63
Connect an accurate (AC) frequency meter to one of the
generator receptacles.
Then, complete adjustments as follows:
• Start the engine and let it run at “no-load” with the idle
control switch set to
OFF
.
The frequency meter should read approximately
62
Hertz
(on 60 Hertz units) or 51 Hertz (on 50 Hertz units). Adjust
engine governed speed, if necessary. Perform these next two
operations and take note of where these positions are.
• Turn the needle valve clockwise (lean) until engine RPM
just starts to slow.
• Turn the needle valve counterclockwise (rich) until the
engine starts to run unevenly.
• Set the needle valve midway between rich and lean.
Idle Speed Adjustment
• Set the idle control switch to
ON
.
The engine should decelerate to idle speed and the
frequency meter should read approximately
35-40
Hertz.
If necessary:
• Loosen the three screws that retain the idle
control coil bracket (Figure 3.9) and slide the
bracket axially to adjust speed to
35-40
Hertz.
To increase frequency: Slide bracket to the left.
To decrease frequency: Slide bracket to the right.
With the engine running at correct idle speed:
• Turn the idle mixture valve in (lean) until the engine
begins to roughen and then out (rich) until it roughens.
Take note of these positions.
• Set idle mixture valve midway between rich and lean.
Recheck idle speed and, if necessary, adjust by moving the
coil bracket, as before.
• Turn the idle control switch
OFF
and check
acceleration.
Engine should accelerate smoothly. If not, readjust
carburetor mixture slightly richer.
Idle Control Adjustment
(Early V-Twin Engine)
To adjust V-Twin engine units with idle control, an (AC)
frequency meter and a tang bending tool are required.
Fabricate the tang bending tool locally per Figure 3.10.
NOTE:
Use of a load bank is recommended. If a
load bank is not available, some other means of
applying a known electrical load to the generator
must be used.
Setting Idle Mixture
The following adjustments will permit the engine to be
started and warmed up. Final adjustments will be made with
the engine running.
Before starting the engine:
• Turn the idle mixture valve clockwise until it just
bottoms.
Do Not Force.
• Then, turn the idle mixture valve counterclockwise one
and one quarter turns.
Section 3 • Generator Diagnostics and Adjustments
Portable Generator Familiarization & Troubleshooting Guide
Figure 3.10 — Tang Bending Tool
Figure 3.9 — Idle Control Coil And Flapper
Содержание 86262GS
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