Hyundai HL930A, Operation & Maintenance Manual

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43) BOOM SAFETY LOCK BAR (option)
(1) Supporting
If it is necessary to carry out any main-
tenance operation or to stop the ma-
chine with raised boom, always use the
boom safety lock bar and put the pilot
cut off switch to the OFF position.
The attachment should be empty.
a
Raise the boom fully.
b
Stop the engine and remove the starter
key.
c
Loosen the two wing bolts and remove
safety lock bar from its stowage position.
d
Place the safety lock bar onto the boom
cylinder and secure the safety lock bar by
tying the string shown as figure.
e
Slowly lower the boom to fix the safety
lock bar.
When lowering the boom, operate the
control lever very slowly.
(2) Lowering
a
Raise the boom to take the weight off the
safety lock bar.
b
Stop the engine and remove the starter
key.
c
Loosen the string and remove the safety
lock bar carefully.
d
Reinstall the safety lock bar onto its stow-
age position using the wing bolts.
Stowage position
Supporting position
String
Wing bolt
Boom safety lock bar
6-53