go to Test 32 for Problem 8 (Section 6).

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