Generac Power Systems GTH760, Service Manual

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3-2
SeCTIoN 3: CArbureTIoN ANd Fuel SYSTeM
CHOKE
LINK
Figure 3-5.
6. Remove choke link (Figure 3-5), throttle link (Figure 3-4)
and fuel shut-off solenoid wire from carburetor.
7. Slide carburetor off mounting studs.
CArbureTor CleANING
For cleaning purposes, the carburetor's float bowl may be
removed. It is recommended that all jetting be left in place
while cleaning the carburetor. Be sure to use a cleaner that
won't damage rubber, neoprene, or plastic parts.
Note: The left and right main jets are different sizes.
If the fuel-shutoff solenoid is suspected of being faulty, it is
replaceable by simply unthreading it from the float bowl, and
installing a new one in its place. It can be checked by apply-
ing 12 volts to it. If you hear it click, it is most likely working
properly. If there is anything else wrong with the carburetor,
it is recommended that the entire carburetor be replaced with
a new one.
Note: Be careful not to lose the spring that is
located inside the fuel shutoff solenoid when
removing the plunger.
CArbureTor INSTAllATIoN - verTICAl SHAFT
1. Slide new carburetor gasket and carburetor onto the
studs.
2. Slide new plenum gasket and plenum onto the studs.
3. Install the nuts on the four studs, and torque to
5.4 Nm (48 in. lbs.).
4. Connect the fuel line and clamp.
5. Using a pliers, reassemble the balljoint on the carburetor.
6. Connect the breather tube.
7. Connect the fuel-shutoff solenoid.
PLENUM
MANIFOLD
PLENUM
GASKET
CARBURET
OR
GASKE
T
Figure 3-6.
8. Reinstall choke link on carburetor and clip the link into
the bellcrank.
9. Perform a static governor adjustment. (See “Static Gov-
ernor Adjustment”, page 4-2)
10. Start engine and allow to warm up for 5 minutes.
11. Move speed control lever to slow speed position and hold
throttle lever against idle stop screw.
12. Adjust stop screw to maintain ~1800 RPM idle.
13. Slowly move speed control lever to high speed position.
Figure 3-7.
Note: The high speed screw may need adjusting to reach
the speed control stop without exceeding 4000 RPM.
14. With the speed control in the high speed position, adjust
the high speed screw to obtain the desired engine speed.
Do not exceed 4000 RPM.