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SECTION 1, Page 1

SJKB-40-D, SJKB-40-D/F

JUN. 1999

SECTION 1

INTRODUCTION

PURPOSE OF EQUIPMENT

The SKYJACK SJKB Boom Work Platforms are designed
to transport and raise personnel and tools to overhead
work areas.

USE OF EQUIPMENT

The work platforms (Figure 1-2) are highly maneuverable
work stations. The SJKB-40-D/F and -40-D Models are
designed for both slab-type and rough terrain construction
applications. Lifting and elevated driving these models
MUST be on a flat, level, compacted surface.

WARNINGS

The operator MUST read and completely understand the
front panel labels (Figures 1-1) and ALL other warnings
in this manual and on the work platform. Compare the
labels on the work platform with the labels found
throughout Sections 1 and 2 of this manual. If any labels
are damaged or missing, replace them immediately.

DESCRIPTION

The work platform consists of four major assemblies,
the platform, boom assembly, turret and drive chassis.
An operator’s control console is located on the platform.
A foot switch on the platform enables and disables the
platform controls. Auxiliary base controls are located in
the electric panel located on the rotating turret.

PLATFORM - The platform is constructed of a skid-
resistant see-thru deck surface and a 42" high tubular
steel railing system with midrails and 6" toe boards. The
platform can be entered through a sliding midrail bar at
the center of the railing system or optional hinged gate.
The platform can be rotated 90 degrees from center in
either direction. A 110 VAC GFI outlet is also located on
the platform.

BOOM ASSEMBLY - The boom is mounted on the turret
and consists of a 4 foot hydraulic boom jib, telescoping
boom assembly and riser arm. This mechanism uses
double-acting hydraulic cylinders with holding valves to
control vertical movement. Manual lowering valves at
the base of the main boom and jib cylinders allow the
mechanism to lower in the event of an emergency or
electrical system failure.

TURRET - The turret rotates 360 degrees continuously.
On each side of the turret is an enclosure. One with
hinged doors that contains the swing out engine tray,
emergency pump, brake manifold and access to the turret
transportation lock and battery. The other enclosure
contains the fuel tank, the hydraulic fluid tank and the
electrical panel.

DRIVE CHASSIS - The chassis assembly consists of a
rigid one piece weldment and one of the following axle
configurations.
Standard 2WD machines have a straight front axle with
two non-driven wheels, steerable by a double acting
hydraulic cylinder and an hydraulic motor driven rear axle
with spring applied hydraulically released parking brakes.
Optional 4WD machines have a hydraulic motor driven,
rigid drive axle in the rear. The steer axle is coupled to the
rear with a drive shaft. The driven steer axle has an
integrated double acting hydraulic cylinder for steering.
Both axles have spring applied hydraulically released
parking brakes. Machines equipped with the Dual Fuel
Option have LP tank mounting brackets on the side of the
chassis weldment.

PLATFORM CONTROL CONSOLE - Located on the
platform, this control station contains controls for work
platform motion and emergency stopping. Also controls
for engine operation and emergency pump operation.

OPTIONAL ACCESSORIES - The SKYJACK SJKB
Boom Work Platforms are designed to accept a variety
of optional accessories. These are listed in Specifications
and Features found in this section. Operating instructions
for these options (if required) can be found in Section 2
of this manual.

DEC. 1999

SECTION 2, Page 8

SJKB-40-D, SJKB-40-D/F

JUN. 1999

WARNING

DO NOT operate any control on the operator’s control
console without your safety devise fastened and properly
securing the safety lanyard to the platform lanyard rings.
Failure to avoid this hazard could result in death or
serious injury!

Attach the safety lanyards of each occupant to
the platform lanyard rings.

Pull out the Emergency Stop Button.

For gas engine machines equipped with the Dual
Fuel Option. Select the desired fuel source.

When the engine is cold, press and hold the
Engine Choke Toggle Switch to the “

“

(right) position while starting engine. Release
switch once the engine starts (Kubota gas
engines) or press and hold Glow Plug Toggle
Switch to the “

“ (right) position for 15 to 20

seconds, then release (Diesel engines).

Turn Engine Stop/Run/Start Select Switch to the
“ ” (start) position until engine starts, then
release. DO NOT over crank the starter. (If
engine fails to start after multiple attempts,
consult the TROUBLE SHOOTING section in
the Operational Maintenance and Parts Manual).
NOTE Engine will not start if foot switch is
depressed.

10.

Select desired engine RPM using the Engine
Speed Select Switch.

REMEMBER

The following controls on the Operator’s Control
Console WILL NOT operate unless the Foot Switch is
depressed and held.

NOTE

When the operator is positioned over an axle, the
direction the operator is facing will be FORWARD!

11.

TO DRIVE FORWARD: Slowly move the Drive/
Steer Controller handle to the “

“ (forward)

position. Release controller handle to stop.

12.

TO DRIVE IN REVERSE: Slowly move the
Drive/Steer Controller handle to the “

“

(reverse) position. Release controller handle to
stop.

13.

TO STEER: Depress the rocker on the Drive/
Steer Controller handle in the direction you wish
to steer.

14.

TO ADJUST BOOM FUNCTION SPEED: Turn
the Boom Speed Control Knob counter-clockwise
to decrease function speed or clockwise to
increase funtion speed. The Boom Speed Control
will affect all lifting, lowering and rotate functions
but will not affect drive or steer speed.

15.

TO MOVE THE JIB UPWARD: Press and hold
the Jib Up/Down Toggle Switch to the “

“

(up) position. Release the switch to stop.

16.

TO MOVE THE JIB DOWNWARD: Press and
hold the Jib Up/Down Toggle Switch to the “

“

(down) position. Release the switch to stop.

17.

TO MOVE THE RISER UPWARD: Press and
hold the Riser Up/Down Toggle Switch to the
“

“ (up) position. Release the switch to

stop.