Harbor Freight Tools Grinder 46388 User Manual

®
4” AIR ANGLE GRINDER  
46388  
ASSEMBLY AND OPERATING INSTRUCTIONS  
®
3491 Mission Oaks Blvd., Camarillo, CA 93011  
Copyright © 2001 by Harbor Freight Tools®. All rights reserved. No portion of this  
manual or any artwork contained herein may be reproduced in any shape or form  
without the express written consent of Harbor Freight Tools.  
For technical questions and replacement parts, please call 1-800-444-3353  
 
6. Use the right tool for the job. Do not attempt to force a small tool or  
attachment to do the work of a larger industrial tool. There are certain  
applications for which this tool was designed. Do not modify this tool and do  
not use this tool for a purpose for which it was not intended.  
7. Dress properly. Do not wear loose clothing or jewelry as they can be caught  
in moving parts. Protective, electrically non-conductive clothes and non-skid  
footwear are recommended when working. Wear restrictive hair covering to  
contain long hair.  
8. Use eye and ear protection. Always wear ANSI approved impact safety  
goggles. Wear a full face shield if you are producing metal filings or wood  
chips. Wear an ANSI approved dust mask or respirator when working around  
metal, wood, and chemical dusts and mists.  
9. Do not overreach. Keep proper footing and balance at all times. Do not  
reach over or across running machines.  
10. Maintain tools with care. Keep tools sharp and clean for better and safer  
performance. Follow instructions for changing accessories. Inspect tool  
cords periodically and, if damaged, have them repaired by an authorized  
technician. The handles must be kept clean, dry, and free from oil and  
grease at all times.  
11. Disconnect when not in use. Disconnect tool from air compressor hose  
when not in use.  
12. Remove adjusting keys and wrenches. Check that keys and adjusting  
wrenches are removed from the tool or machine work surface before plugging  
it in.  
13. Avoid unintentional starting. Be sure the switch is in the Off position when  
not in use and before plugging in.  
14. Stay alert. Watch what you are doing, use common sense. Do not operate  
any tool when you are tired.  
15. Take caution as some woods contain preservatives such as copper  
chromium arsenate (CCA) which can be toxic. When working with these  
materials extra care should be taken to avoid inhalation and minimize skin  
contact.  
16. Check for damaged parts. Before using any tool, any part that appears  
damaged should be carefully checked to determine that it will operate  
properly and perform its intended function. Check for alignment and binding  
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of moving parts, and any other condition that may affect proper operation.  
Any part that is damaged should be properly repaired or replaced by a  
qualified technician. Do not use the tool if any switch does not turn On and  
Off properly.  
17. Guard against electric shock. Prevent body contact with grounded  
surfaces such as pipes, radiators, ranges, and refrigerator enclosures.  
18. Replacement parts and accessories. When servicing, use only identical  
replacement parts. Use of any other parts will void the warranty. Only use  
accessories intended for use with this tool. Approved accessories are  
available from Harbor Freight Tools.  
19. Do not operate tool if under the influence of alcohol or drugs. Read  
warning labels on prescriptions to determine if your judgment or reflexes are  
impaired while taking drugs. If there is any doubt, do not operate the tool.  
20. Use proper size and type extension cord. If an extension cord is required,  
it must be of the proper size and type to supply the correct current to the tool  
without heating up. Otherwise, the extension cord could melt and catch fire, or  
cause electrical damage to the tool. This tool requires use of an extension  
cord of 0 to 10 amps capability (up to 50 feet), with wire size rated at 18  
AWG. Longer extension cords require larger size wire. If you are using the  
tool outdoors, use an extension cord rated for outdoor use. (signified by “WA”  
on the jacket).  
21. Maintenance. For your safety, service and maintenance should be  
performed regularly by a qualified technician.  
Note: Performance of this tool (if powered by line voltage) may vary depending on  
variations in local line voltage. Extension cord usage may also affect tool perfor-  
mance.  
Warning: People with pacemakers should consult with their physician(s)  
before using this product; operation of equipment in close proximity to a heart  
pacemaker could cause interference or failure of the pacemaker.  
Warning: The warnings, cautions, and instructions discussed in this instruc-  
tion manual cannot cover all possible conditions and situations that may oc-  
cur. It must be understood by the operator that common sense and caution  
are factors which cannot be built into this product, but must be supplied by  
the operator.  
Special Warnings for This Tool  
1. There are certain applications for which this tool was designed. Harbor  
Freight Tools strongly recommends that this tool not be modified and/or used  
for any application other than which it was designed.  
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2. All accessories must be rated for at least the RPM speed recommended on  
the tool's warning label. Wheels and other accessories running over rated  
speed can fly apart and cause injury.  
3. For safest operation, it is recommended that only these accessories be used  
with this product: Abrasive Cut-Off Discs and Wheels, Flap Wheels, Wire  
Brushes, Wire Wheel Brushes.  
4. Always use an approved and proper guard when using the above mentioned  
accessories. Each accessory must have the correct arbor size and must fit  
properly on the Gear Shaft. Make sure accessories are tightened down  
securely.  
5. Always disconnect from power source before adding or removing  
accessories. Use a cloth or glove to protect hands from abrasion.  
6. The Handle must be used at all times to maintain complete control of the  
tool.  
Caution: Never install a carbide tipped or steel circular saw blade for use  
with this Angle Grinder. Never install a wood carving blade, carving disc with  
saw chain cutters, or a cutting carving disc on this Angle Grinder.  
Unpacking  
When unpacking, check to make all parts listed on Page 8 are included. If any  
parts are missing or broken, please call Harbor Freight Tools at the number on  
the cover of this manual.  
Air Connection  
Note: Air Compressor is not supplied. You will need an Air Compressor with a  
minimum rating of One Horsepower, 4 CFM delivery at 90 PSI, and a 12 Gallon  
Air Tank.  
You may use Couplings (not supplied) as shown in the Diagram above. Do not  
connect Couplers directly to the Air Inlet. Doing so will increase the overall bulk of  
the tool and strain the Inlet Threads.  
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1. Be sure to follow all safety precautions as listed on Pages 2-5 of this manual.  
2. Acquire a Union fitting (not supplied) and screw into the Air Inlet fitting.  
Tighten with a wrench.  
3. Attach a quick-coupler (not supplied) to the Union fitting if desired. This  
allows quick exchange of the Air Hose to other air tools.  
4. Connect the Air Hose to the Air Inlet Coupling.  
This air tool requires lubrication during operation. For best results, it is recom-  
mended to have an oiler and water filter in line with the air supply as shown. This  
will extend the life of the tool.  
Attaching/Changing the  
Wheel Accessory  
1. Fit the U-shaped end of the  
Stop Spanner [33] around  
the Gear Shaft [6] and hold  
in place to prevent the  
Shaft from spinning. Insert  
the two prongs on the end  
of the Disc Spanner [34]  
into the corresponding  
holes in the Disc Nut [1] and turn your wrist to unscrew the Disc Nut. See Fig.  
Fig. A  
A, right.  
2. Slide the Disc Wheel [2] onto the Shaft.  
3. Replace the Disc Nut and tighten using the Stop Spanner and Disc Spanner.  
DANGER Grinding wheel used must be rated at 11,000 RPM or  
higher.  
Operation  
1. Always wear ANSI approved impact safety goggles when using this tool.  
2. Tighten all work pieces to your work surface with a clamp or vise so that both  
of your hands are free to operate the Grinder.  
3. Screw the Handle [35] into the threaded inlet on the side of the Angle  
Housing [13] as shown in the Assembly Diagram on Page 8.  
4. Set the Air Compressor’s pressure regulator to 90 PSI. Connect the Grinder  
to the Air Compressor’s hose.  
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5. Check to be sure all attachments are secure before turning on the tool. Adjust  
the Wheel Guard so that it provides a shield between you (the user) and the  
material you are working on. The Wheel Guard must be in place at all  
times when using the Angle Grinder.  
6. Grip the Handle with your left hand and the Housing [25] with your right.  
Depress the Trigger [31] with your right hand to turn the tool on. Allow the  
motor to reach its full speed before grinding. Make sure the Wheel is  
rotating evenly and all parts appear to be working properly. Always maintain  
a firm grip with both hands when operating this tool.  
7. To begin cutting or grinding, approach the material at an angle between 15  
and 30 degrees to the Wheel. Maintain that angle until you are finished  
cutting/grinding. Do not force the Wheel or apply too much pressure. If the  
Wheel slows down as you work with your material, you are applying too  
much pressure.  
8. Once you have turned the Grinder off, continue to hold onto the tool with  
both hands until the motor stops completely before you set it down.  
PLEASE READ THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM  
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER  
NOR DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO  
THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE  
PRODUCT OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE  
PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY  
STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN  
BY CERTIFIED AND LICENSED TECHNICIANS AND NOT BY THE BUYER. THE BUYER  
ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE  
ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS  
OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.  
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Page 7  
 
Assembly Drawing  
NOTE: Some parts are listed and  
shown for illustration purposes only  
and are not available individually as  
replacement parts.  
Parts List  
ITEM  
1
2
3
4
5
6
7
8
DESCRIPTION  
Disc Nut  
Disc Wheel  
Screw  
Spring Washer  
Disc Cover  
Gear Shaft  
Key  
Ball Bearing  
Bevel Gear  
Retaining Ring  
Ball Bearing  
Spacer  
Angle Housing  
Screw  
Screw  
Packing  
Pinion Gear  
Front Plate  
QTY  
2
ITEM  
19  
DESCRIPTION  
Bearing Spacer  
Rotor  
Rotor Blade  
Cylinder  
Steel Ball  
Bear Plate  
Housing  
Air Inlet  
Screw  
Spring  
Valve Stem Bushing  
Valve Stem  
Lever  
Spring Pin  
Stop Spanner  
Disc Spanner  
Handle  
QTY  
1
1
4
8
1
1
1
1
1
1
4
1
1
1
4
1
1
1
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
SKU 46388  
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