SJ 63AJ
December 2007
Page 47
Section 3 - Operation
Major Assemblies
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
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 fly
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.
AJ models are 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
• 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 inclination of chassis
