OPERATING CONTROLS AND PROCEDURES 2250 OPERATOR MANUAL
3-26
Published 06-24-16, Control # 241-01
F—Boom/Luffing Hoist Controls
See Figure 3-4 for the following components.
NOTE: Drum 5 can also be used as an auxiliary hoist (load
drum). See Drum 5 Operation—Boom Hoist
Diverted on page 3-47 and Drum 5 Operation—
Travel diverted on page 3-48.
F1—Boom Hoist Handle
Both hoists—boom (drum 4) and luffing (drum 5)—have a
spring-applied, hydraulically released disc brake. The brake
will be spring-applied to stop the hoist if power is lost.
The boom/luffing hoist is controlled by a dual-axis control
handle. The dual-axis control handle allows the boom/luffing
hoist and swing to be operated at the same time with one
handle.
Move the handle to REAR to raise the boom or luffing jib. The
brake releases and the speed increases in relation to handle
movement.
Release the handle to CENTER to stop the boom or luffing
jib. Speed decreases until motionless, and the brake applies
to stop the boom or luffing jib and to hold the boom or jib in
position.
Move the handle to FRONT to lower the boom or luffing jib.
The brake releases and the speed increases in relation to
handle movement.
F2—Drum 4 Park Switch
The drum 4 park switch enables and disables boom hoist
operation. With the boom hoist park on, the boom hoist
handle is inoperable, and the boom hoist brake is applied to
hold the boom in position. The drum pawl is also engaged.
Press the top of the rocker switch to turn on the boom hoist
park and engage the drum pawl.
Press the bottom of the rocker switch to turn off the boom
hoist park (allowing the boom hoist to be operated) and
disengage the drum pawl.
F3—Drum 5 Park Switch
The drum 5 park switch enables and disables luffing hoist
operation. With the luffing hoist park ON, the luffing hoist
handle is inoperable and the luffing hoist brake is applied to
hold the luffing jib in position. The drum pawl is also
engaged.
Press the top of the rocker switch to turn on the luffing hoist
park and engage the drum pawl.
Press the bottom of the rocker switch to turn off the luffing
hoist park (allowing the luffing hoist to be operated) and
disengage the drum pawl.
G—Load Drum Controls
See Figure 3-4 for the following components.
Each load drum has a spring-applied, air-released,
band-type park brake. The brake will apply by spring force to
stop the load drum if power is lost.
Each load drum also has an air-applied, spring-released,
band-type working brake. The working brake can be applied
at any time to stop the load drum.
Full Power Mode (either load drum)
• The drum park brake applies when the drum handle is
released to OFF.
• The drum park brake releases when the drum handle is
moved in either direction from OFF.
• The drum clutch remains applied at all times to provide
Full Power operation.
Free Fall Mode (either load drum)
• The drum park brake remains released at all times.
• The drum clutch releases when the drum handle is
moved to OFF. Use the drum working brake to control
the load.
• The drum clutch applies when the drum handle is moved
in either direction from OFF to provide full power
operation (hoist and lower).
WARNING
Falling Load Hazard!
When operating in Free Fall, the load will lower
uncontrolled if the drum brake is not applied with the brake
pedal when the load drum handle is moved to OFF.
Be ready to apply the drum brake with the brake pedal so
lowering speed can be controlled and the load can be
stopped immediately when necessary.
CAUTION
Avoid Clutch/Motor Damage!
Do not move the load drum handle in either direction from
OFF while free falling a load. Serious damage to the drum
clutch and motor could result. Stop the load with the drum
working brake before moving the load drum handle in
either direction from OFF.
For the same reason, do not turn off Free Fall or turn on
the drum park while free falling a load. Stop the load with
the brake pedal. Then turn off Free Fall or turn on the
drum park.
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