Kohler COMMAND CH18, Service Manual

Page: 43 / 232

5.10
Section 5
Fuel System and Governor
NOTE: The choke and throttle plate assemblies
are staked and matched to the shafts at
the factory. They are not serviceable
items.
Always use new gaskets when servicing or
reinstalling carburetors. Repair kits are available
which include new gaskets and other components.
These kits are described on the next page.
Reassembly
Reassemble the carburetor using the following steps.
See Figure 5-11.
1. Assemble the fuel inlet needle to the float tab.
Install the float, float shaft and inlet needle to the
air horn. Tighten the screw. Check float height
using the procedure found previously in the
‘‘Adjustments’’ subsection.
2. Install the slow jet with the stepped end toward
the bottom of the carburetor. Make sure jet is
fully seated.
3. Install the low idle adjusting needle and spring.
4. Assemble the upper body onto the lower
carburetor body using the four screws. Torque
the screws to
1.7 N·m (15 in. lb.) .
5. Install the carburetor on the engine following the
procedures in Section 11 – ‘‘Reassembly.’’
1. Carburetor Upper Body (Choke)
2. Self-relieving Choke
3. Body Gasket (Formed Rubber)
4. Slow Speed Jet
5. Inlet Needle Valve
6. Clip
7. Float Pin
8. Float Assembly (Kit)
9. Carburetor Lower Body (Throttle)
10. Main Jet
11. Idle Fuel Adjusting Needle (some models)
12. Solenoid Seat
13. Fuel Shut-off Solenoid (Kit)
14. Idle Speed Adjusting Screw
15. Jet (Accelerator Pump Carburetor only)
16. Accelerator Pump Cover
17. Diaphragm
18. Diaphragm Spring
19. O-Ring
20. Rubber Boot
21. Bushing
22. Return Spring
Accelerator Pump Version Only
1
2
3
4
15
8
5
6
7
9
10
12
14
13
19
17
18
16
21
20
22
19
# See Note on Page 5.11
11
Figure 5-11. CH18-740 Carburetor – Exploded View.