DTC TIRE MATCHING
The DTC tractor is designed
so
that, with the front axle
engaged, the peripheral speed of the front wheels is
slightly faster than the rear wheels. This causes the
front wheels to pull, thereby increasing traction and
pulling ability. However, the amount
of
this slip (over-
speed)
is
very critical. Too much or too little slip will
cause reduced efficiency, reduced pulling ability, and
possible drivetrain damage.
The tires on the tractor affect the amount of slip. The
OEM tires are matched to provide 1-3% slip. The actual
allowable slip is 0-4%, but by matching to 103%, an
allowance is built in to compensate for tire wear, over/
under-inflation, changes in load, etc. As is easily seen,
the range for slip is very small. Unfortunately, it takes
very little change in the size of a new tire to destroy the
match. In fact, a tire with a static loaded radius
as
little
as 1/4 inch larger than the OEM tire will not match.
There fore, when replacing tires, it is important that the
replacement tire be of the same size, brand, and line as
the OEM tire. All tires marked with the same size and
type code, even from the same manufacturer, are not
the same size. For example, one manufacturer offers
three different tires marked
16.9x
28, R1. There
is
a 1.6
inch difference in the static loaded radii among these
three tires, even though the tire marking shows them to
be the same.
If for some reason an exact replacement tire is not
available, the tire match must be checked to find a
suitable replacement.
The
tire match equations is
given below:
, Sl"
1
OO
{ F/R Tire Ratio }
~0
IP
= X 1 -
FIR Gear Ratio
{
Rev/Mile (Front) }
Where: FIR Tire
Ratio=
Rev/Mile (Rear)
and FIR Gear Ratio = 1.3915
The Rev/Mile data are available from your tire dealer.
Make sure that the data is for the exact tires under
consideration. If you need assistance matching tires,
contact your LONG dealer.
15
THREE POINT HITCH
The three point hitch provides a way to attach imple-
ments to the tractor so that they can be controlled by
the tractor's hydraulic lift system.
The lower links can be independently adjusted up or
down by changing the lengths of the vertical arm
assemblies. This is done by rotating the turnbuckle on
each vertical arm assembly in the direction desired.
This adjustment provides alignment of the lower links
with the hitch pins on the implement during the initial
hook-up. This adjustment also provides the required
side tilt for implements that operate with one wheel of
the tractor running in the furrow - such as plows.
For implements needing some freedom of movement
to follow the contour of the ground; such as disc
harrows, cultivators, seed drills, etc., the lower adjust-
ing pin on each vertical arm assembly can be reposi-
tioned into the slot at the bottom of each vertical arm
assembly. This will allow the lower links to float.
The upper link can be adjusted by turning the center
section of the link like a turnbuckle.
It
can be adjusted
to obtain the correct pitch for the implement being
used.
It
may
also be shortened
or
lengthened to facili-
tate attachment of an implement.
The upper link
may
be located in any
of
the four sets of
holes in the upper link anchor. The hole selection
influences the responsiveness of the hydraulic lift when
in draft control. Select the correct set
of
holes for the job
being done, by referring to the data in the "Guide
To
Hydraulic Lift Control" chart. (See page 18)
A
wARNING:
NEVER - UNDER ANY CIRCUMSTANCES,
ATTEMPT
TO
PULL ANYTHING FROM THE
UPPER LINK, THE LIFT SHAFT, THE AXLE,
OR THE LIFT ARMS. HITCH LOADS TO BE
PULLED ONLY
TO
THE DRAWBAR, EXCEPT
WHEN
PULLING
IMPLEMENTS
SPECIFI-
CALLY DESIGNED FOR, AND PROPERLY
ATTACHED
TO
THE THREE POINT HITCH.
FAILURE TO HEED THIS WARNING CAN
CAUSE THE TRACTOR TO OVERTURN, RE-
SULTING
IN
POSSIBLE INJURY OR DEATH.
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