Snorkel SL20 Operator's Manual

PDF

Document

P/N 300206

October, 1998

Operator’s

Manual battery powered

Electrical Hazard

DANGER

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

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

SL 20 – 300206

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

Table of Contents

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

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.

DANGER

Indicates a situation which if not avoided can result in death or serious injury.

CAUTION

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.

Chapter 1. Introduction

■

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.

DANGER

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

Chapter 1. Introduction

■

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 2. Specifications

■

Component Identification

90 in

228.6 cm

Platform Extension

Upper Controls

Guardrails

Platform

Scissors

Structure

Chassis

Rear

Pothole

Protector Skid

91 in

231.1 cm

71 in

180.3 cm

Hydraulic Tray (Right Side)

Battery Tray (Left Side)

Toeboards

78.5 in

199.4 cm

36 in

91.4 cm

Front (Steer)

3.25 in - 8.3 cm Platform Lowered

0.75 in - 1.9 cm Platform Raised

Lower Controls

30 in

76.2 cm

Operator’s

Manual Holder

33 in

83.8 cm

SL 20 – 300206 page 2 - 1

Chapter 2. Specifications

■

General Specifications

Maximum platform height . . . . . . . . . . . 20 (6.1 m)

Working height . . . . . . . . . . . . . . . . . . . 26 (7.9 m)

Platform size

Main . . . . . . . . . . 30 x 90 (76.2 cm x 228.6 cm)

Extension . . . . . . . . . 24 x 36 (61 cm x 91.4 cm)

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 . . . . . . . . . . . . . . . . . . . . . . . 30 (76.2 cm)

Outside . . . . . . . . . . . . . . . . . . . 101 (256.5 cm)

Overall length . . . . . . . . . . . . . . . . . 91 (231.1 cm)

Overall width . . . . . . . . . . . . . . . . . . . 33 (83.8 cm)

Overall height, stowed . . . . . . . . . 78.5

(199.4 cm)

Guardrail height

Platform . . . . . . . . . . . . . . . . . . . . 41 (104.1 cm)

Platform extension . . . . . . . . . . . . 40 (101.6 cm)

Toeboard height . . . . . . . . . . . . . . . . . 6 (15.2 cm)

Wheelbase . . . . . . . . . . . . . . . . . . . 71 (180.3 cm)

Ground clearance

Pothole protector lowered . . . . . . . 0.75

(1.9 cm)

Pothole protector raised . . . . . . . . . 3.25

(8.3 cm)

Tires

Solid rubber, non-marking . . . . . . . . . . . . 16 x 4

. . . . . . . . . . . . . . . . . . . . .

(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 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.

DANGER

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)

0 to 300V

Over 300V to 50kV

Over 50kV to 200kV

Over 200kV to 350kV

Over 350kV to 500kV

Over 500kV to 750kV

Over 750kV to 1000kV

Minimum safe approach distance

(Feet) (Meters)

Avoid contact

3.05

4.60

6.10

7.62

10.67

13.72

Table 1—Minimum Safe Approach Distance

SL 20 – 300206

Figure 3—Minimum Safe Approach Distance

Denotes prohibited zone page 3 - 1

Chapter 3. Safety

■

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 page 3 - 2

DANGER

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.

SL 20 – 300206

Chapter 3. Safety

■

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.

DANGER

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.

DANGER

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

Right Side page 3 - 4

Front

SL 20 – 300206

Chapter 3. Safety

Top of Control Panel in Hydraulic Tray

(Both Sides)

SL 20 – 300206

(EE Machines Only)

Left Side page 3 - 5

Chapter 3. Safety

Top of Chassis

2nd Inner

Arm Top page 3 - 6

Rear of Chassis

(Brake Cover Removed)

SL 20 – 300206

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.

DANGER

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.

Circuit Breaker

Reset Button

Control Selector

Switch

Battery

Disconnect

Switch

Horn

Button

Emergency

Stop Button

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.

DANGER

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.

Platform

Raise/Lower

Switch

Low Voltage

Warning Light

Emergency

Stop Switch

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).

SL 20 – 300206 page 4 - 1

Chapter 4. Safety Devices

■

Pothole Protector Skids

The pothole protector skids automatically lower when the platform is elevated approximately 12 .

Ground clearance is reduced from 3

# to about

$ when the skids lock into position (refer to Figure

4.3).

■

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).

Pothole Protector Skid

Figure 4.3—Pothole Protector Skids

DANGER

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.

Swinging

Gate

Top Rail

Mid Rail

Toeboard

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

■

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.

Emergency

Lowering Handle

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.

DANGER

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 24 (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 24 .

2. Swing the safety prop down to the stowed position.

Safety Prop

24"

Figure 4.6—Safety Prop

SL 20 – 300206 page 4 - 3

Chapter 4. Safety Devices

■

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.

Flashing Light

■

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 4.7—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 4.9—Electrical Power Outlet

Lanyard Anchor

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.

page 4 - 4 SL 20 – 300206

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.

■

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.

Battery Condition

Indicator

Hour Meter

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 5.3—Battery Condition Indicator

Ammeter

Figure 5.2—Battery Charger

SL 20 – 300206 page 5 - 1

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.

DANGER

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.

DANGER

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.

CAUTION

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.

Ammeter

Battery

Disconnect

Switch

SL 20 – 300206

Figure 6.2—Battery Charger page 6 - 1

Chapter 6. Batteries

NOTE

If the batteries are fully charged when the charger is plugged in, the ammeter will initially read 15 to 20 amps then quickly read zero.

4. Leave the charger plugged in until it shuts itself off.

5. Unplug the extension cord after the battery charger turns itself off. Allow the batteries to cool off after charging.

6. Check the battery water level and refill cells as necessary.

page 6 - 2 SL 20 – 300206

Aerial platform functions may be operated with controls at the lower control station or the upper control station.

■

Lower Controls

The lower controls (refer to Figure 7.1) are located in the hydraulic tray on the right side of the chassis. The following are located at the lower control station.

● Battery disconnect switch

● Emergency stop switch

● Control selector switch

●

Platform raise/lower switch

●

Circuit breaker reset button

●

Low voltage warning light

Circuit Breaker

Reset Button

Control Selector

Switch

Battery

Disconnect

Switch

Platform

Raise/Lower

Switch

Low Voltage

Warning Light

Emergency

Stop Switch

Figure 7.1—Lower Controls

❑ Battery Disconnect Switch

The battery disconnect removes electrical power from all electrically controlled functions when in the off position. Place the switch in the on position to operate any electrically controlled function.

CAUTION

Only authorized personnel should operate the aerial platform. Unqualified personnel may cause injury to coworkers or property damage. Lock the battery disconnect switch in the off position before leaving the aerial platform unattended.

Lock the battery disconnect switch in the off position to prevent unauthorized use of the aerial platform.

Chapter 7. Controls

❑ Emergency Stop Switch

The emergency stop is a two-position toggle switch 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.

❑ Control Selector Switch

Place the control selector switch in the down position to operate aerial platform functions from the lower controls. The upper controls will not operate while the control selector is in the lower position.

Place the selector switch in the up position to operate the aerial platform functions from the upper controls.

❑ Platform Raise/Lower Switch

Pull up on the platform switch to raise the platform. Release the switch when the desired height is reached.

Push down on the switch to lower the platform.

The lowering alarm will sound as the platform lowers.

❑ Circuit Breaker Reset Button

A circuit breaker is located in the electrical power line of the lower control panel. The circuit breaker protects the wiring and components from electrical overload in case of a short circuit or other fault.

Push the button to reset the circuit breaker.

CAUTION

A tripped circuit breaker indicates a malfunction in the electrical system.

Component damage can result if the cause of the malfunction is not corrected. Do not operate the aerial platform if the circuit breaker trips repeatedly.

❑ Low Voltage Warning Light

When the voltage of the battery pack falls to a preset level too low for proper machine operation the following happens.

● The low voltage warning light turns on

● An alarm sounds

● The platform will not raise

SL 20 – 300206 page 7 - 1

Chapter 7. Controls

Lower the platform to the stowed position when the warning light is on and the alarm is activated.

Drive to a battery recharging area and fully recharge the battery pack before returning the aerial platform to service.

■

Upper Controls

The upper controls (refer to Figure 7.2) are located on the control box at the platform. The following are located at the upper control station.

● Emergency stop button

●

Drive/lift selector switch

●

Joystick to control platform lift, drive and steer

●

Low voltage warning light

The optional horn button and battery condition indicator gauge may also be located at the upper control station.

Low Voltage

Warning Light

Horn

Button

Interlock

Switch

Battery

Condition

Indicator

Drive/Lift

Selector

Switch

Joystick

Steer

Switch

Emergency Stop Button

Figure 7.2—Upper Controls

❑ Emergency Stop Button

The emergency stop is a two-position red push button on the front of the upper control box. Push the button in to disconnect power to all control circuits at the upper controls. Pull the button out to restore power.

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.

Push the emergency stop button in when the upper controls are not in use to help protect against unintentional platform operation.

❑ Drive/Lift Selector Switch

Place the drive/lift selector switch in the drive position to drive the aerial platform using the joystick. The platform will not raise or lower while driving.

Place the drive/lift selector switch in the lift position to raise and lower the platform using the joystick.

❑ Joystick

The joystick (refer to Figure 7.2) allows for operating more than one function at a time. Use the joystick to operate the following functions.

● Aerial platform steering

● Aerial platform drive and speed

●

Platform raise/lower and speed

Movement of the joystick in a given direction produces a corresponding movement of the aerial platform. The steering and drive functions may be operated separately or simultaneously.

◆ Interlock

The joystick has an interlock switch in the handle.

Engage the interlock by grasping the joystick and pulling the switch toward the handle. Engage the interlock to activate the steering, drive, or lift functions.

◆ Steer Switch

The steer switch is a momentary contact, rocker switch on top of the joystick. This switch controls the two front wheels to steer the aerial platform.

To steer to the right, engage the interlock on the joystick and hold down the right side of the steer switch. To steer to the left, engage the interlock on the joystick and hold down the left side of the steer switch.

NOTE

The steering wheels are not self-centering. Set the steering wheels straight ahead after completing a turn.

page 7 - 2 SL 20 – 300206

❑ Low Voltage Warning Light

When the voltage of the battery pack falls to a preset level too low for proper machine operation the following happens.

● The low voltage warning light turns on

●

An alarm sounds

●

The platform will not raise

Lower the platform to the stowed position when the warning light is on and the alarm is activated.

Drive to a battery recharging area and fully recharge the battery pack before returning the aerial platform to service.

❑ Horn Button

The optional horn button is on the left side of the upper control box. Press the push button switch to sound the horn.

❑ Battery Condition Indicator

The optional battery condition indicator gauge is on the top of the upper control box. It indicates the level of available battery power to operate the aerial platform.

Chapter 7. Controls

SL 20 – 300206 page 7 - 3

Chapter 8. Prestart Inspection

Potential service and safety problems may be detected by inspecting the aerial platform every day. This chapter includes a prestart inspection table (refer to Figure 8.1) and information on properly inspecting each item listed in the table.

Perform a prestart inspection at the beginning of each shift before using the aerial platform on the job. The inspection site must have a smooth and level surface. Use the prestart inspection table to ensure no areas are overlooked.

Item

Operator’s manual

Electrical system

Battery fluid level

Battery terminals

Battery charger

Cables and wiring harness

Hydraulic system

Fluid level

Hoses, tubes, and fittings

Free-wheeling valve

Tires and wheels

Parking brakes

Ground strap

Lower control station

Operating controls

Emergency stop

Lowering alarm

Pothole protector interlock

Level sensor interlock

Emergency lowering

Safety prop

Flashing light

Structures

Weldments

Rollers and slide blocks

Fasteners

Upper control station

Guardrail system

Platform extension

Operating controls

Emergency stop

Lowering alarm

Drive motion alarm

Battery condition indicator

Lanyard anchors

Horn

Electrical power outlet

Placards and decals

DANGER

The potential for an accident increases when operating an aerial platform that is damaged or malfunctioning. Death or serious injury can result from such accidents. Do not operate the aerial platform if it is damaged or malfunctioning.

In manual holder

Inspect for

Proper level

Clean, connections tight

Proper operation

No wear or physical damage

Between Full and Add marks

No leaks

Fully closed

Good condition

Proper cam orientation

In place and securely fastened

Proper operation

Shuts off lower controls

Sounds when platform lowers

Proper operation

No damage or deformation

Proper operation

Welds intact, no damage or deformation

Proper operation, no damage

In place and tight

Welds intact, no damage or deformation

Proper operation

Shuts off upper controls

Sounds when platform lowers

Sounds when aerial platform moves

Proper operation

No damage or deformation

Sounds when activated

Proper operation

In place and readable

Figure 8.1—Prestart Inspection Table

Chapter 8. Prestart Inspection

■

Operator’s Manual

Make certain the manual holder (refer to Figure

8.2) is securely fastened to the platform.

Caps

Figure 8.2—Operator’s Manual Holder

Check to see that the proper Operator’s manual is with the aerial platform. The manual should be complete with all pages intact and in readable condition.

■

Electrical System

Electrical power is supplied from 4, 220 or 240 amp, 6 volt batteries. These batteries supply 24 volt DC electrical power to operate the aerial platform electrical and electrohydraulic components.

DANGER

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.

CAUTION

Even with low voltage electrical systems, severe arcing can occur. Electrical shock or component damage can result from contact with energized conductors. Use caution when working with any electrical device.

The batteries are in the swing-out tray on the left side of the aerial platform.

❑ Battery Fluid Level

Remove the caps from each battery (refer to Figure

8.3). Visually check the battery fluid level. If the level is not within

(6 mm) of the bottom of the filler neck inside each hole, add distilled water.

Terminals

Figure 8.3—Batteries

Replace the caps on the batteries. The caps must be in place and tight during machine operation and battery charging.

❑ Battery Terminals

Check the battery terminals and cable ends (refer to Figure 8.3). They should be clean and free of corrosion and dirt. If necessary, clean the terminals and cable ends with a wire brush or terminal cleaning tool. All cable ends must be securely fastened to the terminals.

❑ Battery Charger

Inspect the battery charger (refer to Figure 8.4) to ensure that it is operating properly.

1. Turn the battery disconnect switch off.

2. Plug the charger into a source of power.

3. Observe the reading on the ammeter. The reading should be 20 amps.

Ammeter

Figure 8.4—Battery Charger page 8 - 2 SL 20 – 300206

Chapter 8. Prestart Inspection

❑ Cables and Wiring Harness

Inspect all cables and wiring for wear and/or physical damage such as loose connections, broken wires, and frayed insulation. Check the wiring in areas where a change in routing direction may cause them to become pinched

(refer to Figure 8.5). Make sure the cables and wires are properly routed to avoid sharp edges, pinching, and scuffing.

Figure 8.5—Cables and Wiring Harness

■

Hydraulic System

Hydraulic power is supplied from a single stage hydraulic pump with a 4.1 horsepower DC electrical motor.

DANGER

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.

The hydraulic reservoir, pump, filter, and control valve is located in the hydraulic tray on the right side of the chassis.

❑ Fluid Level

Check the hydraulic fluid level with the aerial platform on a level surface and the platform stowed. The fluid level must be between the Full and Add marks as viewed on the level indicator

(refer to Figure 8.6).

Figure 8.6—Fluid Level Indicator

CAUTION

Not all hydraulic fluid is suitable to use in the hydraulic system. Some have poor lubricating characteristics and can increase component wear. Only use hydraulic fluid as recommended.

If necessary, remove the filler cap and add fluid of the proper type. Refer to Chapter 2—Specifications for the proper type and grade of hydraulic fluid to use. The need to regularly add fluid indicates a leak that should be corrected.

❑ Hoses, Tubes, and Fittings

Inspect all hydraulic hoses, tubes, and fittings for wear, leakage, or damage (refer to Figure 8.7).

Make sure the hoses are properly routed to avoid sharp edges, kinking, and scuffing. Inspect the tubes for dents or other damage that may restrict fluid flow. Make sure all hoses and tubes are held firmly in their support brackets.

Figure 8.7—Hose, Tubes, and Fittings

Hydraulic fluid leaks are easily visible on the ground. Check under the chassis for fluid that has leaked.

SL 20 – 300206 page 8 - 3

Chapter 8. Prestart Inspection

❑ Free-Wheeling Valve

Unlatch and swing out the hydraulic tray. The free-wheeling valve is located on the hydraulic manifold (refer to Figure 8.8). Check the free-wheeling valve to make sure it is fully closed

(clockwise).

Ground Strap

Brake

Engaged

Free-Wheeling

Valve

Figure 8.8—Free-Wheeling Valve

■

Tires and Wheels

Visually inspect the tires (refer to Figure 8.9).

They should be smooth without any cuts, gouges, or missing rubber that might affect aerial platform stability.

Cam

Figure 8.10—Brake Release Cam

■

Ground Strap

Make certain the ground strap (refer to Figure

8.10) is securely fastened to the chassis. It should be long enough to contact the ground surface to eliminate static electricity from the machine.

■

Lower Control Station

With no personnel in the platform, test the operation of each control from the lower control station (refer to Figure 8.11).

Circuit Breaker

Reset Button

Control Selector

Switch

Battery

Disconnect

Switch

Figure 8.9—Tires and Wheels

Check the wheel lug nuts to see that none are missing or loose.

❑ Parking Brakes

Inspect the brake release cam for rust, dirt, and proper orientation. When the brakes are engaged the release cam should swing freely when pushed with a finger and be oriented as shown in

Figure 8.10.

page 8 - 4

Platform

Raise/Lower

Switch

Low Voltage

Warning Light

Emergency

Stop Switch

Figure 8.11—Lower Controls

❑ Operating Controls

Place the battery disconnect switch in the on position, lift the red emergency stop safety guard up, and push the toggle switch up to turn on the electrical power. Place the control selector in the down position to operate the aerial platform from the lower controls.

Test the operation of the platform raise/lower switch in both directions.

Place the battery disconnect switch in the off position. The platform should not raise or lower with the disconnect in this position.

SL 20 – 300206

Chapter 8. Prestart Inspection

❑ Emergency Stop

Push the red emergency stop safety guard down to turn off the electrical power. The lower control functions should not operate with the emergency stop in this position.

❑ Lowering Alarm

Raise the platform and then lower it to ensure that the alarm sounds to warn personnel in the area that the platform is lowering.

■

Pothole Protector Interlock

Perform this test using the lower controls.

1. Stow the aerial platform on a smooth, flat, level concrete slab.

2. Remove all persons and materials from the platform.

3. With the swing-out trays closed, check the ground clearance under the pothole protector skids (refer to Figure 8.12). Clearance should be at least 3

# on both sides of the aerial platform.

Figure 8.12—Pothole Protector Skids

4. Raise the platform while watching movement of the skids. The skids should lower to less than one inch ground clearance when the platform is raised approximately twelve inches.

5. Fully lower the platform while watching movement of the skids. The skids should raise to their original position when the platform is lowered to approximately twelve inches.

6. Place a 1 " thick board, such as a 2 x 4, under the skid on the right side (refer to Figure

8.13).

Figure 8.13—Pothole Protector Interlock Test

7. The board will prevent the skid from lowering fully. Raise the platform while watching the skid. When the skid contacts the board, the platform should stop raising and an alarm should sound at less than six feet platform floor height. The alarm should then sound when the platform lift switch is activated. The platform should not raise any farther.

8. Lower the platform. Place the board under the skid on the left side.

9. Raise the platform while watching the skid.

When the skid contacts the board, the platform should stop raising and an alarm should sound at less than six feet platform floor height. The alarm should then sound when the platform raise switch is activated.

The platform should not raise any farther.

DANGER

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.

10. If the platform raise function is not disabled, or the alarm does not sound remove the aerial platform from service until the problem is corrected.

SL 20 – 300206 page 8 - 5

Chapter 8. Prestart Inspection

■

Level Sensor Interlock

Perform this test after verifying proper operation of the pothole protector interlock.

1. Position the aerial platform on a smooth, flat, level surface.

2. Remove all persons and materials from the platform.

3. From the lower controls, raise the platform to access the level sensor at the front of the chassis (refer to Figure 8.14).

Emergency

Lowering Handle

Level Sensor

Figure 8.15—Emergency Lowering Handle

While standing clear of the scissors structure, pull the handle outward. The platform will begin to lower as the handle is pulled. Release the handle to stop.

■

Safety Prop

Using the lower controls, raise the platform until the open height between the arm center pins is approximately 24 (refer to Figure 8.16).

Figure 8.14—Level Sensor

4. Pull the level sensor to the side as far as possible while raising the platform. The platform should stop raising and the alarm should sound at approximately 6 (2 m) of platform elevation.

DANGER

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.

5. If platform does not stop raising or the alarm does not sound, remove the machine from service until the problem is corrected.

■

Emergency Lowering

Using the lower controls fully raise the platform.

Locate the emergency lowering handle (refer to

Figure 8.15) at the front of the aerial platform.

24"

Safety Prop

Figure 8.16—Safety Prop

Swing the safety prop upward from the storage position to the support position. Inspect the safety prop for damage and deformation. Check for cracks in the welds that hold the handle and the support channel onto the tube.

page 8 - 6 SL 20 – 300206

■

Flashing Light

If the machine is equipped with the optional flashing light (refer to Figure 8.17), visually check to see that it flashes. The light should flash when the lower controls battery disconnect and emergency stop switches are on.

Chapter 8. Prestart Inspection

❑ Rollers and Slide Blocks

Visually inspect the scissors arm rollers and slide blocks (refer to Figure 8.18). They must be free to move without obstruction.

Slide

Block

Flashing Light

Roller

Figure 8.17—Flashing Light

■

Structures

Visually inspect all mechanical structures including the weldments and related components.

It is important to inspect the fasteners that connect the components.

❑ Weldments

Visually inspect all weldments for abnormal wear, abrasion, or deformation that could cause interference between moving parts.

Inspect the welds on the structural components.

The area to be inspected should be clean and free of dirt and grease. Look for visible cracks in the weld and at the weld to parent material joint.

A bright light may be used to provide adequate visibility of the inspection area.

Pay close attention to welds in areas where changes in cross section take place and near the attachment points of highly loaded components.

Figure 8.18—Rollers and Slide Blocks

Raise the platform from the lower controls to visually inspect the slide blocks underneath the front of the platform (refer to Figure 8.19).

Slide Block

Figure 8.19—Platform Slide Blocks

There is one side block on each side of the platform. The slide blocks must be in good condition and free to move without obstruction.

❑ Fasteners

Visually inspect all fasteners to see that none are missing or loose.

Pay particular attention to all of the bolts, nuts, rollpins, collars, and snap rings that connect the scissors arms. They should all be present, tight, and not damaged in any way.

SL 20 – 300206 page 8 - 7

Chapter 8. Prestart Inspection

■

Upper Control Station

Inspect the platform and upper controls only if all functions operated properly from the lower controls.

❑ Guardrail System

The guardrail system (refer to Figure 8.20) includes the top rail, mid rail, toeboards and a safety chain or optional swinging gate.

Latch

Top Rail

Swinging

Gate

Mid Rail

Toeboard

Figure 8.20—Guardrail System

Inspect all components of the guardrail system.

The rails and toeboards must all be in place and free of any damage or deformation. Visually check the rail and toeboard welds for cracks. All bolts and nuts fastening the guardrails in place must be present and not show any signs of looseness.

Inspect the removable top rail at the platform entrance to be sure it is present and securely fastened to the rail. The removable rail must be free of damage and deformation that may prevent if from functioning properly. Inspect the fastener that secures the rail.

Inspect the safety chain to be sure it is present and securely fastened to the rail. The chain must be free of damage and deformation that may prevent if from functioning properly. Inspect the hook and eye that secures the chain to the rail.

Inspect the swinging gate to see that it swings freely, closes firmly, and is not deformed in any way. Make sure the latch closes and secures the gate when the gate is closed.

❑ Platform Extension

Inspect the extension latch (refer to Figure 8.21) to ensure that it properly secures the extended platform. The latch must also release to extend the platform. Extend the platform while checking for proper operation.

Figure 8.21—Platform Extension Latch

Extend the platform and inspect the weldments for deformation and damage. Visually check the platform welds for cracks.

❑ Operating Controls

With the aerial platform stowed, test the operation of each control from the upper control station (refer to Figure 8.22).

Low Voltage

Warning Light

Horn

Button

Interlock

Switch

Battery

Condition

Indicator

Drive/Lift

Selector

Switch

Joystick

Steer

Switch

Emergency Stop Button

Figure 8.22—Upper Controls

From the lower controls, place the battery disconnect switch in the on position and the control selector in the up position. Lift the red emergency stop safety guard up and push the toggle switch up to turn on the electrical power to the upper controls.

From the upper controls, test the interlock by moving the joystick without engaging the interlock switch. If movement occurs the interlock is not functioning properly. Do not operate the machine until the problem is corrected.

Place the drive/lift selector switch in the drive position and test the operation of the joystick in both directions. The lift functions should not operate with the selector in the drive position.

page 8 - 8 SL 20 – 300206

Chapter 8. Prestart Inspection

Place the drive/lift selector switch in the lift position and test the operation of the joystick in both directions. The drive functions should not operate with the selector in the lift position.

❑ Emergency Stop

Push the red emergency stop button in to turn off the electrical power. The upper control functions should not operate with the emergency stop in this position.

❑ Lowering Alarm

Raise the platform and then lower it to ensure that the alarm sounds to warn personnel in the area that the platform is lowering.

❑ Drive Motion Alarm

Drive in both the forward and reverse directions to ensure that the alarm sounds to warn personnel in the area that the aerial platform is in motion.

❑ Battery Condition Indicator

The optional battery condition indicator (refer to

Figure 8.23) is located on the upper control panel.

Battery Condition

Indicator

Lanyard Anchor

Figure 8.24—Lanyard Anchors

There is one anchor at the front of the platform extension and one at the side of the platform.

❑ Horn

If the machine is equipped with the optional horn, depress the horn button on the left side of the upper control box (refer to Figure 8.22) to ensure that it sounds to warn personnel in the area.

❑ Electrical Power Outlet

If the machine is equipped with the optional electrical power outlet, connect a source of 125 volt AC power to the power plug. The power plug is located at the rear of the chassis near the right tire.

Some machines may have an electrical outlet at the platform, but no power-input connector. In that case, power is supplied by an optional AC generator. An external power source is not required. Plug an electrical tool into the receptacle and try to operate the tool to verify proper operation of the outlet.

The outlet may be equipped with a ground fault circuit interrupter (GFCI). Use the following procedure to test the GFCI.

1. Push the black test button (refer to Figure 8.25).

Figure 8.23—Battery Condition Indicator

With the machine set up to operate from the upper controls, check to see that the battery condition indicator gauge displays a power reading.

❑ Lanyard Anchors

If the machine is equipped with the optional lanyard anchors (refer to Figure 8.24), visually inspect them to make sure they are in place, are not deformed and are securely fastened to the platform.

SL 20 – 300206

Reset

Button

Test

Button

Figure 8.25—Electrical Power Outlet

2. Plug an electrical tool into the outlet and verify the power is off.

● If the power was off, push the reset button to restore power.

● If the power was on, repair or replace the receptacle.

page 8 - 9

Chapter 8. Prestart Inspection

■

Placards and Decals

Inspect all safety and operational placards and decals. Make certain they are in place, in good condition, and are legible.

Replace any missing or illegible placards or decals before operating the aerial platform.

Placard and decal kits are available from Snorkel dealers.

Figure 8.26 provides the item number, Snorkel part number, description, and the quantity of each placard and decal required for standard aerial platform features.

No Part No

Description

300688 Platform ratings

2 562426 Operating manual enclosed

3 416836 Battery charger 115 volt only

4 300740 Danger towing instructions

5 480658 Danger tipover/electrical hazard

6 7030004 Omniquip logo

7 451986 Danger do not alter switch

8 0181562 ANSI standards

9 0070420 Emergency bleed down valve

10 475596 Caution cylinder disassembly

11 302950 Hydraulic oil level

12 583656 Danger - use safety prop

13 300181 SL 20 logo

14 560239 Snorkel logo 28 inch orange/black

15 451726 Check battery before charging

16 0070901 Caution serial number

17 300698 Snorkel logo 10 inch orange/black

18 0072545 Emergency stop

19 0074311 Danger cylinder failure (1 per cyl)

20 451776 Hydraulic fluid level

21 300699 Operators checklist

22 300700 Danger shearing/crushing hazard

23 0073585 Made in USA

24 621486 Forklift

25 302820 Caution no step

26 969249 Warning stripes

27 302781 Platform control box top

28 302782 Ground control box

29 7030002 Lube recommendations

30 300170 Hydraaulic schematic

31 302985 Ground controls schematic

32 300760 Danger tipover hazard

Figure 8.26—Standard Feature

Placards and Decals

Req

Figure 8.27 provides the item number, Snorkel part number, description, and the quantity of each placard and decal required for optional features.

No Part No

Description

467376 EE logo yellow (EE machines)

B 486006 Factory mutual (EE machines)

C 0071269 Horn

D 584196 Danger fire hazard NFPA505

E 584216 Notice use OEM parts

F 0150606 125 volt 15 amp power to platform

G 0152251 EE logo white (EE machines)

Figure 8.27—Optional Feature

Placards and Decals

Req

1 page 8 - 10 SL 20 – 300206

Chapter 8. Prestart Inspection

Right Side

32 24

(Inside Platform)

Front

(Inside Platform)

4 F

24 D

15 (Inside Tray)

Left Side

(Inside Control Panel)

Rear of Base Frame

(Brake Cover Removed)

Top of Second

Inner Arm

12 Top of Base Frame

SL 20 – 300206

Hydraulic Tray

Safety Prop

Hydraulic Oil Reservoir

Upper Control Box page 8 - 11

The aerial platform may be operated from either the lower or upper controls.

DANGER

The aerial platform can tip over if it becomes unstable. Death or serious injury can result from a tip-over accident. Operate the aerial platform on a firm, flat, level surface. Avoid travel speeds and/or rough terrain that could cause sudden changes in platform position.

The operator bears ultimate responsibility for ensuring that the aerial platform is properly set up for the particular conditions encountered.

■

Preparing for Operation

Make certain the batteries are charged and the charger is unplugged before operating the aerial platform. Use the following procedure to prepare the aerial platform for operation.

1. Close and latch the swing-out battery and hydraulic component trays.

2. From the lower controls, place the battery disconnect switch in the on position (refer to

Figure 9.1).

Control Selector

Switch

Battery

Disconnect

Switch

Chapter 9. Operation

3. Lift the emergency stop guard and push the toggle switch up.

4. Place the control selector switch in the lower position.

5. Operate the platform raise/lower switch to make sure the aerial platform is functioning properly.

■

Lower Controls

The lower controls override the upper controls.

This means that the lower controls can always be used to operate the platform regardless of the position of the upper controls emergency stop switch.

The lower controls may be used for initial set up of the aerial platform and raising and lowering the platform while testing or inspection.

The lower controls (refer to Figure 9.1) are located on the right side of the chassis. The following are located at the lower control station.

●

Battery disconnect switch

●

Emergency stop switch

●

Control selector switch

● Platform raise/lower switch

● Circuit breaker reset button

● Low voltage warning light

■

Upper Controls

The upper controls may be used for positioning the aerial platform and raising and lowering the platform while on the job.

The upper controls (refer to Figure 9.2) are located on the right side of the platform. The following are located at the upper control station.

●

Emergency stop button

●

Drive/lift selector switch

●

Low voltage warning light

●

Joystick to control platform lift, drive, and steer

The optional horn button and battery condition indicator gauge may also be located at the upper control station.

Platform

Raise/Lower

Switch

Emergency

Stop Switch

Figure 9.1—Lower Controls

SL 20 – 300206 page 9 - 1

Chapter 9. Operation

Low Voltage

Warning Light

Horn

Button

Interlock

Switch

Battery

Condition

Indicator

Drive/Lift

Selector

Switch

Joystick

Steer

Switch

Emergency Stop Button

Figure 9.2—Upper Controls

Before operating from the upper controls, properly set up the aerial platform as described under Preparing for Operation. Use the following procedure to operate the aerial platform from the upper controls.

1. From the lower controls, place the control selector switch in the upper position. The upper controls will not operate while the control selector is in the lower position.

2. Enter the platform. The top rail at the platform entrance may be swung upward to load the platform if necessary. Secure the chain, or optional swinging gate, and the top rail.

3. Pull the emergency stop button outward.

4. The aerial platform may be positioned and the platform may be raised and lowered from the upper controls.

❑ Driving

DANGER

The aerial platform can tip over if it becomes unstable. Death or serious injury can result from a tip-over accident. Do not drive an elevated aerial platform on soft, uneven, or sloping surfaces. Do not drive a fully stowed machine on grades that exceed 20 percent.

A fully stowed machine may be operated on grades up to 20 percent. A grade of 20 percent is a 24 (61 cm) vertical rise in 10 (3.05 m) horizontal length. Use the following procedure to drive the aerial platform using the upper controls.

1. Place the drive/lift selector switch (refer to

Figure 9.2) in the drive position.

2. Squeeze and hold the interlock switch against the joystick.

page 9 - 2

●

To move forward, slowly push the joystick forward until the desired speed is reached.

The aerial platform may travel at three different speeds depending on how far forward the joystick is moved. The three speed ranges are separated by detents that can be felt as the joystick is moved from neutral.

● To move backward, slowly pull the joystick backward. There is only one reverse speed.

◆ Drive Speeds

The aerial platform can travel at three different drive speeds. Drive speed ranges are interlocked through a limit switch that senses scissors arm position. When the platform is elevated below approximately six feet, the aerial platform may be driven forward or backward at three different speeds. Above six feet of elevation, the two fastest speeds are locked out and only the slowest drive speed will work.

DANGER

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.

Do not use the aerial platform if it drives faster than ½ mile per hour (25 in 30 seconds) when elevated above 6 even if the joystick is in the mid or high speed position.

◆ Drive/Lift Level Sensor Interlock

When the platform is elevated above approximately six feet, lift and drive functions are interlocked through a level sensor system. If the chassis is tilted more than two degrees side-to-side, or four degrees front-to-rear, platform raise and drive functions are disabled and an alarm sounds when those controls are activated.

If the drive/lift level sensor interlock shuts off the platform raise and drive functions, lower the platform and drive to a level surface.

Platform raise and drive functions may also be disabled by the pothole protection interlock.

❑ Steering

The steer control switch is located on the joystick

(refer to Figure 9.2). Use the following procedure to steer the aerial platform using the upper controls.

1. Squeeze and hold the interlock switch against the joystick.

SL 20 – 300206

Chapter 9. Operation

●

To turn to the left, tap lightly on the left side of the steer switch.

●

To turn to the right, tap lightly on the right side of the steer switch.

NOTE

Holding the steer switch down too long may result in a sharp turn. This is especially true when driving and steering at the same time. It may be easier to turn the wheels in small increments using a series of quick taps on the steer switch.

2. Reverse the steer control direction after completing a turn to return to a straight line travel. The steering wheels are not self-centering.

❑ Platform

The platform rated work load is the total weight of the personnel and equipment that may be lifted in the platform. The work loads are stated on the platform rating placard mounted on the toeboard at the front of the platform.

DANGER

The aerial platform can tip over if it becomes unstable. Death or serious injury can result from a tip-over accident. Do not exceed the capacity values indicated on the platform rating placard.

Capacity values indicate the rated lifting capacity and do not indicate aerial platform stability.

Use care when entering and exiting the platform to avoid slipping and/or falling. Securely close the safety chain or optional swinging gate when the platform is occupied.

◆ Raising and Lowering

1. Place the drive/lift selector switch (refer to

Figure 9.2) in the lift position.

2. Squeeze and hold the interlock switch against the joystick.

●

To raise the platform, slowly push the joystick forward until the desired speed is reached. The platform can be raised at three different speeds depending on how far forward the joystick is moved. The three speed ranges are separated by detents that can be felt as the joystick is moved from neutral.

● To lower the platform, slowly pull the joystick backward. There is only one lowering speed.

◆ Extending

The platform can be extended and securely locked into four different positions. Use the following procedure to extend or retract the platform.

1. Stand on the non-extendible part of the platform floor, facing the front of the platform.

2. Squeeze and hold the trigger (refer to Figure

9.3) while pushing or pulling on the retractable rails.

Figure 9.3—Platform Extend Trigger

3. Release the trigger when the platform is at the desired position.

4. Try to move the rails back and forth to make sure they are locked in position.

■

Brakes

Each rear wheel is equipped with a mechanical spring-applied, hydraulically released parking brake. When the drive control is in neutral, a spring-activated pin protrudes through an opening in the brake disc to prevent movement

(refer to Figure 9.4). A flow control valve slows the pin movement to allow the aerial platform to stop before the parking brakes engage.

Cam

Trigger

Brake

Engaged

SL 20 – 300206

Figure 9.4—Mechanical Brake page 9 - 3

Chapter 9. Operation

This system operates automatically to stop and hold the aerial platform when the drive controls are released or power is interrupted. Manually disengage the brakes before towing or winching the aerial platform as described under Towing in

Chapter 11—Emergency Operation.

■

Swing-Out Trays

Batteries and hydraulic components are enclosed in swing-out trays (refer to Figure 9.5) on each side of the chassis.

Latch

Handle

Tray

Figure 9.6—Electrical Power Outlet

The power-input connector for the electrical outlet is located at the rear of the chassis near the right tire (refer to Figure 9.7). Plug a source of power into the power-input connector when electrical power is required at the platform.

Figure 9.5—Swing-Out Tray

The tray on the right side of the chassis contains the electrical panel for the lower controls, the hydraulic directional control valve, the free-wheeling valve, reservoir, pump, and the hydraulic fluid filter. The tray on the left side contains the four batteries and the charger.

DANGER

The aerial platform can tip over if it becomes unstable. Death or serious injury can result from a tip-over accident. Do not open the swing-out trays when the platform is raised more than eight feet.

To open a tray, press down on the latch, pull the pothole protector skid handle toward you, and swing the tray open.

If the platform is raised to approximately six inches and the pothole protection skids are down, the trays will swing out without lowering the skids.

■

Electrical Power Outlet

The optional electrical box has 2, 3-prong, 125 volt AC electrical connectors (refer to Figure 9.6).

Their combined output is limited by a 20 amp circuit breaker.

Power-Input Connector

Figure 9.7—Power-Input Connector

Unplug the source of power before moving the aerial platform.

Some machines may have an electrical outlet at the platform, but no power-input connector. In that case, power is supplied by an optional AC generator. An external power source is not required.

page 9 - 4 SL 20 – 300206

To prevent unauthorized use and damage, properly stow the aerial platform at the end of each work day. It must also be properly stowed while transporting.

■

Stowing

Use the following procedure to properly stow the aerial platform.

1. Retract the platform extension.

2. Fully lower the platform.

3. Close the emergency stop switch cover to activate the emergency stop switch.

4. Turn the battery disconnect switch off.

5. Padlock the battery disconnect switch.

■

Transporting

The aerial platform may be moved on a transport vehicle. Depending on the particular situation, the aerial platform may be lifted with a forklift, winched, driven, or hoisted onto a vehicle such as a truck or trailer. Lifting with a forklift is the preferred method.

DANGER

The aerial platform can tip over if it becomes unstable. Death or serious injury can result from a tip-over accident. Do not drive on ramps that exceed 20 percent grade, or where conditions of the ramp could cause driving to be hazardous.

Use a winch to load and unload the aerial platform on ramps that exceed 20 percent grade.

A 20 percent grade is a 24 (61 cm) vertical rise in 10 (3.05 m) horizontal length. A winch may also be used when poor traction, uneven surfaces, or stepped ramp transitions make driving hazardous.

Drive the aerial platform onto the transport vehicle if a winch is not available and the ramp incline is within the 20 percent grade capability of the aerial platform.

The aerial platform weighs approximately 3,750 pounds. The equipment used to load, unload, and transport the aerial platform must have adequate capacity.

The user assumes all responsibility for making sure the equipment used is capable of supporting the weight of the aerial platform.

❑ Winching

Use the following procedure to winch the aerial platform onto the transport vehicle.

SL 20 – 300206

Chapter 10. Stowing and Transporting

1. Locate the transport vehicle so the aerial platform will not roll forward after it is loaded.

2. Remove any unnecessary tools, materials, or other loose objects from the platform.

3. From the upper controls, center the aerial platform with the loading ramps and transport vehicle bed. Make sure that the steering wheels are straight.

4. Properly stow the aerial platform.

5. Use a $ wrench to rotate each brake release cam 90° (refer to Figure 10.1). Rotate the cam on the right brake cylinder counterclockwise and the one on the left brake cylinder clockwise. This will retract the brake pins from the wheel lugs releasing the brakes. Remove the wrench.

Figure 10.1—Brake Release Cam

6. Unlatch and swing out the hydraulic tray. The free-wheeling valve is located on the hydraulic manifold (refer to Figure 10.2). Turn the free-wheeling valve counterclockwise to a fully opened position.

Free-Wheeling

Valve

Figure 10.2—Free-Wheeling Valve

7. Attach the winch to the tie-down lugs (refer to

Figure 10.3) on the front of the chassis.

page 10 - 1

Chapter 10. Stowing and Transporting

Figure 10.3—Tie-Down Lugs

8. Use the winch to position the aerial platform on the transport vehicle.

9. Close the free-wheeling valve.

10. Manually reset the parking brakes using a wrench or drive the aerial platform to reset them.

❑ Driving

Use the following procedure to drive the aerial platform onto the transport vehicle.

1. Locate the transport vehicle so the aerial platform will not roll forward after it is loaded.

2. Remove any unnecessary tools, materials, or other loose objects from the platform.

3. Fully lower the platform and retract the platform extension.

4. From the upper controls, center the aerial platform with the loading ramps and transport vehicle bed. Make sure that the steering wheels are straight.

5. Place the joystick in speed two for climbing a ramp or speed one for descending a ramp.

6. Drive the aerial platform on or off the transport vehicle in a straight line through the grade transitions with minimal turning.

❑ Hoisting

Use the following procedure to hoist the aerial platform onto the transport vehicle.

1. Inspect the tie-down lugs to make sure they are free of cracks, rust, and are in good condition. There are two lugs on the rear of chassis and two on the front of chassis.

2. Remove all personnel, tools, materials, or other loose objects from the platform.

3. Connect chains or straps to create a four point lift using the tie-down lugs.

page 10 - 2

Tie-Down Lug

4. Use a spreader bar of sufficient length to keep the chains or straps from contacting the upper structure of the aerial platform.

5. Use the hoist to carefully raise and position the aerial platform onto the transport vehicle.

❑ Lifting With a Forklift

Use the following procedure to lift the aerial platform with a forklift.

1. Properly stow the aerial platform.

2. Remove all personnel, tools, materials, or other loose objects from the platform.

3. Insert the forklift forks into the pockets (refer to

Figure 10.4) or at the designated points under the pothole protector skids to lift the machine.

Forklift Pocket

Figure 10.4—Forklift Pockets

4. Do not raise the aerial platform higher than necessary to transport it. Drive the forklift slowly and carefully when transporting the platform.

SL 20 – 300206

❑ Securing for Transport

Use the following procedure to secure the aerial platform on the transport vehicle.

1. Properly stow the aerial platform.

2. Remove all personnel, tools, materials, or other loose objects from the platform.

3. Chock the wheels.

4. Place three inch blocks under the front ends of the pothole protection skids to limit excessive loading on the front drive wheel bearings.

CAUTION

Ratchets, winches, and come-alongs can produce enough force to damage machine components. Do not over tighten the straps or chains when securing the aerial platform to the transport vehicle.

5. Use chains or straps to securely fasten the aerial platform to the transport vehicle using the front and rear tie-down lugs as attachment points. Proper tie-down and hauling is the responsibility of the carrier.

Chapter 10. Stowing and Transporting

SL 20 – 300206 page 10 - 3

If the aerial platform cannot be operated due to a loss of hydraulic power, such as motor or pump failure, the platform lift cylinder and drive wheels may be operated manually. Refer to the

Emergency Lowering or Towing section for the appropriate procedure.

■

Emergency Lowering

Use the following procedure to manually lower the platform.

1. Retract the platform extension, if possible.

2. Locate the emergency lowering handle at the front of the aerial platform (refer to Figure 11.1).

Chapter 11. Emergency Operation

and the one on the left brake cylinder clockwise.

Remove the wrench.

Emergency

Lowering Handle

Figure 11.2—Brake Release Cam

4. Unlatch and swing out the hydraulic tray. The free-wheeling valve is located on the hydraulic manifold (refer to Figure 11.3). Turn the free-wheeling valve counterclockwise to a fully opened position. Close the tray.

Free-Wheeling

Valve

Figure 11.1—Emergency Lowering Handle

3. Make sure there is nothing in the way to obstruct the platform when it lowers.

DANGER

Pinch points exist on the scissors structure.

Death or serious injury can result from becoming trapped within the scissors structure. Make sure all personnel stand clear while lowering the platform with the emergency lowering handle.

4. Pull the handle outward to lower the platform.

5. Release the handle to stop.

■

Towing

The aerial platform may be pushed or pulled after disengaging the brakes. Use the following procedure to manually disengage the brakes.

1. Restrain the aerial platform if it is not on a level surface to prevent movement when the brakes are released.

2. Turn the battery disconnect switch off.

3. Use a $ wrench to rotate each brake release cam 90° (refer to Figure 11.2). Rotate the cam on the right brake cylinder counterclockwise

Figure 11.3—Free-Wheeling Valve

5. Do not exceed two miles per hour when towing.

DANGER

The aerial platform is free to move when the brakes and free-wheeling valve are disabled.

Death or serious injury can result. Close the free-wheeling valve and reset the brakes before operating the aerial platform.

6. Close the free-wheeling valve after moving the aerial platform.

7. Manually reset the parking brakes using a wrench or drive the aerial platform to reset them.

8. Verify that the brakes reset properly.

SL 20 – 300206 page 11 - 1

Chapter 12. Troubleshooting

The chart below lists situations where machine operation may be interrupted. If the problem cannot be corrected with the action listed, stow the machine and remove it from service. Repairs must be made by qualified maintenance personnel.

■

Troubleshooting Chart

Symptom

All Functions stop working.

Possible Cause

Motor or pump failure.

Low fluid level in reservoir.

Corrective Action

Manually stow the machine.

Check fluid level. Add correct type of fluid if necessary.

Press the circuit breaker reset button.

Platform will not raise or lower from lower controls.

Circuit breaker on the lower control panel has tripped.

Electrical system malfunction.

Control selector switch in the upper control position.

Battery disconnect switch turned off.

Emergency stop switch in the off position.

Emergency lowering handle not properly engaged.

Control selector switch in the lower control position.

Low hydraulic system pressure.

Manually stow the machine.

Place switch in the lower control position.

Place switch in the on position.

Raise safety guard and place switch in the on position.

Ensure handle returns to normal operating position.

Place switch in the upper control position.

Upper controls will not work.

Battery disconnect switch turned off.

Emergency stop button pushed inward to the off position.

Drive/lift selector is in the drive position.

Platform will not raise or lower from upper controls.

Platform will not raise and alarm is sounding.

Platform drifts down.

Emergency lowering handle not properly engaged.

Machine is not on a level surface.

Emergency lowering handle not properly disengaged.

Platform will not lower.

Platform will not extend.

Drive functions don’t work.

Hydraulic system malfunction.

Safety prop in place.

Latch not fully releasing.

Drive/lift selector is in the lift position.

Machine is not on a level surface or too steep a grade.

Free-wheeling valve is open.

Place switch in the on position.

Pull the emergency stop button outward to the on position.

Place switch in the lift position.

Ensure handle returns to normal operating position.

Lower the platform and drive to a level surface.

Ensure handle returns to normal operating position.

Manually stow the machine.

Stow the safety prop.

Fully engage the platform extend trigger to release the latch before extending the platform.

Place the switch in the drive position.

Lower the platform and drive to a level surface.

Fully close the free-wheeling valve.

Load capacity exceeded.

Remove load from platform. Refer to platform capacity placard for maximum capacity.

Manually stow the machine.

SL 20 – 300206 page 12 - 1

Chapter 12. Troubleshooting

Symptom

Only slow drive speed works.

Machine will not steer.

Possible Cause

Platform elevated above six feet.

Joystick interlock switch not engaged.

Low voltage warning light on.

Electrical outlet does not work.

Low battery voltage.

Power supply not plugged in.

Wheels won’t turn when winching or pushing.

GFCI is tripped.

Brake pins engaged.

Free-wheeling valve closed.

Electrical system malfunction.

Circuit breaker will not reset.

Brakes don’t work.

Brake pins not engaged.

Swing-out tray will not open or close.

Ammeter does not indicate a reading when charging the batteries.

Severe hydraulic leak.

Pothole protector skid in the way.

No source of power.

Circuit breaker on the lower control panel has tripped.

Charger power fuse is blown.

Failure or hose, tube, fitting, seal, etc.

Corrective Action

Lower platform to drive machine at mid and high speed.

Engage the interlock switch before operating the steer switch.

Lower the platform, drive to recharging area and charge the batteries.

Plug in power supply at outlet at rear of chassis.

Push reset button on outlet.

Rotate brake release cams to disengage brakes.

Fully open free-wheeling valve.

Manually stow the machine.

Manually release brake cams with a wrench or drive the machine to reset the brakes.

Pull handle toward you to lower the skid.

Make sure power source is plugged in and turned on.

Press the circuit breaker reset button.

Manually stow the machine.

page 12 - 2 SL 20 – 300206

Appendix A. Glossary

aerial platform—a mobile device that has an adjustable position platform, supported from ground level by a structure.

authorized personnel—personnel approved as assigned to perform specific duties at a specific location.

base—the relevant contact points of the aerial platform that form the stability support (e.g.

wheels, casters, outriggers, stabilizers).

battery tray—a swing-out compartment that holds the batteries and battery charger.

chassis—the integral part of the aerial platform that provides mobility and support for the scissors structure.

fall restraint—a system that is used while working on a boom lift within the boundaries of platform guardrails to provide restraint from being projected upward from the platform. This system includes a harness or belt, lanyard, and a lanyard anchor. Although federal OSHA, ANSI, and

Snorkel do not require the use of fall restraint on scissors lift aerial platforms, local, state, or employer rules may require their use.

free-wheeling valve—a needle valve that when adjusted open allows hydraulic fluid to flow through the wheel drive motors. This allows the aerial platform to be pushed or towed without damage to the drive motors.

gradeability—the maximum slope that the aerial platform is capable of travel.

ground fault circuit interrupter—a fast-acting circuit breaker that opens to stop electrical circuit flow if it senses a very small current leakage to ground. Also called GFCI. The GFCI is used to protect personnel against a potential shock hazard from defective electrical tools or wiring.

guardrail system—a vertical barrier around the platform to prevent personnel from falling.

hazardous location—any location that contains, or has the potential to contain, an explosive or flammable atmosphere as defined by ANSI/NFPA

505.

hydraulic tray—a swing-out compartment that holds the electrical panel for the lower controls, the hydraulic directional control valve, the free-wheeling valve, and the hydraulic fluid reservoir, pump and filter.

local concentrated pressure—floor loading pressure of an aerial platform based on the maximum load exerted on one tire and the calculated footprint area of the tire. This value is of concern when the floor surface, on which the machine is being used, needs to be protected from indentations or breakage due to high pressure being exerted on a relatively small area.

lower controls—the controls located at ground level for operating some or all of the functions of the aerial platform.

maximum travel height—the maximum platform height or the most adverse configuration(s) with respect to stability in which travel is permitted by the manufacturer.

Minimum Safe Approach Distance—the minimum safe distance that electrical conductors may be approached when using the aerial platform. Also called M.S.A.D.

overall uniform pressure—floor loading pressure of an aerial platform based on the gross vehicle weight and the rated work load. This value may be of concern when the aerial platform is used on a beam supported floor or surface.

The maximum allowable floor loading pressure is determined its architect or engineer.

personal fall arrest system—a fall protection system that is used while working on an unprotected edge (such as a roof top with no guardrail). This system includes a harness, lanyard or other connecting device, a fall arrestor, an energy absorber or decelerator, an anchorage connector, and a secure anchorage such as a building beam, girders or columns. An aerial platform is not a fall arrest anchorage.

platform—the portion of an aerial platform intended to be occupied by personnel with their tools and materials.

platform height—the vertical distance measured from the floor of the platform to the surface upon which the chassis is being supported.

pothole protection—a mechanical system intended to reduce the likelihood of aerial platform tip-over.

qualified person—a person, who by reason of knowledge, experience, or training is familiar with the operation to be performed and the hazards involved.

rated work load—the designed carrying capacity of the aerial platform as specified by the manufacturer.

SL 20 – 300206

Glossary

scissors structure—the mechanisms used to position the platform relative to the aerial platform chassis.

stow—to place a component, such as the platform, in its rest position.

unrestricted rated work load—the maximum designed carrying capacity of the aerial platform allowed by the manufacturer in all operating configurations.

upper controls—the controls located on or beside the platform used for operating some or all of the functions of the aerial platform.

SL 20 – 300206

A

AC generator, 1-1 aerial platform drive and speed, 7-2 aerial platform stability, 8-4 aerial platform steering, 7-2

American National Standards Institute (ANSI),

1-1 ammeter, 5-1, 6-1

B

batteries, 8-2 battery charger, 6-1 battery condition indicator, 1-1, 5-1, 7-3, 8-9,

9-1 battery disconnect switch, 7-1, 9-1 battery fluid level, 8-2 battery terminals, 8-2 cable ends, 8-2 brakes, 9-3 brake disc, 9-3 brake pin, 9-3 disengaging, 9-4 release cam, 8-4

C

cables and wiring harness, 8-3

Canadian Standards Association (CSA), 1-1 circuit breaker reset button, 7-1, 9-1 component identification, 2-1 control selector switch, 7-1, 9-1

D

DC electrical motor, 8-3 drive motion alarm, 4-1, 8-9 drive speeds, 9-2 drive/lift level sensor interlock, 4-2, 9-2 drive/lift pothole protector interlock, 4-2 drive/lift selector switch, 7-2, 9-1 driving, 9-2, 10-2

E

electrical overload, 7-1 electrical power, 1-1 electrical power outlet, 4-4, 8-9, 9-4 power-input connector, 9-4 electrical system, 2-2, 3-3, 8-2 electrocution hazards, 3-1 emergency lowering, 8-6, 11-1 lowering handle, 4-3, 8-6, 11-1 emergency stop, 7-1, 8-9 button, 7-2 controls, 4-1 switch, 7-1, 8-5 entering or exiting the platform, 3-2

F

fasteners, 8-7 flashing light, 1-1, 4-4, 8-7 free-wheeling valve, 8-4, 11-1 closing, 8-4

G

general maintenance, 6-1 general specifications, 2-2 gradeability, 2-2

25 percent grade, 9-2 ground clearance, 2-2, 4-2, 8-5 ground fault circuit interrupter, 8-9 reset button, 8-9 test button, 8-9 ground strap, 8-4 guardrail system, 8-8 guardrails, 4-2 mid rail, 8-8 removable top rail, 8-8 safety chain, 8-8 swinging gate, 8-8 toeboards, 8-8 top rail, 8-8

H

hoisting, 10-2 horn, 1-1, 4-4, 8-9 button, 7-3, 9-1 hoses, tubes, and fittings, 8-3 routing, 8-3 hour meter, 5-1 hydraulic system, 3-3, 8-3 fluid level, 8-3 fluid recommended, 2-2 hydraulic pump, 8-3

I

inspection, 1-2 interlock, 8-8, 9-2

J

joystick lift and steer, 7-2, 9-1

SL 20 – 300206

Index

Index

L

lanyard anchors, 1-1, 4-4, 8-9 level ground, 3-3 level sensor interlock, 8-6 lifting with a forklift, 10-2 loss of hydraulic power, 11-1 low voltage warning light, 7-1, 7-2, 7-3, 9-1 lower control station, 8-4 lower controls, 4-1, 7-1, 9-1 lowering alarm, 4-1, 8-5, 8-9

M

maintenance, 1-2 manual of responsibilities, 1-2 minimum safe approach distance, 3-1

O

Occupational Safety and Health Administration

(OSHA), 1-1 operation, 3-2 operator’s manual, 8-2 manual holder, 8-2 options, 1-1 overall height, stowed, 2-2 overall length, stowed, 2-2 overall width, 2-2

P

parking brakes, 8-4 placards and decals, 3-3, 8-10 cleaning, 3-3

Snorkel part number, 8-10 platform, 9-3 raising and lowering, 9-3 platform capacity, 3-3 platform extend trigger, 9-3 platform extension, 8-8 platform raise/lower and speed, 7-2 platform raise/lower switch, 7-1, 9-1 positioning safety prop, 4-3 pothole protector interlock, 8-5 interlock test, 8-5 skids, 4-2 preparing for operation, 9-1, 9-2 prestart inspection, 3-2 prestart inspection table, 8-1

R

rated work load, 9-3 reservoir, 8-3 capacity, 2-2 fluid level, 8-3 level indicator, 8-3

S

safety alerts, 1-1 safety prop, 4-3 scissors arm rollers, 8-7 securing for transport, 10-3 slide blocks, 8-7 steering, 9-2 stowing safety prop, 4-3 stowing work platform, 10-1 structures, 8-7 mechanical, 8-7 weldments, 8-7 swinging gate, 1-1, 4-2 swing-out tray, 8-2, 9-4 latch keeper, 9-4

T

tie-down lugs, 10-1 tip-over and falling hazards, 3-3 tires, 2-2 toeboard height, 2-2 towing, 11-1 training, 1-1 transporting work platform, 10-1 turning radius, 2-2

U

upper control station, 8-8 upper controls, 4-1, 7-2, 9-1

W

wheel lug nuts, 8-4 winching work platform, 10-1 windy or gusty conditions, 3-3 work place inspection and practices, 3-2 working height, 2-2

SL 20 – 300206

LIMITED WARRANTY

Snorkel warrants each new machine manufactured and sold by it to be free from defects in material and workmanship for a period of one (1) year from date of delivery to a Customer or for one year after the machine has been placed in first service in a

Dealer rental fleet, whichever comes first. Any part or parts which, upon examination by the Snorkel Service Department, are found to be defective, will be replaced or repaired, at the sole discretion of Snorkel, through its local Authorized Dealer at no charge.

Snorkel further warrants the structural components; specifically, the mainframe chassis, turntable, booms and scissor arms, of each new machine manufactured by it to be free from defects in material and workmanship for an additional period of four

(4) years. Any such part or parts which, upon examination by the Snorkel Service Department, are found to be defective will be replaced or repaired by Snorkel through its local Authorized Dealer at no charge; however, any labor charges incurred as a result of such replacement or repair will be the responsibility of the Customer or Dealer.

The Snorkel Service Department must be notified within forty-eight (48) hours of any possible warranty situation during the applicable warranty period. Personnel performing warranty repair or replacement must obtain specific approval by Snorkel

Service Department prior to performing any warranty repair or replacement.

Customer and Dealer shall not be entitled to the benefits of this warranty and Snorkel shall have no obligations hereunder unless the “Pre-Delivery and Inspection Report” has been properly completed and returned to the Snorkel Service

Department within ten (10) days after delivery of the Snorkel product to Customer or Dealer’s rental fleet. Snorkel must be notified, in writing, within ten (10) days, of any machine sold to a Customer from a Dealer’s rental fleet during the warranty period.

At the direction of the Snorkel Service Department, any component part(s) of Snorkel products to be replaced or repaired under this warranty program must be returned freight prepaid to the Snorkel Service Department for inspection. All warranty replacement parts will be shipped freight prepaid (standard ground) from the Snorkel Service Department or from Snorkel’s

Vendor to Dealer or Customer.

REPLACEMENT PARTS WARRANTY

Any replacement or service part made or sold by Snorkel is not subject to the preceding Limited Warranty beyond the normal warranty period of the machine upon which the part was installed.

THIS WARRANTY EXCLUDES AND SNORKEL DOES NOT WARRANT:

1. Engines, motors, tires and batteries which are manufactured by suppliers to Snorkel, who furnish their own warranty.

Snorkel will, however, to the extent permitted, pass through any such warranty protection to the Customer or Dealer.

2. Any Snorkel product which has been modified or altered outside Snorkel’s factory without Snorkel’s written approval, if such modification or alteration, in the sole judgment of Snorkel’s Engineering and/or Service Departments, adversely affects the stability, reliability or service life of the Snorkel product or any component thereof.

3. Any Snorkel product which has been subject to misuse, improper maintenance or accident. “Misuse” includes but is not limited to operation beyond the factory-rated load capacity and speeds. “Improper maintenance” includes but is not limited to failure to follow the recommendations contained in the Snorkel Operation, Maintenance, Repair Parts Manuals.

Snorkel is not responsible for normal maintenance, service adjustments and replacements, including but not limited to hydraulic fluid, filters and lubrication.

4. Normal wear of any Snorkel component part(s). Normal wear of component parts may vary with the type application or type of environment in which the machine may be used; such as, but not limited to sandblasting applications.

5. Any Snorkel product that has come in direct contact with any chemical or abrasive material.

6. Incidental or consequential expenses, losses, or damages related to any part or equipment failure, including but not limited to freight cost to transport the machine to a repair facility, downtime of the machine, lost time for workers, lost orders, lost rental revenue, lost profits or increased cost.

This warranty is expressly in lieu of all other warranties, representations or liabilities of Snorkel, either expressed or implied, unless otherwise amended in writing by Snorkel’s President, Vice President-Engineering, Vice President-Sales or Vice

President-Marketing.

SNORKEL MAKES NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION OF THIS LIMITED WARRANTY.

SNORKEL MAKES NO IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE

AND DISCLAIMS ALL LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING BUT NOT

LIMITED TO INJURY TO PERSONS OR PROPERTY.

The Customer shall make all warranty claims through its local Authorized Dealer and should contact the Dealer from whom the Snorkel product was purchased for warranty service. Or, if unable to contact the Dealer, contact the Snorkel Service

Department for further assistance.

Effective July 1995