A \A'ARNVNG
S83369
S83302
Operating instructions
Working with bucket 131
£
S83062
Float position
A
WARNING!
Always make sure that the boom operating lever is in the
neutral position before activating the float position.
Do not select the float position mode while the track or
tracks are elevated:
Selecting the float position mode and operating the boom
operating lever forward (boom down position) while the
track or tracks are elevated could cause the machine to
drop down suddenly.
Do not release float position mode while the boom
operating lever forward (boom down position) and bucket
or tool is on the ground:
Releasing the float position mode while the lever for boom
operating lever forward (boom down position) and bucket
or tool is on the ground could cause the machine to tilt up
suddenly.
Do not attempt to lift the track or tracks while the machine
is in float position mode.
Float position means that both the boom cylinders' piston and pis-
ton rod sides are connected to the hydraulic tank. The boom then
"floats" and it is only the weight of the equipment and the load that
lower the boom when the boom operating lever is pushed forward.
The boom lifting is not affected by float position.
Float position gives better fuel economy, faster excavation cycle,
less wear and less vibration. When the float position is engaged,
the oil flow of the machine can be used for other purposes than
lowering the boom, such as the arm and bucket. These functions
then become faster and more efficient.
Use the float position when the attachment has to follow irregular-
ities in the ground, such as for bedrock clearance, grapple han-
dling and when unloading barges and flatbeds. Float position also
makes unloading more manageable.
Float position is only in operation when you push the boom oper-
ating lever forward. If the attachment is to follow the ground, the
boom operating lever must therefore be held forwards all the time
the arm and bucket are operated. The boom can then move up-
ward and downward freely, depending on the state of the ground.
— Select the float position using button 1 on the boom operating
lever (the float position control lights up on the instrument pan-
el).
See Thumb with three button lever
on
page 74.
— Use the float position for all normal excavation.
Deselect the float position by pressing the button 1 again (the light
goes out)
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