Hobart 770730 User manual

4-1/2 In. Angle
Grinder
www.HobartWelders.com
Description
OM-254 206B 2011−11
File: Accessory
Accessory

TABLE OF CONTENTS
GENERAL SAFETY RULES 1.................................................................
SPECIFIC SAFETY RULES 2..................................................................
EXPLANATION OF SYMBOLS 2...............................................................
FEATURES 3................................................................................
ASSEMBLY 3...............................................................................
OPERATION 4...............................................................................
MAINTENANCE 5............................................................................
ACCESSORIES 5............................................................................
SPECIFICATIONS 5..........................................................................
LIMITED WARRANTY 5.......................................................................

OM-254 206 Page 1
GENERAL SAFETY RULES
WARNING!
Please read and understand all instructions. Failure to follow all instructions listed below may result in electric shock, fire and/or serious per-
sonal injury.
SAVE THESE INSTRUCTIONS
Work Area
1Keep your work area clean and well lit. Cluttered benches and dark areas may cause accidents.
2Do not operate power tools in explosive atmospheres such as in the presence of flammable liquids, gases, or dust. Power tools
create sparks which may ignite the dust or fumes.
3Keep bystanders, children, and visitors away while operating a power tool. Distraction can cause you to lose control.
Electrical Safety
1Double Insulated tools are equipped with a polarized plug (one blade is wider than the other.) This plug will fit in a polarized outlet
only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install
a polarized outlet. Do not change the plug in any way. Double insulation eliminates the need for the three wire grounded power cord
and grounded power supply system.
2Avoid body contact with grounded surfaces such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric
shock if your body is grounded.
3Don’t expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
4Do not abuse the cord. Never use the cord to carry the tools or pull the plug from an outlet. Replace damaged cords immediately.
Damaged cords will increase the risk of electric shock.
5When operating a power tool outside, use an outdoor extension marked with “W-A” or “W.” These cords are rated for outdoor use
and reduce the risk of electric shock.
6If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) -protected supply. Use of an RCD
reduces the risk of electric shock.
7Recommendation:Use a residual current device with a rated residual current of 30 mA or less.
Personal Safety
1Stay alert, watch what you are doing, and use common sense when operating a power tool. Do not use the tool while tired or under
the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.
2Dress properly. Do not wear loose clothes or jewelry. Contain long hair. Keep your hair, clothes, and gloves away from moving
parts. Loose clothes, jewelry, or long hair can be caught in moving parts.
3Avoid accidental starting. Be sure switch is off before plugging in. Carrying tools with your finger on the switch or plugging in tools that
have the switch on may invite accidents.
4Remove adjusting keys or wrenches before turning the tool on. A wrench or a key that is left attached to a rotating part of the tool may
result in personal injury.
5Do not overreach. Keep proper footing and balance at all times. Proper footing and balance enable better control of the tool in
unexpected situations.
6Use safety equipment. Always wear eye protection. Dust mask, non-skid safety shoes, hard hat, or hearing protection must be used for
appropriate conditions. Ordinary eye or sun glasses are NOT suitable for eye protection.
Tool Use And Care
1Use clamps or other practical way to secure and support the work piece to a stable platform. Holding the work piece by hand or
against your body is unstable and may lead to loss of control.
2Do not force the tool. Use the correct tool for your application. The correct tool will do the job better and safer at the rate for which it is
designed.
3Do not use the tool if the switch cannot be turned on or off. Any tool that cannot be controlled with the switch is dangerous and must be
repaired before use.
4Disconnect the plug from the power source before making any adjustment, changing accessories, or storing the tool. Such
preventive safety measures can reduce the risk of starting the tool accidentally.
5Store idle tools out of reach of children or other untrained persons. Tools are dangerous in the hands of untrained users.
6Maintain tools with care. Keep the cutting tools sharp and clean. Properly maintained tools with sharp cutting edges are less likely to
bind and are easier to control.
7Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the tools operation.
If damaged, have the tool serviced before using. Many accidents are caused by poorly maintained tools.
8Use only accessories that are recommended by the manufacturer for your model. Accessories that may be suitable for one tool, may
become hazardous when used on another tool.
Service
1Tool service must be performed only by qualified repair personnel. Service or maintenance performed by unqualified personnel could
result in a risk of injury.
2When servicing a tool, use only identical replacement parts. Follow instructions in the Maintenance section of this manual. Use of
unauthorized parts or failure to follow Maintenance Instructions may create a risk of electric shock or injury.

OM-254 206 Page 2
SPECIFIC SAFETY RULES
1Always use proper guard with grinding wheel. A guard protects operator from broken wheel fragments.
2Accessories must be rated for at least the speed recommended on the tool warning label. Wheels and other accessories running over
rated speed can fly apart and cause injury.
3Hold tool by insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own
cord. Contact with a “live” wire will make the exposed metal part of the tool “live” and shock the operator.
4Make sure the grinding wheel is not contacting the work piece before the switch is turned on.
5Grinding wheel and guard must be securely attached as described in this operating manual before connecting the angle grinder to power
source.
6Grinding wheel must be stored in a dry place.
7Always hold the grinder firmly with two hands while working and at all times when it is running.
8Use only quality certified grinding wheels.
9Keep hands away from rotating parts.
10 Be careful not to damage the spindle, outer flange and inner flange. Damage to these parts could result in wheel breakage. When
starting the tool (install with a new or replacement wheel), hold the tool in a well protected area and let it run for one minute to check if the
wheel is good or not. Never start the tool while standing in line with the wheel.
EXPLANATION OF SYMBOLS
In this manual and/or on the machine the following symbols are used:
Class II tools symbol
VVolts
AAmperes
Hz Hertz
Min Minutes
SSeconds
Alternating Current
n0No load speed
Class II construction
…/min Revolutions or reciprocations per minute
Warning symbol

OM-254 206 Page 3
FEATURES
This angle grinder has been designed for professional grinding and cutting applications. Please refer to the figure below to familiarize yourself with the
major components of this tool before using it.
1 Spindle Lock
2 Lock-On Switch
3 Auxiliary Handle
4 Wheel Guard
5 Quick Release Lever
6 Outer Flange
6
32
1
5
ASSEMBLY
Prior to assembly and adjustment always unplug the tool.
Installing The Grinding Wheel
1 Depress and hold down the spindle lock. To prevent damage to spindle or spindle lock, always allow motor to come to a complete stop before
engaging spindle lock.
2 Remove the outer flange with spanner turning in anti-clockwise direction. Do not remove the inner flange.
3 Make sure the slot on the inner flange is engaged with the square neck of the spindle.
4 Place the grinding wheel over the spindle with the depressed center against the inner flange.
5 Depress and hold down the spindle lock again, mount the outer flange, and securely tighten it with spanner provided clockwise. Do not over
tighten it.
Mounting The Auxiliary Handle
The tool has three screwed holes on top, left and right side of the gear housing. Operators can choose any one of them to mount the auxiliary handle
dependingon specific working condition and their own habit.
Adjusting The Wheel Guard
This tool is fitted with a wheel guard. The closed segment of the guard can be adjusted to different angles.
1 Pull the quick release lever toward outside so as to enlarge the circular collar of wheel guard.
2 Turn the wheel guard to a desired angle.Pull back the quick release lever to lock the guard.
3 Make sure the guard is firmly secured in place. If the guard is too loose after pulling back the quick release lever, pull up the lever, properly
adjust the nut on the guard and pull back the lever again.

OM-254 206 Page 4
OPERATION
This heavy duty grinder is designed for the following purposes:
1 Removal of casting burrs and finishing on various types of steel, bronze, aluminum materials and castings.
2 Beveling and finishing weld seams
3 Grinding of welded sections cut by means of welding.
4 Grinding of synthetic resin bricks, marbles etc.
5 Cutting thin wall tubes and small size metal materials.
CAUTION! Never cover air vents.They must always be open for proper motor cooling.
To Start Your Grinder:
1 Plug the cord set into a power socket;
2 The grinder will be turned on when the on/off switch is pushed forward to the end.
3 For continuous operation, press at the front end of the switch button to make it engage in the “on” position.
To stop your grinder:
1 Release the on/off switch, or press at the end of the switch button to make it spring back when the switch is engaged in the lock-on position.
For Proper Operations
1 Before starting the grinder, put on safety glasses and make sure that the grinding wheel, guard and the tool are in good condition and
correctly fitted.
2 Always hold the tool firmly with one hand on the rear handle and the other on the side handle.
3 Turn the angle grinder on and then apply the grinding wheel to the workpiece.
4 In general, keep the edge of the wheel at an angle of about 30_for roughing and about 15_for finishing.
5 Move the grinder back and forth or up and down over the work area.
6 Use just enough pressure to keep the grinder from chattering or bouncing.
7 Avoid overloading the tool for a long time, heavy pressure will decrease its speed and put a strain on the motor .
8 Lift the grinder away from the workpiece before turning your grinder off.
WARNING!
Never use your grinder without wearing eye protection. Following this rule will reduce the risk of serious personal injury.
DANGER!
1 Never attach a wood cutting or carving blade of any type to this angle grinder.
2 Never use your grinder with guard removed.
3 Failure to follow this rule could result in serious personal injury.
WARNING!
If any of the following events occurs during normal operation, the power supply should be shut off immediately and then the tool should be inspected
thoroughly and repaired by a qualified person if necessary:
1 The rotating parts get stuck or speed drops abnormally low.
2 The tool shakes abnormally and accompanied by some unusual noise.
3 The motor housing gets abnormally hot.
4 Heavy sparks occurring around the motor area.

OM-254 206 Page 5
MAINTENANCE
WARNING !
Maintenanceand repair work should only be done by a qualified service technician. When servicing a tool, it is recommended to use only spare
parts provided by the manufacturer of the tool.
Preventive maintenance performed by unauthorized personnel may result in misplacing of internal wires and components which could cause
serious hazard.
CAUTION !
Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance.
Regularly clean the tool’s air vents with compressed dry air. Do not attempt to clean by inserting pointed objects through openings.
CAUTION!
Certain cleaning agents and solvents may damage plastic parts. Some of these are: gasoline, carbon tetrachloride, chlorinated cleaning solvents,
ammonia and household detergents that contain ammonia.
To ensure safe use and maximize service life of your tool, the following instructions should be observed:
1 Regularly inspect the grinding wheel----ensure that the grinding wheel is free of cracks and surface defects. Replace the grinding wheel when
it has worn out.
2 Periodically check the mounting screws—regularly inspect all mounting screws and ensure that they are properly tightened.
3 Regularly clean the air vents of the tool.
4 Check and replace carbon brushes when necessary. When it’s necessary, peel off the labels on both sides of the tool. Remove the carbon
brush caps with screwdriver. Pull out the carbon brushes for inspection. If the brushes are worn out, they should be replaced with a new pair
of brushes. Note that the brushes must be replaced in pair. Make sure the brush can slide freely inside the brush holder. Put back the brush
caps and tighten them with screws. Be careful not to over tighten the screws.
ACCESSORIES
SSpanner 1pc..................
SSide handle 1pc...............
SCarbon brush 1pair.............
SInstruction manual 1pc.........
SPECIFICATIONS
Model: 770730
Voltage: 120V@ 60Hz
Rated Power: 7.5A
Wheel Size: 115mm
No Load Speed: 10,500/min
LIMITED WARRANTY
LIMITED WARRANTY – Subject to the terms and conditions below.
Hobart warrants to its original retail purchaser that the new Hobart equip-
ment sold after the effective date of this 1 year limited warranty is free of
defects in material and workmanship at the time it is shipped by Hobart.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRAN-
TIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OR
MERCHANTABILITY AND FITNESS.
Proof of purchase is required for warranty transactions so it is imperative
that a copy of the original invoice or sales receipt be retained.
For warranty transactions, contact your Hobart Distributor.
Effective November 1, 2011

Resources Available
Always provide Model Name and Serial/Style Number.
To locate a Service Center:
Call 1-800-332-3281
or visit our website at www.HobartWelders.com/wheretobuy
For Technical Assistance:
Call 1-800-332-3281
7 AM to 5 PM EST −Monday through Friday
ORIGINAL INSTRUCTIONS −PRINTED IN USA ©2011 Hobart Welding Products. 2011−01
Hobart Welding Products
An Illinois Tool Works Company
600 West Main Street
Troy, OH 45373 USA
For Assistance:
Call1-800-332-3281
Model Name Serial/Style Number
Purchase Date (Date which equipment was delivered to original customer.)
Distributor
Address
City
State Zip
Please complete and retain with your personal records.
Owner’s Record
Thank you for purchasing Hobart. Our trained technical support team is
dedicated to your satisfaction. For questions regarding performance, op-
eration, or service, contact us!