Skyjack SJIII 4740, Operating Manual

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Section 3 - Operation Major Assemblies
3.3 Major Assemblies
The MEWP consists of three major assemblies: base,
lifting mechanism and platform.
3.3-1 Base
The base is a rigid, one-piece weldment which supports
two swing out trays:
The hydraulic/electric tray contains the hydraulic and
electrical components. The battery tray contains four
(4) 12 volt batteries and a 24V, 750W output charger.
The front axle has two hydraulic motor-driven wheels,
steerable by a hydraulic cylinder and steering links. The
rear axle is fixed and has non-driven wheels, spring-
applied, hydraulically released brakes.
3.3-2 Lifting Mechanism
The lifting mechanism is constructed of formed steel
or tube sections making up a 6-level scissor-type
assembly. The scissor assembly is raised and lowered
by single-acting hydraulic lift cylinders with holding
valves. A pump, driven by an electric motor, provides
hydraulic power to the lift cylinders.
3.3-3 Platform
The platform is constructed of a tubular support frame,
a skid-resistant “diamond plate” deck surface and 39”
hinged guardrails with 6” toe boards and mid-rails. The
platform can be entered from the rear through a spring-
returned gate with latch. The platform is also equipped
with a manual extension platform. An 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
• MEWP weight
• Maximum drivable height
• Maximum capacities
• Maximum number of persons permissible on the
platform
• Voltage
• System pressure
• Lift pressure
• Maximum platform height
• Maximum wheel load
• Date manufactured
SJIII 4740
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