Komatsu 960E-1 -, Руководство по ремонту, Страница: 40 / 51

CEN00002-05 00 Index and foreword
22
Precautions for performing repairs
NOTE: Only qualified maintenance personnel who
understand the systems being repaired should
attempt repairs. Only a qualified operator should
move the truck under its own power in the repair
facility or during road testing after repairs are
complete.
• Many components on the Komatsu truck are
large and heavy. Ensure that lifting equipment
(hoists, slings, chains, and lifting eyes) are of
adequate capacity to handle the load.
• Do not work under a suspended load. Do not
work under a raised body unless body retention
sling, props or pins are in place to hold the body
in the raised position.
• Do not repair the truck while the engine is
running, except when adjustments can only be
made under such conditions. Keep a safe
distance from moving parts.
• When servicing any air conditioning system with
refrigerant, wear a face shield and cold resistant
gloves for protection against freezing. Follow all
current regulations for handling and recycling
refrigerants. Refer to Testing and adjusting
section
Cab air conditioning .
• Follow package directions carefully when using
cleaning solvents.
• If an auxiliary battery assist is needed, refer to
"Starting with booster cables" or "Jump starting
with receptacles" earlier in this section.
• If the truck must be towed, use a rigid tow bar.
Check the truck frame for a decal recommending
special towing precautions. Also refer to the
towing instructions in Index and foreword section
Operating instructions .
• Relieve hydraulic pressure before disconnecting
any lines or hoses. Hydraulic oil escaping under
pressure can have sufficient force to enter a
person's body by penetrating the skin, resulting in
serious injury and possibly death.
• After adjustments or repairs, replace all shields,
screens and clamps.
Engine shutdown procedure after AC drive
system failure
If the AC drive system is operating normally when the
engine is shut down, the system should be safe to
service. However, in the event of a drive system
failure, performing the following procedure before any
maintenance activities will ensure that no hazardous
voltages are present in the AC drive system.
1. Before shutting down the engine, verify the
status of all the drive system warning lights. Use
the lamp test switch to verify that all lamps are
functioning properly.
If any of the red drive system warning lights
remain on, do not attempt to open any cabinets,
disconnect any cables, or reach inside the
retarding grid cabinet without a trained drive
system technician present, even if the engine is
off. Only qualified personnel, specifically trained
for servicing the AC drive system, should
perform this service.
2. If all red drive system warning lights are off,
follow the normal engine shutdown procedure in
Index and foreword section
Operating
instructions .
3. After the engine has been stopped for at least
five minutes, inspect the link voltage lights on
the exterior of the main control cabinet and the
DID panel on the rear wall of the operator cab.
a. If all lights are off, it is safe to work on the
retarding grids, wheel motors, alternator and
related power cables. Proceed to Step 5.
b. If any red lights continue to be illuminated
after following the above procedure, a fault
has occurred. Leave all cabinet doors in
place. Do not touch the retarding grid ele-
ments. Do not disconnect any power cables
or use them as hand or foot holds. Notify
your Komatsu service representative immedi-
ately.
4. Locate the generator field contactor (GF) switch
in the access panel on the left side of the main
control cabinet. Place the switch in the
CUTOUT position. This will prevent the
alternator from re-energizing and creating
system voltage until the switch is returned to its
former position.
5. Leave the drive system in the rest mode until
the truck is to be moved.