OPERATING CONTROLS AND PROCEDURES RT770E OPERATOR MANUAL
3-8 Published 04-04-2017, Control # 446-09
Boom Manual/Automatic Mode Selector
Switch and Indicator
The Boom Manual/Automatic Mode Selector Switch (12)
(Figure 3-4) and Indicator (13) are located on the overhead
control panel. The switch (12) is a two-position rocker type
switch labeled Auto (Automatic) and Man (Manual).
Normal crane operation is performed with the Boom Manual/
Automatic Mode Selector Switch (12) positioned to the Auto
Mode (bottom of switch is pressed), which causes the boom
sections, when actuated, to extend and retract in a
predetermined sequence based on the position of the Boom
A/B Mode Selector Switch (14) (Figure 3-4). When the Boom
Manual/Automatic Mode Selector Switch (12) is positioned
to Auto Mode, the Boom Manual/Automatic Mode Indicator
will indicate Auto Mode.
When the Boom Manual/Automatic Selector Switch (12) is
positioned to Manual Mode (top of switch is pressed), the
Boom Manual/Automatic Mode Indicator (13) will indicate
Manual Mode and the operator can control the sequence in
which the boom sections extend and retract by way of the
Boom Section 1/Section 2 Selector Switch (10). This manual
mode of operation is necessary when servicing the boom
and for the subsequent boom re-synchronization that is
needed to return the control system from the Manual mode
to the Automatic mode. Also, during Automatic mode
operation, if the rated capacity limiter (RCL) determines that
the boom is not synchronized, manual control of the boom
sections is again needed for boom/control system re-
synchronization.
Boom A/B Mode Selector Switch and
Indicator
The Boom A/B Mode Selector Switch (14) (Figure 3-4) and
Indicator (15) are located on the overhead control panel. The
switch (14) is a two position rocker type switch that is used to
change the sequence in which the boom sections extend
and retract when operating in the Automatic mode.
With the Boom Manual/Automatic Mode Selector Switch (12)
(Figure 3-4) positioned to automatic mode and the Boom A/B
Mode Selector Switch (14) positioned to A mode (top of
switch is pressed), the boom control system, when extending
the boom, will fully extend Sections 2, 3, and 4 before
extending Section 1; and when retracting the boom, the
control system will fully retract Section 1 before retracting
Sections 2, 3, 4. Conversely, when the Boom A/B Mode
Selector Switch is positioned to B mode, the boom control
system, when extending the boom, will fully extend Section 1
before extending Sections 2, 3, and 4; and when retracting
the boom, the control system will fully retract Sections 2, 3, 4
before retracting Section 1.
Switching between A and B modes can only be done when
the boom sections are fully retracted or fully extended.
Changing modes in any other boom configuration will cause
the RCL to lockout the boom telescope functions and turn on
the Boom Not Synchronized Indicator.
The Boom A/B Mode Indicator (15) is labeled A and B and
consists of two LEDs; one for A mode and one for B mode.
Dependent upon which position the Boom A/B Mode
Selector Switch is in, the respective LED will illuminate.
Boom Recovery Mode Switch and Indicator
The Boom Recovery Mode Switch (16) (Figure 3-4) and
Indicator (17) are located on the overhead control panel. The
switch (16) is a two position rocker type switch that has an
integral lock to prevent accidental activation. The Recovery
Mode Switch overrides the boom control system and allows
the boom to be recovered (retracted) in the event the boom
telescope function stops working due to a sensor failure or
loss of communication with the rated capacity limiter (RCL).
The indicator (17) will flash if a failure occurs. Refer to
Retracting the Boom Using the Boom Recovery Mode, page
3-39 to recover the boom if there is a failure in the boom
control system.
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