TESTING AND ADJUSTING
LOWER SPEED SETTING
SPEED SETTING BELLOWS AND LEVER
There is an index mark (notch) 0.76 mm (.030
in.) deep on the outer face of the bellows flange. The
index mark is approximately mid range position when it is
turned to the front of the governor (when facing the
governor name plate).
HIGHER SPEED SETTING
With the index mark to the left side of the
governor (as seen from governor nameplate), the
bellows is farther away from the pivot pin. The lever arm
is now longer and engine speed is increased for a given
amount of air pressure.
SPEED SETTING CONTROL
1. Air inlet port. 2. Feedback spring. 3. Pivot.
Control air pressure enters the bellows through
air inlet port (1) at the top of the flange. Control air
pressure expands the speed setting bellows, which
pushes down on the lever at the left of pivot (3), raising
the right end of the lever against feedback spring (2).
The force of the feedback spring is marked on the end of
When the bellows is turned, the eccentric
changes the position of the bellows on the speed setting
lever. This changes the length of the lever arm. The
lever arm is the distance from pivot (3) to the outer edge
of the bellows.
When the bellows is turned with the index mark
to the right side of the governor (counterclockwise as
CONNECT PRESSURE REGULATOR AND GAUGE
seen from governor nameplate), the bellows moves
closer to the pivot pin. This makes the lever arm shorter
and lowers engine speed for a given amount of air
Before the control adjustment can be made,
install n pressure regulator and gauge assembly in the
control air supply line. Also, connect a tachometer with
good accuracy to the engine.