BOOM RT530E-2 SERVICE MANUAL
4-2 Published 4-22-15, Control # 556-00
mounted on the end of the outer mid section and are secured
at the opposite end to the fly section. The six retraction
cables are secured at the outside front of the base section,
are routed around sheaves mounted on the end of the inner
mid section and are secured at the opposite end to the outer
mid section.
As the telescope cylinder extends, the cylinder barrel, which
is attached to the outer mid section and the inner cylinder rod
which is attached to the inner mid section, pulls the mid
sections out along with it. At the same time, the five groove
sheave assembly at the end of the telescope cylinder pulls
on the five fly extension cables around it. This causes the fly
extension cables to pull the fly section out at the same time
and rate that the telescope cylinder is pulling out the mid
sections. The long extend synchronizing cable ensures the
mid sections and the telescope cylinder remain in
synchronization.
Boom Retraction
The four fly retraction cables are secured at the outside front
of the inner mid section, are routed around sheaves mounted
on the end of the outer mid section and are secured at the
rear end to the fly section. The six outer mid retraction cables
are secured at the outside front of the base section, are
routed around sheaves mounted on the end of the inner mid
section and are secured at the rear end to the outer mid
section. As the telescope cylinder is retracted, the outer mid
section, which is secured to the cylinder barrel and the inner
mid section, which is secured to the inner cylinder rod, are
pulled in. At the same time, the sheaves at the rear of the mid
sections pull on the four fly and six outer mid retraction
cables around the sheaves. This causes the retraction
cables to pull the fly section and the outer mid section in at
the same time and rate the telescope cylinder is pulling in the
mid sections and the telescope cylinder stages remain in
synchronization.
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