Broderson IC-280-A, Accompaniment To The Installation, Operation And Maintenance Manual

Page: 25 / 75

2-9
CONTROL VALVE FUNCTIONS
The controls for operating the outriggers, boom rotation, boom elevation, boom extension
and hoist are located along the forward dashboard area. The control handles are directly
connected to the 3-position hydraulic valves. The placard located next to these handles
identifies the function and direction resulting from each handle movement.
1. Swing or Slewing: Pulling back on the lever will rotate the boom to the operator's left;
pushing forward will rotate it to the operator's right.
2. Telescope: Pulling back on the lever will retract the boom; pushing forward will extend
the boom. Retract at a low to medium engine speed only. Overspeed will heat
hydraulic fluid and will not increase retraction speed .
3. Boom or Derricking: Pulling back will raise the boom; pushing forward will lower it.
4. Outriggers: The four outrigger levers may be operated simultaneously or individually.
Special attention must be given to avoid hitting personnel or obstacles. There are also
four toggle switches in front of the outrigger levers. These control the flow of the oil to
either the Beam Extension Cylinders or the Jack Extension Cylinders. Pushing switches
forward controls Beams In & Out. Pulling switches back controls Jacks Up & Down.
5. Front Winch ( Optional ): Pulling back will pay winch line in; pushing forward will pay
winch line out.
6. Hoist: Pulling back on the lever will raise the load line; pushing forward will lower the
load line.
All controls may be used 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.
Avoid holding a control lever in the open position after the function has reached the end of its
travel. This will impose unnecessary stresses on the components and heat the hydraulic
system.
THREE-MODE STEERING FUNCTIONS
The IC-280 is equipped with three-mode steering: Four-wheel round steering can be used
for making tight turns; two-wheel rear steering should be used for traveling long distances;
crab steering can be used for maneuvering in tight places. A switch on the dashboard sets
the mode. Electronic sensors and controls automatically align the wheels when a new mode
is selected, as the wheels are steered past the centered position. The steering wheel is
directly mounted to the steering control unit of the all-hydraulic power steering system. The
steering system will provide limited steering even if the engine should stop running.