When Repairs Are Necessary - Komatsu 730E Operation & Maintenance Manual

Safety - Section 20
Page 20-14

WHEN REPAIRS ARE NECESSARY

1. Only qualified maintenance personnel, who
understand the systems being repaired, must
attempt repairs.
2. Many components on the Komatsu truck are
large and heavy. Ensure that the lifting equip-
ment - hoists, slings, chains, lifting eyes - are of
adequate capacity.
3. DO NOT stand under a suspended load. DO
NOT work under the raised body unless the
body safety cable is in place to hold the body in
the up position.
4. DO NOT service the truck while the engine is
on, except when absolutely necessary. Keep a
safe distance from moving parts.
5. When servicing the air conditioning system,
wear a face shield and cold-resistant gloves for
protection against frostbite. Follow all current
regulations for handling and recycling refriger-
ants.
6. Follow the package directions carefully when
using cleaning solvents.
7. If an auxiliary battery assist is needed, first use
one cable to connect the 24V positive (+) post
of the disabled truck batteries to the 24V posi-
tive (+) post of the auxiliary assist. Use the sec-
ond cable to connect the 24V negative (-) post
of the auxiliary assist battery to a frame ground
(-) on the disabled truck away from the battery.
8. Disconnect the positive and negative battery
cables before arc welding on the truck. Failure to
do so may seriously damage the battery and the
electrical equipment. Disconnect the battery
charging alternator lead wire and isolate the elec-
tronic control components before making the
welding repairs. It is not necessary to disconnect
or remove any control circuit cards or any of the
Alarm Indicating Device (AID) circuit control
cards.
Fasten the welding machine ground (-) lead to
the piece being welded; the grounding clamp
must be attached as near as possible to the
weld area. DO NOT allow welding current to
pass through the ball bearings, roller bearings,
suspensions, or hydraulic cylinders. Avoid lay-
ing the welding cables over or near the vehicle
electrical harnesses. The welding voltage could
be induced into the electrical harness and
cause damage to the components.
9. If the truck is to be towed for any reason, use a
rigid tow bar. Check the truck cab for decals for
special towing precautions. Refer to Section 30,
Operating Instructions - Towing.
10. Drain, clean, and ventilate the fuel tanks and/or
hydraulic tanks before welding.
NOTE: If it is necessary to weld the hydraulic tank or
fuel tank, drain, clean, and ventilate the tank(s)
before welding.
Pressurized hydraulic fluid may penetrate the
skin. Serious injury and possibly death may
result if the proper medical treatment by a physi-
cian familiar with this injury is not received
immediately.
11. Relieve system pressure before disconnecting
hoses or components.
12. After adjustments or repairs, replace all shields,
screens, and clamps.
13. Working near tires can be dangerous. Use
extreme caution when working around tires.
Refer to Tires earlier in this chapter.
14. Only a qualified operator may operate the truck
in the repair facility or during road testing.
OM2036 06/06