Use and maintenance manual Self-propelled aerial platforms Page 20
5.1.2
Platform lifting/lowering
To lift and lower the platform use proportional lever
B
. To achieve the movement it is necessary to carry out the following
operations in sequence:
a)
press “dead-man” button
ZD
(or pedal
ZE
– Optional) at platform; its activation is signalled by a steady green led
O
;
when a steady green led lights up, “dead-man” button
ZD
can be released;
b)
within 2 seconds (10 seconds if pedal
ZE
is used) from the green steady led
O
lighting up, set the proportional lever
B
forward for lifting or backward for lowering.
By operating the joystick control gradually smooth accelerations and decelerations can be achieved during platform lifting.
Platform lowering is performed at one speed only.
WARNING!!
Control the platform lifting movement only on sufficiently solid and flat surfaces.
Lifting control is active only if lifting enable green warning light (T) is ON. If it is OFF, lifting control is
inhibited. See paragraph “Warning lights”.
5.1.3
Levelling jack control
Some models are fitted with four levelling cylinders to allow the machine to be positioned on inclined grounds.
WARNING!!
Always check the firmness of the ground before lifting the platform. Place strong wooden boards under
the levelling jack pads so as to spread the load on a wider surface.
An automatic system inhibits platform lifting in the event that one of the pads does not rest properly on
the ground. The levelling jack pads are resting on the ground when all warning lights ZB are ON.
Specially provided micro-switches located on the levelling cylinders control their position. With
lowered cylinders – even if not resting on the ground – drive is inhibited. If the pads are neither resting
on the ground nor completely lifted, the warning lights ZB are flashing. In order to carry out the
traction, lift the pads completely. When warning lights ZB turn off, pads are completely lifted.
To avoid any improper use, units with levelling cylinders are equipped with a suitable microswitch that
checks the position of the platform. When the platform is at a height above 3 meters (approx.) from the
ground the levelling cylinders cannot be operated.
The levelling cylinder operation is signalled by warning lights ZB. See paragraph “Warning lights”.
5.1.3.1
Manual levelling jack control
To lift/lower the levelling cylinders it is necessary to operate one or more of the four control levers
ZA
.
If you set levers
ZA
downwards, the levelling pads extract; vice versa, if you set the levers upwards, they retract. Also the
manual control of the levelling jacks is enabled by the “dead-man” button (or “dead-man” pedal - Optional).
The location of the control levers
ZA
and relevant warning lights
ZB
corresponds to the arrangement of the levelling cylinders:
-
Lever/Warning light
A
= Front left levelling cylinder;
-
Lever/Warning light
B
= Front right levelling cylinder;
-
Lever/Warning light
C
= Rear left levelling cylinder;
-
Lever/Warning light
D
= Rear right levelling cylinder;
