DIGGER DERRICK
1-31
Digger Derrick Terex South Dakota, Inc. 463280 - 9/14
OPERATION GUIDELINES
LIFTING AND BOOM SECTIONS
ROTATION
The rotation system is intended to rotate the rated working load suspended on the load line.
If the vehicle is operated on sloping ground, use extreme caution when rotating toward the low side. The
load chart on the unit gives the capacity when properly stabilized on level ground. The capacity is reduced if
vehicle is not level.
LIFT CYLINDER CAPACITY
When you consult your Digger Derrick load capacity chart, note that the Digger Derrick lift capacity increases
at high boom angles and at shorter distances from the centerline of rotation to the centerline of the load
(radius). You must know the weight of load to be lifted and the correct position of the boom so the capacity
shown in the load capacity chart is not exceeded.
To determine if an unknown weight can be lifted all of the following conditions must be met:
Determine the weight using a load cell or dynamometer between the load line and the load.
• The load must only be lifted with the lift cylinders.
• The hydraulic pressure must be at the proper setting for the particular model and the hydraulic
pressure shown on the pressure gauge must not exceed setting shown on the ID Plate.
• The load shown for the boom angle and extension on the load chart must not exceed the winch line
capacity as shown on the right side of the load chart, multi-parting may be required.
• Rotational position of the boom relative to the truck must be in the working zone which shows the
maximum load on the load chart.
Do not pull, drag, or jerk while using the winch, digger, or rotation control. This can
overload and damage the rotation mechanism, which can result in death or serious
injury.
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