Multiquip Grinder DFG Series User Manual

OPERATION AND PARTS MANUAL  
ElectricandGasoline  
SurfaceGrinders  
Model DFG Series  
Revision #4 (05/28/09)  
To find the latest revision of this  
publication, visit our website at:  
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES  
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TABLE OF CONTENTS  
MULTIQUIP DFG SERIES SURFACE GRINDERS  
Table Of Contents.................................................................................................................................3-4  
Parts Ordering Procedures...................................................................................................................6  
Notice to Operators...............................................................................................................................7-8  
Operator Instructional Data Sheet ........................................................................................................9  
Safety Precautions................................................................................................................................10  
Preparation ........................................................................................................................................10-11  
Operation ...........................................................................................................................................12-13  
Maintenance, Repair and Storage.....................................................................................................13-14  
Assembly ..............................................................................................................................................15  
Removing the SURFACE GRINDER from the Pallet ........................................................................15  
Installing the SSG24-1000 Safety and Dust Shield Assembly Kit.....................................................16  
Before Starting the Engine....................................................................................................................17  
Filling the Engine Crankcase with Oil................................................................................................17  
Filling the DFG/G Series Engine Fuel Tank ......................................................................................17  
Assembly Instructions/Operation..........................................................................................................18  
Theory of Operation...........................................................................................................................18  
Multi-Accessory Attachments and Applications.................................................................................19-26  
Installing a Multi-Accessory Attachment (not including multi-segmented, dry diamond discs)  
in the counter-rotating discs...............................................................................................................26-27  
Removing a Multi-Accessory Attachment (not including multi-segmented, dry diamond discs)  
from the counter-rotating discs..........................................................................................................28-29  
Transporting the Surface Grinder......................................................................................................29  
Adjusting the Operator Handle Height...............................................................................................30  
Starting the DFG/E Series Electrically Powered Surface Grinder On the Job Site...........................30-32  
Starting the DFG/G Series Gasoline Powered Surface Grinder On the Job Site .............................32-33  
Operating the Surface Grinder on the Job Site .................................................................................33-36  
Stopping the DFG/E Electrically Powered Surface Grinder ..............................................................36  
Stopping the DFG/G Gasoline Powered Surface Grinder.................................................................36  
Operational Parameters and Techniques for DFG Series Surface Grinder’s ...................................36-39  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV. #4 (05/28/09)  
PAGE 3  
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TABLE OF CONTENTS  
Maintenance/Service ............................................................................................................................40  
Preventative Maintenance Check List ...............................................................................................40  
Checking V-Belt Tension and Alignment...........................................................................................40  
Installing a Replacement V-Belt or Centrifugal Clutch or Pulley .......................................................41-43  
Replacing the LORD® Type Elastomeric Mounts on the Multi-Accessory Discs..............................44  
Lubrication Requirements..................................................................................................................45  
Electric Motor Service........................................................................................................................46  
Engine Service...................................................................................................................................46  
Troubleshooting ....................................................................................................................................47  
Electric Motor.....................................................................................................................................47  
Gasoline Engine....................................................................................................................................47-48  
Storage .................................................................................................................................................49  
Specifications........................................................................................................................................50  
Explanation of Code In Remarks Column ............................................................................................52  
Suggested Spare Parts.........................................................................................................................53  
Component Parts Drawings  
Operator Handle Assembly (Electric) ................................................................................................54-55  
Operator Handle Assembly (Gasoline)..............................................................................................56-57  
Electric Motor Assembly ....................................................................................................................58-59  
Gasoline Engine Assembly................................................................................................................60-61  
Wheel Assembly................................................................................................................................62-63  
Transmission Assembly.....................................................................................................................64-65  
Head Assembly..................................................................................................................................66-67  
Safety and Shield Assembly..............................................................................................................68-69  
Scarifier Assembly.............................................................................................................................70-71  
SCRAPE-R-TACH .............................................................................................................................72-73  
Grinder Block Assembly ....................................................................................................................74-75  
Decals................................................................................................................................................76-77  
Terms and Condition of Sale —Parts................................................................................................78  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV. #4 (05/28/09)  
PAGE 4  
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NOTE PAGE  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV. #4 (05/28/09)  
PAGE 5  
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PARTS ORDERING PROCEDURES  
Ordering parts has never been easier!  
Choose from three easy options:  
Effective:  
January 1st, 2006  
Best Deal!  
Order via Internet (Dealers Only)  
Order parts on-line using Multiquip’s SmartEquip website!  
:
If you have an MQ Account, to obtain a Username  
and Password, E-mail us at: parts@multiquip.  
com.  
View Parts Diagrams  
Order Parts  
Print Specification Information  
To obtain an MQ Account, contact your  
District Sales Manager for more information.  
Use the internet and qualify for a 5% Discount  
on Standard orders for all orders which include  
complete part numbers.*  
Goto www.multiquip.com and click on  
to log in and save!  
Order Parts  
Note: Discounts Are Subject To Change  
Fax your order in and qualify for a 2% Discount  
on Standard orders for all orders which include  
complete part numbers.*  
Order via Fax (Dealers Only)  
:
All customers are welcome to order parts via Fax.  
Domestic (US) Customers dial:  
1-800-6-PARTS-7 (800-672-7877)  
Note: Discounts Are Subject To Change  
Domestic (US) Dealers Call:  
Order via Phone:  
1-800-427-1244  
Non-Dealer Customers:  
International Customers should contact  
their local Multiquip Representatives for  
Parts Ordering information.  
Contact your local Multiquip Dealer for  
parts or call 800-427-1244 for help in  
locating a dealer near you.  
When ordering parts, please supply:  
Dealer Account Number  
Specify Preferred Method of Shipment:  
Dealer Name and Address  
UPS/Fed Ex  
DHL  
Truck  
Priority One  
Ground  
Shipping Address (if different than billing address)  
Return Fax Number  
Next Day  
Second/Third Day  
Applicable Model Number  
Quantity, Part Number and Description of Each Part  
NOTICE  
All orders are treated as Standard Orders and will  
ship the same day if received prior to 3PM PST.  
WE ACCEPT ALL MAJOR CREDIT CARDS!  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV. #4 (05/28/09)  
PAGE 6  
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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.  
DANGER  
CAUTION  
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 Manual and  
becoming familiar with its operation. The manufacturer of the 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  
removing covering materials from concrete and wood 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 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.  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV. #4 (05/28/09)  
PAGE 7  
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NOTICE TO OPERATORS  
CAUTION  
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 marketplaces. 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 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 electric motor serial numbers in the spaces provided below.  
_______________ Model Number  
_______________ Serial Number  
_______________ 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. Multiquip, Inc. 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. Multiquip, Inc. and its agents accept no responsibility for variations which maybe evident in  
actual products, specifications, pictures and descriptions contained in this publication.  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV. #4 (05/28/09)  
PAGE 8  
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OPERATOR INSTRUCTIONAL DATA SHEET  
The following undersigned operators of the SURFACE GRINDER described and/or pertaining to this Operator  
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 MANUAL AND APPLICABLE SAFETY AND  
OPERATIONAL INFORMATION VIDEO TAPE FOR THE SURFACE GRINDER.  
2) FORMALIZED OPERATOR SAFETY PROGRAM TO BE DEVISED BY THE OWNER OF THE SURFACE  
GRINDER IN CONJUNCTION WITH THE CONTENTS OF THE APPLICABLE OPERATOR MANUAL AND  
THE APPLICABLE SAFETY AND OPERATIONAL INFORMATION VIDEO TAPE FOR THE SURFACE  
GRINDER AND THE APPLICABLE MATERIAL INCLUDED IN THE NATIONAL ELECTRICAL 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 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  
_______________ Operator  
_______________ Operator  
_______________ Operator  
_______________ Operator  
_______________ Operator  
_______________ Owner/Instructor  
_______________ Owner/Instructor  
_______________ Owner/Instructor  
_______________ Owner/Instructor  
_______________ Owner/Instructor  
_______________ Owner/Instructor  
__________ Date  
__________ Date  
__________ Date  
__________ Date  
__________ Date  
__________ Date  
NOTE: INSERT COPIES OF THIS PAGE WITHIN THE OPERATOR'S MANUAL IF SPACE FOR ADDITIONAL  
OPERATORS IS REQUIRED.  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV. #4 (05/28/09)  
PAGE 9  
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SAFETY PRECAUTIONS  
the necessary time to read this Operator's  
Manual before operating the SURFACE  
GRINDER. DO NOT OPERATE THE SURFACE  
DANGER  
THE FOLLOWING SAFETY PRECAUTIONS  
PROVIDE SOME COMMON SENSE GUIDES TO  
PROMOTE SAFETY AND EFFICIENCY WITH THE  
GRINDER  
COMPLETELY  
UNTIL  
EACH  
OPERATOR  
THE  
COMPREHENDS  
CONTENTS OF THIS MANUAL AND THE  
APPLICABLE SAFETY AND OPERATIONAL  
INFORMATION VIDEO TAPE.  
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  
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.  
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.  
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.  
DANGER  
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.  
DANGER  
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  
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.  
HAND  
AND  
FOLLOW  
THESE  
SAFETY  
PRECAUTIONS:  
PREPARATION.  
1) This SURFACE GRINDER is 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  
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  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV #4 (05/28/09)  
PAGE 10  
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SAFETY PRECAUTIONS  
GRINDER. Guide against the possibility of back  
related injuries. Always lift the SURFACE  
GRINDER with leg muscles and not with the  
back.  
e) Inspect the multi-accessory discs and  
gimbal head assemblies for excessive wear  
and structural integrity. Replace each  
component as necessary. The multi-  
accessory 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.  
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.  
Anti-vibration 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.  
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.  
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, non-slip  
gloves to improve your grip. Good footing is  
most important when operating the SURFACE  
GRINDER. Wear sturdy boots with non-slip  
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.  
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 DFG20E or DFG30E electrically  
powered SURFACE GRINDER motors 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 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.  
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 mainframe area.  
d) Inspect the V-belt drive for proper tension,  
wear and general condition. Replace each  
component as necessary.  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV #4 (05/28/09)  
PAGE 11  
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SAFETY PRECAUTIONS  
12. When operating the DFG20E or DFG30E  
electrically powered SURFACE GRINDERs on a  
surface containing water or other electrically  
conducting liquid, special precautions must be  
taken to minimize the possibility of operator  
electrocution. Once 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.  
2) This SURFACE GRINDER is not sealed or  
insulated. Do not operate the SURFACE  
GRINDER in an explosive atmosphere or near  
®
combustible materials. Refer to current OSHA  
rules and regulations.  
3) Gasoline is an extremely flammable fuel. Use  
extreme caution when handling gasoline or  
mixing fuel. Always utilize UL®, CSA® OR CE  
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.  
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.  
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.  
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 sections of this manual for more  
detailed information  
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.  
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.  
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.  
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.  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV #4 (05/28/09)  
PAGE 12  
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SAFETY PRECAUTIONS  
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 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.  
operator  
experience/skill/common  
recommendations for this SURFACE GRINDER  
BEFORE utilization. There is no charge for this  
service.  
sense  
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 or electric motor and  
disconnect the spark plug wire or power source  
cable BEFORE checking or working on the  
SURFACE GRINDER.  
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.  
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.  
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.  
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 it  
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.  
11) Clean and remove all accumulated foreign  
matter from inside the mainframe 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  
6) Do not operate the SURFACE GRINDER  
without the use of factory approved V-belt and  
diamond blade guards that are maintained in  
proper structural condition. Frequently inspect  
the guards for signs of wear, cracks and other  
signs of fatigue.  
regarding the structural integrity and/or condition  
If there is any question  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV #4 (05/28/09)  
PAGE 13  
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SAFETY PRECAUTIONS  
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.  
8) The SURFACE GRINDER utilizes many self-  
locking type hexagon head nuts to minimize the  
effects of vibration. Replace all self-locking  
hardware with genuine, factory approved,  
replacement parts only.  
9) Consult the material supplied by the engine or  
electric motor manufacturer for specific  
information relative to proper operational,  
lubrication and storage requirements.  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV #4 (05/28/09)  
PAGE 14  
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ASSEMBLY INSTRUCTIONS/OPERATIONS  
and Dust Shield Assembly Kit included as a  
standard accessory. The kit is included in a separate  
Assembly  
The DFG 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.  
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 DFG-1000 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 grinding process. This  
includes materials removed from the surface as  
well as any slurry mixture utilized to help  
maximize material removal efficiencies.  
REMOVING THE SURFACE GRINDER FROM THE  
PALLET.  
Application: All Models  
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 the grinding  
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 diameter vacuum attachment fitting located  
at the rear of the machine. Use of the kit along  
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.  
with  
a
suitable vacuum system will not  
DANGER  
WEAR SAFETY GLASSES AND OTHER  
APPROPRIATE SAFETY APPAREL WHEN  
CUTTING THE STEEL BANDING AND/OR  
completely remove all airborne and loose  
materials directly from the work surface.  
DANGER  
THE USE OF THE SG24-1000 SAFETY AND DUST  
SHIELD ASSEMBLY KIT ALONG WITH  
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.  
REMOVING  
THE  
CORRUGATED/WOOD  
SHIPPING CRATE.  
A
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.  
DANGER  
USE OF THE SG24-1000 SAFETY AND DUST  
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.  
SHIELD ASSEMBLY KIT ALONG WITH  
SUITABLE VACUUM SYSTEM WILL NOT  
COMPLETELY REMOVE ALL LOOSE  
MATERIALS FROM THE WORK SURFACE.  
HAZARDOUS CLASSIFIED, LOOSE MATERIALS  
MUST BE REMOVED FROM THE WORK  
A
Check all fasteners for proper security. Consult a  
fastener torque chart for the proper torque value if  
any fastener is found to require retorquing.  
SURFACE  
BY  
PROCESSES  
AND/OR  
PROCEDURES MEETING THE APPLICABLE  
OSHA AND/OR EPA REQUIREMENTS.  
After April 1, 1996 all SURFACE GRINDERS are  
shipped from the factory with the SG24-1000 Safety  
DFG-SERIES SURFACE GRINDERS  
OPERATION AND PARTS MANUAL REV #4 (05/28/09)  
PAGE 15  
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