Operation and maintenance manual

DX140R/DX140LCRSafety
1-48
Welding Repairs
When performing welding repairs, perform welding in a properly
equipped place. Repairs must be performed by a qualified
welder. Welding operations, can create potential hazards,
including generation of gas, fire, or electric shock. Never let an
unqualified welder do welding.
A qualified welder must do the following:
•
To prevent battery explosion, t
urn battery disconnect
switch to "OFF" position.
• Disconnect the connector between ECU and machine, and
the conn
ector between ECU and engine.
• To prevent generation of gas, remove paint from location
of the
weld.
• If hydraulic equipment, piping or component ports close to
them a
re heated, a flammable gas or mist could result in
an explosion or fire. To prevent this, protect and insulate
components from excessive heat.
• Do not weld on pipes or on tubes that contain flammable
fl
uids. Do not flame cut pipes or tubes that contain
flammable fluids. Before welding on pipes or tubes, or
before flaming cut pipes or tubes, clean them thoroughly
with a nonflammable solvent. Make sure pressure inside
pipes or tubes does not cause a rupture of the component
parts.
• If heat is applied directly to rubber hoses or piping under
pr
essu
re, they may suddenly break, so cover and insulate
them with a fireproof covering.
• Wear protective clothing.
• Make sure there is good ventilation.
• Remove all flammable objects and make sure a fire
exting
uisher is available.
IMPORTANT
When disconnecting or connecting connectors between
ECU and engine, or connector between ECU and the
machine, always disconnect the battery to prevent damage
to ECU.
If you do not follow this procedure, the ECU will be
damaged an
d/or the engine will not operate properly.