MacDon 9250 Operator's Manual page 109

Traction Drive: Wheels and Tires
TIRE INFLATION
Make a visual check daily that tires have not lost
pressure. Under-inflation of drive tires can cause
side wall cracks.
Once a year, measure tire pressure with a gauge.
Maintain the pressures recommended on page 12
(Specifications Section).
WARNING: Service tires safely. A tire
can explode during inflation and
cause serious injury or death. Never
increase air pressure beyond 35 psi
(240 kPa) when seating the bead on the rim.
Replace a tire if it has a defect. Replace a
wheel rim which has cracks, wear or severe
rust. Never install a tube in a cracked wheel
rim. Never weld a wheel rim. Make sure all the
air is removed from a tire before removing the
tire from the rim. Never use force on an inflated
or partially inflated tire. Make sure the tire is
correctly seated before inflating to operating
pressure.
Do not remove, install or make repairs to a tire
on a rim unless you have the proper equipment
and experience to perform the job. Take the tire
and rim to a qualified tire repair shop. If the tire
is not in correct position on the rim, or if too
full of air, the tire bead can loosen on one side,
causing air to leak at high speed and with great
force. An air leak of this nature can thrust the
tire in any direction, endangering anyone in the
area.
(A) - Use a safety cage if available.
(B) - Do not stand over tire. Use a clip-on chuck
and extension hose.
16.5 CASTER ANTI-SHIMMY SPRINGS
Maintain a spring length of 89 to 92 mm (3-1/2 to
3-5/8"). If necessary add 3/4 SAE flatwashers
under spring to achieve this dimension. See
Assembly section, page 135.
SHORTENING THE WHEEL BASE
The tractor unit's wheel base can be shortened
from 128 inches (3244 mm) to 113 inches (2864
mm) by reversing the walking beam. This work
should be done by a qualified dealer.
Form # 46584
MAINTENANCE/SERVICE
JACKING PROCEDURE
Position jack or jack stand under bracket (C)
welded to tractor frame legs, ensuring head of jack
is secured by keeper rod.
107
SERVICE TIRES SAFELY
JACK POSITION
Issue 11/06 Web Rev_01
C