When Repairs Are Necessary - Komatsu 930E-2 Shop Manual

1. Only qualified maintenance personnel who under-
stand the systems being repaired should accom-
plish repairs.
2. Many components on the Truck are large and
heavy. Insure that lifting equipment - hoists,
slings, chains, lifting eyes - are of adequate ca-
pacity to handle the lift.
3. DO NOT WORK under a suspended load. Do not
work under raised body unless body safety ca-
bles, props, or pins are in place to hold the body
in up position.
4. Do not repair or service truck while engine is
running, except when adjustments can only be
made under such conditions. Keep a safe dis-
tance from moving parts.
5. When servicing any air conditioning system with
refrigerant, wear a face shield and cold resistant
gloves for protection against freezing. Be certain
to follow all current regulations for handling and
recycling refrigerants.
6. Follow package directions carefully when using
any cleaning solvent.
7. If an auxiliary battery assist is needed, use the
external battery connections provided on the
truck.
8. Always disconnect the positive and negative bat-
tery cables of the vehicle before doing any weld-
ing on the unit. Failure to do so may seriously
damage the battery and electrical equipment.
Disconnect battery charging alternator lead wire
and isolate electronic control components before
making welding repairs. (It is not necessary to
disconnect or remove any control circuit cards on
electric drive Trucks.)
Always fasten the welding machine ground (-)
lead to the piece being welded; grounding
clamp MUST BE ATTACHED AS NEAR AS
POSSIBLE to the weld area. Always avoid lay-
ing welding cables over or near the vehicle elec-
trical harnesses. Welding voltage could be
induced into the electrical harness and possibly
cause damage to components. Never allow weld-
ing current to pass through ball bearings, roller
bearings, suspensions, or hydraulic cylinders.
A03017

WHEN REPAIRS ARE NECESSARY

General Safety and Operating Instructions
9. If truck is to be towed for any reason, use a rigid
tow bar. Check truck cab for decal recommending
special towing precautions. (Also refer to Towing
Procedure in OPERATING INSTRUCTIONS.)
10. Drain, clean and ventilate fuel tanks and/or hy-
draulic tanks before making any welding repairs.
Any operating fluid, such as hydraulic oil or brake
fluid escaping under pressure, can have sufficient
force to enter a person's body by penetrating the
skin. Serious injury and possibly death may result
if proper medical treatment by a physician familiar
with this injury is not received immediately.
11. Relieve pressure in lines or hoses before making
any disconnects.
12. After adjustments or repairs, replace all shields,
screens and clamps.
13. Tire Care:
Do not stand in front of rim and locking ring when
inflating tire mounted on the machine. Observers
should not be permitted in the area and should be
kept away from the side of such tires.
Do not weld or apply heat on the rim assembly with
the tire mounted on the rim. Resulting gases inside
the tire may ignite, causing explosion of tire and
rim.
14. Only a qualified operator or experienced mainte-
nance personnel who are also qualified in opera-
tion should move the truck under its own power
in the repair facility or during road testing after
repairs are complete.
A3-17