5 . MAINTENANCE AND ADJUSTMENTS
5.24
Challenger MT500B EU
5.17 - TYRES
5.17.1 - Dual rear wheels
In general, dual rear wheels should be used for soil bearing
capacity work (surface treatment and work) The correct
dual rear wheels should be chosen according to the four
following criteria:
1. Soil bearing capacity
2. Tractive effort (narrow wheels)
3. Overall dimensions (2m50 for road gauge)
4. Type of tyre
CAUTION: The wrong choice of dual wheels
has a direct influence on the mechanical com-
ponents and the wheel discs of the tractor.
The use of dual wheels should be avoided
when making strong tractive efforts, even momentar-
ily (tree-stump extraction, pulling out a bogged-down
tractor, etc.).
5.17.2 - Use
Set the tractor to minimum track (Fig. 42).
The use of very wide tyres on dual wheels is not recom-
mended.
The most efficient dual wheels arrangement uses two
tyres of the same specifications.
1. When fitting dual wheels with tyres of different
widths, the wider wheel must be fitted inside.
When fitting dual wheels with tyres of the same width,
the tyre which is more worn must be fitted on the out-
side.
2. It is preferable to use wide tyres or low pressure tyres
instead of twin wheels.
NOTE: Dual wheels do not double the load capacity of
the tractor.
The minimum distance allowed between the tyres is 100
mm (A Fig. 42).
In clay soil, this distance should be increased in proportion
to the tyre size. Example:
13.6-28 - Distance 130 mm
16.9-38 - Distance 160 mm
20.8-42 - Distance 200 mm
5.17.3 - Wheel bolts
Check the tightening torque after the first two hours of use
following fitting and every day thereafter.
Liquid ballasting
Steering and braking performance can be considerably af-
fected by attaching implements. To maintain the required
ground contact pressure, ensure that the tractor is ballast-
ed correctly. Advice is available from your local Dealer.
• Tyres with tubes:
CAUTION: When preparing a calcium chloride
solution for liquid ballasting the tractor tyres,
NEVER pour water on to the calcium chloride;
this can produce chlorine gas which is toxic
and explosive. This can be avoided by slowly adding
calcium chloride flakes to water and stirring until they
are dissolved.
• Tubeless tyres
Use a glycol based liquid containing corrosion inhibiting
agents other than nitrites (Na No
2
). Example: Agrilest,
Castrol, Lestagel, Igol, etc.
5.17.4 - Inflation pressure
0.2 bar less on the outer tyres.
5.17.5 - Pressure under load (bar) (psi)
Check the tyre pressures every 100 hours. Tyre pressures
vary according to make type, load and speed as well as to
the type of work to carry out.
Refer to the inflation tables issued by the tyre manufactur-
ers.
The relationship between the sizes of the front and rear
on 4-wheel drive tractors is most important and only
compatible sizes must be used. The compatibilities are
given in chapter 6.
Fig. 42
Z2-590-05-03
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