BOOM RT540E SERVICE MANUAL
4-2 Published 4-20-2015, Control # 502-01
BOOM SYSTEM COMPONENTS
Telescope Cylinder
The telescope cylinder is attached to the boom in three
places: Refer to Figure 4-1 for item location.
• The outer rod end (1) of the telescope cylinder is
secured to the boom base section (2)
• The inner rod end (3) is secured to the inner mid section
(4)
• The cylinder barrel (5) is secured to the outer mid
section (6)
Fly Section Extension Cables
The fly section has five extension cables (7) attached to it.
Refer to Figure 4-1 for item location.
The extension cables (7) are secured to the inner mid
section (8) and are routed around a five groove sheave
assembly (9) at the barrel end (boom nose) of the telescope
cylinder (10). These cables are secured at the base end of
the fly section (11).
Extend Synchronizing Cable
Refer to Figure 4-1 for item location. The long extend
synchronizing cables (12) are connected to the rear of the
outer mid section (6) and is routed around two sheaves (11)
on the top front of the inner mid (4), and secured to the rear
of the base section (13).
Fly Retraction Cables
Refer to Figure 4-1 for item location. The two retraction
cables (14) are secured at the outside front of the inner mid
section (4), are routed around sheaves (15) mounted on the
end of the outer mid section (6) and are secured at the
opposite end (16) to the fly section (17).
Outer Mid Retract Cables
Refer to Figure 4-1 for item location. The four retraction
cables (18) are secured at the outside front of the base
section (2), are routed around sheaves (19) mounted on the
end of the inner mid section (4) and are secured (20) at the
opposite end to the outer mid section (6).
BOOM EXTENSION SEQUENCE
Refer to Figure 4-1 for item location. As the telescope
cylinder extends, the cylinder barrel (5), which is attached to
the outer mid section (6), and the inner cylinder rod (3) which
is attached to the inner mid section (4), pulls the mid sections
out along with it.
At the same time, the five groove sheave assembly (9) at the
nose end of the telescope cylinder pulls on the five fly
extension cables around it. This causes the fly section (17)
and mid sections (6, 4) to deploy at the same time and rate.
The long extend synchronizing cable (12) ensures the mid
sections and the telescope cylinder remain in
synchronization.
DANGER
To prevent serious injury or death, always wear personal
protective equipment; i.e., a hard hat, eye protection,
gloves and metatarsal boots.
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