DIGGER DERRICK
1-68
463280 - 9/14 Terex South Dakota, Inc. Digger Derrick
OPERATION GUIDELINES
CONTROL SELECTOR (EQUIPPED WITH UPPER CONTROLS)
When a situation requires use of lower controls to override the upper controls (such as, injured personnel in
the platform), use the control selector at the lower controls to select the “lower” controls for operation of the
Digger Derrick. This will make the upper controls inoperable. Then “lower” controls can be used to lower the
operator to the ground, provided the upper controls are intact. The Control Selector functions as an
emergency stop by taking oil flow away from the active controls. If the operator is unable to operate the
Digger Derrick, determine if any damage has occurred to make the Digger Derrick inoperable. If the situation
allows safe operation from the lower controls, override the upper controls and carefully lower the platform to
the ground. If the Digger Derrick will not operate due to the damage incurred, consider one of the other
auxiliary operating procedures presented in this section to solve the problem.
MANUAL ROTATION (WORM DRIVE ROTATION)
If all the hydraulic power sources become inoperable, the Digger Derrick rotation system can be actuated
manually. Use a 7/8 in. hex socket, an extension, and a ratchet to rotate the input shaft on the gearbox.
Actuating the lower rotation control will reduce the effort required for the rotation.
If the Digger Derrick is equipped with planetary rotation, an auxiliary power source must be used.
AUXILIARY LET DOWN POWER (OPTIONAL)
The auxiliary let down power system provides power from a DC motor-pump for operation of the Digger
Derrick in case of a prime power source failure. Controls for auxiliary let down power may be located at the
platform, pedestal (optional), and outrigger (optional). At the platform, the auxiliary let down power is
operated by an air cylinder located with the upper controls. To activate this system, push and hold the air
cylinder's plunger knob (labeled “Auxiliary Power”). The pump will engage after a 10 second delay, then
operate the controls. To turn “off” the power, release the air cylinder's plunger knob. The auxiliary let down
power system should not be continuously operated longer than 30 seconds. Continuous use will drain the
battery and damage (overheat) the motor. At the pedestal and the outrigger controls (if equipped), the
auxiliary let down power is operated by a push button switch. To activate this system, push and hold the
switch, the pump will engage after a 10 seconds delay. To turn “off” the power, release the switch. The
auxiliary let down power system should not be continuously operated any longer than 30 seconds.
Continuous use will drain the battery and damage (overheat) the motor. Do not use the let down pump as an
auxiliary pump. Use the let down pump only to lower the booms and/or raise the outriggers when either the
main pump or engine malfunctions. Using the pump to raise the booms may cause damage to the let down
pump motor. When the Digger Derrick is equipped with engine two-speed throttle and auxiliary let down
power, the same control is used for both. When the engine is running, the engine two-speed throttle
operates. When the engine is off, the auxiliary let down power operates. Test the auxiliary let-down system
weekly to ensure the system will operate properly when needed.
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