ROTARY HAMMER
Model 94944
ASSEMBLY AND OPERATING INSTRUCTIONS
Distributed Exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
TO PREVENT SERIOUS INjURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.
Copyright© 2006 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 please call 1-800-444-3353.
2.
3.
Do 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.
Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control. Protect others in the work area from
debris such as chips and sparks. Provide barriers or shields as needed.
ELECTRICAL SAFETY
4.
5.
6.
Grounded tools must be plugged into an outlet properly installed and grounded
in accordance with all codes and ordinances. Never remove the grounding
prong or modify the plug in any way. Do not use any adapter plugs. Check with
a qualified electrician if you are in doubt as to whether the outlet is properly
grounded. If the tools should electrically malfunction or break down, grounding
provides a low resistance path to carry electricity away from the user.
Double 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.
Avoid 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.
7.
8.
Do not expose power tools to rain or wet conditions. Water entering a
power tool will increase the risk of electric shock.
Do not abuse the Power Cord. Never use the Power Cord to carry the tools
or pull the Plug from an outlet. Keep the Power Cord away from heat, oil,
sharp edges, or moving parts. Replace damaged Power Cords immediately.
Damaged Power Cords increase the risk of electric shock.
9.
When operating a power tool outside, use an outdoor extension cord marked
“W-A” or “W”. These extension cords are rated for outdoor use, and reduce the
risk of electric shock.
PERSONAL SAFETY
10.
Stay alert. Watch what you are doing, and use common sense when operating
a power tool. Do not use a power 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.
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PAGE 3
11.
12.
Dress properly. Do not wear loose clothing or jewelry. Contain long hair.
Keep your hair, clothing, and gloves away from moving parts. Loose clothes,
jewelry, or long hair can be caught in moving parts.
Avoid accidental starting. Be sure the Power Switch is off before plugging
in. Carrying power tools with your finger on the Power Switch, or plugging in power
tools with the Power Switch on, invites accidents. Make sure you are prepared to
begin work before turning the Power Switch (62) “ON”.
13.
Remove adjusting keys or wrenches before turning the power tool on. A
wrench or a key that is left attached to a rotating part of the power tool may result
in personal injury.
14.
15.
Do not overreach. Keep proper footing and balance at all times. Proper footing
and balance enables better control of the power tool in unexpected situations.
Always wear eye,hearing,and breathing protection. Wear ANSI-approved
safety impact eye glasses, ANSI-approved hearing protectors, and ANSI-
approved dust mask or respirator when using this product. Also, non-skid
safety shoes and a hard hat must be used for appropriate conditions.
TOOL USE AND CARE
16.
17.
Do not use the power tool if the Power Switch does not turn it on or off. Any
tool that cannot be controlled with the Power Switch is dangerous and must be
replaced or repaired.
Disconnect the Power Cord Plug from the power source before making
any adjustments, changing accessories, or storing the tool. Such
preventive safety measures reduce the risk of starting the tool accidentally.
18.
19.
Store idle tools out of reach of children and other untrained persons. Tools
are dangerous in the hands of untrained users.
Maintain tools with care. Keep cutting tools sharp and clean. Properly
maintained tools with a sharp cutting edge are less likely to bind and are easier
to control. Do not use a damaged tool. Tag damaged tools “Do not use” until
repaired.
20.
21.
Check for misalignment or binding of moving parts, breakage of parts, and
any other condition that may affect the tool’s operation. If damaged, have
the tool serviced before using. Many accidents are caused by poorly maintained
tools.
Use 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.
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PAGE 4
SERVICE
22.
23.
Tool service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result in a risk of injury.
When servicing a tool,use only identical replacement parts. Follow instructions
in the “Inspection, Maintenance, And Cleaning” section of this manual. Use
of unauthorized parts or failure to follow maintenance instructions may create a risk
of electric shock or injury.
GROUNDING
WARNING!
Improperly connecting the grounding wire can result in the risk of electric
shock. Check with a qualified electrician if you are in doubt as to whether the
outlet is properly grounded. Do not modify the power cord plug provided with
the tool. Never remove the grounding prong from the plug. Do not use the
tool if the power cord or plug is damaged. If damaged, have it repaired by
a service facility before use. If the plug will not fit the outlet, have a proper
outlet installed by a qualified electrician.
GROUNDED TOOLS:TOOLS WITH THREE PRONG PLUGS
1.
Tools marked with “Grounding Required” have a three wire cord and three prong
grounding plug. The plug must be connected to a properly grounded outlet. If
the tool should electrically malfunction or break down, grounding provides a low
resistance path to carry electricity away from the user, reducing the risk of electric
shock. (See Figure A, next page.)
2.
3.
The grounding prong in the plug is connected through the green wire inside the
cord to the grounding system in the tool. The green wire in the cord must be the
only wire connected to the tool’s grounding system and must never be attached to
an electrically “live” terminal. (See Figure A.)
Your tool must be plugged into an appropriate outlet, properly installed and grounded
in accordance with all codes and ordinances. The plug and outlet should look like
those in the following illustration. (See Figure A page 6.)
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PAGE 5
FIGURE A
DOUBLE INSULATED TOOLS:TOOLS WITH TWO PRONG PLUGS
4.
5.
Tools marked “Double Insulated” do not require grounding. They have a special
double insulation system which satisfies OSHA requirements and complies with
the applicable standards of Underwriters Laboratories, Inc., the Canadian
Standard Association, and the National Electrical Code. (See Figure B.)
Double insulated tools may be used in either of the 120 volt outlets shown in the
following illustration. (See Figure B.)
FIGURE B
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PAGE 6
EXTENSION CORDS
1.
2.
Grounded tools require a three wire extension cord. Double Insulated tools
can use either a two or three wire extension cord.
As the distance from the supply outlet increases, you must use a heavier gauge
extension cord. Using extension cords with inadequately sized wire causes a
serious drop in voltage, resulting in loss of power and possible tool damage.
(See Figure C)
3.
The smaller the gauge number of the wire, the greater the capacity of the cord.
For example, a 14 gauge cord can carry a higher current than a 16 gauge cord.
(See Figure C, and Figure D.)
4.
5.
If using more than one extension cord to make up the total length, make sure
each cord contains at least the minimum wire size required.
If you are using one extension cord for more than one tool, add the nameplate
amperes and use the sum to determine the required minimum cord size.
(See Figure C, and Figure D.)
6.
7.
If you are using an extension cord outdoors, make sure it is marked with the
suffix “W-A” (“W” in Canada) to indicate it is acceptable for outdoor use.
Make sure your extension cord is properly wired and in good electrical condition.
Always replace a damaged extension cord or have it repaired by a qualified
electrician before using it.
8.
Protect your extension cords from sharp objects, excessive heat, and damp or
wet areas.
RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS*
NAMEPLATE
AMPERES
EXTENSION CORD LENGTH
(At Full Load)
25 Feet
18
50 Feet
75 Feet
18
100 Feet
150 Feet
0 - 2.0
2.1 - 3.4
18
18
18
16
14
12
10
18
16
14
12
10
-
16
14
12
12
-
18
18
3.5 - 5.0
18
16
5.1 - 7.0
18
14
7.1 - 12.0
12.1 - 16.0
16.1 - 20.0
FIGURE C
18
12
14
10
-
12
-
-
-
* Based on limiting the line voltage drop to five volts at 150% of the rated amperes.
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FIGURE C
PAGE 7
SYMBOLOGY
Double Insulated
Canadian Standards
Association
Underwriters
Laboratories, Inc.
Volts Alternating Current
V ~
A
Amperes
No Load Revolutions
per Minute (RPM)
no
xxxx/min.
SPECIFIC SAFETY RULES
1.
Maintain labels and nameplates on the Rotary Hammer. These carry
important information. If unreadable or missing, contact Harbor Freight Tools for a
replacement.
2.
3.
Industrial applications must follow OSHA requirements.
Check for damaged parts. Before using this product, carefully check that it will
operate properly and perform its intended function. Check for damaged parts and
any other conditions that may affect the operation of this product. Replace or repair
damaged or worn parts immediately.
4.
5.
Always disconnect the Rotary Hammer from its electrical outlet before
performing any service, maintenance, or cleaning such as leaving the work
area, moving the tool from one location to another, changing chisels, cleaning dirt
off the unit, etcetera.
WARNING! Some dust created by power sanding, sawing, grinding, drilling, and
other construction activities, contain chemicals known (to the State of California) to
cause cancer, birth defects or other reproductive harm. Some examples of these
chemicals are:
(a) Lead from lead-based paints;
(b) Crystalline silica from bricks and cement or other masonry products;
(c) Arsenic and chromium from chemically treated lumber.
Your risk from these exposures varies, depending on how often you do this
type of work. To reduce your exposure to these chemicals; work in a well ventilated
area, and work with approved safety equipment, such as those dust masks that are
specially designed to filter out microscopic particles. (California Health & Safety
Code 25249.5, et seq.)
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PAGE 8
6.
WARNING! People with pacemakers should consult their physician(s) before using
this product. Electromagnetic fields in close proximity to a heart pacemaker could
cause interference to or failure of the pacemaker.
UNPACKING
When unpacking, check to make sure all parts shown on the Parts Lists and
Assembly Diagrams on pages 15-17 are included. If any parts are missing or broken,
please call Harbor Freight Tools at the number shown on the cover of this manual as soon
as possible.
VIBRATION HAzARD
This tool vibrates during use. Repeated or long-term exposure to vibration may
cause temporary or permanent physical injury, particularly to the hands, arms and
shoulders. To reduce the risk of vibration-related injury:
1.
2.
Anyone using vibrating tools regularly or for an extended period should first be
examined by a doctor and then have regular medical check-ups to ensure medical
problems are not being caused or worsened from use. Pregnant women or people
who have impaired blood circulation to the hand, past hand injuries, nervous system
disorders, diabetes, or Raynaud’s Disease should not use this tool. If you feel any
medical or physical symptoms related to vibration (such as tingling, numbness, and
white or blue fingers), seek medical advice as soon as possible.
Do not smoke during use. Nicotine reduces the blood supply to the hands and
fingers, increasing the risk of vibration-related injury.
3.
4.
Wear suitable gloves to reduce the vibration effects on the user.
Use tools with the lowest vibration when there is a choice between different
processes.
5.
6.
Include vibration-free periods each day of work.
Grip tool as lightly as possible (while still keeping safe control of it). Let the tool do
the work.
7.
To reduce vibration, maintain the tool as explained in this manual. If any abnormal
vibration occurs, stop use immediately.
REV 07j
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PAGE 9
ASSEMBLY INSTRUCTIONS
Note:Turn to pages 16-18 to assist you in identifying the parts mentioned in the
assembly, operating instructions and troubleshooting sections of this manual.
The Rotary Hammer comes fully assembled. There is a Side Handle (74) that must
be attached as needed. There are two places on the Rotary Hammer that will accept
the Side Handle (74) shown below. To attach the Side Handle (74), thread it into the
housing by twisting it in a clockwise rotation until it stops turning.
Side Handle (74)
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PAGE 10
How to attach the chisels
WARNING: Always make sure this tool is not plugged in before changing the bits.
1.
Slide the Bits into the Rotary Hammer with the flat cut-out side facing the Rod (19)
as shown in Figure 2.
2.
Pull out the Rod (19) while you insert the Bit. See Figure 1. The two bits both have
a flat space on the shaft that must be turned horizontally when it is inserted. See
Figure 2. Turn the Rod (19) clockwise 180° to lock the Bit into place. The Bit should
move in and out after it is locked but should not come out.
Flat area of Bit
Rod (19)
Figure 1
Figure 2
OPERATING INSTRUCTIONS
How to turn on the Rotary Hammer
1.
To turn on the Rotary Hammer squeeze the Switch (107) shown below in Figure
3. There is a latch on the upper part of the switch that locks the switch on.
Switch (107)
Figure 3
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PAGE 11
OPERATING INSTRUCTIONS
WARNING: 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. Always wear
ear protection. Ear protection is required for any other persons in the work area.
WARNING: Be aware of flying concrete chips. Keep all spectators clear of the work
area.
WARNING: Do not operate this tool if you have back, neck, wrist, or other conditions or
injuries that will be aggravated by the severe jerking forces that this tool exerts upon its
operator.
WARNING: If the Rotary Hammer ever gets out of your control, immediately release the
Switch (107).
NOTE: Use the weight of the Rotary Hammer to help you break up concrete. Use the tool
in the vertical position whenever possible.
IMPORTANT - READ BEFORE USE
This Rotary Hammer may have decreased performance for a brief period at the beginning
of each use. This warmup period lasts approximately 3-5 minutes. This happens
because the grease inside the tool may be somewhat thick, preventing the tool from
operating at full efficiency while the motor is cold. This is perfectly normal and does not
indicate a problem. To help reduce this effect, we recommend storing this equipment
in temperatures no lower than 50-60° F.
Chipping in a straight line
1.
Use chalk or another suitable writing material and mark you work surface to
delineate the area you intend to hammer.
2.
3.
Plug in the Rotary Hammer.
Grasp the handles firmly with both hands. When you are sure that no people or
animals are in the vicinity, and it’s safe to begin, depress the Switch (107).
4.
5.
The Rotary Hammer will begin to break the top layer of concrete. If you push down,
it will begin to break the next layer as well.
Keep moving the Rotary Hammer along the line you want to section, breaking
concrete as you go. If the Rotary Hammer jumps off of the line or section, release
the Switch (107) and reposition the Rotary Hammer.
6.
When you are finished, release the Switch (107) and unplug the Rotary Hammer.
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Breaking up concrete
1.
2.
Place the bit on the center of a piece of concrete.
Grasp the handles firmly with both hands. When you are sure that no people or
animals are in the vicinity, and it’s safe to begin, depress the Switch (107).
3.
As you break the concrete into big chunks, release the Switch (107) and move to
other large pieces until all of the larger pieces are broken. Do not try to break up
smaller pieces with this tool as it is too powerful and aggressive to control on small
pieces.
4.
When you are finished, release the Switch (107) and unplug the Rotary Hammer.
Using the Rotary Hammer as a hammer drill
NOTE: When you inset the Auger bit the Rotary Hammer will automatically convert into a
rotary hammer. The Auger bit will rotate and hammer at the same time.
1.
2.
Place the bit on the center of a piece of concrete.
Grasp the handles firmly with both hands. When you are sure that no people or
animals are in the vicinity, and it’s safe to begin, depress the Switch (107).
3.
4.
As you drill into the concrete firmly press against the material being drilled into.
When you are finished, release the Switch (107) and unplug the Rotary Hammer.
How to adjust the Masonry Drill (118) speed
The Masonry Drill (118) speed is adjusted by turning the Speed Control Knob (100) See
Figure 4. The higher the number the faster the Masonry Bit (118) will spin. The Rotary
Hammer will automatically rotate and hammer once you attach the Masonry Bit (118).
Speed Control Knob (100)
Figure 4
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INSPECTION, MAINTENANCE, AND CLEANING
1.
2.
WARNING! Always disconnect the Rotary Hammer from its electrical
power supply source before performing any inspection, maintenance,
or cleaning procedure.
Before each use, inspect the general condition of the Rotary Hammer.Inspect switch,
power plug and cord assembly, and extension cord (if used) for damage. Check for
loose screws, misalignment, binding of moving parts, broken, cracked, or improper
mounting of the chisels. If abnormal noise or vibration occurs, turn off the Rotary
Hammer immediately and have the problem corrected before further use. Do not
use damaged equipment!
Left Tail Cover Left
LED Light
Figure 5
How to add grease to the gears
Every 100 hours of use it is recommended that you add wheel bearing grease to the
gears. To get access to the gears, you must remove Crank Case Cover (40) by removing
the six machine screws (37). Next rub wheel bearing grease on all the gears in the
chamber. Replace the Crank Case Cover (40) using the same machine screws (37) that
held it on. See the assembly diagram on page 17 to identify the parts.
TROUBLESHOOTING
Problem
Cause
Action
Motor doesn’t rotate
when switched on.
Disrupted power
Poor switch contact
Check power supply
Have switch repaired
Worn carbon brushes Replace brushes
Overheated gearbox
Dull Drill Bit
Replace or sharpen the Drill Bit
Excessive use
Gears need grease
Allow tool to cool down
Add grease to the gears
NOTE: Other than changing or cleaning the carbon brushes, all other internal repairs
should be done by a qualified service technician.
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PAGE 15
PARTS LIST
Part
1
Description
Screw M8X35
Qty
4
4
1
2
1
1
1
1
1
2
2
4
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1
2
1
1
Part
Description
Qty
1
1
4
6
6
1
1
8
8
1
1
1
1
2
1
2
1
1
1
1
2
1
1
2
1
2
1
1
1
1
1
1
1
1
35 Connecting Rod
36 Needle Bearing NK121918
37 Screw M5x25
38 Spring Washer 5
39 Washer 5
2
Spring Washer Ø8
Pin 4X17
3
4
Washer 18X12X1
Spring Seat
Ring
5
6
40 Crank Case Cover
41 Feather Key
7
Spring
8
Collar
42 Clutch Plate
9
Oil Seal
43 Spring
10 O-ring
44 Fifth Gear
11 O-ring
45 Plastic sheet
46 fourth Gear
12 Steel pole
13 Retainer Sleeve
14 Clip Ring
15 Clip Ring 68
16 Oil Bearing
17 Oil Bearing baffle
18 Orientation steel Ring
19 Rod
47 Slip Plate
48 Needle Plate K14X18X13
49 Roll turn outside the needle
50 Needle Bearing HK1816
51 Third Crank Shaft
52 Pin B4X8
53 Second Four Gear
54 Clip Ring 40
20 O-ring
21 Washer
55 Washer 35X18X1
56 Needle Plate
57 Crank Case
22 O-ring
23 Ram
24 Ram baffle
25 Front oil Bearing
26 Dead block
27 Profiled block
28 Cylinder
58 Screw M5X35
59 MI Ring
60 Screw ST4X35
61 Damping Seat
62 Damping Spring
63 Damping closure rail
64 Washer
29 Black oil bearing
30 Six Gear
31 Ram
65 Clip Ring
32 O-ring 40x5
33 Piston pin
34 Piston
66 Ball Bearing 6002
67 O-ring
68 Gear Cover
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PARTS LIST CONTINUED
Part
Description
Qty
1
1
1
1
2
1
1
1
7
7
7
1
2
1
1
1
1
1
1
4
4
1
1
1
1
1
8
1
1
1
1
1
1
7
Part
Description
Qty
2
2
2
2
1
1
1
1
2
4
1
1
1
1
1
1
1
1
2
2
69 Fan Guide
103 Spring
70 Rotor
104 Brush Housing
105 Carbon Brush
106 Screw ST4X10
107 Switch
71 Respond Washer
72 Stator
73 Special Nut
74 Side Handle
75 Adjust Stalk
76 Tail Cover
108 Capacitance 0.22UF
109 Inductance
110 Cord Clip
77 Washer 5
111 Screw ST4X16
112 O-ring 24X5
113 Right Handle
114 Cord Jacket
115 Cord
78 Spring Washer 5
79 Screw M5X16
80 Screw M8X170
81 Side Handle holder
82 Clamp
116 Lift Handle
83 D Side Handle
84 Special Nut
117 Grease and Oil box
118 Masonry Drill
119 Chisel Bit
85 Six Nut M8
86 Nut Cover
120 Case
87 Adjust Set
121 Screw ST4.8X70
122 Feather Key
88 Screw M8x40
89 Screw ST6X16-F
90 Nut Plank
91 Right Tail Cover
92 Ball Bearing 6000
93 Ball Bearing Set
94 Housing
95 Screw ST4X14
96 Left Tail Cover
97 Stretch forward
98 Stretch forward Clip
99 Screw ST4X10
100 Speed Control Knob
101 Screw ST4.8X30
102 Screw ST4X18
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ASSEMBLY DIAGRAM
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PAGE 18
WARRANTY
LIMIteD 90 DAy wARRAnty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability
standards, and warrants to the original purchaser that this product is free from defects in materials and
workmanship for the period of ninety days from the date of purchase. This warranty does not apply
to damage due directly or indirectly, to misuse, abuse, negligence or accidents, repairs or alterations
outside our facilities, or to lack of maintenance. We shall in no event be liable for death, injuries to
persons or property, or for incidental, contingent, special or consequential damages arising from the
use of our product. Some states do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation of exclusion may not apply to you.THiSWarranTy iS expreSSly
in lieu oF all oTHer WarranTieS, expreSS or implied, inCluding THe WarranTieS
oF merCHanTabiliTy and FiTneSS.
To take advantage of this warranty, the product or part must be returned to us with transportation
charges prepaid. proof of purchase date and an explanation of the complaint must accompany the
merchandise. if our inspection verifies the defect, we will either repair or replace the product at our
election or we may elect to refund the purchase price if we cannot readily and quickly provide you
with a replacement. We will return repaired products at our expense, but if we determine there is no
defect, or that the defect resulted from causes not within the scope of our warranty, then you must
bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state
to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED
THE PARTS DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY.
NEITHERTHE MANUFACTURER NOR DISTRIBUTOR MAKES ANY REP-
RESENTATION 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 TECHNI-
CIANS AND NOT BYTHE 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 19
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