Operation and maintenance manual
SM 1382 Rev 1 03-05
Section 160-0050
3
Rear Axle Group - Wheel Rim and Tyre
WARNING
When lifting tyre from rim, be sure the
equipment is of sufficient capacity and
properly secured to do the job safely.
1. Remove valve cap and valve core and leave valve
open to prevent trapping of air in tyre. Tape valve
threads for protection.
2. Remove driver (2) from bead seat band (3) and
wheel rim (5).
3. Break outer tyre bead loose with pry bar shown in
Fig. 3.
4. Insert flat hooked end of pry bar into breaking slots
between bead seat band (3) and outer flange (1) (See
Fig. 4). A pipe over the straight end of the pry bar will
increase leverage.
5. Twist bar toward tyre to break bead.
6. A second bar may be inserted in space between
bead seat band (3) and outer flange (1). Twist second
bar to maintain space gained by the first bar.
7. Move the first bar around the rim, twisting and
following with the second bar, until the outer tyre bead
is loose.
8. Pry bead seat band (3) away from lock ring (4) by
placing hooked end of pry bar in groove of wheel rim
(5), between ends of lock ring (4), and prying up with
bar. Using two bars, as in Step 7, work completely
around wheel rim (5).
9. Pry lock ring (4) out in same manner by starting at
prying notch in rim assembly and work all the way
around rim with two pry bars.
10. Remove and discard 'O' ring (2, Fig. 1).
11. Remove lock ring (4), pry out and remove bead
seat band (3).
12. Breaking slots are provided inside the rims. The
inner bead may be broken as described in Steps 4
through 8. If tyre and rim assembly are on the
machine, the following procedure may be used for
breaking the inner bead.
13. Place jack between inner flange (6) and machine
frame. Extend jack until tyre bead is broken. Continue
around rim until tyre bead is broken at all points.
14. Using suitable lifting equipment, remove tyre from
rim. This completes the removal of the tubeless tyre.
15. If necessary, remove inner flange (6).
Note: If tyre rim is on machine, and no tyre lifting
equipment is available, 'walk' tyre off rim as follows:
Force bottom of tyre outward as far as possible; lower
jack enough to allow weight of tyre to rest on ground;
force top of tyre out as far as possible; raise jack to
original height and repeat the above until tyre is off rim.
INSPECTION
Tyre
Check the interior surface of the tyre to determine its
condition. Inspect for cuts or fabric breaks that have
penetrated the tyre body. The casing should be
inspected closely for any sharp , pointed object that
may have penetrated the tyre body but is invisible from
the outside. All dust, dirt, water or other foreign matter
should be cleaned from the inside of tyre.
Rim Assembly
Overloading, improper tyre inflation, rough terrain, high
speed, accidents, dirt accumulation, and corrosion all
tend to reduce the service life of rims and rim
components. It is recommended that rims be
inspected, as below, not less often than at every tyre
change and that, as the warranty limit approaches,
consideration be given to periodic replacement.
The rim and its components are designed with built-in
safety factors, to prevent the components from flying
off with killing force during inflation. Check components
for cracks, bends, distortion, or other damage. If
damage is found, the component must be replaced.
WARNING
Never mix components of one manufacturer's
rims with those of another. Using the rim base
of one manufacturer with the lock ring of
another or vice versa is dangerous. The lock
ring of one may not fully engage with the lock
ring groove of the other. Always consult the
rim manufacturer for proper matching and
assembly instructions. Also, use and servicing
of damaged, worn out, or improperly
assembled rim assemblies is a very dangerous
practice. Failure to comply with the above
warnings could result in explosions from tyre
pressure causing serious personal injury and
property damage.