DIGGER DERRICK
1-24
463280 - 9/14 Terex South Dakota, Inc. Digger Derrick
OPERATION GUIDELINES
OUTRIGGER INTERLOCK
If the completed unit requires outriggers for stability it will be equipped with Outrigger Interlock. Outrigger
Interlock will prevent raising the boom unless the outriggers are extended past a predetermined point. The
operator is responsible to set the outriggers properly to provide stability. If the booms do not operate and the
Outrigger/Unit Control Selector is selected to "UNIT”, then verify the outriggers are properly extended. The
operation of the outrigger interlock does not assure stability, it is only an operator aid. It only serves to
remind the operator that the outriggers have not been deployed.
To verify operation of the interlock:
• With o/r’s retracted, select unit and try to operate the boom. It must not operate.
• Lower all outriggers and verify boom operation.
• Retract one outrigger and try to operate the boom. It must not operate.
• After verifying operation, extend the outrigger before moving on to the next outrigger.
• Repeat for each outrigger. If the boom operates with any outrigger retracted, repair before use.
STABILITY
The stability of a vehicle equipped with a Digger Derrick depends on the gross weight of the vehicle and
platform capacity, the slope of the work area, and whether the ground is firm enough to support the force on
the outrigger pads. These conditions are widely variable, so the operator must exercise good judgement.
IMPORTANT: Know the platform capacities of your unit which includes operator(s), liner, tools,
and debris.
This Digger Derrick with a platform has been tested for stability on a flat firm
surface with a maximum slope of 5 degrees. Working on slopes that exceed 5
degrees may result in vehicle tipping over.
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