Komatsu 830E, Руководство по ремонту

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G02004 04/03 Tires and Rims G2-1
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. Con-
sult tire manufacturer for recommended tire pres-
sure.
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 nor-
mal for pressure to increase in 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 a malfunction. If a tire should become
deeply cut, it should be removed and repaired.
Neglected cuts cause many tire problems. Water,
sand, dirt and other foreign materials work into a tire
through a cut eventually causing tread or ply separa-
tion.
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 or 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 deflated tires. If stored
truck cannot be blocked, check air pressure and
inspect tires twice a month for proper inflation pres-
sure.
FRONT TIRES AND RIMS
Removal
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 explo-
sion 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 lock-
ring during inflation procedures. Never overin-
flate a tire. Refer to tire manufacturers
recommendations.
Always keep personnel away from a wheel and
tire assembly when it is being removed or
installed.
The tire and rim weigh approximately 11,000 lbs.
(4995 kg). Be certain tire handling equipment is
capable of lifting and maneuvering the load.
Manual tire removal and installation is possible but,
due to the size and weight of the components, spe-
cial handling equipment is desirable. Consult local
tire vendors for sources of equipment designed
especially to remove, repair, and install large off-
highway truck tires.
If the studs in the front wheel hub require replace-
ment, use a special stud installer tool and tighten
studs to 540 ft.lbs. (732 N.m) torque.
1. Apply parking brake and block rear wheels to
prevent movement of truck.
2. Shut down engine, turn keyswitch OFF, and
allow at least 90 seconds for the accumulator to
bleed down. Turn the steering wheel to be sure
no pressure remains. As a safety precaution,
bleed down brake accumulators.
3. Place jack under spindle or under frame at the
front cross tube.
4. Raise front end of truck until tires clear ground
and block up securely under frame.
5. Visually inspect all brake components for dam-
age or wear. Inspect hydraulic brake lines for
damage or leaking fittings.
6. Secure wheel assembly to hoist or fork lift and
take up slack. Remove wheel nuts (8, Figure 2-
1), and wheel retainer lugs (7) securing wheel
assembly to wheel hub. Remove the clamp that
secures the tire inflation valve to the wheel hub.
Care should be taken not to damage the inflation
stem during tire removal.