Elevating the Boom. To elevate boom, BOOM control lever or foot treadle is "pulled back" toward
operator, to UP position and held until boom reaches desired elevation angle. An interconnected floor
treadle provides foot operation capability.
Lowering the Boom. To lower boom, BOOM control lever or foot treadle is "pushed forward", away from
operator, to DOWN position and held until boom is lowered to desired position.
CAUTION
WHEN LOWERING BOOM, LET OUT
CABLE
SIMULTANEOUSLY
TO
PREVENT TWO-BLOCKING BOOM
NOSE AND HOOK BLOCK.
THE CLOSER THE LOAD IS CARRIED
TO BOOM NOSE, THE MORE
IMPORTANT
IT
BECOMES
TO
SIMULTANEOUSLY LET OUT CABLE
AS BOOM IS LOWERED.
WARNING
BEFORE LOWERING BOOM, MAKE CERTAIN AREA BENEATH BOOM IS CLEAR OF ALL
OBSTRUCTIONS AND PERSONNEL.
LONG CANTILEVER BOOMS CAN CREATE A TIPPING CONDITION WHEN IN EXTENDED AND
LOWERED POSITIONS. RETRACT BOOM PROPORTIONALLY WITH REFERENCE TO CAPACITY
OF APPLICABLE LOAD CHART.
EMERGENCY PROCEDURE: ALTHOUGH HIGHLY IMPROBABLE IF PROPER MAINTENANCE AND
FREQUENT INSPECTIONS ARE ACCOMPLISHED, THERE REMAINS THE POSSIBILITY THAT THE
HYDRAULIC EQUALIZER LINE COULD FAIL. IF THIS OCCURS THERE ARE RESTRICTING
DEVICES PROVIDED THAT WILL ALLOW CONTINUED OPERATIONS OF THE CRANE. ALL CRANE
FUNCTIONS
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