Broderson RT-400-A - Control Valve and Boom Functions

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CONTROL VALVE FUNCTIONS
The control valves for the RT-400 utilize a pilot hydraulic system, whereas the valves are not
mounted in the cab.
Boom Function:
Controls for operating boom rotation, boom elevation, boom extension and hoist are actuated
by four, single-axis joysticks with two mounted to each arm rest of the operator compartment.
The joystick handles are hydraulically connected to the remote- mounted hydraulic control
valves. An arming button (ARM) is located in the 15-button panel below the main display to
serve as the handle interlock for the pilot control system.
The
seat switch and the arming
button must be active to enable functionality of the pilot control joysticks. Boom functions will
not operate unless the arm button is engaged before moving the joysticks out of center.
Disengaging the ARM button or releasing the seat switch while the handle is not centered will
result in an abrupt stop. The placards located at the base of the joystick handles identify the
function and direction resulting from each handle movement.
BOOM ENABLE CONTROLS
1. Swing or Slewing: Pushing forward on
the left-hand joystick lever will rotate the
boom to the operator's right; pulling back
will rotate it to the operator's left.
2. Telescope: Pushing forward on the right
joystick located at the operator's left will
extend the boom; pulling back will retract
the boom.
3. Boom lift or Topping: Pushing the left-
hand joystick that is located at the
operator's right will lower the boom;
pulling back will raise the boom.
4. Hoist: Pushing the far right joystick will
lower the load line; pulling back will raise
the load line. Included in this joystick is a
drum rotation indicator that will vibrate as
the hoist drum rotates. Holding a finger
over the top of the lever will give the
Operator the strongest feel for the
vibration.
Joysticks may be used together for simultaneous operation, to achieve combinations of
movements. Some controls must be used together. For instance, the boom telescope and
the hoist controls must be used together to maintain clearance between boom and load line
hook. Full speed operation of all boom functions is allowed when the crane is set up on
outriggers, leveled to +/-3°, and the RCL is running in the normal mode.
Outriggers:
A 12-button pad is mounted to the left-hand dash panel for controlling the direction of
outriggers on each corner of the machine. Eight buttons are paired together giving two
directions for each outrigger. Engaging the lower side of the button will deploy the
associated outrigger while engaging the upper side of the button will stow the associated
outrigger. All four outrigger button pairs may be operated simultaneously or individually.
Outrigger alarms will sound when deploying any of the outriggers.
CAUTION
Special attention must be given to avoid hitting personnel or obstacles.
NOTICE
Avoid holding a joystick lever or outrigger button in the activated position after the
function has reached the end of its travel. This will impose unnecessary stresses on
the hydraulic components and heat the hydraulic system.