DIGGER DERRICK
1-19
Digger Derrick Terex South Dakota, Inc. 463280 - 9/14
OPERATION GUIDELINES
OPERATING TEMPERATURE RANGE
The ambient operating temperature range of the unit is given on the ID plate. Operation at the extremes of
the temperature range requires extra precautions.
Cold weather operation below 10 degrees F (-12 degrees C) requires:
• The hydraulic system must be filled with hydraulic fluid having a pour point suitable for the
temperature.
• The hydraulic system must be properly warmed up:
•Operate the pump at idling speed to allow the oil to warm up gradually. Cold, thick, sluggish oil may
not move fast enough and will starve the pump, thus causing severe damage.
•Circulate the oil through the outrigger system by cycling each outrigger several times before setting
up for boom operation.
•Circulate the oil through the system by cycling each function from the lower controls before operation
from the platform.
•The addition of oil heaters may be required.
• Operate the boom and functions slowly to prevent jerking and shock loading.
• Functions may operate sluggish and not be as responsive, so allow more time and distance when
starting and stopping movements.
Hot weather operation above 100 degrees F (38 degrees C) may require intermittent operation to allow the
oil to cool or the addition of oil coolers. Do not exceed an oil temperature of 150 degrees F (66 degrees C).
WIND SPEED
Do not operate the Aerial device or Digger Derrick at any wind speed that would create a potential hazard or
does not allow safe operation for the work to be performed.
Allow for platform, boom, load, and work-area movement, electrical line sway or sag during windy
conditions.
Always account for windy conditions during the work site inspection or survey.
NOTE: OSHA 1910.269 (x) (5) allows the use of Aerial devices and Digger Derricks up to a wind speed of 30
MPH (48 km/h). The OSHA general duty clause also requires the user to determine if conditions are safe
before proceeding with work.
It is both the user’s and operator’s responsibility to conduct a thorough work site inspection and determine if
the work can be performed and the equipment operated safely in the conditions at the site. It is the
responsibility of both the user and operator to also continuously monitor the work site conditions and if
conditions adversely change, to halt all operations until conditions allow for safe operation.
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