6-10
Adjusting High-Idle Speed
WARNING
This adjustment involves operating
the genset with enclosure panels removed that
guard against moving parts that can cause se-
vere personal injury or death. Keep your hands
away from the engine belt and pulleys.
High-idle speed must be checked each time an ac-
tuator base is reinstalled or replaced. For an initial
adjustment when installing a new base, (to make
sure the engine stops when the actuator is deener-
gized), turn the high-idle speed adjusting screw in
until the head of the screw is 3/4 inch (19 mm) from
the base (Figure 6-8).
Note: Be prepared, if necessary, to clamp off the sup-
ply
and return
fuel lines to stop the engine.
1. Adjust the speed control lever stop
(Page 6-9).
2. For this test, measure engine speed with a
strobe or injector clamp-on type tachometer.
3. Remove the front and top access doors
(Page 5-1) and loosen the front / left side panel
assembly so that it can be swung to the left for
access to the speed adjusting screw.
4. Disconnect the actuator leads and connect a
12 volt battery to the actuator terminals
using a
battery switch
. (The battery will hold the gover-
nor mechanism against the high speed stop
and allow the engine to run after shutdown—
probably Code No. 15.)
CAUTION
The actuator could overheat if
the battery is left on more than 10 minutes.
5. When ready, switch the battery on, start the
genset, measure engine speed (rpm)
and stop
the engine by switching off the battery.
6. Readjust high-idle speed, as follows, if not be-
tween 3300 and 3400 rpm:
A. Loosen the lock nuts on the two bottom
screws and back out the clamping screw.
B. To increase speed, turn the speed adjust-
ing screw in 1 turn (clockwise). To de-
crease speed, turn it out 1 turn (counter-
clockwise).
7. Repeat Steps 5 and 6 until high-idle speed is
between 3300 and 3400 rpm. Set the lock nut.
8. Run the clamping screw in by hand until snug,
back it out 1-1/2 turns and set the lock nut.
SPEED
ADJUSTING
SCREW
CLAMPING
SCREW
3/4 inch
19 mm
FIGURE 6-8. HIGH-IDLE SPEED SCREW
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Summary of Contents for MDKBH Series
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