Safety - Section 20 7/11 OM2042
Page 20-16
5. Before welding on the truck, disconnect all
electrical harnesses from the Engine Control
System (ECS) inside the electrical cabinet
behind the operator's cab. Also, disconnect the
ground strap from the ECS.
6. Do not weld on the rear of the control
cabinet! The metal panels on the back of the
cabinet are part of capacitors and cannot be
heated.
7. Do not weld on the retarding grid exhaust
louvers! They are made of stainless steel.
Some power cable panels throughout the truck
are also made of aluminum or stainless steel.
They must be repaired with the same material
or the power cables may be damaged.
8. Power cables must be cleated in wood or other
non-ferrous materials. Do not repair cable
cleats by encircling the power cables with metal
clamps or hardware. Always inspect power
cable insulation before servicing the cables and
returning the truck to service. Discard cables
with broken insulation.
10. Power cables and wiring harnesses should be
protected from weld spatter and heat.
Always 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.
Always avoid laying welding cables over or near
the vehicle electrical harnesses. Welding
voltage could be induced into the electrical
harness and cause damage to components.
Before doing any welding on the truck,
disconnect the battery charging alternator lead
wire and isolate electronic control components.
Also, always disconnect the negative and
positive battery cables of the vehicle. Failure to
do so may seriously damage the battery and
electrical equipment.
Never allow welding current to pass through ball
bearings, roller bearings, suspensions or
hydraulic cylinders.
11. If the red lights on the exterior of the control
cabinet and/or the back wall of the operator's
cab 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 elements. Do not disconnect
any power cables or use them as hand or foot
holds.
Notify your Komatsu service representative
immediately. Only qualified personnel,
specifically trained for servicing the AC drive
system, should perform this service.
12. Replace all covers and doors. Place the GF
cutout switch and battery disconnect switches
in their original positions. Reconnect all
harnesses prior to starting the truck.
Leave the drive system in the rest mode until
the truck is to be moved.
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