Generac Power Systems GTV99O Service Manual page 17

SECTION 2: IGNITION
SECTION CONTENTS
PAGE
sPEClFlCATIONS..................
-..... --------------....-.... 2-1
GENERAL
lNFORMAT|ON..... ...........................................
2-1
ARMATURES
Armatur€Testing................-.....................----..-.........2l
Removing
Amatures ........................-.......................
2_1
lnstall Armatures -................ .....................................-.
2-1
Adjusi Armaturc Air Gap ..........................................
2-2
FL\1/VHEEL
Remove Flywheel ..-...................................-...............2_2
lnspect Flylvheel Key and Keylv ays ...........-................
2"2
lnstallFlylvhee1..........................................................2_3
ENGTNE
WtRTNG HARNESS .....................-...................... 2-3
Tesling Grcund Wircs............................................-...
2-3
Engine wirlng Harness
Diagram ................................ 2-4
Diode Failurc Diagnosis
...-.--..................................... 2-4
SPECIFICATIONS FOR
GW-990/760
0HVt V-TW|N ENGINE
MODEL 5ERLE5 ................................................Gry-990t60
ARMATURE AIR GAP.....................................008',
TO .012'
(.20TO.30 MM)
FLYWHEEL NUI TORQUE
n: 185..........--......................
.. .. - - .......150
FL\1/VHEEL NUT TORQUE
NM............__.......................................-......................203.0
See Section 1 For Spatk PIug MainFnan.e And Spe<ifi<ations
GENERAL INFORMATION
Generac GTV-990,60 OHVIV-Twin engines use a magneto
ignltionr an ignition amalure with a seli-contalned transistor
module (no moving paats). Two magneto ignition arrnatures
are used, with a flyljvheel containing a permanent magnet.
NOTE: fhe magneto ignition synem rcquires a minimum
of 350 RPM to ptoduce a consistent spa*.
ARMATURES
ARMATURE TESTING:
The condition of lhe ignition armatures can be accu€tely diag'
nosed using an ignition testet, (Generac P/N 0C5969) as
desc bed in 'Trcubleshoot n9' in Section 1.
REMOV NG ARMATURES:
1. Remove spark plug leads.
2. Remove intake manifod and covel intake pofts.
3. Remove rotating screen and blower housing.
4. Remove armature screws and lift off armature(s),
Figure 2-1.
a. Disconnect stop swltch wires at armatures.
Note:The flwheel does not need to be rcmoved to ser-
vice ignition except to check the flwheel ket.
INSTATL
ARMATURES:
1- Turn fylvheelso magnet is away frcm amatur€.
2. Install ground wire onto tab terminalon armature.
Note: Make sure wires are routed over afinature mount-
ing posB and away lrcm flwheel.
figute 2-2. Ins|.jrlling Anaturc
3. Assembe armature to engine, Figurc 2-2.
a. Mounting holes in armature are slotted, Push armature
away from fly\,vheel as far as possible and tighten one sc€w
to hold afmaturc in place.
Figurc 2-1. Renoving Amature
2-1