MCCORMICK MTX Series - MFD Front to Rear Tyre Size Combinations

Tyres, Wheels, Ballasting
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MFD FRONT TO REAR TYRE SIZE COMBINATIONS
Tractors equipped with Mechanical Front Drive
and Independent Front suspension must use
front and rear tyre combinations that are correctly
matched. The use of recommended tyre
combinations will give maximum tractor
performance, extended tyre life and reduced
wear on drive train components.
The LEAD/LAG (How fast the front tire rotates
compared to the rear tire) should be between 0
and 5 percent lead, with +1 to +3 percent being
ideal. To calculate the LEAD/LAG, use the
following formula:
RC
F
= Rolling Circumference of Front Tire (Refer
to the Tire Manufacturers Hand book).
RC
R
= Rolling Circumference of Rear Tire (Refer
to the Tire Manufactures Hand book).
IR = Inter Axle Ratio (see page 251).
IMPORTANT: To minimize tire wear, MFD
tractors must have MFD disengaged if the
tractor is going to be run at high speeds and
low loads (roading). This procedure will also
reduce power loss, increase fuel economy and
ride stability.
IMPORTANT: NEVER exceed the load capacity
or the inflation pressure for a particular tire.
IMPORTANT: The tyre size combinations are
specified to provide matched ground speeds of the
front and rear tyres. Mixing worn and new tyres or
tyres of different diameters, manufacturers, or
loaded radii can give incorrect ground speed
match. When replacing tyres refer to the tables on
the following pages. If the tyres required are not
listed or you are in any doubt consult your dealer.
IMPORTANT: If you change the tyre size
combination, the rear hitch MUST be calibrated
to suit the new tyre sizes, if in doubt see your
dealer. It will also be necessary to program the
correct tyre constant into the instrument
cluster.
Permitted Front to Rear Tyre Size Combinations
* = High Clearence Tractors
● = Correct tyre size combination. For tyre combinations not listed, see your dealer.
(
RC
F
xIR
)
- RC
R x 100 = lead
RC
R
REAR TYRES
FRONT TYRES
13.6R28 14.9R28 16.9R28
380/70R28 420/70R28 480/65R28 480/70R28 540/65R28
16.9R30
540/65R30
13.6R36*
16.9R38
● ●
18.4R38
●●
20.8R38
● ●
480/70R38
●● ●
520/70R38
●
580/70R38
●
600/65R38
●
650/65R38
●
18.4R42
● ●
14.9R46
●
20.8R42
●
650/65R42
●