TL33 Work Platform 3-1
3.0 Introduction
General functioning
Refer to the Hydraulic and Electrical Schematics,
Section 6
The battery powered electric motor directly drives a two
section hydraulic pump. The low section of the pump is
not used. The high section supplies oil under pressure to
the various platform functions. The oil flow is directed to
the different functions by electrically activated
solenoid valves.
Setting up the machine for use
The TL33 must be set up on firm level ground. The
outrigger set-up is critical for sound stability of the unit
when elevated.
The outriggers are secured in the travel position by a
spring-activated retaining pin. When the outrigger is
lowered the pin locks the leg into the down position by
means of another retaining slot at the bottom of the
‘quadrant’ plate. The screw jack at the end of the
outrigger leg is then lowered until in contact with the
ground surface. Further adjustment off the appropriate
screw jack(s) are then made to level the machine using
the bubble level on the chassis as a guide.
All outriggers are fitted with electrical interlock limit
switches which prevent operation of any functions until all
outriggers are secured in the lowered position and the
outrigger foot is taking the machines weight. Should an
outrigger become unloaded during operation of the
booms an alarm sounds and further operation is
impossible except by means of an emergency override
switch on the cage control box, allowing the operator to
descend and remedy the cause.
Operating the booms
Only when the TL33 is set up according to the above
procedure can raising and lowering of the booms
commence.
The keyswitch at the lower control box can be switched
to platform or chassis controls.
Platform controls provide variable speeds for the boom
functions through the use of a joystick.
This is achieved using a motor control unit which varies
the speed of the motor/pump unit and increases
or decreases the flow of oil to the different functions.
This control unit receives a control signal from the
joystick on the upper controls.
The speed of the motor increases as the control lever is
pushed further away from the neutral (stopped) position.
Note: A deadman trigger is an integral part of the
joystick. This must be depressed for the
functions to operate. (This safety feature
prevents unwanted movement of the booms in
the case of inadvertent movement of the
joystick.)
Chassis controls provide a fixed speed for each of the
boom functions.
Design Features
The TL33 Series Work Platform has the following
features:
• The interlock system on the outriggers ensure that the
machine must be set up safely before use.
• The slew cut-out interlock ensures that the boom
support structure is clear of the towbar before
slewing can commence.
• The energy-efficient motor control units provides long
battery life and smooth proportional control of the
boom functions.
• All cylinders are fitted with hydraulic hose-burst
protection interlocks.
• The on-board charger is fully automatic and charges
the batteries efficiently and economically.
• If the work platform starts to become unstable and one
of the outrigger interlocks becomes de-activated an
alarm will sound in the upper control box. In this
situation power is cut to the upper controls to prevent
boom movement that might increase instability. An
emergency override switch is fitted to allow the booms
to be descend at a controlled speed to bring the
machine back to a stable position.
• In the event of a power loss the two lift cylinders are
fitted with emergency lowering valves which allow the
booms to be lowered at a controlled speed by an
operator on the ground.
• A manual rotation facility is fitted to allow rotation of
the booms in the event of power loss.
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