Snorkel SL20 User manual

Operator’s
Manual
P/N 300206
October, 1998
battery powered
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Electrical Hazard
The aerial platform is not electrically insulated. Death or serious injury can result
from contact with, or inadequate clearance from, an energized conductor.
Do not go closer than the minimum safe approach distance as defined by the
Minimum Safe Approach Distance section in Chapter 3–Safety.
Regard all conductors as energized.
Allow for electrical wire sag and aerial platform sway.
If the platform, scissors structure, or any part of the aerial platform contacts a high-voltage electrical
conductor, the entire machine can become electrically charged.
If that happens, remain on the machine and do not contact any other structure or object. This includes
the ground, adjacent buildings, poles, and any other objects that are not part of the aerial platform.
Such contact could make your body a conductor to the other object, creating an electrical shock hazard
resulting in death or serious injury.
If an aerial platform is in contact with an energized conductor the platform operator must warn ground
personnel in the vicinity to stay away. Their bodies can conduct electricity creating an electrical shock
hazard resulting in death or serious injury.
Do not approach or leave the aerial platform until the electricity has been turned off.
Do not attempt to operate the lower controls when the platform, scissors structure, or any part of the
aerial platform is in contact with a high-voltage electrical conductor or if there is an immediate danger
of such contact.
Personnel on or near an aerial platform must be continuously aware of electrical hazards, recognizing
that death or serious injury can result from contact with an energized conductor.
SL 20 – 300206
DANGER
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Table of Contents
Chapter 1. Introduction
Safety Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Manual of Responsibilities. . . . . . . . . . . . . . . . 1-2
Additional Information . . . . . . . . . . . . . . . . . . . 1-2
Chapter 2. Specifications
Component Identification. . . . . . . . . . . . . . . . . 2-1
General Specifications. . . . . . . . . . . . . . . . . . . 2-2
Chapter 3. Safety
Electrocution Hazards . . . . . . . . . . . . . . . . . . . 3-1
Minimum Safe Approach Distance . . . . . . . 3-1
Prestart Inspection . . . . . . . . . . . . . . . . . . . . . 3-2
Work Place Inspection and Practices . . . . . . . 3-2
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Tip-Over and Falling Hazards . . . . . . . . . . . . . 3-3
Electrical System. . . . . . . . . . . . . . . . . . . . . . . 3-3
Hydraulic System. . . . . . . . . . . . . . . . . . . . . . . 3-3
Placards and Decals . . . . . . . . . . . . . . . . . . . . 3-3
Chapter 4. Safety Devices
Emergency Stop Controls . . . . . . . . . . . . . . . . 4-1
Drive Motion Alarm . . . . . . . . . . . . . . . . . . . . . 4-1
Lowering Alarm . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Pothole Protector Skids. . . . . . . . . . . . . . . . . . 4-2
Drive/Lift Pothole Protector Interlock. . . . . . . . 4-2
Drive/Lift Level Sensor Interlock . . . . . . . . . . . 4-2
Guardrails . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Emergency Lowering Handle . . . . . . . . . . . . . 4-3
Safety Prop . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Flashing Light . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Lanyard Anchors . . . . . . . . . . . . . . . . . . . . . . . 4-4
Horn. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Electrical Power Outlet . . . . . . . . . . . . . . . . . . 4-4
Chapter 5. Gauges
Hour Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Ammeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Battery Condition Indicator . . . . . . . . . . . . . . . 5-1
Chapter 6. Batteries
General Maintenance . . . . . . . . . . . . . . . . . . . 6-1
Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Chapter 7. Controls
Lower Controls. . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Battery Disconnect Switch . . . . . . . . . . . . . 7-1
Emergency Stop Switch . . . . . . . . . . . . . . . 7-1
Control Selector Switch. . . . . . . . . . . . . . . . 7-1
Platform Raise/Lower Switch . . . . . . . . . . . 7-1
Circuit Breaker Reset Button. . . . . . . . . . . . 7-1
Low Voltage Warning Light . . . . . . . . . . . . . 7-1
Upper Controls . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Emergency Stop Button . . . . . . . . . . . . . . . 7-2
Drive/Lift Selector Switch . . . . . . . . . . . . . . 7-2
Joystick . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Interlock . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Steer Switch . . . . . . . . . . . . . . . . . . . . . . 7-2
Low Voltage Warning Light . . . . . . . . . . . . . 7-3
Horn Button. . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Battery Condition Indicator . . . . . . . . . . . . . 7-3
Chapter 8. Prestart Inspection
Operator’s Manual. . . . . . . . . . . . . . . . . . . . . . 8-2
Electrical System. . . . . . . . . . . . . . . . . . . . . . . 8-2
Battery Fluid Level . . . . . . . . . . . . . . . . . . . 8-2
Battery Terminals . . . . . . . . . . . . . . . . . . . . 8-2
Battery Charger. . . . . . . . . . . . . . . . . . . . . . 8-2
Cables and Wiring Harness . . . . . . . . . . . . 8-3
Hydraulic System. . . . . . . . . . . . . . . . . . . . . . . 8-3
Fluid Level. . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Hoses, Tubes, and Fittings . . . . . . . . . . . . . 8-3
Free-Wheeling Valve. . . . . . . . . . . . . . . . . . 8-4
Tires and Wheels. . . . . . . . . . . . . . . . . . . . . . . 8-4
Parking Brakes . . . . . . . . . . . . . . . . . . . . . . 8-4
Ground Strap. . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Lower Control Station . . . . . . . . . . . . . . . . . . . 8-4
Operating Controls . . . . . . . . . . . . . . . . . . . 8-4
Emergency Stop . . . . . . . . . . . . . . . . . . . . . 8-5
Lowering Alarm. . . . . . . . . . . . . . . . . . . . . . 8-5
Pothole Protector Interlock . . . . . . . . . . . . . . . 8-5
Level Sensor Interlock. . . . . . . . . . . . . . . . . . . 8-6
Emergency Lowering. . . . . . . . . . . . . . . . . . . . 8-6
Safety Prop . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Flashing Light . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Weldments . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Rollers and Slide Blocks . . . . . . . . . . . . . . . 8-7
Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Upper Control Station . . . . . . . . . . . . . . . . . . . 8-8
Guardrail System . . . . . . . . . . . . . . . . . . . . 8-8
Platform Extension . . . . . . . . . . . . . . . . . . . 8-8
Operating Controls . . . . . . . . . . . . . . . . . . . 8-8
Emergency Stop . . . . . . . . . . . . . . . . . . . . . 8-9
Lowering Alarm. . . . . . . . . . . . . . . . . . . . . . 8-9
Drive Motion Alarm . . . . . . . . . . . . . . . . . . . 8-9
Battery Condition Indicator . . . . . . . . . . . . . 8-9
Lanyard Anchors. . . . . . . . . . . . . . . . . . . . . 8-9
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Electrical Power Outlet . . . . . . . . . . . . . . . . 8-9
Placards and Decals . . . . . . . . . . . . . . . . . . . 8-10
SL 20 – 300206
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Chapter 9. Operation
Preparing for Operation. . . . . . . . . . . . . . . . . . 9-1
Lower Controls. . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Upper Controls . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Driving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Drive Speeds . . . . . . . . . . . . . . . . . . . . . 9-2
Drive/Lift Level Sensor Interlock. . . . . . . 9-2
Steering. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Platform. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Raising and Lowering. . . . . . . . . . . . . . . 9-3
Extending . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Swing-Out Trays . . . . . . . . . . . . . . . . . . . . . . . 9-4
Electrical Power Outlet . . . . . . . . . . . . . . . . . . 9-4
Chapter 10. Stowing and Transporting
Stowing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Transporting. . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Winching . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Driving. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Hoisting. . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Lifting With a Forklift . . . . . . . . . . . . . . . . . 10-2
Securing for Transport. . . . . . . . . . . . . . . . 10-3
Chapter 11. Emergency Operation
Emergency Lowering. . . . . . . . . . . . . . . . . . . 11-1
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Chapter 12. Troubleshooting
Troubleshooting Chart . . . . . . . . . . . . . . . . . . 12-1
Appendix A. Glossary
SL 20 – 300206
Table of Contents
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Chapter 1. Introduction
The aerial platform is a self-propelled scissors lift
used to raise personnel, their tools, and material
to the workstation. The platform is raised and
lowered with a hydraulic cylinder. Hydraulic
motors on each of the front drive wheels provide
power to move the aerial platform.
The aerial platform has been manufactured to
conform to all applicable requirements of the
following organizations.
●Occupational Safety and Health
Administration (OSHA)
●American National Standards Institute (ANSI)
●Canadian Standards Association (CSA)
This manual provides information for safe and
proper operation of the aerial platform. Read and
understand the information in this manual before
operating the aerial platform on the job.
Additional copies of this manual may be ordered
from Snorkel. Supply the model and manual part
number from the front cover to assure that the
correct manual will be supplied.
All information in this manual is based on the
latest product information at the time of
publication.Snorkel reserves the right to make
product changes at any time without obligation.
■Safety Alerts
A safety alert symbol is used throughout this
manual to indicate danger and caution
instructions. Follow these instructions to reduce
the likelihood of personal injury and property
damage.The terms danger and caution indicate
varying degrees of personal injury or property
damage that can result if the instruction is not
followed.
Indicates a situation which if not avoided can
result in death or serious injury.
Indicates a situation which if not avoided can
result in minor injury or property damage.
■Notes
Notes are used to provide special information or
helpful hints to assist in aerial platform operation, but
do not indicate a hazardous situation.
■Options
This manual provides information about the
following options even though some machines
may not be equipped with them.
●Horn
●Flashing light
●Lanyard anchors
●Swinging platform gate
●240 amp/hour batteries
●AC generator
●Battery condition indicator
●Electrical power outlet with ground fault circuit
interrupter
■Operation
The aerial platform has built-in safety features
and has been factory tested for compliance with
Snorkel specifications and industry standards.
However, any personnel lifting aerial platform can
be potentially dangerous in the hands of
untrained or careless operators.
The potential for an accident increases when
the aerial platform is operated by personnel
who are not trained and authorized. Death or
serious injury can result from such accidents.
Read and understand the information in this
manual and on the placards and decals on the
machine before operating the aerial platform
on the job.
Training is essential and must be performed by a
qualified person. Become proficient in knowledge
and actual operation before using the aerial
platform on the job.You must be authorized to
operate the aerial platform.
The operator bears ultimate responsibility for
following all manufacturer's instructions and
warnings, regulations and safety rules of their
employer and/or any state or federal law.
SL 20 – 300206 page 1 - 1
DANGER
CAUTION
DANGER
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■Maintenance
Every person who maintains, inspects, tests, or
repairs the aerial platform must be qualified and
authorized to do so. Following the daily prestart
inspection in this Operator’s Manual will help
keep the aerial platform in optimum working
condition. Other maintenance functions must be
performed by maintenance personnel who are
qualified to work on the aerial platform.
Do not modify this aerial platform without prior
written consent of the Snorkel Engineering
Department.Modification may void the warranty,
adversely affect stability, or affect the operational
characteristics of the aerial platform.
■Manual of Responsibilities
All owners and users of the aerial platform must
read, understand, and comply with all applicable
regulations.Ultimate compliance to OSHA
regulations is the responsibility of the user and
their employer.
ANSI publications clearly identify the
responsibilities of all personnel who may be
involved with the aerial platform. A reprint of the
“Manual of Responsibilities for Dealers, Owners,
Users, Operators, Lessors and Lessees of
ANSI/SIA A92.6-1990 Self-Propelled Elevating
Work Platforms” is available from Snorkel dealers
or from the factory upon request.
Copies are also available from:
Scaffold Industry Association
20335 Ventura Blvd. Suite 310
Woodland Hills, CA 91364-2471 USA
■Additional Information
For additional information contact your local
dealer or Snorkel at:
Snorkel International, Inc.
P.O. Box 1160
St. Joseph, MO 64502-1160 USA
816-364-0317
page 1 - 2 SL 20 – 300206
Chapter 1. Introduction
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Chapter 2. Specifications
■Component Identification
SL 20 – 300206 page 2 - 1
78.5 in
199.4 cm
90 in
228.6 cm
71 in
180.3 cm
91 in
231.1 cm
3.25 in - 8.3 cm Platform Lowered
0.75 in - 1.9 cm Platform Raised
Guardrails
Platform Extension
Upper Controls
Platform
Scissors
Structure
Chassis
Toeboards
36 in
91.4 cm
Front (Steer)
Hydraulic Tray (Right Side)
Battery Tray (Left Side)
Pothole
Protector Skid Lower Controls
Rear
33 in
83.8 cm
30 in
76.2 cm
Operator’s
Manual Holder
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■General Specifications
Maximum platform height . . . . . . . . . . . 20¢(6.1 m)
Working height . . . . . . . . . . . . . . . . . . . 26¢(7.9 m)
Platform size
Main . . . . . . . . . . 30²x90²(76.2 cm x 228.6 cm)
Extension. . . . . . . . . 24²x36²(61cmx91.4cm)
Platform rated work load
Total. . . . . . . . . . . . . . . . . . . . . . . 800 lb (363 kg)
Platform extension . . . . . . . . . . . . 250 lb (113 kg)
Weight (GVW approx.) . . . . . . . 3,750 lb (1,701 kg)
Drive
Speed #1, elevated . . . . . . . . . 0.4 mph (0.6 kph)
Speed #2, stowed . . . . . . . . . . 1.2 mph (1.9 kph)
Speed #3, stowed . . . . . . . . . . 2.0 mph (3.2 kph)
Gradeability. . . . . . . . . . . . . . . . . . . . . . . . . . . 20%
Platform function speed
Platform raise
Speed #1. . . . . . . . . . . . . . . . . . . . . . . . 85 sec
Speed #2. . . . . . . . . . . . . . . . . . . . . . . . 35 sec
Speed #3. . . . . . . . . . . . . . . . . . . . . . . . 20 sec
Platform lower . . . . . . . . . . . . . . . . . . . . . 42 sec
Turning radius
Inside. . . . . . . . . . . . . . . . . . . . . . . 30²(76.2 cm)
Outside . . . . . . . . . . . . . . . . . . . 101²(256.5 cm)
Overall length . . . . . . . . . . . . . . . . . 91²(231.1 cm)
Overall width . . . . . . . . . . . . . . . . . . . 33²(83.8 cm)
Overall height, stowed . . . . . . . . . 78.5²(199.4 cm)
Guardrail height
Platform . . . . . . . . . . . . . . . . . . . . 41²(104.1 cm)
Platform extension . . . . . . . . . . . . 40²(101.6 cm)
Toeboard height . . . . . . . . . . . . . . . . . 6²(15.2 cm)
Wheelbase . . . . . . . . . . . . . . . . . . . 71²(180.3 cm)
Ground clearance
Pothole protector lowered . . . . . . . 0.75²(1.9 cm)
Pothole protector raised. . . . . . . . . 3.25²(8.3 cm)
Tires
Solid rubber, non-marking. . . . . . . . . . . . 16²x4²
. . . . . . . . . . . . . . . . . . . . . (40.6 cm x 10.2 cm)
Electrical system. . . . . . . . . . . . . . . . . . . . 24 V DC
Hydraulic system
Maximum pressure. . . . . . 2,750 psi (18,961 kPa)
Hydraulic fluid recommended
Above 10° F (-13° C) . . . . . . . . Mobil DTE-13M
Below 10° F (-13° C) . . . . . . . . Mobil DTE-11M
Reservoir capacity
Total . . . . . . . . . . . . . . . . . 6.5 gal USA (24.6 L)
To full mark . . . . . . . . . . . . . 6 gal USA (22.7 L)
Ambient air temperature operating range
Fahrenheit . . . . . . . . . . . . . . . . . . . 0° F to 110° F
Celsius . . . . . . . . . . . . . . . . . . . . -18° C to 43° C
Drive system . . . . . . . . . . . . . . . . . . . 2 wheel drive
Floor loading pressure
Local concentrated pressure . . . . . . . . . . 186 psi
Overall uniform pressure . . . . . . . . . . . . . 213 psf
page 2 - 2 SL 20 – 300206
Chapter 2. Specifications
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Chapter 3. Safety
Knowledge of the information in this manual, and
proper training, provide a basis for safely
operating the aerial platform. Know the location of
all controls and how they operate to act quickly
and responsibly in an emergency.
Safety devices reduce the likelihood of an
accident. Never disable, modify, or ignore any
safety device. Safety alerts in this manual
indicate situations where accidents may occur.
If any malfunction, hazard or potentially unsafe
condition relating to capacity, intended use, or
safe operation is suspected, stop aerial platform
operation and seek assistance.
The operator bears ultimate responsibility for
following all manufacturer’s instructions and
warnings, regulations and safety rules of their
employer and/or any state or federal law.
■Electrocution Hazards
The aerial platform is made of metal components
and is not insulated. Regard all conductors as
energized.Do not operate outside during a
thunderstorm.
❑Minimum Safe Approach Distance
Minimum safe approach distances to energized
power lines and their associated parts must be
observed while operating the aerial platform.
The aerial platform is not electrically
insulated. Death or serious injury can result
from contact with, or inadequate clearance
from, an energized conductor. Do not go
closer than the minimum safe approach
distance as defined by ANSI.
ANSI publications define minimum distances that
must be observed when working near bus bars
and energized power lines.Table 1 and Figure 3
are reprinted courtesy of Scaffold Industry
Association, ANSI/SIA A92.6, page 26.
Voltage range
(phase to phase) Minimum safe approach distance
(Feet) (Meters)
0 to 300V Avoid contact
Over 300V to 50kV 10 3.05
Over 50kV to 200kV 15 4.60
Over 200kV to 350kV 20 6.10
Over 350kV to 500kV 25 7.62
Over 500kV to 750kV 35 10.67
Over 750kV to 1000kV 45 13.72
Table 1—Minimum Safe Approach Distance
SL 20 – 300206 page 3 - 1
Denotes
prohibited
zone
Figure 3—Minimum Safe Approach Distance
DANGER
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■Prestart Inspection
Perform a prestart inspection before each shift as
described in Chapter 8. Do not use the aerial
platform on the job unless you are trained and
authorized to do so.
■Work Place Inspection and Practices
Do not use the aerial platform as a ground
connection when welding.The welding ground
clamp must be attached to the same structure
that is being welded.Electrical current flow can
be very intense, causing serious internal damage
to some components.
Inspect the area before and during aerial platform
use.The following are some potential hazards
that may be in the work place.
●Debris
●Slopes
●Drop-offs or holes
●Bumps and floor obstructions
●Overhead obstructions
●Unauthorized persons
●High voltage conductors
●Wind and weather conditions
●Inadequate surface and support to withstand
load forces applied by the aerial platform in
all operating configurations
Before using the aerial platform in any hazardous
(classified) location, make certain it is approved
and of the type required by ANSI/NFPA 505 for
use in that particular location.
Know and understand the job site traffic-flow
patterns and obey the flagmen, road signs, and
signals.
While operating the aerial platform, a good safety
practice is to have qualified personnel in the
immediate area to:
●Help in case of an emergency
●Operate emergency controls as required
●Watch for loss of control by platform operator
●Warn the operator of any obstructions or
hazards that may not be obvious to them
●Watch for soft terrain, sloping surfaces,
drop-offs, etc.where stability could be
jeopardized
●Watch for bystanders and never allow anyone
to be under, or to reach through, the scissors
structure while operating the aerial platform
Pinch points may exist between moving
components. Death or serious injury can
result from becoming trapped between
components, buildings, structures, or other
obstacles. Make sure there is sufficient
clearance around the machine before moving
the chassis or platform. Allow sufficient room
and time to stop movement to avoid contact
with structures or other hazards.
Always look in the direction of movement.Drive
with care and at speeds compatible with the work
place conditions.Use caution when driving over
rough ground, on slopes, and when turning.Do
not engage in any form of horseplay or permit
riders any place other than in the platform.
Secure all accessories, containers, tools, and
other materials in the platform to prevent them
from accidentally falling or being kicked off the
platform.Remove all objects that do not belong in
or on the aerial platform.
Never steady the platform by positioning it
against another platform.Do not use boards, or
other temporary means to support or level the
aerial platform.
Do not operate the aerial platform if it is damaged
or not functioning properly. Qualified maintenance
personnel must correct the problem before
putting the aerial platform back into service.
■Operation
Use three points of support when entering or
exiting the platform. For example, use two hands
and one foot when climbing into the platform.
Make sure the area below the platform is free of
personnel before lowering.
Keep both feet positioned firmly on the platform
floor.Operate the controls slowly and deliberately
to avoid jerky and erratic operation.Always stop
the controls in neutral before going in the
opposite direction.
Do not dismount while the aerial platform is in
motion or jump off the platform.
Properly stow the aerial platform and secure it
against unauthorized operation at the end of
each work day, before transporting, or if it is left
unattended.
page 3 - 2 SL 20 – 300206
Chapter 3. Safety
DANGER
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■Tip-Over and Falling Hazards
Operate the aerial platform only on a firm, flat,
level surface capable of withstanding all load
forces imposed by the aerial platform in all
operating conditions. Raise the platform only
when the aerial platform is on level ground.
Do not operate the machine within 4¢(1.2 m) of
any drop-off or hole.
It is best not to transfer from the platform to
another structure or vice versa, unless that is the
safest way to do the job. Judge each situation
separately taking the work environment into
account. If it is necessary to transfer from the
platform to another structure use the platform
entrance. Do not climb over the guardrails.
Do not operate the aerial platform in windy or
gusty conditions.Do not add anything to the
aerial platform that will increase the wind loading
such as billboards, banners, flags, etc.
Never operate the aerial platform without all parts
of the guardrail system in place and the safety
chain or gate closed.
Do not exceed the platform capacity as indicated
on the platform rating placard on the platform.
Carry all loads from inside the platform.
Do not operate the aerial platform from trucks,
trailers, railway cars, floating vessels, scaffolds,
or similar equipment unless the application is
approved in writing by Snorkel.
Do not use the aerial platform as a crane, hoist,
jack, or for any purpose other than to position
personnel, tools, and materials.
Do not climb on the guardrails or use ladders,
planks, or other devices to extend or increase the
work position from the platform.
Take care to prevent rope, electrical cords, and
hoses, etc., from becoming caught in or on the
aerial platform. If the platform or scissors
structure becomes caught on an adjacent
structure or other obstacle and is prevented from
normal motion, reverse the control to free the
platform.If control reversal does not free the
platform, evacuate the platform before attempting
to free it.
■Electrical System
Charge batteries in a well-ventilated area free of
flame, sparks, or other hazards that might cause
fire or explosion.
Batteries give off hydrogen and oxygen that
can combine explosively. Death or serious
injury can result from a chemical explosion.
Do not smoke or permit open flames or
sparks when checking the batteries.
Battery acid can damage the skin and eyes.
Serious infection or reaction can result if
medical treatment is not given immediately.
Wear face and eye protection when working
near the batteries.
Batteries contain sulfuric acid that can damage
your eyes or skin on contact. Wear a face shield,
rubber gloves, and protective clothing when
working around batteries. If acid contacts your
eyes, flush immediately with clear water and get
medical attention. If acid contacts your skin, wash
off immediately with clear water.
■Hydraulic System
The hydraulic system contains hoses with
hydraulic fluid under pressure.
Hydraulic fluid escaping under pressure can
have enough force to inject fluid into the
flesh. Serious infection or reaction can result
if medical treatment is not given immediately.
In case of injury by escaping hydraulic fluid,
seek medical attention at once.
Do not place your hand or any part of your body
in front of escaping hydraulic fluid. Use a piece of
cardboard or wood to search for hydraulic leaks.
■Placards and Decals
The aerial platform is equipped with placards and
decals that provide instruction for operation and
accident prevention.Do not operate the aerial
platform if any placards or decals are missing or
not legible. The location, part numbers and
descriptions of all placards and decals are
illustrated in Chapter 8 under Placards and
Decals.
The placards and decals may be cleaned with
soap and water, and a soft cloth if the words or
pictures cannot be seen. Do not use solvents.
The safety related placards and decals are
illustrated on the following pages.
SL 20 – 300206 page 3 - 3
Chapter 3. Safety
DANGER
DANGER
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page 3 - 4 SL 20 – 300206
Chapter 3. Safety
Front
Right Side
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SL 20 – 300206 page 3 - 5
Chapter 3. Safety
(Both Sides)
Left Side
Top of Control Panel
in HydraulicTray
(EE Machines Only)
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page 3 - 6 SL 20 – 300206
Chapter 3. Safety
2nd Inner
ArmTop
Top of Chassis
Rear of Chassis
(Brake Cover Removed)
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Chapter 4. Safety Devices
This aerial platform is manufactured with safety
devices, placards, and decals to reduce the
likelihood of an accident.For the safety of all
personnel, do not disable, modify, or ignore any
safety device. Safety devices are included in the
daily prestart inspection.
The potential for an accident increases when
safety devices do not function properly. Death
or serious injury can result from such
accidents. Do not alter, disable, or override
any safety device.
If any safety devices are defective, remove the
aerial platform from service until qualified
maintenance personnel can make repairs.
■Emergency Stop Controls
There is an emergency stop control at the lower
and upper control station.
At the lower controls, the emergency stop is a
two-position toggle switch (refer to Figure 4.1)
with a red safety guard. Push the red safety
guard down over the toggle switch to disconnect
power to all control circuits. Lift the guard and
push the toggle switch up to restore power.
Figure 4.1—Lower Control Station
NOTE
The lower controls override the upper controls. If
the upper control emergency stop button is
engaged the lower controls can still be used to
operate the aerial platform.
At the upper controls, the emergency stop is a
two-position push button (refer to Figure 4.2).
Figure 4.2—Upper Control Station
Push the emergency stop button in to disengage
power to all control circuits. Pull the button out to
restore power.
■Drive Motion Alarm
When the joystick is positioned to move the aerial
platform forward or in reverse, the drive motion
alarm emits a loud beeping sound.This alarm
warns personnel in the work area to stand clear.
■Lowering Alarm
When the platform is being lowered, an alarm
sounds to warn personnel in the work area to
stand clear.
Pinch points exist on the scissors structure.
Death or serious injury can result if the
scissors structure lowers onto personnel
within the scissors arms or under the raised
platform. Make sure all personnel stand clear
while raising and lowering the platform.
Be careful when lowering the platform. Keep
hands and fingers away from the scissors
structure components.
SL 20 – 300206 page 4 - 1
DANGER
DANGER
Battery
Disconnect
Switch
Circuit Breaker
Reset Button Control Selector
Switch
Platform
Raise/Lower
Switch Emergency
Stop Switch
Low Voltage
Warning Light
Emergency
Stop Button
Horn
Button
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■Pothole Protector Skids
The pothole protector skids automatically lower
when the platform is elevated approximately 12².
Ground clearance is reduced from 3#to about $
when the skids lock into position (refer to Figure
4.3).
Figure 4.3—Pothole Protector Skids
The aerial platform can tip over if it becomes
unstable. Death or serious injury can result
from a tip-over accident. Do not drive or
position the aerial platform for elevated use
within four feet of any drop-off, hole, or other
tip-over hazard.
This protection system limits the tilt angle if a
wheel is driven into a drop-off or hole. This
greatly reduces the likelihood of the aerial
platform tipping over.
The pothole protection system is for added
protection and does not justify operating near
drop-offs or holes.
■Drive/Lift Pothole Protector Interlock
The aerial platform drive and lift functions are
interlocked through a limit switch that senses
whether or not the pothole protection linkage is
locked into position. The drive/lift pothole interlock
operates when the platform is elevated
approximately six feet.
If an obstruction under the skids, or some other
impairment prevents the skids from locking into
position, the drive and lift functions will not
operate and an alarm will sound.
Lower the platform and remove the obstruction
when the drive/lift pothole protector interlock
alarm sounds.
■Drive/Lift Level Sensor Interlock
The aerial platform drive and lift functions are
interlocked through a level sensor system. The
drive/lift level sensor interlock operates when the
platform is elevated approximately six feet.
If the aerial platform chassis is tilted more than
two degrees side-to-side or four degrees
front-to-rear, the drive and lift functions will not
operate and an alarm will sound.
Lower the platform and drive to a level surface
when the drive/lift level sensor alarm sounds.
The drive/lift level sensor system is for added
protection and does not justify operating on
anything other than firm, flat, level surfaces.
■Guardrails
The guardrail system includes a top rail, mid rail,
and toeboards around the sides of the platform
(refer to Figure 4.4).
Figure 4.4—Guardrails
A safety chain or an optional swinging gate
allows for access to the platform.The swinging
gate closes automatically after entering or exiting
the platform.The chain or gate is part of the
guardrail system and must be securely fastened
after entering the platform.
page 4 - 2 SL 20 – 300206
Chapter 4. Safety Devices
DANGER
Pothole Protector Skid
Top Rail
Mid Rail
Toeboard
Swinging
Gate
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■Emergency Lowering Handle
The emergency lowering handle may be used to
manually lower the platform if there is a
malfunction in the hydraulic or electrical system.
The handle (refer to Figure 4.5) is mounted at the
front of the aerial platform.
Figure 4.5—Emergency Lowering Handle
The emergency lowering handle may be used to
lower the scissors arms onto the safety prop
before inspecting the machine.
■Safety Prop
The safety prop (refer to Figure 4.6) is used to
support the scissors structure when access to the
scissors arm components or the chassis is
required. Always use the safety prop when the
platform is raised during inspection and
maintenance.
Figure 4.6—Safety Prop
Pinch points exist on the scissors structure.
Death or serious injury can result if the
scissors structure drops onto personnel
working within the scissors arms or under the
raised platform. Properly position the safety
prop before reaching through the scissors
structure.
When inspecting or servicing the aerial platform
with the platform raised, use the following
procedure to properly position the safety prop.
1. Remove all tools and material from the
platform.
2. Using the lower controls, raise the platform
until the open height between the arm center
pins is approximately 24²(refer to Figure 4.6).
3. Swing the safety prop upward from the
storage position to the support position.
4. Remove hands and arms from the scissors
structure area.
5. Lower the platform until the scissors are
supported by the safety prop.
Use the following procedure to stow the safety
prop.
1. Using the lower controls, raise the platform
until the open height between the arm center
pins is approximately 24².
2. Swing the safety prop down to the stowed
position.
SL 20 – 300206 page 4 - 3
Chapter 4. Safety Devices
DANGER
Safety Prop
24"
Emergency
Lowering Handle
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■Flashing Light
An optional flashing light may be located at the
front of the aerial platform (refer to Figure 4.7).
The flashing light warns personnel that the aerial
platform is in the area.
Figure 4.7—Flashing Light
The light flashes at about one flash per second
when the machine is set up for operation from the
upper controls.
■Lanyard Anchors
Two optional lanyard anchors for fall restraint
anchorage may be provided, one at the front of
the platform extension (refer to Figure 4.8) and
one at the side of the platform.
Figure 4.8—Lanyard Anchors
NOTE
The lanyard anchors are not for lifting or tying the
machine down.
If local work rules require the use of a fall
restraint device, properly connect it to a lanyard
anchor before raising the platform.Do not use the
aerial platform for personal fall arrest anchorage.
■Horn
The optional horn (refer to Figure 4.2) may be
used to warn personnel on the ground. The horn
is operational when the machine is set up for
operation from the upper controls.
■Electrical Power Outlet
The optional electrical power outlet (refer to
Figure 4.9) at the platform contains a ground fault
circuit interrupter (GFCI) to help prevent
accidental conductor grounding.
Figure 4.9—Electrical Power Outlet
page 4 - 4 SL 20 – 300206
Chapter 4. Safety Devices
Flashing Light
Lanyard Anchor
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Chapter 5. Gauges
The aerial platform is equipped with an ammeter,
an hour meter and may have an optional battery
condition indicator.
■Hour Meter
The hour meter is located at the lower controls
(refer to Figure 5.1). It measures the accumulated
aerial platform operating time.
Figure 5.1—Lower Controls
■Ammeter
The ammeter is located on the battery charger
(refer to Figure 5.2). When the batteries are
charging, the ammeter displays the level of
current flow to the batteries.
Figure 5.2—Battery Charger
■Battery Condition Indicator
The optional battery condition indicator (refer to
Figure 5.3) is located on the upper control panel.
It displays the level of available battery power to
operate the aerial platform. The number one on
the scale indicates full power and zero indicates
no power.
Figure 5.3—Battery Condition Indicator
SL 20 – 300206 page 5 - 1
Hour Meter
Ammeter
Battery Condition
Indicator
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Chapter 6. Batteries
The battery tray contains 4, 220 or 240 amp, 6
volt batteries. The batteries supply 24 volt DC
electrical power to operate the aerial platform
electrical and electrohydraulic components.
Proper machine operation depends on well
maintained and charged batteries.
■General Maintenance
Always keep the batteries clean, free of dirt and
corrosion. A film on top of the battery can
accelerate discharge.
Cold reduces battery capacity and retards
charging. Heat increases water usage and can
result in overcharging. Very high temperatures
can cause thermal run away which may lead to
an explosion or fire. Consult a battery charger
specialist if extreme temperature use is
unavoidable.
Battery acid can damage the skin and eyes.
Serious infection or reaction can result if
medical treatment is not given immediately.
Wear face and eye protection when working
near the batteries.
Use distilled water to refill the batteries.Avoid
water containing metallic solids such as iron.
■Charging
Fully recharge the batteries, immediately after
use.One charging cycle per day is preferred.
Fully charged batteries perform best. The deeper
the discharge, the fewer number of cycles a
battery will deliver.Deep discharges deteriorate
the battery quicker than light shallow cycles.
An overly discharged battery may need to be
cycled a few times before it can fully recover.If a
battery begins to heat before becoming fully
charged, it may be necessary to recharge and
discharge the battery a few times.
The aerial platform is equipped with an automatic
battery charger that will completely recharge the
batteries and turn off after the charge cycle is
completed.
Batteries give off hydrogen and oxygen that
can combine explosively. Death or serious
injury can result from a chemical explosion.
Charge the batteries only in a well ventilated
area away from sparks or flame.
The batteries can be overcharged and/or
damaged if the charger fails to shut off
automatically. Do not leave the battery
charger on for more than two days.
It may take from 1½ to 16 hours to recharge the
batteries depending on the amount of discharge.
If the charging cycle exceeds 16 hours without
the batteries being fully recharged, shut off the
charger and have the batteries checked.
Use the following procedure to charge the
batteries.
1. Turn the battery disconnect switch off (refer
to Figure 6.1).
Figure 6.1—Lower Controls
2. Check the battery water level.Add water to
individual cells only if the plates are exposed.
3. Plug the charger into a properly grounded
outlet using a 3 conductor, 14 gauge or
larger extension cord. After a short delay the
charger will turn on.The ammeter (refer to
Figure 6.2) will indicate near 20 amps initially
then taper off to 5 to 10 amps as the
batteries charge.
Figure 6.2—Battery Charger
SL 20 – 300206 page 6 - 1
Battery
Disconnect
Switch
DANGER
CAUTION
DANGER
Ammeter
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