Onan NHC User Manual

Adjustments
GOVERNOR
Carburetor mixture adjustments are set for maximum
efficiency at the factory. Idle fuel adjustment is restricted
to 1/4 of a turn by a limiting cap. There is no main fuel
adjustment screw. If adjustments seem necessary, first
be sure the ignition system is working properly and is
not the source of the problem.
If adjustment is needed, refer to Figures 6 and 7 and
proceed as follows:
1. Start the engine and allow it to warm up thoroughly
(at least 10 minutes).
2. Some equipment manufacturer’s may require higher
throttle stop speed and governor low speed rpm
settings. Refer to equipment manufacturer’s Opera¬
tor’s Manual for the correct rpm settings. When rpm
settings are not specified by the equipment manu¬
facturer use the rpm settings listed in Steps 6 and 7.
3. Move the engine speed control to the slow position.
4. Determine if the engine has a governor low speed
adjustment screw.
5. Pull the governor back so the throttle stop screw is
against its stop. Continue to hold the governor arm
in this position while completing the adjustments
described in Steps 6 and 7.
FIGURE 7. GOVERNOR ADJUSTMENT
6. If the governor does not have a low speed adjust¬
ment screw, adjust the throttle stop screw to obtain
1200 rpm. If the governor does have a low speed
adjustment screw, adjust the throttle stop screw to
obtain 1100 rpm.
7. Engines without a governor low speed adjustment
screw require no further low speed adjustments.
Engines with a governor low speed adjustment
screw require the following low speed adjustments:
A. Check to see that the governor linkage moves
freely and is not binding.
B. Adjustthe governor low speed adjustment screw
to obtain 1200 rpm.
FS-1406-2
FIGURE 6. CARBURETOR ADJUSTMENT
TO

Onan NHC Specifications

General

Brand	Onan
Model	NHC
Category	Engine
Language	English