DIGGER DERRICK
1-70
463280 - 9/14 Terex South Dakota, Inc. Digger Derrick
OPERATION GUIDELINES
WHAT TO DO IF HYDRAULIC LINES FAIL?
A quick response to stop oil flow caused by a hydraulic line failure is important to prevent further damage
and prevent injury.
The following sequence can be used to stop the flow.
From The Platform
• Release the function being operated. Shut off tool valve if tool, tool hoses, or tool connections are
involved.
• Activate the emergency stop control, which will divert the flow back to the tank.
• Activate the engine stop/start switch, if so equipped. This will stop the engine driving the pump.
• Get ground assistance if all of these fail to stop the flow of oil.
From The Vehicle Bed
• Move the control selector at the lower controls to the lower control position. This will stop all flow to
upper controls.
• Push the engine stop/start switch, if so equipped. This will stop the engine driving the pump.
From The Ground
• Shut off the pump engine. This will stop the pump.
• Disengage the power take-off. This will stop the pump.
• Move the control selector at the outrigger control valve to the outrigger position. This will stop all flow
to the Aerial Device and send it to the outrigger circuit.
• Push the engine stop/start, if so equipped. This will stop the engine driving the pump.
Once the flow is stopped, determine where the line failure is located. The following examples describe some
emergency procedures that can be followed for some specific types of hydraulic line failures:
• If the line failure is between the upper and lower controls, overriding the upper controls and only
operating from the lower controls may reduce the rate of hydraulic oil loss. The intermittent loss of
hydraulic oil may allow the Aerial Device to be stored.
• It may be necessary to use another Aerial Device to bring the operator down.
NOTE: Oil spills may require notifying Local, State, or Federal Authorities.
ENGINE FAILURE
HYDRAULIC PUMP FAILURE
If the primary hydraulic pump fails, use the auxiliary let down power system, if equipped.
The vehicle may be energized. If mounting or operating the vehicle from the
ground, use proper personal protective equipment; such as insulating rubber
gloves, rubber boots, rubber mats, and/or a hot stick. See Emergency Operation
section for procedure to approach vehicle.
The Aerial Device must not be operated until repairs have been completed and the
Aerial Device cycled from the lower controls to purge air.
If the prime power source fails, the optional auxiliary let down power system can
be used for emergency operation. If the auxiliary let down power system is not
installed and the vehicle has a manual transmission, then use the engine stop/start
control (if so equipped) to crank the engine.
To Next Page
Loading...
Need help?
General
