National Crane Published 10-30-2014 Control # 040-09 5-25
1400H OPERATOR AND SERVICE MANUAL SERVICE
FIVE SECTION BOOM
A two-stage, rod fed, double-acting cylinder is attached
to and supports the 1st, 2nd and 3rd stage boom sections.
The 3/4/5 extend cables attach to the base of the 3rd stage
boom, are reeved around sheaves at the tip of the 4th stage
boom and attach to the base and support the 5th stage
boom. The 5/4/3 retract cables are attached to the base of
the 5th stage boom, are reeved around sheaves at the base
of the 4th stage boom and attach to the tip of the 3rd stage
boom. The 2/3/4 extend cables attach to the base of the 2nd
stage boom, are reeved around sheaves at the tip of the 3rd
stage cylinder and attach to the base and support the 4th
stage boom. The 4/3/2 retract cables are attached to the
base of the 4th stage boom, are reeved around sheaves at
the base of the 3rd stage boom and attach to the tip of the
2nd stage boom. The 11213 extend cables attach to the base
of the 1st stage boom, are reeved around sheaves at the tip
of the 2nd stage boom and attach to the base of the 3rd
stage boom. The 3/2/1 retract cables attach to the base of
the 3rd stage boom, are reeved around sheaves at the base
of the 2nd stage boom and attach to the tip of the 1st stage
boom.
The 3/2/1 retract cables directly oppose the 1/2/3 extend
cables to ensure that the 2nd and 3rd stage booms extend
and retract equally at all times. The 4/3/ 2 retract cables
directly oppose the 2/3/4 extend cables to ensure that the
3rd and 4th stage booms extend and retract equally at all
times. The 5/4/3 retract cables directly oppose the 3/4/5
extend cables to ensure that the 4th and 5th stage booms
extend and retract equally at all times.
1/2/3 EXTEND
1ST STAGE
3/2/1 RETRACT
2/3/4 EXTEND
2ND STAGE
3RD STAGE
5TH
STAGE
4/3/2 RETRACT
3/4/5 EXTEND
4TH STAGE
5/4/3 RETRACT
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