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Ferguson Tractor TO-20 Operation and Maintenance Manual

--G O V E R N O R-------l
The flyweight type governor has 4 evenly-spaced,
die-cast weights, and is attached to the front side
of the camshaft gear. It is completely enclosed
by the timing gear housing except the control
linkage (see illustration). It permits selection of
required speed by hand throttle from 400 to 2200
r.p.m., and maintains selected speed between 1200
and 2200 r.p.m. even though the load may vary.
HOW
IT
OPERA TES
Opening the hand throttle
increases the governor spring tension. This causes
the governor linkage to overcome force of the fly-
weights, opening the carburetor throttle plate
and increasing the engine speed. Such speed in-
creases give greater force to the governor's fly-
weights, which begin to overcome the spring ten-
sion and gradually close the carburetor throttle
plate. A balance is reached between the action of
the flyweights and the spring tension which is
maintained until either the load or position of
the hand throttle is changed.
Note: When the hand throttle is set for a certain
speed and the load increases, the tractor speed
tends to decrease. This reduces the force of the
governor flyweights, and the spring tension opens
the throttle plate to compensate for the increased
load. Exactly the opposite ·occurs if the load is
decreased.
SERVICING THE GOVERNOR
The governor is lu-
bricated by engine oil forced through bleeder
holes from the front camshaft bearing. It requires
no special lubrication.
The governor must have perfectly free move-
ment at all locations. Any slight binding will re-
sult in erratic action.
To
adjust
the
governor
(see illustration) :
1. Warm up engine.
2. Set main carburetor jet
from 1 to 1% turns open.
3. Set idling jet to % of a
turn open.
4. Disconnect throttle rod.
5.
With throttle lever
against idling stop, adjust
idling
screw to speed of
400-500 r.p.m.
6.
Shut off engine.
7.
Open hand
throttle
to
create tension on governor
spring.
8.
Adjust :hrottle rod
length
until
carburetor
throttle lever is 13!!-inch off
full stop.
9. Disconnect and remove
governor rod from gover-
nor spring.
10. Back off bumper spring
screw. Check governor lev-
er for free movement.
Check carburetor throttle
shaft for binding, and re-
connect throttle rod. (Pins
must fit freely and clevis
must not bind against ver-
tical arm.)
1 1 .
Set hand throttle at full
open position against steer-
ing post.
12.
Move approximately 65
degrees forward to idling
position.
13. Loosen U-bolt and tum
on torque rod until spring
hook is just touching tor-
que rod. Tighten U-bolt.
14. Check governor spring.
(Open coils indicate a
stretched spring and should
be replaced.) Spring length
is set by opening or closing
end
loop
until
spring
is
neither loose nor in tension
when in position on gover-
nor rod and against gover-
nor lever. With band throt-
tle at idling position and
throttle against
idle stop,
adjust governor rod length
until spring may be con-
nected.
15.
Start
engine.
16.
Check
engine
speed
with
hand
throttle
fully
down (see diagram). If not
between
2100
and
2200
r.p.m.,
loosen U-bolt
and
turn until correct speed is
attained. Then tighten the
U-bolt.
17. With engine operating
at
full throttle, screw in
bumper-screw
until
speed
begins to increase. Lock in
position with lock not.
18. If hand throttle tends
to
creep,
adjust
friction
disc under instrument pan-
el. (This is done by loosen-
ing the clamp, compressing
the spring and re-tighten-
ing
the
clamg.)
If
band
throttle still creeps, com-
pensating spring must be
shortened by �-inch. (Nor-
mal length of spring is 4
inches.)
Note 1. Clamp must be located so that it will not strike
battery when throttle is operated.
2. For
further
adjustments
of
governor,
see
"Trouble Shooting Section" pages 39 to 42.
3. If governor difficulties continue, see your Fer-
guson dealer.
TABLE FOR CHECKING ENGINE SPEEDS
Engine
P.T.O. Shaft
Pulley
Rear
Wheel
r.p.m., with
r.p.m.
r.p
.
m.
r.p.m.
1 wha.1 locked-1st gear
400
145
270
10.1
500
181
338
12.7
2000
727
1358
50.8
2100
763
1425
53.3
2200
800
1493
56.
To check:
Jack up one rear wheel. Place mark on
tire and count revolutions per minute with tractor
running in 1st gear.