3-86 BA 50Z3/6003 en – Edition 4.3 * * 5003b340.fm
Operation
Rotating the upper carriage
Rotating the upper carriage is described with standard ISO controls.
The upper carriage can rotate a little bit further if the machine has not yet
reached its operating temperature.
• When rotating the upper carriage, the rear part of the machine protrudes beyond
the undercarriage.
• Ensure that there are no obstacles in the immediate vicinity.
• Fast actuation of the control lever rotates the upper carriage fast, slow actuation
of the control lever rotates the upper carriage slowly.
• If the upper carriage needs to be rotated on a slope, let the engine run at idling
speed and actuate the control lever very slowly. Proceed with extreme care and
avoid abrupt movements if the bucket is full.
In order to rotate the upper carriage to the left
☞ Push the left-hand control lever 3 to the left A.
➥ The upper carriage rotates to the left.
In order to rotate the upper carriage to the right
☞ Push the left-hand control lever 3 to the right B.
➥ The upper carriage rotates to the right.
Swivel unit brake
Hydraulic swivel unit brake:
The upper carriage’s rotation is sufficiently braked by moving control lever 3 back to initial
position. Moving the control lever in the opposite direction (counteraction) brakes the
upper carriage with maximum hydraulic output.
Mechanical stop brake:
A multidisc brake integrated in the rotation drive has an additional mechanical brake effect
with time delay. This negative-effect brake is used as a stop brake and parking brake for
the swivel unit. The upper carriage can be stopped in any position.
Fig. 174: Rotating the upper carriage to the left
A
3
Fig. 175: Rotating the upper carriage to the right
3
B
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