SJIII Compacts & Conventionals
December 2007 Page 15
Section 2 - Operation Major Assemblies
2.3 Major Assemblies
The aerial platform consists of three major assemblies:
base, lifting mechanism and platform.
2.3-1 Base
The base is a rigid, one-piece weldment which supports
two swing out trays.
On Models 3215 and 3219 (Compacts):
One tray contains the hydraulic and electrical
components. The other tray contains four (4) 6 volt
batteries. The charger is located at the rear of the
aerial platform. The front axle has two hydraulic
motor-driven wheels, steerable by a hydraulic
cylinder. The rear axle is fixed and has non-driven,
spring-applied, hydraulically released brake.
On Models 3220, 3226, 4620, 4626 and
4632 (Conventionals):
One tray contains the hydraulic and electrical
components. The other tray contains battery
charger and four (4) 6 volt batteries. The front axle
has two non-driven wheels, steerable by a hydraulic
cylinder. The rear axle has two hydraulic motor-
driven wheels with spring-applied, hydraulically
released brakes.
2.3-2 Lifting Mechanism
The lifting mechanism is constructed of formed steel or
tube sections making up a 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.
2.3-3 Platform
The platform is constructed of a tubular support frame,
a skid-resistant “diamond plate” deck surface and 1.1 m
hinged guardrails with 0.15 m 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.
2.4 Serial Number Nameplate
The serial number nameplate, located at the rear of the
aerial platform, lists the following:
Model number•
Serial number•
Capacity and maximum number of persons •
permissible on the platform
Maximum wind speed•
Maximum manual force•
Machine weight•
Drive height•
Platform height•
System pressure•
Lift pressure•
Wheel load•
Voltage•
Maximum incline•
Year of manufacture•
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