JANUARY 2018
01-00054+ (MB20 )/ 01-00071+(MB26)
MB 20/26J
ENGLISH
When contacting Snorkel for service or parts
information, be sure to include the MODEL
and SERIAL NUMBERS from the equipment
nameplate. Should the nameplate be missing, the
SERIAL NUMBER is also stamped on top of the
chassis above the front axle pivot.
Nameplate
The Work Platform Nameplate is located
externally at the FRONT of the chassis
When contacting Snorkel for service or parts information, sure to include the MODEL and SERIAL
NUMBERS from the equipment nameplate.
The MB20/26J work platform meets and exceeds the requirements of both:
En280:2001 and ANSI A92.5 (1999)
All personnel shall carefully read, understand and follow all safety rules and operating instructions before
operating or performing maintenance on any Snorkel aerial work platform.
Safety Rules
Electrocution Hazard Tip Over Hazard Collision Hazard Fall Hazard
THIS MACHINE IS NOT
INSULATED!
NEVER elevate the platform or drive
the machine while elevated unless the
machine is on a firm, level surface.
NEVER position the platform without
first checking for overhead obstructions
or other hazards.
NEVER climb, stand, or sit on
platform guardrails or midrail.
USE OF THE WORK PLATFORM: This aerial work platform is intended to lift persons and his tools as well as the material used for the
job. It is designed for repair and assembly jobs and assignments at overhead workplaces (ceilings, cranes, roof structures, buildings
etc.). All other uses of the aerial work platform are prohibited!
THIS WORK PLATFORM IS NOT INSULATED! For this reason it is imperative to keep a safe distance from live parts of electrical
equipment! - DO NOT get closer than the minimum distance recommended by the “National Regulations”.
Exceeding the specied permissible maximum load is prohibited! See “Specications - Platform Capacity” for details.
The use and operation of the aerial work platform as a lifting tool or a crane is prohibited!
NEVER exceed the manual force allowed for this machine. See “Manual Force” on page 2 for details.
DISTRIBUTE all platform loads evenly on the platform.
NEVER operate the machine without rst surveying the work area for surface hazards such as holes, drop-offs, bumps, curbs, or debris;
and avoiding them.
OPERATE machine only on surfaces capable of supporting wheel loads.
NEVER operate the machine when wind speeds exceed this machine’s wind rating. See “Beaufort Scale” on page 1 for details.
NEVER attach notice boards etc. to the platform, as this will increase wind loading.
IN CASE OF EMERGENCY push EMERGENCY STOP switch to deactivate all powered functions.
IF ALARM SOUNDS while platform is elevated, STOP, carefully lower platform. Move machine to a rm, level surface. Climbing up the
railing of the platform, standing on or stepping to or from the platform onto buildings, steel or prefabricated concrete structures, etc. is
prohibited!
Dismantling the entry gate or other railing components is prohibited! Always make certain that the entry gate is closed and securely
locked!
It is prohibited to keep the entry gate in an open position when the platform is raised!
To extend the height or the range by placing of ladders, scaffolds or similar devices on the platform is prohibited!
NEVER perform service on machine while platform is elevated without blocking elevating assembly.
INSPECT the machine thoroughly for cracked welds, loose or missing hardware, hydraulic leaks, loose wire connections, and damaged
cables or hoses before using.
VERIFY that all labels are in place and legible before using.
NEVER use a machine that is damaged, not functioning properly, or has damaged or missing labels.
To bypass any safety equipment is prohibited and presents a danger for the persons on the aerial work platform and in its working
range.
NEVER charge batteries near sparks or open ame. Charging batteries emit explosive hydrogen gas.
Modications to the aerial work platform are prohibited or permissible only at the approval by Snorkel.
AFTER USE, secure the work platform from unauthorized use by turning the keyswitch off and removing key.
The driving of MEWP’s on the public highway is subject to Regulations made under the Road Trafc Acts.
ENVIRONMENTAL TEMPERATURE LIMITATION, The machine is primarily for use in normal ambient temperatures and conditions
ranging between 50c to -20c.
! !
WARNING
NOTES:
Contents
CONTENTS PAGE NUMBER
1. INTRODUCTION 1 - 1
SPECIAL INFORMATION 1 - 1
SPECIAL LIMITATIONS 1 - 1
MANUAL FORCE 2 - 1
PLATFORM CAPACITY 2 - 1
BEAUFORT SCALE 2 - 1
2. GENERAL DESCRIPTION 2 - 2
Figure 2. Work Platform 2 - 2
3. SAFETY INSPECTION 2 - 3
Figure 3. Battery Fill & Valve 2 - 3
Figure 4. Lower Control Panel 2 - 4
Figure 5. Joystick 2 - 5
4. OPERATION OF THE PLATFORM CONTROLS 2 - 6
UPPER CONTROL PANEL 2 - 7
Figure 3. Upper Control Panel 2 - 7
CONTROL FUNCTIONS 2 - 7
Table 1. Platform Controls and Indicators 2 - 7
LOWER CONTROL PANEL 2 - 9
Figure 4. Lower Control Panel 2 - 8
TYPICAL OPERATION 2 - 9
CONTROLS AND INDICATORS 2 - 9
ELEVATING & LOWERING THE WORK PLATFORM 2 - 9
TRAVEL WITH WORK PLATFORM LOWERED 2 - 10
TRAVEL WITH WORK PLATFORM ELEVATED 2 - 10
EMERGENCY SITUATIONS 2 - 11
EMERGENCY LOWERING (BY HAND) 2 - 11
Figure 8. Emergency Lowering - Mast Valve 2 - 11
Figure 9. Emergency Lowering - Jib Valve 2 - 11
5. TRANSPORTATION 2 - 12
MACHINE WEIGHTS 2 - 12
Figure 3. Lifting by Forklift 2 - 12
LIFTING BY CRANE 2 - 13
Figure 4. Lifting by Crane 2 - 13
TRANSPORT BY TRUCK 2 - 14
Figure 5. Securing the platform 2 - 14
TOWING & WINCHING VALVES 2 - 14
Figure 6. Valve Block-Towing Valves 2 - 15
6. AFTER USE & STORAGE 2 - 15
AFTER USE EACH DAY 2 - 15
HOUR METER 2 - 16
LONG-TERM STORAGE 2 - 16
PRESERVATION 2 - 16
Figure 3. Battery Disconnect 2 - 16
BATTERIES 2 - 16
DAILY MAINTENANCE CHECKLIST 2 - 17
Daily Maintenance Checklist 2 - 17
7. SPECIFICATIONS MB20J 2 - 18
MB26J 2 - 18
1. Introduction
1 - 1
!
!
Indicates a potentially hazardous situation which, if not avoided, could
result in severe injury or death.
W A R N I N G
1. Introduction
1.1 INTRODUCTION
PURPOSE & LIMITATIONS
This Service & Parts Manual is designed to provide instructions and illustrations for the
safe operation and maintenance of the MB20J & MB26J Work Platform manufactured
by Snorkel. The purpose of this machine is to provide fast and safe access to difcult to
reach areas. The machine may only safely operated on rm level ground. Refer to the
Specication section for the machines access limitations.
DO NOT use on soft ground or on slopes greater than 2 degrees.
DO NOT use the lifting mechanism to raise or lower goods or persons except within the
cage and subject to the weight limitations.
DO NOT enter the platform from a structure, rack or other platform.
ENVIRONMENTAL TEMPERATURE LIMITATION, The machine is primarily for use in
normal ambient temperatures and conditions ranging between 50c to -20c.
SCOPE
This manual includes the procedures and responsibilities for the inspection, transportation,
safe operation, maintenance, and repair of this product. The Maintenance Section within
the Parts & Service Manual also covers preventative maintenance and troubleshooting.
SPECIAL INFORMATION
Throughout this manual the users attention is drawn to these special warning boxes:
1.2 GENERAL DESCRIPTION
The MB20/26J are self propelled, fast acting aerial work platforms, designed to raise two
operators with hand tools to a platform oor height of 6.00 m and 7.76 m respectively. The
accessible height is approximately 2.00 m above these gures. It is designed to travel with
safe working load and work tools up to an upper limit, See table on page 2-18 / 2-19.
The unit offers the ability to reach over obstacles but must be used on rm and level ground
at all times.
Indicates an imminently hazardous situation which, if not avoided, will
result in severe injury or death.
! !
D A N G E R
!
!
Indicates a potentially hazardous sit uation which, if not avoided, may
result in minor or moderate injury.
C A U T I O N
1. Introduction
1 - 2
PLATFORM
The MB20/26J platform is large enough for two operators indoors, one outdoors and has
a free-draining perforated oor with 150 mm toeboards. Hand-rails are constructed from
Steel tubing and a safety drop-bar is provided at the entrance. Safety restraint harness
anchor points are also tted in the oor of the platform. These must be used at all times.
The main controls are tted to this platform.
PLATFORM CONTROLLER
The primary (Upper) control box is permanently tted to the front of the platform. It features
a joystick which provides proportional control for raising or lowering the mast, raising or
lowering the jib or rotating the complete mast assembly. The same joystick is also used to
drive and steer the machine.
A safety Interlock Switch or ‘deadman button’ is incorporated into the Joystick. It must be
activated at all times in order to operate any function. This feature allows for one-handed
operation. A comprehensive explanation of control functions is given in the Operators
Manual - a copy of which shall be located in the platform document wallet located just
beneath the upper control station in the platform.
The secondary (Lower) control box is tted to the mast cover at arm level. It features a
‘deadman’ enable button and selector buttons to provide pre-programmed speeds for all
functions except drive and steering. This control station is used primarily for service-type
operations including pre-operation inspection. It should never be used to position a manned
or unmanned platform. It may be used in the event of emergency, however, to lower the
manned platform.
ELEVATING ASSEMBLY
The platform is raised and lowered by a combination of a steel jib and a series of
telescoping mast sections. The main hydraulic cylinder, mounted within the masts, lifts the
2nd mast directly. The other masts are connected by a system of heavy duty plate chains
and pulleys to ensure sequential lifting.
A parallel system of heavy duty straps ensures that the masts descend in the proper
sequence and also ensure that a mast cannot be held in suspension by an obstacle during
descent.
The jib cylinder provides a lifting arc to the jib and cage assembly. All hydraulic functions
are carried out using solenoid operated control valves. Each cylinder features an integral
holding valve to prevent uncontrolled descent in the case of a hose bursting.
!
!
DO NOT use the work platform without guardrails properly
assembled and in place.
W A R N I N G
!
!
NEVER operate the machine from the upper controls until the
platform entrance drop-bar is in the fully lowered position and the
safety harness is tted.
W A R N I N G
1. Introduction
1 - 3
ROTATION GEAR
The complete mast, jib and cage assembly can be rotated to provide a maximum outreach
of 2.6m in the case of the MB20J and 2.96m in the case of the MB26J machine. This
dimension is measured from the centreline of rotation and is carried out by means of an
integral hydraulic motor driving a Worm Drive Unit, around a Slew Gear.
DRIVE & STEER SYSTEM
An electronic controller, mounted in the chassis, is pre-programmed to adjust the upper
speed limit of each individual function. The controller limits the rotational speed of the
electronic motor and oil pump, thereby limiting the maximum oil ow rate.
The following functions are controlled and driven by the electro-hydraulic system:
• Traction Drives (Fwd & Rev) mast stowed/mast raised.
• Steering and Jib elevation.
• Mast elevation, descent and rotation.
• The Jib descent function is gravity operated and is determined by built in ow regulators.
POWER SYSTEM
The Power System (Prime Mover) incorporates four 6V batteries driving a 4KW electrohydraulic pump. The pump drives all hydraulic cylinders and the traction drive motors. A
single multi-valve control block diverts the oil pressure to the individual actuators. The oil
ow rate is limited by the pre-programmed speed setting on the motor but is determined by
the position of the joystick in the Upper Control Box.
1.3 WORKSHOP PROCEDURES
All information contained in this manual is based on the latest product information available
at the time of printing. We reserve the right to make changes at any time without notice.
No part of this publication may be reproduced, stored in retrieval system, or transmitted,
in any form by any means, electronic, mechanical, photocopying, recording, or otherwise,
without the prior written permission of the publisher. This includes text, gures, and tables.
!
!
Detailed descriptions of standard workshop procedures, safety
principles and service operations are not included. Note that this
manual does contain warnings and cautions against some specic
service methods that could cause personal injury, or could damage a
machine or make it unsafe.
Please understand that these warnings cannot cover all conceivable
ways in which service, whether or not recommended by Snorkel,
might be done, or of the possible hazardous consequences of each
conceivable way, nor could Snorkel investigate all such ways.
Anyone using service procedures or tools, whether or not
recommended by Snorkel must satisfy themselves thoroughly that
neither personal safety nor machine safety will be jeopardized. When
in doubt, contact your local distributor or Snorkel.
C A U T I O N
Loading...