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MAINTENANCE
GENERAL INFORMATION
Welding operations can cause damage to electronic components.
(Computers, Control Units, Sensors etc.), in case the welding cur-
rent goes through these units. Therefore protective measures are
necessary before any weld repair is started.
GENERAL PROTECTIVE MEASURES
A.
Observe the prevailing safety and fire prevention
regulations.
Before any weld repair is started, a survey should be
made of the area and all safety considerations satis-
fied such as fuel tanks, oil lines, electrical cables and
synthetic materials.
B.
Attach the welding ground directly to the part that is
being repaired. Do not allow welding current to go
through bearings. Welding current could arc the
bearings, resulting in severe damage to the bearing.
WELD REPAIRS ON MAJOR COMPONENTS OF
THE EXCAVATOR
COUNTERWEIGHT
The chambers of the counterweight are filled with a mixture
of concrete, granulated ore and steel pellets. This mixture
can create explosive gases which will accumulate in the
chambers of the counterweight. Before any welding, flame-
cutting, grinding or drilling procedures are carried out on the
counterweight it is vital to expel these gases from the coun-
terweight chambers. Failure to properly expel the gases from
the counterweight chambers can result in an explosion with
serious personal injury or death.
Follow the instructions given in PARTS & SERVICE NEWS
No. AH04518 for expelling the gases from the counterweight
chambers.
Legend for illustration Z 20674
(1)
Undercarriage, refer to page 499 for protective mea-
sures.
(2)
Loader attachment, refer to page 501 for protective
measures.
(3)
Superstructure, refer to page 503 for protective mea-
sures.
WARNING
4.16 WELD REPAIRS
497
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