Generac Power Systems GTH760 Service Manual page 21

TESTING THE FUEL SHUT-OFF SOLENOID
1. Remove the spark plug wires from each spark plug to prevent
accidental starting of the engine.
2. Check for 12 volts DC at the solenoid ter minal.
See Figure 3-11.
a. Place one hand on the fuel solenoid and turn the ignition switch to
the run position. You should be able to feel the solenoid actuate
as well as hear an audible click. Replace the solenoid if it does
not actuate. Some systems will delay power to the solenoid until
full oil pressure is reached during cranking.
3. I f t h e s o l e n o i d i s o p e n i n g p r o p e r l y, p r o c e e d
t o " T E S T I N G A N D
VAPORIZER/REGULATOR."
4. Reconnect the spark plug leads when finished
12 VOLT WIRE
Figure 3-11. LPG Solenoid Valve
DISASSEMBLY AND ASSEMBLY OF
LPG SOLENOID VALVE
If the solenoid valve is removed for cleaning or replacing the filter, it is
recommended that the special synthetic sealing gaskets be replaced.
When installing new sealing gaskets, they should be lubricated using
an O-ring lubricant. DO NOT RE-USE O-RINGS!
For improving the functional features and lifetime of the solenoid, it
is recommend that the gaskets and filter be replaced after 500 hours
of operation.
R E P A I R I N G T H E L P G
SECTION 3: CARBURETION AND FUEL SYSTEM
COIL BOLT
COIL SPOOL
RESEVOIR BOLT
Figure 3-12. LPG Solenoid Valve Torque and
Lubrication Points
NOTE: For correct solenoid valve fitting, it is essential that the
following torque values be observed:
1 Coil Bolt
2 Reservoir Bolt
3 Coil Spool:
TESTING AND REPAIRING LPG
VAPORIZER/REGULATOR
SPECIAL EQUIPMENT REQUIRED:
1. Air pressure at 100 psi, and air pressure gauge 0-15 psi, with
connecting hose and fittings to attach to the 1/8" NPT female pipe
connection.
2. Liquid leak detector to check for leaks (recommended).
REPAIR KIT CONTENTS:
(Refer to Parts Manual for specific part numbers.)
Pin, Pivot, Secondary Reg Lever
Lever, Assembly Reg Secondary
Diaphragm, secondary
Assembly. Diaphragm, primary
Assembly, Lever, Primary
Pin, Pivot, Primary
3-5
SEALING GASKET
SEALING GASKET
SEALING GASKET
SEALING GASKET
7.85 Nm (70 in. lbs.)
11.8 Nm (104 in. lbs.)
16.6 Nm (147 in. lbs.)
3