ADJUSTMENT AND OPERATION
13-6
1.5.2
Setting low idle speed (setting minimum no-load speed)
&$87,21
If there is a speed range that torsional vibration may
occur, avoid the speed range. If the idle sub-spring is
turned clockwise too much, the engine may overrun
during no-load, high-speed operations. Be careful
about this when adjusting the engine speed.
(1)
To let the engine operate at the minimum no-load
speed, place the speed control lever at a fixed position
and adjust the low idle speed setting screw.
Note: Turning the low idle speed setting bolt clockwise
increases the speed.
(2)
If the engine speed does not stabilize, turn the idle sub-
spring adjusting screw clockwise so that the idle sub-
spring can lightly contact with the tension lever, then
the engine speed will be stable.
Setting low idle speed
Adjusting engine speed stability
1.5.3
Setting rack (setting maximum output)
(1)
Hold the speed control lever at the specified engine
output and speed position. In this condition, check if the
engine output and speed are stable.
(2)
While maintaining the engine in the stabilized
condition, adjust the full-load stopper bolt. Tighten or
loosen the full-load stopper bolt to find the position
where the rated output is attained.
(3)
When the rated output position is approximately
determined, tighten the full-load stopper bolt, and then
turn it counterclockwise by degrees. At the position
where the engine speed is about to drop below the rated
speed, stop turning the full-load stopper bolt, and lock it
securely with the lock nut. Make sure that the speed
control lever is in a high-speed side position.
(4)
Turning the full-load stopper bolt clockwise increases
the fuel injection (engine output increase), and turning
it counterclockwise decreases the fuel injection (engine
output decrease).
Setting rack
Low idle
setting bolt
Idle sub-spring
adjusting screw
