Engine Controls And Governor - Allis-Chalmers HD-9 Service Manual

SECTION VI- ENGINE CONTROLS AND GOVERNOR
Topic Title
Throttle and Engine Shut-Off Controls
Topic No.
1
Governor
2
1. THROTTLE AND ENGINE SHUT·OFF CONTROLS
A. Description
The throttle operating lever is used to regulate the
speed of the engine. Throttle control rods and link-
age connect the throttle operating lever with the
variable speed control lever on the governor. The
engine runs at full governed speed when the throt-
tle operating lever is pu lied all the way back and
runs at idling speed when the th rattle operating
lever is pushed all the way forward.
The throttle operating lever is located on the shaft
of the throttle assembly, which is mounted on a
brocket welded to the cowl. The throttle assembly
is connected to the governor variable speed con-
trol lever by two (2) control rods having adjustable
yokes. The throttle assembly consists of a shaft and
drum, friction band assembly, housing, and covers.
The friction bond, which is assembled around the
drum, acts as a broke and holds the throttle op-
erating lever in any 8esired position, therefore, on
infinite range of engine speed can be obtained be-
tween idle and wide open. The friction band as-
sembly is provided with an adjusting capscrew for
adjusting the tightness of the band on the drum for
ease of throttle operation.
The engine shut-off rod opens and closes an air
shut-off valve in the blower air inlet elbow and
also moves the governor fuel shut-off lever to its
open and closed positions. When the engine shut-
off control knob is pU1;hed in (forward) as for as
it will go (running position), the air shut-off valve
and the governor fuel shut-off lever are moved to
their full open position. When the engine shut-off
control knob is pulled out (back) as for as it will
go, the air shut-off valve and the governor fuel
shut-off lever are moved to their closed position.
B. Adjustment of Engine Shut.Off
Controls
If the engine shut-off controls foil to operate prop-
erly, make certain the linkage and the levers are
properly lubricated and the condition is not due
94
to binding in the linkage or to broken springs.
1. Push the engine shut-off control knob into
running position (all the way in) and check
the air shut-off valve swivel lever to see if it
is moved back and contacts its stop (boss)
on the blower air inlet elbow. If not, check
and make certain the shut-off control knob
Fig. f - Throttle Assembly and Engine
Shut-IOff
Control Knob location
is not striking the cowl.
If
the knob is strik-
ing, adjust the shut-off rear rod by turning
it out of the yoke as necessary. If the air
shut-off valve swivel lever still does not con-
tact its stop, shorten Or lengthen the shut-
off front rod by turning it in or out of the
yoke as necessary. loosen the bolt in the
stop clamp on the shut-off rear rod and pull
the rod back as for as it will go. Push the
shut-off rod forward 1/16", move the stop
clamp back on the rear rod so that it con-
tacts the cowl, and tighten the stop clamp
bolt. With the stop clamp in this position, it
will prevent the air shut-off valve from bot-
toming in the blower air inlet elbow when
the shut-off control knob is pulled back to
stop the engine.