DIGGER DERRICK
1-21
Digger Derrick Terex South Dakota, Inc. 463280 - 9/14
OPERATION GUIDELINES
• If unit is not equipped with outriggers, or only has one set of outriggers the tires and suspension on
each side of each axle must uniformly support the truck and load because they are part of the stability
system when operating the Digger Derrick. If one tire and axle spring is not loaded the same as the
other, on that axle, it will not be able to provide the stability needed.
• A tire cannot be in a hole or depression even if the truck is parked and the indicators show less
than 5 degree angle.
If unit is equipped with two sets of outriggers, the axles not between the outriggers must equally support the
load of the truck so the suspension on each side is equally loaded.
Use the following procedure after the vehicle is in position at the work site:
• Turn on warning lights as you approach the work site or after the Digger Derrick is in position
according to your employer’s policies.
• Place vehicle in neutral and set brakes before leaving cab.
• Chock the wheels.
• Position and use signs, warning lights, and barricades in accordance with OSHA, ANSI, state, and
company rules and regulations.
• When work is to be performed on or near power lines, ground and/or barricade vehicle according to
your company policy. If using a temporary ground connect grounding cable clamped to a static line or
neutral, or use drive or screw type ground rod to ground truck according to your company policy.
Unroll ground cable fully and spread out so cable does not cross over.
• Engage the power take-off (PTO) following the directions given with the specific PTO installed on the
truck.
• Turn master switch on to energize unit electrical systems. (May also function as PTO Switch.)
• Set the outriggers (if equipped).
Working on slopes that exceed 5 degrees may result in vehicle tipping over. The
level indicators are only an operator aid, it will show if the angle is over 5 degrees
at the indicator location but will not show if the ground is less than 5 degrees or
frame twisted. The operator must visually verify the ground condition.
If the unit is equipped with outriggers, all outriggers must be set properly to
provide adequate stability.
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