Snorkel TL33-sn1947+ - Manual (Page 6)

6
Figure 4: Emergency Lowering
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.
MANUAL ROTATION
1. Ensure booms are 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
Shaft for the 17 mm type gearbox is shown oppo-
site.
3. Remove the wrench.
above. For boom one or two functions the controls
will be forward for UP and backward for DOWN.
To rotate (Slew) RIGHT the Controller Joystick
should be moved forward. To rotate (Slew) LEFT
move the Controller Joystick backward.
7.
Before lowering, check beneath the Platform floor
for obstructions. Operate as described above,
moving the Joystick to lower the Booms.
EMERGENCY SITUATIONS &
EMERGENCY OVERRIDE
In any emergency situation, the first action to be taken
should be to hit the red “Emergency Stop” button. This
will give instant cutout of all functions. It will then be
required to twist the button clockwise to release before the
machine can be operated again.
If the Audible warning alarm sounds, normal control
functions will cease to operate. This will be due to one of
the following problems ;
l
deactivation of an Outrigger Limit Switch.
l
the activation of the Tilt Sensor.
In this situation the only operable machine functions are
Upper and Lower Boom Descent, use them 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 mounted at the base of the 2 Main
Hydraulic Lift Cylinders (See Figure 4 below). The decal
located on the TL33’s Lift Cylinder’s will give assistence
in the use of these valves.
Operate the lower boom first by pushing slowly until the
boom starts to descend. The speed of descent is controlled
by the amount the valve is pushed, 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.
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.
CAUTION