Page 50 December 2007
SJ46AJ SJ51AJ SJ63AJ
Major Assemblies Section 3 - Operation
3.3 Major Assemblies
The MEWP 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. The rear axle is coupled to the front
axle by a drive shaft.
3.3-2 Turret
For models SJ4 6A J/ SJ51AJ, serial numbe rs
95000853 to 95002084, the turret rotates 360 degrees
continuously. For models SJ46AJ/SJ51AJ, serial
numbers 95002085 and above, the turret rotates
355 degrees non-continuously. For model SJ63AJ, the
turret rotates 360 degrees continuously. Upon the turret
are two compartments. One compartment contains
the engine, hydraulic pumps and battery. The swing
drive is in the center of the turret underneath the main
boom. 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 assembly consists of the riser, telescoping y
and main boom assembly. The riser is mounted on the
turret with the main boom attached to the riser. The riser
mechanism uses two double-acting hydraulic cylinders
with holding valves to control vertical movement. SJ46AJ
and SJ51AJ models are equipped with a 152 cm (60
in.) jib, controlled by a double-acting hydraulic cylinder.
SJ63AJ model is equipped with a 168 cm (66 in.) 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 110 cm
(43 in.) high tubular steel railing system with mid rails
and 15 cm (6 in.) toe boards. The platform can be
entered through a swing gate at the side of the railing
system. The platform can be rotated in either direction.
An optional AC outlet is also located on the platform.
3.4 Serial Number Nameplate
The serial number nameplate, located at the rear of the
MEWP, lists the following:
• Model number
• Registration number
• Serial number
• Maximum capacities
• Maximum number of persons permissible on the
platform
• Maximum manual force
• MEWP weight
• Maximum drivable height
• Maximum platform height
• System pressure
• Lift pressure
• Maximum wheel load
• Maximum wind speed
• Voltage
• Maximum chassis inclinations
• Date manufactured
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