DIGGER DERRICK
1-63
Digger Derrick Terex South Dakota, Inc. 463280 - 9/14
OPERATION GUIDELINES
UPPER CONTROL SELECTOR AT LOWER CONTROLS (OPTION VALVE)
When the lower control valve selector is in the upper control position, oil flows to the upper controls. When
lower controls are selected, oil flow is stopped to the upper controls to allow over-riding the upper controls in
an emergency situation.
TOP CONTROLS
NOTE: Sequenced HYDRAULIC THIRD SECTION: Only one valve section is provided at the upper
controls which controls the extension and retraction of both the second section and
fiberglass third section. The third section always extends first and then the second
section, and the second section retracts first and then the third section, providing
maximum insulation length at all times.
Determine the movements required to reach the work location. Feather the controls to smoothly start and
stop the Digger Derrick movements. Use slow deliberate movements, when approaching the aerial job site.
Use high speed only when traveling to and from the job site in open areas with no obstacles. Use slower,
controlled speeds when moving in the job site or around obstacles. Look in the direction the Digger Derrick
is traveling to be certain there is clearance for the boom(s), platform, and operator.
ITEM CONTROL DESCRIPTION
1. Stop/Start (Optional) Allows operator to stop and start the engine from the top controls.
2. Two-Speed Throttle (Optional) Provides two engine speeds, low and high. At low speed, the
engine is at idle.
3. Rotation Allows the unit to rotate either left or right.
4. Lift Allows the boom to be raised or lowered.
5. * 2nd & 3rd Extension Allows the boom to be extended or retracted. (Sequential
extension)
6. Winch Allows winch operation
7. Hydraulic Tool (Optional) Allows auxiliary tools to be operated when in the detent pull
position.
8. Upper Control Stop Disables all boom functions in detent push position.
After entering the platform, attach the safety lanyard to the anchor provided on the
platform-mounting sleeve. An OSHA compliant fall arrest system must be used.
Disengage platform brake before operating controls.
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