Terex TS14G, Maintenance Manual

Page: 117 / 376

SM 1721 Rev1 03-05
Section 160-0050
11
angle of the skive should be no more than sufficient to
expel all foreign material and should extend no deeper
than the breaker. The skive should go to the bottom of
the hole. Tyres with shallow cuts, if treated promptly,
may be allowed to continue in service. If the cut
extends deeper into the tyre carcass, the tyre should
be removed for repair.
The tyre must be removed from the rim to repair larger
punctures or cuts. Irregular shaped punctures or cuts
less than 13 mm (0.50 in) in size can be repaired with
a plug and hot patch. Insert a repair plug into the hole
to keep out moisture and to back up the hot patch.
Trim the plug off flush with the inside of the casing,
buff, and apply the hot patch according to the
instructions supplied with the hot patch equipment.
Punctures 13 mm (0.50 in) or larger, large cuts, or
bruise breaks require sectional or reinforced
vulcanized repair. Cover the repair patch with a layer
of cushion gum after application to the tubeless tyre to
ensure an airtight repair. Any cords of the inside ply
that are exposed in buffing and are not covered with
repair patch must be coated with cushion gum to
prevent air leakage into the carcass plies on tubeless
tyres.
Recapping and Retreading
There are two general methods employed in restoring
the tread surface of off-the-highway tyres: recapping
and retreading.
A recapped tyre has a new tread cured right over the
old tread surface.
A retreaded tyre has the old tread removed entirely
and a new tread cured directly onto the body of the
tyre. A tyre can be recapped or retreaded if the cord
body is free of cuts, bruises and separation, and is
thoroughly sound, including previous repairs.
TYRE CARE
To obtain maximum service from off-highway tyres,
the following common-sense precautions should be
followed.
Maintain Correct Inflation
The most common cause of tyre damage is improper
inflation. Both over-inflation and under-inflation are
detrimental to tyre life. Tyre pressure should be
checked daily, preferably before the machine is placed
in operation. Refer to 'Tyre Inflation Pressures' table.
Rear Axle Group - Wheel Rim and Tyre
The valve cores should be checked for leaks. Keep in
mind that valve cores are delicate mechanisms that
wear out in service; therefore, they should be replaced
with new ones when they become worn. Each tyre
should be equipped with a valve cap to prevent dirt
from damaging the valve core and causing air leakage.
Maintain Good Haul Roads
Because haul roads are considered temporary roads
they are frequently neglected. The better the haul
road, the longer the tyre and machine life of off-
highway machines.
Although it takes time and effort to maintain good haul
roads, the delay and cost of tyres and machine
breakdowns caused by poor haul roads is many times
greater.
Inspect Tyres Regularly
A systematic plan for tyre inspection will more than
pay for itself in lowered tyre costs per hour of
operation. All tyres should be checked regularly for
cuts, bruises, ply material breaks, excessive or
uneven wear, embedded foreign matter, and any other
damage which can be repaired. A considerable
increase in tyre service can be realized if tyre
injuries are repaired before they have progressed to
the irreparable stage.
The rim mounting nuts should also be checked
periodically and tightened to the torque specified.
Prevent Overloading
Off-highway machines are designed to carry a
maximum allowable payload. Excessive loading will
overstress both the machine and tyres and shorten
the life of both.
Prevent Contact with Oil
Prevent tyre contact with petroleum products. Rubber
that is exposed to oil, gasoline, or grease becomes
soft and spongy and deteriorates rapidly. Always
avoid driving machine through a puddle of gasoline,
fuel oil, lubricating oil, or grease. Never let a tyre stand
in an oil or grease spot overnight.
Store Tyres Properly
The best of care given to tyres in service by operators
and maintenance personnel can be completely
nullified by careless storage. Time is not the only
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