4" AIR ANGLE GRINDER
ASSEMBLY and OPERATING INSTRUCTIONS
®
3491 Mission Oaks Blvd. / Camarillo, CA 93011
Copyright © 1997 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.
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12. REMOVE ADJUSTING KEYS AND WRENCHES. Make it a habit to check that keys and
adjusting wrenches are removed from the tool or machine work surface before plugging it in.
13. AVOID UNINTENTIONAL STARTING. Do not carry any tool with your finger on the trigger,
whether it is connected to the compressor or not.
14. STAY ALERT. Watch what you are doing; use common sense. Do not operate any tool when
you are tired.
15. CHECK 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 of moving parts; any broken parts or mounting
fixtures; 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.
16. REPLACEMENT PARTS AND ACCESSORIES. When servicing, use only identical replace-
ment 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.
17. 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.
18. DRAIN COMPRESSOR EVERY DAY. Do not allow moisture to build up inside the compres-
sor. Do not allow compressor to sit pressurized for longer than one hour.
19. MAKE SURE ALL EQUIPMENT IS RATED TO THE APPROPRIATE CAPACITY. Make
sure that regulator is set at least 10 PSI lower than the lowest rated piece of equipment you
are using.
UNPACKING
When unpacking your Air Angle Grinder, check the items against the list below. If any parts are
missing or broken, please call Harbor Freight Tools at the number on the cover of this manual.
Item#
N/A
47
Description
Angle Grinder Assembly
Handle
Qty
1
1
48
Wrench (A)
1
49
Wrench (B)
1
45
Grinding Wheel
1
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ASSEMBLY
Step 1: Thread the HANDLE (#47) into the side of the Angle Grinder as shown in Figure 1.
Tighten.
Angle Grinder Assembly
Handle (#47)
Figure 1 — Handle Assembly
Step 2: Remove the FLANGE NUT (#46) from the ARBOR (#4).
Warning:
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.
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.
For safest operation, it is recommended that only these accessories be used with this
product:
Abrasive Cut-Off Discs and Wheels
Wire Brushes
Flap Wheels
Wire Wheel Brushes
Always use an approved and proper guard when using the above mentioned acces-
sories. Each accessory must have the correct arbor size and must fit properly on
the shoulder bushing. Make sure accessories are tightened down securely.
CAUTION: NEVER INSTALL A CARBIDE TIPPED OR STEEL CIRCULAR SAW
BLADE FOR USE ON THIS ANGLE GRINDER. NEVER INSTALL A WOOD CARVING
BLADE, CARVING DISC WITH SAW CHAIN CUTTERS, OR A CUTTING CARVING
DISC ON THIS ANGLE GRINDER.
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REV 05/03
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Step 3: Place the GRINDING WHEEL (#45) onto the ARBOR with the Label side of the
GRINDING WHEEL against the FLANGE (#43) as shown in Figure 2.
Angle Grinder Assembly
Flange (#43)
Grinding Wheel (#45)
Grinding Wheel Label
Figure 2 — Attaching the Grinding Wheel
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Step 4: Thread the FLANGE NUT (#46) onto the ARBOR. Tighten by hand.
Step 5: Place the WRENCH (#48) onto the flats of the ARBOR. You may have to turn the
ARBOR slightly to fit the WRENCH on.
Step 6: Insert the prongs of the WRENCH (#49) into the two holes in the FLANGE NUT as
shown in Figure 3.
Wrench (#48)
Grinding Wheel (#45)
Flange Nut (#46)
Wrench (#49)
Figure 3 — Securing the Grinding Wheel
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Step 7: Hold the flat WRENCH (#48) while tightening the angled WRENCH (#49) to tighten
the Flange Nut as shown in Figure 4.
Wrench (#48)
Grinding Wheel (#45)
Wrench (#49)
Figure 4 — Tightening the Flange Nut
Step 8: Remove the WRENCHES.
Air Connection
Step 1: You will need a Union fitting (sold separately) before you can connect your Angle
Grinder to an air compressor.
Step 2: Attach the Union fitting to the Angle Grinder and tighten.
Step 3: Attach an Air Coupler (sold separately) to the Union fitting if desired. This is a useful
accessory as it allows quick-coupling action when using a variety of tools with the
same air compressor.
Your Angle Grinder is ready for use.
OPERATION
Setup
Frequent, but not excessive, lubrication is required for best performance. Oil added through the
airline connection will lubricate internal parts. An automatic airline oiler is recommended but oil
may be added manually before every operation or after about 1 hour of continuous use. Only a few
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drops of oil at a time are necessary. Too much oil will collect inside the tool and be blown out
during the exhaust cycle. ONLY USE PNEUMATIC TOOL OIL. Do not use detergent oil or
additives as these lubricants will cause accelerated wear to the seals in the tool.
Dirt and water in the air supply are major causes of pneumatic tool wear. Use a filter/oiler for
better performance and longer life. The filter must have adequate flow capacity for the specific
application. Consult the manufacturer’s instructions for proper maintenance of your filter.
The connector on the tool must not hold pressure when the air supply is disconnected. If the
wrong fitting is used, the tool can remain charged with air after being disconnected and still be
able to drive a fastener. See Figure 5 for the recommended accessories and connection order.
Angle
Grinder
Figure 5 — Airline Oiler Assembly
Use
Step 1: Set the compressor’s pressure regulator to 90 PSI. Do not set the compressor’s outlet
regulator over 90 PSI.
Step 2: Connect the Angle Grinder to the air compressor’s hose. If leaking is detected, discon-
nect the air hose and repair before use.
Step 3: Identify the area you wish to grind. If possible, mark or scribe the area to ensure you
grind accurately.
Step 4: If possible, place the grinding material into a vise or otherwise secure the material so it
will not move.
Step 5: Grip the Angle Grinder with both hands. Make sure you are wearing eye protection and
protective gloves before using the Angle Grinder.
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Step 6: To operate the Angle Grinder, press the THROTTLE LEVER LOCK (#61) forward while
depressing the THROTTLE LEVER (#59) as shown in Figure 6.
Throttle Lever (#59)
Throttle Lever Lock (#61)
Figure 6 — Operating the Angle Grinder
Step 7: Place the spinning GRINDING WHEEL (#45) onto the material to be ground. Let the
weight of the Angle Grinder do the work. Do not press the Angle Grinder into the
material. If the Angle Grinder stalls, release the THROTTLE LEVER immediately.
Step 8: Grind using the outside diameter of the GRINDING WHEEL as much as possible. Do
not attempt to use the recessed inner diameter of the GRINDING wheel as you may
damage the FLANGE NUT (#46).
MAINTENANCE
Your Angle Grinder is best operated with an Airline Oiler. If you are using the Angle Grinder
without an Airline Oiler, follow the steps below for maintenance.
Step 1: Disconnect the Angle Grinder from the air hose.
Step 2: Apply a few drops of PNEUMATIC TOOL
OIL through the air line before each use,
or every hour if used continuously.
CAUTION
Do not use detergent oil or additives as
these lubricants will cause accelerated
wear to the seals in the tool.
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Step 3: Apply a few drops of oil to the THROTTLE LEVER (#59) as shown in Figure 7. Work
the THROTTLE LEVER a few times to lubricate.
Air Inlet
Throttle Lever (#59)
Throttle Lever Lock (#61)
Figure 7 — Lubrication Points
Periodically check the condition of the GRINDING WHEEL (#45). If more than 1/2" of the
GRINDING WHEEL is gone, or if the circular lines in the top of the GRINDING WHEEL are no
longer visible, you must replace the GRINDING WHEEL with an approved replacement Wheel
from Harbor Freight Tools.
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PARTS LIST
Item#
1
2
3
4
5
6
7
8
Description
Motor Housing
Seal Plate
Ball Bearing
Arbor
Ball Bearing
Woodruff Key
Bevel Gear
Wave Washer
External Stop Ring
Gasket
Qty
1
1
1
1
1
1
1
1
1
1
1
1
5
5
1
1
1
1
4
1
1
8
2
1
1
1
1
1
Item# Description
Qty
1
1
1
2
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
29
30
39
40
41
42
43
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
61
62
63
64
65
66
Bevel Pinion
O-Ring
Exhaust Deflector
Tapping Screw
Plug
O-Ring
Flange
Grinding Wheel
Flange Nut
Handle
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Retainer
Wrench
Wrench
Center Wheel Guard
Spring Washer
Hex Head Bolt
Rotor
Front End Plate
Cylinder
Spring Pin
Rotor blade
Rear End Plate
Governor
Pendulum
Spring Pin
Plunger
Adjust Screw
Spring
Ball Bearing
Throttle Valve Housing
Bushing
Air Inlet Bushing
Valve Stem
Valve Spring
Throttle Housing
O-Ring
O-Ring
Throttle Lever
Throttle Lever Lock
Torsion Spring
Spring Pin
Spring Pin
Lock Ring
Adjust Nut
Ball Bearing
Coupling Nut
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
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 MANUFACTUER 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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ASSEMBLY DIAGRAM
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