SERVICE 1400H OPERATOR AND SERVICE MANUAL
5-18 Published 10-30-2014 Control # 040-09
FOUR SECTION BOOM
The boom service and maintenance section of this
manual includes both the four and five section boom
information. Use appropriate information for your particular
boom length.
A rod-fed, two-stage double-acting cylinder, attached to
the 1st, 2nd and 3rd boom sections, supports and propels
the 2nd and 3rd boom sections. The extend cables attach to
the base end of the 2nd boom section, are reeved around
sheaves attached to the cylinder, and attach to the base end
of the 4th boom section, therefore providing support and
extension of the 4th boom section. The 3rd section retract
cables attach to the tip end of the 1st boom section, are
reeved around sheaves attached to the 2nd boom section,
and attach to the base end of the 3rd boom section, therefore
providing retraction of the 3rd boom section. The 4th section
retract cables attach to the tip end of the 2nd boom section,
are reeved around sheaves attached to the 3rd boom
section, and attach to the base end of the 4th boom section,
therefore providing retraction of the 4th boom section. A
proportioning cable attached to the rear of the 1st section,
reeved around a sheave at the tip of the 2nd section, and
anchored to the rear of the 3rd section maintain proper
cylinder extension proportion, therefore maintaining equal
boom section proportion Detailed service and maintenance
is required to insure smooth and proper operation.
BASE
1/2/3 EXTEND
TIP
1ST STAGE
3/2/1 RETRACT
2/3/4 EXTEND
2ND STAGE
3RD STAGE
4TH STAGE
4/3/2 RETRACT
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