7
CAUTION
Figure 5: Emergency Lowering
If the Audible warning alarm sounds, normal control
functions will cease to operate. This will be due to one of
the following problems ;
z
deactivation of an Outrigger Limit Switch.
z
the activation of the Tilt Sensor.
In this situation the procedure is to turn the Platform “ON/
OFF/OVERRIDE” Switch to the ‘EMERGENCY
OVERRIDE’ position, and hold it in this position while
using the boom controls as normal to descend in a
controlled manner to ground level. Do not begin to rotate
until close to the ground.
After leaving the Platform, check all Outriggers and adjust
to ensure each is correctly deployed.
Note that during
emergency operation, controls will operate only at a
fixed, slow speed and will not allow the raising of the
Booms. The Booms can only be lowered.
Emergency Lowering
When operating this function, extreme care must be
taken to ensure that the person carrying out the task
does not become trapped by the Elevating
Assembly.
Should the machine become inoperable when elevated
request a person on the ground to lower the platform using
the emergency lowering valves.
These are red knobs (push or twist type) mounted at the
base of the 2 Main Hydraulic Lift Cylinders (See Figure 5
opposite). The decal located on the TL49’s Lift Cylinder’s
will identify the Emergency Lowering Valves as either a
‘PUSH’ type or a ‘TWIST’ type.
Operate the lower boom first by pushing (turning
anticlockwise) slowly until the boom starts to descend. The
speed of descent iscontrolled by the amount the valve is
pushed (turned anticlockwise) - ensure that the rate of
descent is kept slow and under control. Descent can be
halted at any time by removing pressure from the red knob
for the ‘PUSH’ type, or turning the ‘TWIST’ type
clockwise.
Repeat the operation if necessary for the upper boom
when the cylinder is in reach of the ground.
With both main booms lowered fully it should then be
possible to leave the Platform safely. A small step ladder
can be used if necessary.
MANUAL ROTATION
1.
Retract the Telescopic Boom and lower Boom2
fully. Ensure also that Boom1 is lowered as far as
possible, but just clear of the Tow Bar Weldment,
and that the Emergency Stop Button is pressed to
prevent any accidental powered operation.
2.
Apply a or 17 mm (or 13 mm if required) socket
wrench to the Gearbox Drive Shaft and turn to
rotate the Elevating Assembly. The Gearbox Drive
Figure 6: Manual Rotation
To rotate the Elevating Assembly first apply a 17 mm
(13 mm) socket wrench to the shaft and turn to rotate
the Elevating Assembly. When finished remove the
wrench.
Before operating the Emergency
Lowering Valves the surrounding
area should first be cleared of any
potential obstructions. It is also
important that when the valve is
pushed/turned, it is initially done
slowly. This is so that sudden
movement will not occur in the
Elevating Assembly, leading to a
potentially unstable machine.
Gerabox Manual
Rotation Shaft
