If readjustment of the governor gap is
required,
the position of the injector
racks must be rechecked.
Adjust idle Speed
With the maximum no-load speed properly
adjusted, the idle speed may be adjusted
as follows:
1. Place the speed control lever in the
idle position and the stop lever in the
run position.
2. With the engine running at normal op-
erating temperature, back out the buffer
screw to avoid contact with the differen-
tial lever.
3. Loosen the lock nut and turn the idle
speed adjusting screw until the engine is
operating at approximately 15 rpm below
the recommended idle speed.
The recommended idle speed is 500-600
rpm but may vary with the engine appli-
cation.
4. Hold the idle speed adjusting screw
Shims
and tighten the lock nut.
3. Refer to the following table and de-
termine the stops or shims required for
Adjust Buffer Screw
the desired full load speeds.
With the idle speed set at approximately
15 rpm below the recommended idle
speed, the buffer screw may be set as
follows:
1. Turn the buffer screw in until the
engine is operating at the recommended
idle speed. Do not raise the engine
speed more than 15 rpm with the buffer
screw.
4. Install the variable speed spring hous-
ing and recheck the maximum no-load
2. Hold the buffer screw and tighten the
lock nut.
speed.
5. If required, add shims to obtain the
necessary operating speed.
Adjust Booster Spring
NOTE
With the engine idle speed set, adjust
the booster spring as follows:
If the maximum no-load speed is
raised or lowered more than 50 rpm
1. Move the speed control lever to the
by the installation or removal of
idle speed position.
the governor shims, the governor
gap should be rechecked.
and loosen the booster spring retaining
nut on the speed control lever. Loosen
the lock nuts on the eye bolt at the op-
posite end of the spring.
Engine Tune-Up
11H-7
