Maeda MC285C-3 - Boom Telescoping Procedure; Slewing Operation; Safety Precautions

Section 4 – CRANE OPERATION Mini-Crawler Crane M A E D A
4-60 1/2019 MC285C-3
WARNING! Unsafe Operation Hazard. Do not
allow the hook block to contact the boom
when telescoping the boom. When
telescoping the boom, the hook block will
start to move toward the boom. Do not allow
the hook block to contact the boom. Damage
to the boom, hook block and/or wire rope
cables may result. Always maintain clearance
between the hook block and boom when
telescoping the boom.
WARNING! Unsafe Operation Hazard. Do not
continue to hoist a load if the overwind alarm
detector sounds. Stop the operation
immediately and return all operation levers to
the NEUTRAL position.
Boom Telescoping Procedure
When the boom is extended for a long period of
time, the boom retracts slightly due to the
temperature change in the hydraulic oil; extend
the boom as needed to adjust.
Move the boom telescoping lever (3) as follows:
Fig. 4-165
• Extend: Push the lever forward to EXTEND.
• Neutral: Release the lever. The lever returns to
the NEUTRAL position and boom telescoping
stops.
• Retract: Pull the lever toward you to RETRACT.
Adjust the boom telescoping speed with the boom
telescoping lever and the stroke of the accelerator
levers.
Slewing Operation
Safety Precautions
WARNING! Tip Hazard. Do not slew the crane
when overloaded. The machine will not stop
automatically if the crane is overloaded during
crane slewing operation.
WARNING! The following safety messages
address a potential Sudden Movement Hazard
while performing slewing operations:
• Do not pull a load sideways or draw it in
during crane slewing operation. These
conditions may cause unreasonable force
on the machine and uncontrollable
movement of the load.
Fig. 4-166
• Always start a slewing operation slowly and
stop gently. Move the slewing lever slowly
and consistently throughout the operation.
Blow the horn to signal operations are to
begin.
• Always use caution when performing a
slewing operation. Even if the outriggers are
set properly, some directions have lower
stability when performing 360-degree
slewing.
Fig. 4-167
WARNING! Tip Hazard. Never allow a load to
contact an outrigger during a slewing
operation. Always use caution to prevent the
hoisted load from contacting an outrigger.