Komatsu 930E-2, Shop Manual

Page: 243 / 739

TIRES AND RIMS
The truck tires should be inspected and tire pressure
checked with an accurate pressure gauge before each
working shift. Tire pressure will vary according to
manufacturer and local working conditions. Consult
the tire manufacturer for recommended tire pressure.
Insure valve caps are securely applied to valve stems.
The caps protect valves from dirt build up and damage.
DO NOT bleed air from tires which are hot due to
operation; under such circumstances, it is normal for
pressure to increase in the tire due to expansion.
A bent or damaged rim which does not support the
bead properly may cause abnormal strain on the tire
resulting in tire damage. If a tire becomes deeply cut,
it should be removed and repaired. Neglected cuts
cause many tire problems; water, sand, dirt and other
foreign materials work into the tire through a cut,
eventually causing tread or ply separation.
Tires should be stored indoors if possible. If stored
outdoors, cover tires with tarpaulin to keep out dirt,
water and other foreign materials. Long exposure to
the sun will cause ozone cracks. Storage should be in
a cool, dry , dark, draft free location. Tires should be
stored vertically. If they must be laid on their sides for
a short period, avoid distortion by stacking no more
than three tires on top of one another. Avoid contact
with oil, grease and other petroleum products.
Before storing used tires, clean thoroughly and inspect
for damage. Repair as necessary. When a truck is
placed in storage, it should be blocked to remove the
weight from the tires. If a stored truck cannot be
blocked, check air pressure and inspect tires twice a
month for proper inflation pressure.
DO NOT weld or apply heat on the rim assembly
with the tire mounted on the rim. Remaining gases
inside the tire may ignite causing explosion of tire
and rim.
DO NOT go near a tire if a brake or wheel motor
has experienced a fire until the tire has cooled.
When inflating tires always use a safety cage.
Never inflate a tire until the lockring is securely in
place. Do not stand in front of or over the lockring
during inflation procedures. Never overinflate a
tire. Refer to tire manufacturers recommenda-
tions.
Always keep personnel away from a wheel and tire
assembly when it is being removed or installed.
The tire and rim weigh approximately 13,200 lbs.
(5993 kg). Be certain tire handling equipment is
capable of lifting and maneuvering the load.
Due to the size and weight of the tire and rim assem-
blies, special handling equipment such as a modified
fork lift (“tire handler”) as shown in Figure 2-1 is
desirable. Consult local tire vendors for sources of
equipment designed especially to remove, repair, and
install large off-highway truck tires.
FIGURE 2-1. TYPICAL TIRE HANDLER
G02015 Tires and Rims G2-1