Operation and maintenance manual

SM 1382 Rev 1 03-05
Section 160-0050
7
Rear Axle Group - Wheel Rim and Tyre
b. Safety relief valve, 8.6 bar (125 lbf/in²), that will
assure an upper limit to the pressure available for tyre
inflation.
c. A 15.2 m (50 ft) length of flexible hose with
interconnecting fittings. On the tyre end of the hose is
a large bore quick connect/disconnect clip-on chuck.
2. The pressure regulator is connected to a nitrogen
compressed gas cylinder available from local suppliers.
3. The usual procedure for using this type of
equipment is as follows:
a. Connect nitrogen tyre inflation kit to nitrogen
compressed gas supply. DO NOT connect clip-on
chuck to the tyre valve at this time.
b. Open valve on nitrogen supply.
c. With flexible hose and clip-on chuck connected to
nitrogen tyre inflation kit assembly but not connected
to the tyre, adjust pressure regulator so that its output
pressure is not more than 1.4 bar (20 lbf/in²) higher
than the desired tyre inflation pressure.
d. Connect clip-on chuck to the tyre valve. The tyre will
now inflate. Tyre pressure can be monitored by
observing the gauge at the pressure regulator. STAY
AWAY FROM THE TYRE.
e. When desired inflation pressure has been achieved,
back off the regulator or close the valve on the
compressed gas cylinder.
f. Remove the clip-on chuck and adjust the tyre
pressure with the tyre gauge in the usual manner.
Re-inflation of a Mounted Tyre
To re-inflate a tyre with dry nitrogen gas which is now
inflated with air, proceed as follows:
1. Exhaust the tyre until only air at atmospheric
pressure remains in the tyre.
2. Re-inflate the tyre using only dry nitrogen gas to
4.15 bar (60 lbf/in²) gauge as a minimum, or to bead-
seating pressure as a maximum.
3. Adjust to the service inflation pressure required:
a. If the required service inflation pressure is LESS
than 4.1 bar (60 lbf/in²), remove the clip-on chuck and
adjust the pressure with the tyre gauge in the usual
manner.
b. If the required service inflation pressure is greater
than 4.1 bar (60 lbf/in²), further inflate, with dry
nitrogen gas only, to the pressure level required. Then
remove the clip-on chuck and adjust the pressure with
the tyre gauge in the usual manner.
New Tyre Mounts and Remounts
To newly mount or remount a tyre to its rim, use only
dry nitrogen gas; this includes the pressure required to
seat the beads. After seating the tyre beads, remove
the clip-on chuck and adjust the pressure with the tyre
gauge in the usual manner.
Note: Although a little more nitrogen gas is used to seat
beads than that used for re-inflation of a mounted tyre,
refer to 'Re-inflation of a Mounted Tyre', its cost is
generally negligible in comparison to the time and labour
saving and, longer tyre life achievable with the reduced
oxygen content which results.
TYRE EXPLOSION HAZARD
WARNINGS
Whenever a machines tyre(s) is (are) exposed
to excessive heat such as a machine fire or
extremely hot brakes the hazard of a
subsequent violent tyre explosion must be
recognized. All persons must avoid
approaching the machine so as not to be
physically endangered in the event of an
explosion of the tyre and rim parts. The
machine should be moved to a remote area,
but only when this can be done with complete
safety to the operator operating or towing the
machine. All other persons should stay clear of
the machine. The fire or overheated brakes,
wheel, etc. should be extinguished or cooled
from a safe distance. Do not attempt to
extinguish the fire or cool the machine by use
of hand-held fire extinguishers.
If it is absolutely necessary to approach a
machine with a suspect tyre, approach only
from the front or the back. Stay at least 15 m
(50 ft) from the tread area. Keep observers out
of the area and at least 460 m (1 500 ft) from
the tyre sidewall. Refer to Fig. 8. The tyre(s)
should be allowed at least eight (8) hours
cooling time after the machine is shut down or
the fire extinguished before approaching
closer.