Generac Power Systems 7 kW NG Repair Manual page 123

ENGINE/DC CONTROL
If engine turns over slightly, go to Test 63 "Check and Adjust
Valves." If valve clearance is too loose the valves will not fully
open which could slow down cranking of the engine.
Figure 116. Starter Motor (V-Twin Engines)
Figure 117. Starter Motor (Single Cylinder Engines)
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.
Figure 118. Check Pinion Gear Operation (V-Twin)
PART 4
PINION
Figure 119. Check Pinion Gear Operation (Single Cylinder)
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 120. Clamp-On Ammeter
Tachometer:
A tachometer is available from your parts source. The
tachometer measures from 800 to 50,000 rpm, (see Figure
121).
Section 4.5
Diagnostic Tests
PINION
Page 121