Unilift 538, Operator'S Manual

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Figure 1-4
Upper Controls
Figure 1-5
Pedestal Controls
4500360-1/1101
Page 1 - 4 - Operation
CONTROLS (THRU S/N: 2234)
The movement of the lift may be controlled from the bucket or at the
pedestal.
The bucket controls consist of four toggle switches located on the
control panel at the upper end of the telescoping boom, within easy
reach of the operator (see Figure 1-4). The first is an EMERG.
DOWN-OFF-ON switch which applies or removes power to all
control switches. The EMERG. DOWN-OFF-ON switch also serves
as a means to allow the lowering and retracting of the boom in an
emergency situation due to an electrical system malfunction. The
three directional control switches are oriented so that a movement of
a switch results in a corresponding movement of the bucket. They are
spring loaded to the neutral position. Moving the directional switch
handle in the direction of an arrow while holding the EMERG.
DOWN-OFF-ON switch to the ON position, causes the bucket to
move in a corresponding direction. When the directional switch
handle is released, it springs back to the neutral position, and lift
movement stops. It will also stop if you release the EMERG.
DOWN-OFF-ON switch.
The lift may also be operated by using the four control switches at the
pedestal (see Figure 1-5). The UPPER CONTROL-LOWER
CONTROL Switch handle must be held in the LOWER CONTROL
position before the directional control switches are operable.
The switch marked UP and DOWN controls the up and down
movement of the boom. The switch marked OUT and IN controls the action of the upper telescoping section of the boom.
The switch marked CCW and CW controls the rotation of the boom.
The rotation system is equipped with two limit switches that prevent more then 350
E
of rotation. When the boom is rotated
so that limit switch is reached, the rotation will stop. Simply reverse the control and rotate in the opposite direction to
position the bucket in the desired location.
Both upper and lower booms have stops to limit their travel. When this stop is reached, release the control switch to prevent
overheating of the hydraulic oil and shortened pump
life. Actuation of a control switch automatically
starts the DC motor so that this motor runs only when
required, conserving battery life.
Two or three controls may be actuated
simultaneously, depending on the bucket load and
which functions are operated. Generally, rotation
(which is a DC motor function) may be operated in
conjunction with any other function. Also, IN,
DOWN, and ROTATION (as would be used in
returning the boom to the stowed position from a
working position) may be operated simultaneously.
Courtesy of Crane.Market