Section 3 - Operation Major Assemblies
3.3 Major Assemblies
The aerial platform consists of four major assemblies:
the base, turret, boom assembly and platform.
3.3-1 Base
The base is a rigid one-piece weldment. Models
equipped with dual-fuel engine have mounting straps
for propane tank on each side. The rear axle is hydraulic
motor-driven and has a spring-applied, hydraulically
released brakes. The front axle is steerable by a
hydraulic cylinder.
4WD Models:
The rear axle is coupled to the front axle by a
drive shaft.
2WD Models:
The front axle has two non-driven wheels.
3.3-2 Turret
The turret rotates 360 degrees continuously. Upon
the turret are two compartments. One compartment
contains the engine, hydraulic pumps, battery and swing
drive. The other compartment contains the base control
console, main hydraulic manifold, function valves, the
hydraulic and fuel tanks.
3.3-3 Boom Assembly
The boom is mounted on the turret and consists of a
telescoping y and main boom assembly. Model 66T
has an additional mid boom section. The telescoping
boom mechanism uses two double-acting hydraulic
cylinders with holding valves to control vertical
movement. Cables are used to extend the y boom
section in the 66T model. SJ 45T & SJ 66T models are
equipped with a 60 in. (150 cm) boom jib, controlled
by a double-acting hydraulic cylinder.
3.3-4 Platform
The platform is constructed of a skid-resistant deck
surface allowing visibility through the deck and a 43 in.
(109 cm) high tubular steel railing system with mid
rails and 6 in. (15 cm) toe boards. The platform can be
entered through a swing side gate or an optional swing
gate at the center of the railing system. The platform can
be rotated in either direction. An AC GFI outlet is also
located on the platform.
3.4 Serial Number Nameplate
The serial number nameplate, located at the rear of the
aerial platform, lists the following:
• Model number
• Serial number
• Maximum capacities
• Maximum number of persons permissible on the
platform
• Maximum manual force
• Aerial platform weight
• Maximum drivable height
• Maximum platform height
• System pressure
• Lift pressure
• Maximum wheel load
• Voltage
SJ 40T & SJ 45T
SJ 61T & SJ 66T
Page 45
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