General SG24 Operator's Manual

OPERATOR MANUAL

Includes Safety, Service and Replacement Part Information

Model SG24

Series Surface Grinder

Form: GOM3259601

Version 1.2

Do not discard this manual. Before operation, read and

comprehend its contents. Keep it readily available for reference

during operation or when performing any service related

function. When ordering replacement parts, please supply the

following information: model number, serial number and part

number. For customer service assistance, telephone

800.533.0524, +507.451.5510. Our Customer Service Department
telefax number is 877.344.4375 (DIGGER 5), +507.451.5511.

There is no charge for customer service activities .

Internet address: http://www.generalequip.com.

E-Mail location: [e-mail].

Copyright 2003, General Equipment Company.

Manufacturers of light construction

equipment

620 Alexander Drive SW • P.O. Box 334 • Owatonna, Minnesota 55060-0334 USA

Telephone: [phone] • International Telephone: [phone]

Telefax: +507.451.5511 • Sales/Customer Service Department Toll Free: 877.344.4375 (DIGGER 5)

http://www.generalequip.com • e-mail: [e-mail]

Congratulations on your decision to purchase a General light construction product. From our
humble beginnings in 1955, it has been a continuing objective of General Equipment Company to
manufacture equipment that delivers uncompromising value, service life and investment return.
Because of this continuous commitment for excellence, many products bearing the General name
actually set the standards by which competitive products are judged.

When you purchased this product, you also gained access to a team of dedicated and
knowledgeable support personnel that stand willing and ready to provide field support
assistance. Our team of sales representatives and in house factory personnel are available to
ensure that each General product delivers the intended performance, value and investment return.
Our personnel can readily answer your concerns or questions regarding proper applications,
service requirements and warranty related problems.

General Equipment Company places great emphasis upon not only product performance, but also
on product safety. It is important to remember that this product will only be as safe as the operators
which utilize it. It just makes good, common sense to take the time to read and fully understand the
contents of this manual before attempting to utilize this product in service. If you ever do have any
questions or concerns about this product, please feel free to contact our Customer Service
Department at the telephone numbers listed below for assistance.

If there is anything that I can do to assist your efforts when utilizing this product, please do not
hesitate to contact me. For assistance after normal business hours, telephone me at 507.451.9409
or 507.363.1033. If I am not immediately available, I will attempt to return your call as soon as
possible.

Sincerely,

GENERAL EQUIPMENT COMPANY

Dennis Von Ruden
President

DESCRIPTION PAGE

Notice to Operators

Operational Instructional Data Sheet

Safety Precautions

Preparation.
Operation.
Maintenance, Repair and Storage.

Assembly

Removing the Surface Grinder From the Pallet.
Installing the SG24-1000 Safety and Dust Shield Assembly Kit.

Before Starting the Engine

Filling the Engine Crankcase with Oil.
Filling the SG24/G Series Engine Fuel Tank.
Filling the SG24/GHP Propane Cylinder.

Operation

Theory of Operation
Multi-Accessory Attachments and Applications.
Installing a Multi-Accessory Attachment (not including multi-segmented,
dry diamond discs) in the Counterrotating Discs.
Removing a Multi-Accessory Attachment (not including multi-segmented,
dry diamond discs) from the counterrotating discs.
Transporting the Surface Grinder.
Adjusting the Operator Handle Height.
Starting the SG24/E Series Electrically Powered Surface Grinder on the
Job Site .
Starting the SG24/G Series Gaasoline Powered Surface Grinder on the Job
Site.
Procedures for the Safe handling of Propane.
Example of a Propane Emergency Plan.
Starting the SG24/GHP Propane Converted Surface Grinder on the Job
Site.
Counteracting the Propane Refrigeration Effect.
Operating the Surface Grinder on the Job Site.
Stopping the SG24/E Series Electrically Powered Surface Grinder.
Stopping the SG24/G Series Gasoline Powered Surface Grinder.

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Table of Contents

Continues on next page

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 2

DESCRIPTION PAGE

Stopping the SG24/GHP Propane Converted Surface Grinder
Operational Parameters and Techniques for the SG24 Series Surface
Grinder.

Service

Preventative Maintenance Check List.
Checking V-Belt Tension and Alignment.
Installing a Replacement V-Belt, Centrifugal Clutch or Pully.
Replacing the Lord® Type Elastomeric Mounts on the Multi-Accessory
Discs.
Lubrication Requirements.
Electric Motor Service.
Engine Service.

Troubleshooting

Electric Motor.
Engine.
Operational Problems.

Storage

Specifications

Replacement Parts Diagrams

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SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 3

Notice to Operators

IF YOU CAN NOT READ OR DO NOT FULLY UNDERSTAND THE CONTENTS OF THIS
MANUAL, PLEASE CONTACT THE FACTORY FOR PROPER ASSISTANCE BEFORE
ATTEMPTING TO OPERATE THIS PRODUCT.

SI TU NO PUEDES LE'ER O NO COMPRENDES EL CONTENIDO DE ESTE MANUAL
FAVOR DE PONERSE EN CONTACTO CON LA. FABRICA PARA ASSISTENCIA- A
PROPIA ANTES DE INTENTAR PARA OPERAR ESTE PRODUCTO.

SOLLTEN SIE DIESE GEBRAUCHSANWEISUNG NICHT LESEN KOENNEN ODER ES
NICHT VOLLKOMMEN VERSTEHEN, WENDEN SIE SICH BITTE AN DEN
HERSTELLER FUER RICHTIGE HILFE EHE SIE VERSUCHEN DIESES PRODUKT ZU
OPERIEREN.

SI VOUS NE LISEZ OU NE COMPRENDRE ENTIEREMENT LES MATIERES DE CE
MANUEL, S'IL VOUS PLAIT, CONTACTEZ L'USINE POUR L'ASSISTANCE
APPROPRIEE AVANT D'UTILISER LE PRODUIT.

These safety alert symbols identify important safety messages in this manual. When you see these symbols,
be alert to the possibility of personal injury and carefully read the message that follows.

Do not allow anyone to operate the Surface Grinder without first reading this Operator's Manual and
becoming familiar with its operation. The manufacturer of this Surface Grinder has gone to great extremes
to provide the owner(s) and/or operator(s) with the finest equipment available for its intended job function
of providing a variety of industry recognized surface preparation functions on horizontal floor surfaces. Yet,
the possibility exists that the Surface Grinder can be utilized in and/or subjected to job applications not
perceived and/or anticipated by the manufacturer. Such misuse and/or misapplication of the Surface Grinder
can lead to the possibility of serious damage, injury or even death. It is the responsibility of the owner(s)
and/or operator(s) to determine that the Surface Grinder is being utilized and/or operated within the scope
of its intended job function. It is the responsibility of the owner(s) and/or operator(s) to establish, monitor
and constantly upgrade all safety programs and/or practices utilized in and for the operation of the Surface
Grinder. The purpose of such programs is to provide for owner(s') and/or operator(s') safety. Operators must
be instructed to recognize and avoid unsafe conditions associated with their work (29 CFR 1926.21 (b)(2))
and/or applicable updated revisions. It is the responsibility of the owner(s) and/or operator(s) to determine
that no modifications and/or alterations have been made to the Surface Grinder. Modifications and/or
alterations can lead to the possibility of serious damage, injury or even death. It is the responsibility of the
owner(s) and/or operator(s) to make this Operator's Manual available for consultation during all phases of
operation. Refer to OSHA 2207 and/or applicable updated revisions which contains all OSHA job safety and
health rules and regulations (1926 and 1910) covering construction.

The concept of powered Surface Grinder has been successfully utilized for many years as a practical
solution to many types of surface preparation requirements. The basic concept is proven and well accepted
within the associated marketplace. Use of a Surface Grinder requires strenuous work activity. This type of
work activity can be considered to be greater in magnitude than that experienced with the use of many other
types of both light construction and lawn and garden related equipment. This type of work activity should

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 4

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 5

only be attempted by operators of adequate physical size and stature, mental awareness and physical
strength and condition. The body parts most noticeably affected during any specific process are the arms,
hands, wrists, shoulders, lower back and legs. The process can also produce excessive stress/strain
directly to the back muscles, spinal vertebrae and many other body parts. Back related pain can be a side
effect of utilizing a Surface Grinder. An operator with a chronic back related problem or a history of back
and/or other medically related problems should not attempt to utilize the Surface Grinder. Use of the Surface
Grinder may only aggravate this and any other medically related problem. Because of the diverse type of
prevailing job applications, job site conditions, operator experience levels and operator physical
characteristics, no warranty, guarantee, representation and/or liability is made by the manufacturer as to the
absolute correctness or sufficiency of any operational procedure, operational position and/or technique.
There is no absolute guarantee that an operator of any given experience level, physical size and/or physical
condition will be immune to the possibility of and/or probable physical side effects of the normal use of the
Surface Grinder. Each potential operator must be made aware of and assume the operational and physical
liability described and/or associated with the use of the Surface Grinder. Improper use of the Surface
Grinder can result in property damage and/or personal injury, including death. Each potential operator not
willing to assume the operational and physical liability described and/or associated with the use of the
Surface Grinder, should not operate it. Proper levels of operator experience, skill and common sense are
essential for maximizing the safe and efficient operation of the Surface Grinder.

Record the Surface Grinder and engine/electric motor serial numbers in the spaces provided below.

_______________ Model Number

_______________ Serial Number

_______________ Engine/Electric Motor Serial Number

_______________ Date of Purchase

Specifications and design are subject to change without notice or obligation. All specifications are general
in nature and are not intended for specific application purposes. General Equipment Company reserves
the right to make changes in design, engineering or specifications and to add improvements or discontinue
manufacture at any time without notice or obligation. General Equipment Company and its agents accept no
responsibility for variations which may be evident in actual products, specifications, pictures and
descriptions contained in this publication.

Operator Instructional Data Sheet

The following undersigned operators of the Surface Grinder described and/or pertaining to this Operator's
Manual have received formal safety and operational information/instruction from the undersigned
owner(s)/instructor(s) in accordance to OSHA 29 CFR 1926.21 (b)(2) and/or applicable updated revisions
pertaining to, but not necessarily limited to the:

1) READING, COMPREHENSION AND ACKNOWLEDGEMENT OF THE MATERIAL COMPRISING THE
ENTIRE CONTENTS OF THE APPLICABLE OPERATOR'S MANUAL AND SAFETY AND OPERATIONAL
INFORMATION VIDEO TAPE FOR THE SURFACE GRINDER.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 6

2) FORMALIZED OPERATOR'S SAFETY PROGRAM TO BE DEVISED BY THE OWNER OF THE
SURFACE GRINDER IN CONJUNCTION WITH THE CONTENTS OF THE APPLICABLE OPERATOR'S
MANUAL, SAFETY AND OPERATIONAL INFORMATION VIDEO TAPE FOR THE SURFACE GRINDER
AND THE APPLICABLE MATERIAL INCLUDED IN THE NATIONAL ELECTRIC CODE®.

3) OSHA AND NATIONAL ELECTRIC CODE® RULES AND REGULATIONS RESEARCHED FOR
AND/OR BY THE OWNER OF THE SURFACE GRINDER AND DEEMED APPLICABLE TO THE SAFE
AND PROPER USE AND/OR OPERATION OF THE SURFACE GRINDER FOR ANY SPECIFIC JOB
APPLICATION.

4) LOCAL LAWS, REGULATIONS AND CUSTOMS RESEARCHED FOR AND/OR BY THE OWNER OF
THE SURFACE GRINDER AND DEEMED APPLICABLE TO THE SAFE AND PROPER USE AND/OR
OPERATION OF THE SURFACE GRINDER FOR ANY SPECIFIC JOB APPLICATION.

5) FORMALIZED MAINTENANCE PROGRAM FOR THE SURFACE GRINDER TO BE DEVISED BY THE
OWNER OF THE SURFACE GRINDER IN ACCORDANCE WITH, BUT NOT NECESSARILY LIMITED TO,
THE SPECIFICATIONS, GUIDELINES AND OPERATIONAL INFORMATION CONTAINED IN THE
APPLICABLE OPERATOR'S MANUAL.

6) COMPREHENSIVE OPERATIONAL INSTRUCTIONS FOR THE CORRECT AND PROPER USE OF
THE SURFACE GRINDER AS PER THE CONTENTS OF THE APPLICABLE OPERATOR'S MANUAL,
SAFETY AND OPERATIONAL INFORMATION VIDEO TAPE AND APPLICABLE MATERIAL INCLUDED
IN THE NATIONAL ELECTRIC CODE®.

_______________ Operator _______________ Owner/Instructor __________ Date

_______________ Operator _______________ Owner/Instructor __________ Date

_______________ Operator _______________ Owner/Instructor __________ Date

_______________ Operator _______________ Owner/Instructor __________ Date

_______________ Operator _______________ Owner/Instructor __________ Date

_______________ Operator _______________ Owner/Instructor __________ Date

NOTE: INSERT COPIES OF THIS PAGE WITHIN THE OPERATOR'S MANUAL IF SPACE FOR
ADDITIONAL OPERATORS IS REQUIRED.

Safety Precautions

THE FOLLOWING SAFETY PRECAUTIONS
PROVIDE SOME COMMON SENSE GUIDES TO
PROMOTE SAFETY AND EFFICIENCY WITH THE
SURFACE GRINDER. NO WARRANTY,
GUARANTEE OR REPRESENTATION IS MADE BY
THE MANUFACTURER AS TO THE ABSOLUTE
CORRECTNESS OR SUFFICIENCY OF ANY
INFORMATION OR STATEMENT. THESE SAFETY
PRECAUTIONS ARE INTENDED TO DEAL
PRINCIPALLY WITH COMMON PRACTICES AND
CONDITIONS ENCOUNTERED IN THE USE OF THE
SURFACE GRINDER AND ARE NOT INTENDED TO
BE ALL INCLUSIVE. PROPER LEVELS OF
OPERATOR EXPERIENCE, SKILL AND COMMON
SENSE ARE ESSENTIAL FOR SAFE AND
EFFICIENT OPERATION.

THE ENGINE EXHAUST FROM THIS PRODUCT
CONTAINS CHEMICALS KNOWN TO THE STATE
OF CALIFORNIA TO CAUSE CANCER, BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM.
THIS STATEMENT IS MADE IN COMPLIANCE TO
CALIFORNIA PROPOSITION 65.

INCORRECT USE OF THE SURFACE GRINDER
CAN RESULT IN PROPERTY DAMAGE, PERSONAL
INJURY OR EVEN DEATH. TO REDUCE THIS
POSSIBILITY, GIVE COMPLETE AND UNDIVIDED
ATTENTION TO THE JOB AT HAND AND FOLLOW
THESE SAFETY PRECAUTIONS:

PREPARATION.

1) This Surface Grinder is a specialized type of
powered equipment, designed for a specific job
function and requires adequate and thorough
instruction BEFORE it is operated. The size, power,
complexity and operating characteristics of this type of
powered equipment would dictate that each operator

must receive adequate, professional instruction
regarding the proper operation of this Surface Grinder
before being allowed to utilize it. BEFORE attempting
to utilize this Surface Grinder, read this Operator's
Manual, the applicable Safety and Operating
Information Video Tape and the material supplied by
the engine manufacturer to familiarize each operator
with its correct operating procedures. Avoid the urge
not to take the necessary time to read this Operator's
Manual before operating the Surface Grinder. DO NOT
OPERATE THE SURFACE GRINDER UNTIL EACH
OPERATOR COMPLETELY COMPREHENDS THE
CONTENTS OF THIS MANUAL AND THE
APPLICABLE SAFETY AND OPERATIONAL
INFORMATION VIDEO TAPE.

2) Develop a comprehensive program for the safe
operation of the Surface Grinder by its owner(s) and/or
operator(s). Such a program will include, but is not
limited to: instructional requirements for operation,
applicable OSHA requirements, local laws and
regulations, job site safety and a Surface Grinder
maintenance program. Constantly examine and
upgrade this program to guarantee owner(s) and/or
operator(s) safety. Each operator must be fully
instructed regarding the specifics of this safety
program.

3) Determine that the Surface Grinder is in its original,
factory configuration and has not been modified in any
manner. Many modifications can result in potentially
dangerous configurations that can lead to property
damage and/or personal injury. If there are any
questions about possible modifications made to the
Surface Grinder, contact the Customer Service
Department for specific information BEFORE
utilization. There is no charge for this service. Do not
operate the Surface Grinder without the use of the
original equipment V-belt guard. Use of the Surface
Grinder without an approved belt guard can lead to
property damage and/or personal injury.

4) Minors should never be allowed to operate the
Surface Grinder. Bystanders, especially children and
animals, should not be allowed in the area where the
Surface Grinder is in use. The grinding process can
result in flying particles being emitted at high velocity
and striking the operator and/or onlookers. This can
lead to the possibility of property damage and/or
personal injury. Keep all body parts, loose clothing,
foreign objects and onlookers clear of the rotating
discs, multi-accessory attachments and flying particles.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 7

5) Operators must be in adequate physical condition,
mental health and not under the influence of any
substance (drugs, alcohol, etc.) which might impair
vision, dexterity or judgment. Working with the Surface
Grinder is strenuous. If you have any condition that
might be aggravated by strenuous work, check with
your doctor BEFORE operating the Surface Grinder.
Guard against the possibility of back related injuries.
Always lift the Surface Grinder with leg muscles and
not with the back.

6) Prolonged use of the Surface Grinder (or other,
similar machines) exposes the operator to vibrations
which may produce Whitefinger Disease (Raynaud's
Phenomenon). This phenomenon reduces the hand's
ability to feel and regulate temperature, produces
numbness and burning sensations and may cause
nerve and circulation damage and tissue necrosis.
Antivibration systems do not guarantee that you will not
sustain Whitefinger Disease. Therefore, continuous
and regular users should closely monitor the condition
of their hands and fingers. After each period of use,
exercise to restore normal blood circulation. If any of
the symptoms appear, seek medical advice
immediately.

7) Clothing must be sturdy and snug fitting, but allow
complete freedom of movement. Never wear loose
fitting jackets, scarves, neckties, jewelry, flared or
cuffed pants or anything that could become caught on
controls or moving parts. Wear long pants to protect
your legs. Protect your hands with heavy duty, nonslip
gloves to improve your grip. Good footing is most
important when operating the Surface Grinder. Wear
sturdy boots with nonslip soles. Steel-toed safety
shoes are highly recommended. Never wear tennis
shoes or other, similar type shoes which afford little or
no protection. Wear an approved safety hard hat to
protect the operator'(s') head(s) where there is a
danger of head injuries. Noise, generated by the
engine of the Surface Grinder and the actual process
itself, can damage your hearing. Wear approved sound
barriers (ear plugs or ear mufflers) to protect your
hearing. Continuous and regular operators should
have their hearing checked regularly.

8) Visually inspect the Surface Grinder, components,
tools and accessories for damaged or worn parts.
BEFORE each use:

a) Disconnect the engine spark plug wire or power
source cable.

b) Clean and remove all accumulated foreign matter
from the wheels and determine that each rotates freely.

c) Clean and remove all accumulated foreign matter
from inside the main frame area.

d) Inspect the V-belt drive for proper tension, wear and
general condition. Replace each component as
necessary.

e) Inspect the multi-accessory discs and gimbal head
assemblies for excessive wear and structural integrity.
Replace each component as necessary. The multi­accessory discs rotating at high speed during the
specific process can be subject to high wear rates if the
installed attachment is not properly maintained and/or
replaced at regular service intervals.

f) Determine that operator controls work freely, all
safety devices are operative and information decals
are readable.

g) Check to see that the Surface Grinder and all related
accessories are in good, mechanical condition
BEFORE utilization.

h) Reconnect the spark plug wire or power source
cable as applicable.

9) Contact appropriate representatives to determine
if/where electrical cables, gas lines and other
hazardous items are buried under the work surface
BEFORE utilization. The Surface Grinder and related
accessories are not insulated. Contact with buried
electrical cables, gas lines and other hazardous items
can result in electrocution and/or an explosion.

10) Know how the controls operate. Know how to stop
the engine or electrical motor quickly in an emergency.
Always start the engine or electric motor according to
the instructions as outlined in this manual to minimize
the possibility of unexpected contact with the work
surface. Unexpected contact with the work surface can
cause loss of machine control, and the possibility of
property damage and/or personal injury.

11) Ground the SG24/E electrically powered Surface
Grinder motor securely. Determine that any
"grounding" wire and/or device is, in fact, properly
grounding the motor. Failure to properly ground the
motor may cause an electrical shock and/or
electrocution, resulting in property damage and
personal injury including death. Electrical wiring and all
connections should be performed by a qualified
electrician. Depending upon the wiring configuration,
the electric motor is designed to operate from either
115 or 230 volt, AC power sources. Determine that the
electric motor voltage switch is properly selected

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 8

according to the intended and/or available power
source. Operating the electric motor from an improper
voltage/amperage power source can result in property
damage and/or personal injury.

12) When operating the SG24/E electrically powered
Surface Grinder on a surface containing water or other
electrically conducting liquid, special precautions must
be taken to minimize the possibility of operator
electrocution. One such precaution is to wire and
operate the electric motor from a clean, 20 Ampere,
115 Volt AC power source in conjunction with a ground
fault circuit interrupter (GFCI). A GFCI is a safety
device that disconnects power from a circuit to a load
when a potentially dangerous condition occurs. The
GFCI opens the circuit when the fault current flow from
a power line to a ground exceeds the safe limit for
humans. The GFCI protects against harmful electrical
shock to a person caused by contact with a defective
electrical product. A GFCI differs from a fuse or circuit
breaker. A fuse or circuit breaker opens the circuit
when the total current flow in the power line exceeds
the safe limit of the power line. They are designed to
protect against fire caused by overheating of the power
line. Use of a GFCI gives on the job protection from
electrical shock hazards caused by ground faults in
commercial, industrial and residential applications.
They are simple and easy to use: plug a portable GFCI
into any suitable, grounded extension cord and plug
the Surface Grinder into the GFCI for automatic
protection against ground faults. For specific
information, consult current National Electrical Code®
publications and OSHA publications 210-22D (or
current revision) for construction sites and 555-3 (or
current revision) for use around any area containing
water.

13) Never exceed the recommended capacities of the
Surface Grinder. Refer to the Specifications section of
this manual for more detailed information.

OPERATION.

1) Give complete and undivided attention to the job at
hand. Do not chew gum, smoke and/or use smokeless
tobacco while utilizing the Surface Grinder. Do not
attempt to eat and/or drink while utilizing the Surface
Grinder. Determine that eyeglasses and/or hearing aid
devices are properly secured.

Use of the Surface Grinder is strenuous and causes
fatigue. Help prevent the cause of an accident. Plan to
take work breaks as required to help maintain proper
mental and physical alertness.

2) This Surface Grinder is not sealed or insulated. Do
not operate this machine in an explosive atmosphere
or near combustible materials. Refer to current OSHA
and National Electric Code® rules and regulations.

3) Gasoline is an extremely flammable fuel. Use
extreme caution when handling gasoline or mixing fuel.
Always utilize UL® and/or CSA® approved containers
for the storage and transportation of fuel. Do not smoke
or bring fire or flame near the fuel. Always shut off the
engine and allow it to cool before refueling. Never
remove the fuel tank filler cap while the engine is
running. Never operate an engine without a fuel tank
filler cap. Select bare ground for fueling and move at
least 10 feet from the fueling spot before starting the
engine. Wipe off any spilled fuel before starting the
engine and check for leakage. If a fuel or oil leak is
found, do not start or run the engine until the leak is
fixed and the spillage has been wiped away. Take care
not to get fuel or oil on your clothing. If this happens,
change your clothing immediately. Before operating the
Surface Grinder, refer to the Specifications section of
this manual for more detailed information regarding
fuel and lubrication requirements.

4) The Surface Grinder is designed for use by one
operator. Use of the Surface Grinder by more than one
operator can lead to confusion and loss of control,
resulting in property damage and/or personal injury. If
it is felt that more than one person is required to
operate the Surface Grinder, STOP and contact the
Customer Service Department for specific operational
and service/maintenance information. There is no
charge for this service.

5) Do not operate the Surface Grinder with onlookers
close by. Caution all onlookers to stand clear. The
grinding process can result in flying particles being
emitted at high velocity and striking the operator and/or
onlookers This can lead to the possibility of property
damage and/or personal injury. Keep all body parts,
loose clothing and foreign objects clear of the rotating
drum and flails.

6) Start the engine or electric motor according to the
instructions as outlined in this manual to minimize the
possibility of unexpected contact with the work surface.
Unexpected contact with the work surface can cause
the loss of machine control and the possibility of
property damage and/or personal injury.

7) Start and operate the Surface Grinder only in a well
ventilated area. Carbon Monoxide fumes given off by
an engine are poisonous. Breathing these fumes can

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 9

result in property damage and/or personal injury.
Operate the Surface Grinder only when/where visibility
and light are adequate for the job at hand. Work
carefully. Always hold the operator handle firmly with
both hands. Wrap your fingers around the handle,
keeping it cradled between your thumbs and fingers.
Always make sure the operator handle is in good
condition and free of moisture, pitch, oil or grease.
Wear gloves to improve your grip. Never leave the
Surface Grinder running unattended.

8) Special care must be exercised on slippery
conditions and on difficult, uneven surfaces. Watch for
cracks, high spots and other, surface irregularities.
Keep proper footing and balance at all times. The
normal use of this machine is on level surfaces. Other
terrains can be dangerous and should be avoided.
Only properly trained operators should attempt these
techniques.

9) Never start the engine or electric motor with the
Surface Grinder directly over cracked, uneven or
irregular surfaces. Start the engine or electric motor
according to the instructions as outlined in this manual.

10) Contact with a hot, engine muffler can cause
property damage and/or personal injury. Remain clear
of a hot, engine muffler. Do not over speed the engine
by altering the governor setting or by disconnecting the
engine governor. Serious damage to the engine and/or
personal injury can result.

11) Clean and remove all accumulated foreign matter
from inside the main frame area after each use. This
practice will maximize bearing and V-belt service life.

12) Because this Surface Grinder is classified as a low
cost, hand held, low horsepower, portable type
machine, it is limited in the number of practical and/or
suitable job applications. A particular job site, actual
surface conditions, job specifications and operator
skill/common sense may dictate that a different type of
machine (with characteristics of higher purchase cost,
being mounted to a carrier vehicle, with greater
horsepower and less mobility), method and/or process
be utilized to properly complete the job with the degree
of efficiency and safety required. Contact the Customer
Service Department for specific information regarding
suitable job applications, job sites surface conditions
and operator experience/skill/common sense
recommendations for this Surface Grinder BEFORE
utilization. There is no charge for this service.

MAINTENANCE, REPAIR AND STORAGE.

1) Use only genuine, approved replacement parts and
accessories for maintenance and repair. Use of parts
and accessories manufactured by others can result in
property damage and/or personal injury.

2) Follow the Service instructions as outlined in the
appropriate section of this manual.

3) Always stop the engine and disconnect the spark
plug wire or power source cable BEFORE checking or
working on the Surface Grinder.

4) Always properly maintain the Surface Grinder.
Frequently check all fasteners and individual parts.
Built in safety features are effective only if they are
maintained in good working condition. Replace any
questionable part or assembly with a genuine, factory
approved, replacement part. Do not forsake proper
maintenance for the price of a few replacement parts.
Proper maintenance does not cost... it actually pays
dividends. Do not attempt any maintenance repair
work not described in this manual. Have such work
performed at your dealer's service facility.

5) A worn or damaged engine muffler is a fire hazard
and may cause loss of hearing. Check to see that the
muffler is in good condition. If the muffler is equipped
with a spark arresting device, determine that it is in
proper working condition at regular service intervals.
Replace the spark arresting device with an approved
replacement if there is any question of its integrity. It is
the responsibility of the owner(s) and/or operator(s) to
provide for and properly maintain a USDA approved,
spark arresting muffler in an operating area specified
by law. Check with appropriate governing agencies for
more specific information. The Surface Grinder must
not be operated if the muffler is faulty or has been
removed. Contact with a hot engine muffler can cause
property damage and/or personal injury.

6) Do not operate the Surface Grinder without the use
of a factory approved V-belt guard that is maintained in
proper structural condition. Frequently inspect the belt
guard for signs of wear, cracks and other signs of
fatigue. If there is any question regarding the structural
integrity and/or condition of the belt guard, properly
dispose and replace with a genuine, factory approved,
replacement part only.

7) Maintain all safety and operation decals in proper
condition. If any decal becomes damaged and/or
unreadable, replace with a genuine, factory approved,
replacement part only.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 10

8) The Surface Grinder utilizes many self locking
hexagon head nuts to minimize the effects of vibration.
Replace all self locking hardware with genuine, factory
approved, replacement parts only.

9) Consult the information supplied by the engine or
electric motor manufacturer for specific information
relative to proper operational, lubrication and storage
requirements.

10) Properly maintain the Propane conversation
components for the SG24/GHP Surface Planer. Keep
foreign objects from inflicting direct contact blows with
the conversion components located next to the engine.
Have only American Gas Association (AGA) and/or
Canadian Gas Association (CGA) certified technician
perform any necessary service work on the Propane
conversion components. Properly utilize, service and
store Propane cylinders according to established
American Gas Association (AGA) and/or Canadian
Gas Association (CGA) recommended practices.
Failure to properly utilize, service and store Propane
cylinders can result in property damage and/or
personal injury.

Assembly

The SG24 Series Surface Grinder is shipped from the
factory secured on a specially designed wooden pallet
and protected from external damage by a corrugated
carton or wood crate. If shipped with a corrugated
carton, the Surface Grinder can be secured to the
pallet by wood laths nailed to the pallet body. Remove
the carton or crate immediately upon receipt using
suitable tools to remove the nails.

REMOVING THE SURFACE GRINDER FROM THE
PALLET.

Application: All Models

Tools Required:

1 each, pliers
1 each, claw hammer or a hammer and an appropriate

pry bar

The Surface Grinder is secured to the pallet with steel
banding. Using the pliers, cut and remove the banding.
The Surface Grinder can then be removed from the
pallet.

WEAR SAFETY GLASSES AND OTHER
APPROPRIATE SAFETY APPAREL WHEN
CUTTING THE STEEL BANDING AND/OR
REMOVING THE CORRUGATED/WOOD SHIPPING
CRATE.

Visually inspect the shipment for freight damage and/or
missing parts. If shipping damage is evident, contact
the delivering carrier immediately to arrange for an
inspection of the damage by their claims
representative. Federal law requires that a claim be
filed within a specific time period. If missing parts are
detected, notify your dealer who will assist you in
obtaining them.

The Surface Grinder is shipped from the factory
completely assembled. If ordered with the Surface
Grinder, multi-accessory attachments are normally
shipped separately to minimize the potential for loss
during shipment.

Check all fasteners for proper security. Consult a
fastener torque chart for the proper torque value if any
fastener is found to require retorquing.

After April 1, 1996, all Surface Grinders are shipped
from the factory with the SG24-1000 Safety and Dust
Shield Assembly Kit included as a standard accessory.
The kit is included in a separate package and is not
normally installed by factory personnel. The owner
and/or operator (has) have the option to install the skirt
assembly for any specific job application. The SG24­1000 Safety and Dust Shield is designed to perform the
following job functions:

1) To contain loose materials within the platform area of
the Surface Grinder as a direct result of a specific
process. This includes materials removed from the
surface as well as any slurry mixture utilized to help
maximize material removal efficiencies.

2) To provide a method for a vacuum system to help
remove airborne dust related materials from within the
skirt assembly. Dust related materials are usually
created as a result of any specific process. A specific
job application may require the reduction and/or
minimization of airborne dust related materials from the
atmosphere while the Surface Grinder is being
operated. The kit includes a hose and necessary
hardware to connect the skirt assembly to the 3 inch

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 11

diameter vacuum attachment fitting located at the rear
of the machine. Use of the kit along with a suitable
vacuum system will not completely remove all airborne
and loose materials directly from the work surface.

THE SG24-1000 SAFETY AND DUST SHIELD
ASSEMBLY KIT IS RECOMMENDED FOR USE
WHERE AND/OR WHEN PERMITTED ON SPECIFIC
JOB APPLICATIONS TO MAXIMIZE OVERALL
SAFETY AND PRODUCTIVITY. FINAL DISCRETION
IS THE RESPONSIBILITY OF THE OWNER(S)
AND/OR OPERATOR(S).

THE USE OF THE SG24-1000 SAFETY AND DUST
SHIELD ASSEMBLY KIT ALONG WITH A SUITABLE
VACUUM SYSTEM TO REMOVE HAZARDOUS
CLASSIFIED, AIRBORNE MATERIALS FROM THE
WORK SURFACE WILL NOT ELIMINATE THE
REQUIREMENT FOR PROPER SAFETY RELATED
EQUIPMENT, OPERATING PLAN AND/OR
PROCEDURES.

USE OF THE SG24-1000 SAFETY AND DUST
SHIELD ASSEMBLY KIT ALONG WITH A SUITABLE
VACUUM SYSTEM WILL NOT COMPLETELY
REMOVE ALL LOOSE MATERIALS FROM THE
WORK SURFACE. HAZARDOUS CLASSIFIED,
LOOSE MATERIALS MUST BE REMOVED FROM
THE WORK SURFACE BY PROCESSES AND/OR
PROCEDURES MEETING THE APPLICABLE OSHA
AND/OR EPA REQUIREMENTS.

INSTALLING THE SG24-1000 SAFETY AND DUST
SHIELD ASSEMBLY KIT

Application: All Models

Tools Required:

1 each, 5/32 inch Allen wrench
1 each, 7/16 inch wrench
2 each, 1/2 inch wrenches
1 each, flat blade screwdriver

1) If the Surface Grinder is powered by an engine,
disconnect the spark plug wire. If powered by an

electric motor, properly disconnect the extension cord
or Surface Grinder from the power source.

2) Using the Allen wrench, remove the PN SG24-0220
bumper guard from the machine.

3) Tilt the Surface Grinder back until the operator
handle comes in contact with the surface. The Surface
Grinder may not be in a stable position in this
configuration. To minimize the possibility of property
damage and/or personnel injury, properly secure an
appropriate weight to the handle for added stability.
Other means can be utilized to support the frame and
provide proper machine stability. Appropriate wheel
chocks are also recommended, FIGURE 1.

EXERCISE EXTREME CAUTION WHEN WORKING
NEAR OR UNDER THE SURFACE GRINDER WITH
THE OPERATOR HANDLE TILTED BACK IN THE
SERVICE POSITION. IF THE SURFACE GRINDER IS
NOT POSITIONED IN A STABLE CONFIGURATION,
WITH ADEQUATE COUNTERWEIGHT PROPERLY
SECURED, UNEXPECTED MOVEMENT CAN
ALLOW THE SURFACE GRINDER TO FALL BACK
TO THE WORK SURFACE. THE RESULT CAN BE
PROPERTY DAMAGE AND/OR PERSONAL INJURY.

4) Using the 7/16 inch wrench, install the PN SG24­0230 rubber skirt around the outside perimeter
surrounding the multi-accessory discs. Secure with the
PN 15040700 cap screws and PN 49050000 washers.
The original bumper and PN 27040800 cap screws
can also be utilized as an alternative attachment
method. The notches in the rubber skirt are provided
as a means to compensate for multi-accessory
attachment wear (if applicable). Adjust the location of
the rubber skirt to provide the necessary clearance
between it and the work surface. Improper clearance
will accelerate skirt wear, FIGURE 2.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 12

FIGURE 1

FIGURE 2

5) Using the 1/2 inch wrenches, the PN SG24-0350
rubber skirt is attached to the middle support member
of the main frame. Proper installation will have the
hose attach fitting that is riveted to the skirt facing the
rear of the machine. The notches in the rubber skirt
are provided as a means to compensate for multi­accessory attachment wear (if applicable). Adjust the
location of the rubber skirt to provide the same
clearance as with the PN SG24-0230 rubber skirt. The
PN SG24-0370 skirt straps provide additional support
for the rear skirt assembly. Properly secure with the PN
15050700 cap screws and PN 53050000 self locking
nuts, FIGURE 3.

FIGURE 3

6) Assemble the two each, PN 56480000 hose clamps
over the PN SG24-0380 vacuum hose. Install the
vacuum hose over the vacuum hose attach fittings.
Determine that the configuration minimizes potential
kinks or depressions which can reduce the airflow.
Secure the hose clamps tight with the screwdriver.

7) The PN SG24-1000 Safety and Dust Shield
Assembly Kit can be removed by reversing the above
procedure and reinstalling the original PN SG24-0220
bumper.

8) Return the Surface Grinder to its normal operating
position.

9) If the Surface Grinder is powered by an engine,
reconnect the engine spark plug wire. If powered by an
electric motor and the machine is to be used
immediately, reconnect the extension cord or Surface
Grinder to the power source. Determine that the
ON/OFF switch located on the operator handle is in the
OFF position.

UNEXPECTED MACHINE START UP CAN RESULT
IN PROPERTY DAMAGE AND/OR PERSONAL
INJURY.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 13

Before Starting the Engine

FILLING THE ENGINE CRANKCASE WITH OIL.

Applications: SG24/G Series and SG24/GHP
Surface Grinder

Note: The SG24/GHP Surface Grinder is shipped with
oil in the engine crankcase and with the Propane
cylinder empty. Units are test run to insure that the
Propane conversion components are functioning
properly. Regular gasoline powered units are selected
at random at the factory and also test run. These units
are shipped with oil in the engine crankcase. Fuel is
drained from the fuel tank and will be marked
accordingly by factory personnel.

Tools Required:

1 each, small, clean funnel

The SG24/G Series Surface Grinder is available
equipped with a variety of industrial quality, gasoline
and diesel engines. Engines are not normally
preserviced at the factory (see note above) and will
require the addition of oil in the crankcase before being
placed in service. Consult the material supplied by the
engine manufacturer for the engine that has been
ordered with your Surface Grinder. Carefully review
this material to become familiar with specific operating
characteristics, recommendations and service
requirements.

1) Determine the location(s) of both the oil filler and oil
drain plug(s).

2) Wipe oil, dust and accumulated dirt from the filler
plug area.

3) Using the funnel, fill the engine crankcase with a
high grade motor oil. Consult the material supplied by
the engine manufacturer for proper amount, weight
and service classification.

4) Replace the oil filler plug and tighten. Wipe off any
excess oil spilled on the engine crankcase and Surface
Grinder.

5) Do not operate the engine unless proper oil level is
maintained as per the material supplied by the engine
manufacturer.

FILLING THE SG24/G SERIES ENGINE FUEL TANK.

Tools Required:

1 each, small, clean funnel

NEVER MIX OIL WITH GASOLINE. FOUR CYCLE
ENGINES ARE NOT DESIGNED TO BE OPERATED
WITH OIL MIXED WITH THE GASOLINE.

1) Determine the location of the fuel tank filler cap.

2) Carefully clean the filler cap and surrounding area to
insure that no dirt or debris falls into the fuel tank.
Remove the filler cap.

3) Using the funnel, fill the fuel tank with fresh, clean
fuel according to the specifications outlined in the
material supplied by the engine manufacturer. Do not
overfill the tank or spill any fuel. If the fuel tank
incorporates a screen mesh to prevent debris from
falling into the tank, do not remove to increase the fill
rate. Replace the filler cap. Wipe away any excess
spilled fuel.

MANY FUELS ARE EXTREMELY FLAMMABLE. DO
NOT SMOKE NEAR THE FUEL TANK. DO NOT FILL
THE FUEL TANK WITH THE ENGINE RUNNING OR
IF IT IS HOT. ALLOW AMPLE TIME BETWEEN
EACH REFUELING FOR THE ENGINE TO COOL.

FILLING THE SG24/GHP PROPANE CYLINDER.

The SG24/GHP Surface Grinder is shipped from the
factory with a Propane conversion kit for the Honda
GXV340 engine and supplied with a standard 20 lb
capacity Propane cylinder. The Propane conversion is
performed by knowledgeable personnel licensed
and/or certified to perform the conversion. A copy of the
original licensing certificate is shipped with each
machine. If the original certificate becomes destroyed
or lost, contact the Customer Service Department for a
duplicate. There is no charge for this service.

Empty Propane cylinders should always be filled
according to established, industry standards by

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 14

qualified personnel. Cylinders should be tested for
structural integrity according to industry standards
and/or local code requirements by qualified personnel
only.

IMPROPER USE, HANDLING AND MAINTENANCE

OF THE PROPANE CYLINDER CAN RESULT IN
PROPERTY DAMAGE AND/OR PERSONAL INJURY.
INSPECT THE CYLINDER, VALVE, FITTINGS,
HOSES AND HARDWARE FOR DAMAGE BEFORE
AND AFTER EACH USE. REPLACE ANY
QUESTIONABLE COMPONENT WITH A FACTORY
APPROVED REPLACEMENT ONLY. DO NOT
ALLOW ANY PERSONNEL TO OPERATE A
PROPANE CONVERTED ENGINE UNTIL PROPER
AND/OR ADEQUATE INSTRUCTION HAS BEEN
GIVEN WITH FULL COMPREHENSION.

PROPANE IS AN EXPLOSIVE GAS. DO NOT
SMOKE OR INTRODUCE AN OPEN FLAME IN OR
NEAR THE PROPANE CYLINDER AT ALL TIMES
WHEN FILLING, OPERATING/UTILIZING THE
SURFACE GRINDER OR PERFORMING ANY
MAINTENANCE.

Operation

THEORY OF OPERATION.

Application: All Models

The SG24 Series Surface Grinders operate on the
principle of various multi-accessory attachments being
utilized at rotational speeds to make direct contact with
a work surface. Various types of multi-accessory
attachments are secured to recesses provided in two,
counterrotating, aluminum discs located on the bottom
of the machine. The specific type of multi-accessory
attachment utilized during the grinding process directly
affects the type of material removed, the material
removal rate and the resulting flatness and
smoothness of the surface.

The grinding process is directly controlled by these

conditions:

1) The use of a suitable mechanism (multi-accessory
attachment) of proper design and configuration to grind
the work surface and remove material while delivering
acceptable service life.

2) Sufficient static weight supporting the multi­accessory attachment to allow it to effectively
penetrate the work surface and remove material.

3) Adequate horsepower capable of propelling the
multi-accessory attachment against the work surface
to deliver acceptable productivity rates.

Since no two materials are exactly alike, no two work
surface materials can be penetrated and removed by
the exact same method. The nature of the grinding
process, along with operator experience, skill and
common sense, would suggest that efficient and
productive material removal is a matter of trial and
error. Combinations of multi-accessory attachment
type, condition, and feed rate are direct factors that will
also determine the overall success of the job
application.

MULTI-ACCESSORY ATTACHMENTS AND
APPLICATIONS.

Application: All Models

While individual multi-accessory attachment design
and configuration may vary, basic operational
characteristics are identical: impact upon a work
surface material and remove a percentage of the
material. This common operational characteristic has
led to the development of the following popular multi­accessory attachments:

Grinding Stones

Grinding stones are available in a number of grades,
including: C06 extra coarse, C10 coarse, C24
medium, C80 fine and C120 super fine grade. All
stones incorporate silicon carbide as the abrasive
medium and employ a clay binder as the matrix
material. Vitrified type stones utilize an oven baking
process that produces greater service life over other
manufacturing processes. As the clay material wears
away, it exposes new, sharp, edges of the imbedded
silicon carbide material. All stones have the identical 2"
x 2" X 4" dimensions and are secured to the machine
by the use of a hardwood wedge, FIGURE 4.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 15

FIGURE 4

The designation system for the grinding stones utilizes
a system similarly utilized for most abrasive products:
the larger the number, the finer the grain structure and
usually, the smoother the resulting finish.

a) The C06 and C10 coarse grade stones are the most
popular utilized stones and result in maximum material
removal rates. They are utilized for general grinding
and the removal of trowel marks, high spots and rough
sections on concrete surfaces. The average service life
is approximately 4 to 10 hours.

b) The C24 medium grade stone will result in lower
material removal rates. It is utilized for finer finish
grinding of concrete and rough grinding on terrazzo
and other types of stone floor configurations. The
average service life is approximately 6 to 10 hours.

c) The C80 fine grade stone will result in still lower
material removal rates. It is utilized for polishing
concrete and medium grinding on terrazzo and other
types of stone floor configurations with a water/slurry
mixture only. The average service life is approximately
8 to 20 hours.

d) The C120 super fine grade stone will result in the
lowest material removal rates. It is utilized for final
polishing on terrazzo and other types of stone floor
configurations with a water/slurry mixture only. The
average service life is approximately 40 to 75 hours.

Tungsten Carbide Grinding Block

This multi-accessory attachment is most often utilized
on larger concrete grinding projects where increased
production and service life are required. The block
utilizes tungsten carbide balls approximately 1/16 inch
diameter that are deposited in a molten matrix material

during the manufacturing process at a controlled rate.
The end effect is a multi layer deposit of tungsten
carbide balls in the matrix material. As the softer matrix
material wears with use, it exposes a new layer of fresh
tungsten carbide balls to continue the grinding
process. The tungsten carbide grinding block is
considerably more aggressive than the C10 silicon
carbide grinding stone. With the ability to renew itself
during usage, the normal life expectancy for this
accessory can approach several hundred hours. The
nominal dimensions for the tungsten carbide grinding
block is 2" x 2" x 4" and is secured to the machine with
a hardwood wedge, FIGURE 5.

FIGURE 5

Scarifier Blocks

These multi-accessory attachments are comprised of
flails and spacer washers secured in a rigid steel case,
FIGURE 6. Rotation of the two multi-accessory discs
causes the flails to impact against the work surface
with a variety of results. Scarifier blocks are secured to
the machine with hardwood wedges.

Several factors directly affect the selection of a flail
design for a specific job application:

a) The type and amount of material to be removed from
the work surface. Materials of higher yield and tensile
strengths along with the actual volume of material to be
removed will generally be the first factors under
consideration.

b) Purchase cost versus service life. The original
purchase cost of plain, heat treated steel flails must be
compared against the substantially higher costs of the
tungsten carbide insert flails. In turn, these costs must
be compared to anticipated service life. All flails will
eventually wear to the point of requiring replacement.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 16

The amount of unproductive time spent to replace worn
flails on a job can be substantially greater than the
actual replacement cost of many flails. It then becomes
a balance between purchase cost, productivity, service
life and labor cost.

c) Surface finish and texture. The finest grained
surface finish available from the scarifying process is
comparable to a "swept or broomed" like finish. If a
smooth, flat finish is desired, the scarifying process
must be followed with a grinding or polishing type
process. Many job requirements may call for large
amounts of material to be removed, but followed with
additional specifications requiring a finer surface finish
or texture. Many times these jobs dictate the use of an
aggressive flail configuration because of productivity
and cost considerations. Less aggressive flail
configurations can then be utilized for the final finishing
sequence. Generally speaking, the more aggressive
the flail configurations, the more coarse the resulting
finish and texture.

Many flail configurations are available to meet a wide
variety of job applications and surface material
specifications. To give additional perspective to each
configuration, a rating system of 1 to 10 (10 being
highest) has been devised.

FIGURE 6

Star Flail

The star flail is manufactured from high carbon steel
that is thoroughly hardened for additional service life. It
is highly effective for light cleaning or scarifying and
delivers a finer surface finish texture, FIGURE 7.

Suggested applications:

1) Removal of thin coatings and encrusted
accumulations.

2) Cleaning concrete and asphalt surfaces.

3) Removing thick material build-ups of greases,
paints, oils, vegetable powders and some resins from
floors.

4) Light scarifying prior to the application of coatings,
toppings or sealers.

FIGURE 7

COST 1
PRODUCTIVITY 3
SERVICE LIFE 1

The star flail should be replaced when the outside
diameter is worn to approximately 1-5/16 inch or the
inside diameter elongates to approximately 3/4 inch.

Beam Flail

The beam type flail is manufactured from high carbon
steel that is thoroughly hardened for additional service
life. It is highly effective for scabbling or scarifying and
delivers medium to coarse surface finish texture,
FIGURE 8.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 17

FIGURE 8

Suggested applications:

1) Medium duty asphalt and concrete scarifying.

2) Descaling steel decks.

3) Removing thick material build-ups of greases,
paints, oils, vegetable powders and some resins from
floors.

4) Dried, fully cured, carpet and tile adhesive removal.

COST 1
PRODUCTIVITY 5
SERVICE LIFE 2

The beam flail should be replaced when the outside
diameter is worn to approximately 1-5/16 inch or the
inside diameter elongates to approximately 3/4 inch.

Pentagonal Flail

The pentagonal type flail is manufactured from high
carbon steel that is throughly hardened for additional
service life. Each section of the five sided design
features a small, tungsten carbide insert that is held in
position with copper brazing. It is highly effective for
scabbling or scarifying and delivers medium to coarse
finish texture, FIGURE 9.

FIGURE 9

Suggested applications:

1) Heavy duty asphalt and concrete scarifying.

2) Heavy duty descaling of steel decks.

The pentagonal flail is designed for more aggressive
and rapid removal of a surface in comparison to the
beam flail. The addition of the tungsten carbide inserts
contributes to its long service life and higher production
rates. The use of tungsten carbide is also the main
reason for the cost differential between it and the other
flails. The design configuration yields a rather coarse
surface finish and texture. For many job applications,
this finish and texture will be satisfactory. Some
applications may require an additional smoothing
process. If the resulting surface finish is too coarse to
meet specifications, it can be smoothed with the use of
the star or beam flail.

COST 10
PRODUCTIVITY 8
SERVICE LIFE 10

The pentagonal flail should be replaced when two
successive tungsten carbide inserts break off or the
inside diameter elongates to approximately 3/4 inch. In
service, the flail body will wear much faster than the
tungsten carbide inserts. The copper brazing used to
weld the inserts into the body can fail and an insert
break off. The flail can still be used in service. It will just
wear a little faster and more uneven in that particular
area. As a general rule, a pentagonal flail can be
utilized until body wear will no longer support the
tungsten carbide inserts.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 18

Spacer Washer

Spacer washers are stamped from high carbon steel
and heat treated for additional service life, FIGURE

10.

FIGURE 10

Spacer washers serve the following function:

1) Reduces the number of flails required to be mounted
on the scarifier block, thus reducing purchase and
operational costs.

2) Arrange the flails in a sequence or pattern that
minimize "blind" or "open" spots. Normally, at least one
spacer washer is inserted between two consecutive
flails. A scarifier block set up with only star, beam or
pentagonal flails will not penetrate the work surface at
satisfactory rates. This configuration will minimize the
hammering or impact action of the flails.

Variances in material thickness and manufacturing
processes can affect the final thickness of both flails
and spacer washers. Because of this occurrence, trial
and error is important for assembling flails and spacer
washer on the scarifier block. By mixing and matching
flails and spacer washers of specific thicknesses, the
required number of components can be assembled on
a block in a minimum amount of time.

USE ONLY FACTORY SUPPLIED SPACER
WASHERS ON THE SCARIFIER BLOCK. OTHER
WASHER TYPES AND/OR CONFIGURATIONS CAN
PRODUCE ABNORMAL WEAR AND ELONGATION,

RESULTING IN COMPLETE SEPARATION FROM
THE SCARIFIER BLOCK. INADVERTENT SPACER
WASHER SEPARATION CAN LEAD TO PROPERTY
DAMAGE AND/OR PERSONAL INJURY.

Scarifier Block Bushing

Scarifier block bushings are designed to be discarded
whenever the flails are replaced, FIGURE 11. Normal
wear should be uniform about the bushing
circumference.

FIGURE 11

Uneven bushing wear would suggest the following
problems:

1) Inadequate free play exists between the flails/spacer
washers and the scarifier block case. If the flails and
spacer washers do not have complete freedom of
movement, they will not be capable of properly rotating
about the scarifier block bushing. The result is bushing
wear usually confined to two locations that are 180
degrees apart. Variances in flail and spacer washer
thicknesses affect free play when assembled on the
scarifier block. Because free play is also created during
the scarifying process due to actual flail and spacer
washer wear, a certain amount of "tightness" can
sometimes be tolerated without affecting the service
life of the bushings and flails. The specific amount of
"tightness" can usually be determined through trial and
error. If the flails and spacer washers appear too tight
on the scarifier block, remove an appropriate flail or
washer and reassemble the block. If a short,
operational test indicates normal component wear
patterns, the apparent problem has been solved. A
general rule for consideration: it is better to have the
flails and spacer washers a "little too loose than a little
too tight".

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 19

2) Mixing both worn and new flails on the scarifier
block. Proper flail action against the work surface
material requires that the flails be of the same
approximate dimensions. Flails with various inside and
outside dimensions will not impact the work surface
material with the same intensity and deliver the same
results. Flail bushing wear is directly proportional to the
amount of force it must supply against each individual
flail. When a bushing can no longer supply adequate
force against the flails, it will break, allowing the flails to
be hurdled against the inside of the Surface Grinder
frame. The more aggressive flails require greater
forces to keep them contained on the block. These
forces, in turn, create faster and/or uneven bushing
wear rates.

Because scarifier bushings are a critical component of
the actual scarifying process, it is important that each
bushing be inspected on a regular basis to determine
proper structural integrity.

Wire Brushes

Typical applications include light scarifying and
cleaning of concrete, asphalt, steel and tile surfaces.
Wire brushes are secured to the machine with
hardwood wedges, FIGURE 12.

Wire brushes are available in a number of flat wire
sizes and resulting configurations. With continuous
use, the flat wire will take a "set" that can limit
effectiveness and overall productivity, FIGURE 13. For
best results, flat wire brushes should be rotated end for
end in the aluminum multi-accessory discs a minimum
of once for every one hour of operation. External
weight applied to the Surface Grinder will not normally
increase productivity rates and only accelerate flat wire
wear rates.

FIGURE 12

FIGURE 13

Floor Brushes

Eleven inch diameter, silicon carbide impregnated,
floor brushes are available in a number of styles and
designs for general maintenance and cleaning
projects, FIGURE 14. They are especially effective
cleaning soiled concrete floors with the addition of
water soluble solvents. These types of brushes are
directly mounted to the multi-accessory discs with the
included 1/2 inch x 2 inch long Grade 5 cap screws. A
kidney shaped drive plate is provided on the back side
of the brush. This drive plate fits into a recess provided
in the multi-accessory disc, FIGURE 15. To maximize
bristle service life, it is recommended that the silicon
impregnated brushes be rotated between multi­accessory discs a minimum of once for every one hour
of operation.

FIGURE 14

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 20

FIGURE 15

SCRAPE-R-TACH® Industrial Floor Coatings
Removal System

This multi-accessory attachment is designed to
remove many urethanes, epoxies, paints, mastics and
other, similar material accumulations from concrete
floor surfaces, FIGURE 16. Each assembly utilizes two
tungsten carbide inserts set at a precise angle. The
rotating inserts "cut and shave" against the work
surface material with a "scraping" action that removes
materials with highly productive results. To increase
the effectiveness of the inserts, the scraper block
design incorporates a Lord® type rubber mount that
helps absorb damaging shocks while allowing the
inserts to more easily follow local variations in the
surface contour. Units are secured to the machine with
hardwood wedges.

FIGURE 16

The productivity of the product is directly dependent
upon the yield and tensile strength of the material

being removed. Material thickness has also shown to
have a direct effect on overall productivity. For
example, the SCRAPE-R-TACH system is a highly
productive method for removing thick paint
accumulations from factory floors. Production rates of
up to several hundred square feet per hour can be
realized. However, many thin film ( ie: 5 mill thickness
and thinner) urethane coatings present a much more
difficult removal problem. Since removal rates are also
directly affected by applied down force, up to 300 lbs of
external weight can be added to the Surface Grinder to
increase productivity. Cement blocks or stacked bags
of cement make excellent weights and can be secured
with "bungy" cords or other means with the provided
holes in the top cover, FIGURE 17.

FIGURE 17

Each insert provides 8 scraping edges. As an edge
becomes dull and worn, the insert can be turned and
reinstalled to expose a new, sharp edge, FIGURE 18.
When all 4 edges of one side become worn and dull,
the insert can be turned over to expose an additional 4
edges.

Many materials such as adhesives, rubber deposits
and mastics have the tendency to extrude or smear
rather than shear from the concrete floor material. The
occurrence is also aggravated by higher ambient
temperatures. This problem can be significantly
reduced with the addition of various amounts of water
or a water saturated, fine sand combination placed on
the floor. The use of the Part Number SG24-1000
Safety and Dust Shield Assembly with the Surface
Grinder is highly recommended to contain the
water/sand slurry mixture from damaging surrounding
walls and other vertical surfaces, FIGURE 19.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 21

FIGURE 18

FIGURE 19

To index the tungsten carbide insert, proceed as
follows:

Tools required:

1 each, 5/32 Allen wrench
1 each, 7/16 inch wrench

1) Clean the SCRAPE-R-TACH unit with a suitable
safety solvent to remove excess material build-up.
Remove as much foreign material as possible from the
female hexagon socket area of the cap screw. This will
allow the wrench to make full contact and maximize the
torque transfer to the cap screw.

Follow all safety precautions for the safety solvent.

2) Remove the cap screw from the unit. Clean the
newly exposed areas of the insert and SCRAPE-R­TACH unit with the safety solvent. Clean and inspect
the threaded holes found in older units for excess wear.
New style SCRAPE-R-TACH units feature a through
hole design.

3) Index the insert to expose a new edge. Reinstall the
cap screw (lock washer and hexagon nut on new style
units) and apply a torque value that properly seats the
insert firmly against the body of the unit.

An insufficient seating torque value will allow the
insert to become loose from the unit body,
resulting in premature component wear and
improper scraping action. An excessive torque
value will strip the threads of the cap screw or unit
body.

4) Determine that the unit body is free to rotate about
the 5/16 inch diameter cap screw that retains the body
to the unit. A body that does not freely rotate indicates
that a material build-up exists between the rubber
mount and retaining cap screw exits. This build-up
must be removed by disassembling the body from the
unit and cleaning all contact areas with the safety
solvent, FIGURE 20.

The SCRAPE-R-TACH system is designed to be
installed with the edge of the tungsten carbide inserts
facing the direction of rotation. Markings are provided
to indicate proper direction of rotation.

SG24 GRINDER FORM GOM3259601, VERSION 1.2, AUTHORIZATION: DVR, PAGE: 22