SKYJACK, Page 15SJIII Compacts & Conventionals
February 2008
Section 2 - Operation
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.
Pothole Protection:
A mechanically actuated angle, located under
the outside of the trays, rotates when lifting.
This mechanism provides pothole protection for
elevated driving (except models 6826 and 6832).
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 one spring-
applied hydraulically released brake.
On Models 3220, 3226, 3220M, 3226M,
4620, 4626, 4632, 6826 and 6832
(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 and two 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 two-section
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
1110mm hinged guardrails with 152mm 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. A
220 volt 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•
Aerial platform 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•
Maximum wind speed •
Maximum manual force•
Maximum incline•
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