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GEAR SHIFTING - TRANSMISSION
The transmission has a shift lever to select the
proper gear speed for the work being done. Be-
fore shifting into any gear, place selector lever
in neutral and move the shift lever frotTI neutral
to the desired gear position.
Always stop the :fOrward motion of tractor before
changing fronl one gear speed to another. Never
attempt to shift gears
On
the go as excessive
gear clashing
ITlay
result.
To shift from
One
gear to another refer to Transmission Shift
Diagram and follow shift pattern. Never force
shift lever from one gear to another.
Transmission shift lever should always be in the
neutral position before starting engine) or before
dismounting from tractor. Gear shifting should
be made at reduced engine speed. This will make
shifting easier and reduce clashing., Increase
engine speed sufficiently to start load6 After
clutch is engaged increase engine speed to full
speed, especially on loads.,
SHUTTLE CLUTCH - HYDRAULICALLY
OPERATED
This clutch is provided as standard equipment fo r
industrial tractors to control the forward and re-
verse rrnvement of tractor in any selected gear
~
To operate gear ranges, with clutch control lever
in the neutral position, shift transmis siGn into the
desired gear range and move selector lever to
desired position.
To engage forward travel, move control to the
forward position. To reverse direction of travel
rnove control rearv..'ard. To stop travel in either
direction, move lever n1.idway and latch in the
neutral position. Apply brakes and shift trans-
mission to neutral before dismounting from
tractor.
In general, the speed range should be used which
will give fastest travel speed.
When the tracks stall, the output shaft of torque
converter is stationary. Stall periods, or opera-
tion near stall point of torque converter, should
be avoided except for very short periods to pre-
vent excessive heating of torque converter fluid.
Remember, with the torque converter it is no
longer possible to estimate the load on tractor
by lugging of the engine; selection of proper
speed depends on speed range which allows
tractor to work at its ma>...-imum efficiency.
The
operator will quickly acquire the experience
necessary to select the proper speed range to
allow tractor to work at its full capacity.
28
I
VVARNING
BEFORE :>!$MOUNTING.
SHIFT TRANSMISSION
AND SHuTTLE CLUT
eM
!NTO fIJ£UTRAL. LOCK
SHUTTl..E.'
C~.UTCH
A/<!D
80TH BRAK ES .
<AST
-..,
IS'mow,,".
H
r
u
T
T
H
l':
R
0
E
kI£LJTRAL.
T
C
1
l' :
L
E
u
T
S:"'OMf
0
C
H
Rtll£RSE
TRANSMISSION
SI-IIl="T
PATTERN
I
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3 :
:
I
-"jJ:
.
I
L2
~----
_ _ FIG. 33 _ _ _ _ _ _ _ -'
DOWN HILL OPERATION
The H -4 and HD-4 tractors may be operated
down steep hills safely. The following precau-
tions are noted. These units are equipped with
torque converters and hydraUliC operated shuttle
clutch. Their is therefore nO mechanical connec-
tion between the engine and power transmission.
The torque converter does provide braking action
when the output shaft from the converter exceeds
the engine speed by 100/0. It is therelbre possible
to obtain braking action by placing transmis sian
in
low gear (1st) and operate engine at a low
RPM.
CAUTION: Tractor engine must be running at
all times for braking action.
This is to provide
pressure to the hydraulic operated clutch for
engagernenL
DEGREE SLOPE OPERATION
The H-4 gasoline tractor will operate to a slope
of
2i>
without any affect to carburetion Or engine
oil supply. The HD-4 tractor will operate safely
to 30°.
Operation on slopes is lirnlted to 30
0
to tractor stability.
STEERING OF TRACTOR
The tractor is steered
by
disengaging the steerin.g
clutch on the side of the tractor toward which the
turn is to be made.
This is done by using the
steering levers located directly in front of the
operator.
To make a right turn, pull back the
R.H. steering lever; to make a left turn, pull
back the L. H. steering lever.
With the 1 eft
steering clutch disengaged) power is not delivered
to the left track and the track will slow down or
stop. Since power is still being delivered to the
right track, the right track will keep turning and
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