Case 580SR Service Manual page 1032

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2. LOADER BUCKET SELF LEVELING
The self-levelling linkage mounted on the right hand
loader arm and chassis automatically controls the
angle of the loader bucket during the raising cycle of
the lift arms to maintain a constant bucket level.
There is no self-levelling during lowering.
Return to dig is an electrically activated feature
which enables the operator to automatically return
the bucket to a level digging position for a further
work cycle with one simple movement of the loader
control lever (3).
Whenever the bucket is rolled forward to dump, the re-
turn to dig system is activated, and the solenoid valve
on the bucket spool is energized.
When the loader bucket control lever (3) is moved di-
agonally left to the return to dig position (2) the elec-
tromagnet will hold the bucket spool in the roll back
position until the bucket is in the level digging posi-
tion at which time the indicator on the rod of the buck-
et self-levelling linkage will pass in front of the sensor
which de-energises the electromagnet on the bucket
spool enabling the spool to return to the neutral posi-
tion.
RETURN TO DIG SENSOR ADJUSTMENT
The return to dig system consists of an electromag-
net mounted on the loader bucket control valve
spool, a sensor (1) mounted on top of the loader arm
and a pointer attached to the tube of the bucket self-
levelling linkage.
Z Place the bucket on the ground in the preferred dig-
ging position.
Z Check the dimensions of 88.5 mm and 7.5 mm are
maintained as shown.
Z Ensure the face of the sensor (1) is 6 mm from rod
(2).
As a visual aid for the operator, while seated in the
cab, the pointer mounted on the loader arm can be
seen to align with the pointer on return to dig linkage,
when the loader arms are lowered and the bucket is
in the level digging position.
SECTION 82 - LOADER
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