Guardian Technologies 4451 & 4986 Manual De Usuario

3. A defective Starter Motor switch.

4. Broken, damaged or weak magnets.

5. Starter drive dirty or binding.

PROCEDURE:
The battery should have been checked prior to this

test and should be fully charged.
Set a voltmeter to measure DC voltage (12 VDC).

Connect the meter positive (+) test lead to the Starter

Contactor stud which has the small jumper wire con-

nected to the Starter. Connect the common (-) test

lead to the Starter Motor frame.
Set the Start-Stop Switch to its START position and

observe the meter. Meter should Indicate battery volt-

age, Starter Motor should operate and engine should

crank.

RESULTS:
1. If battery voltage is indicated on the meter but Starter Motor did

not operate, remove and bench test the Starter Motor (see fol-
lowing test).

2. If battery voltage was indicated and the Starter Motor tried to

engage (pinion engaged), but engine did not crank, check for
mechanical binding of the engine or rotor.

NOTE: If a starting problem is encountered, the

engine itself should be thoroughly checked to

eliminate it as the cause of starting difficulty. It is

a good practice to check the engine for freedom

of rotation by removing the spark plugs and turn-

ing the crankshaft over slowly by hand, to be sure

it rotates freely.

WaRning!: Do not Rotate engine WitH

electRic staRteR WitH spaRK plugs
ReMoveD. aRcing at tHe spaRK plug
enDs MaY ignite tHe gasoline vapoR
exiting tHe spaRK plug Hole.

Figure 6-29. – Starter Motor (SM)

CHECKING THE PINION:
When the Starter Motor is activated, the pinion gear

should move and engage the flywheel ring gear. If the

pinion does not move normally, inspect the pinion for

binding or sticking.

PINION

Figure 6-30. – Check Pinion Gear Operation

TOOLS FOR STARTER PERFORMANCE TEST:
The following equipment may be used to complete a

performance test of the Starter Motor:
•  A clamp-on ammeter.
•  A tachometer capable of reading up to 10,000 rpm.
•  A fully charged 12 volt battery.

MEASURING CURRENT:
To read the current flow, in AMPERES, a clamp-on

ammeter may be used. This type of meter indicates

current flow through a conductor by measuring the

strength of the magnetic field around that conductor.

Figure 6-31. – 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 6-32).

section 6
Diagnostic tests

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