ROTARY HAMMER Model 94944 ASSEMBLY AND OPERATING INSTRUCTIONS Distributed Exclusively by Harbor Freight Tools®. 3491 Mission Oaks Blvd., Camarillo, CA 93011 Visit our Web site at http://www.harborfreight.com To prevent serious injury, Read and understand all warnings and instructions before use. Copyright© 2006 by Harbor Freight Tools®. All rights reserved.
PRODUCT SPECIFICATIONS ITEM DESCRIPTION Electrical Requirement 120 Volt / 60 Hz / 16 Amps (running) Impactor Travel 1.65” (21mm) Overall Dimensions 29” L X 6-3/8”W X 9-3/4” H (hammer only) Blows per minute 750 - 1950 No load speed 100 - 250 RPM Retainer Style Spring loaded rotational lock (2 positions only) Bit Dimensions: Chisel Bit (part#119): 3/4” Shank X 14-7/8” L Masonry Drill (part# 118): 3/4” Dia. X 16-1/2” L Noise Level 105 db (A) Impact Energy 3.7 to 18.4 Ft/Lbs. Tool Weight 32.2 Lbs.
2. 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. 3. 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.
11. 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. 12. 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.
SERVICE 22. Tool service must be performed only by qualified repair personnel. Service or maintenance performed by unqualified personnel could result in a risk of injury. 23. 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.
FIGURE A DOUBLE INSULATED TOOLS: TOOLS WITH TWO PRONG PLUGS 4. 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.) 5. Double insulated tools may be used in either of the 120 volt outlets shown in the following illustration. (See Figure B.
EXTENSION CORDS 1. Grounded tools require a three wire extension cord. Double Insulated tools can use either a two or three wire extension cord. 2. 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.
SYMBOLOGY Double Insulated Canadian Standards Association Underwriters Laboratories, Inc. V~ A no xxxx/min. Volts Alternating Current Amperes No Load Revolutions per Minute (RPM) 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. Industrial applications must follow OSHA requirements. 3. Check for damaged parts.
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.
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.
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.
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.
Breaking up concrete 1. 2. 3. 4. 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). 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.
INSPECTION, MAINTENANCE, AND CLEANING 1. WARNING! Always disconnect the Rotary Hammer from its electrical power supply source before performing any inspection, maintenance, or cleaning procedure. 2. 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.
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 Motor doesn’t rotate when switched on.
PARTS LIST Part 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Description Screw M8X35 Spring Washer Ø8 Pin 4X17 Washer 18X12X1 Spring Seat Ring Spring Collar Oil Seal O-ring O-ring Steel pole Retainer Sleeve Clip Ring Clip Ring 68 Oil Bearing Oil Bearing baffle Orientation steel Ring Rod O-ring Washer O-ring Ram Ram baffle Front oil Bearing Dead block Profiled block Cylinder Black oil bearing Six Gear Ram O-ring 40x5 Piston pin Piston SKU 94944 Qty 4 4 1
PARTS LIST CONTINUED Part 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 Description Fan Guide Rotor Respond Washer Stator Special Nut Side Handle Adjust Stalk Tail Cover Washer 5 Spring Washer 5 Screw M5X16 Screw M8X170 Side Handle holder Clamp D Side Handle Special Nut Six Nut M8 Nut Cover Adjust Set Screw M8x40 Screw ST6X16-F Nut Plank Right Tail Cover Ball Bearing 6000 Ball Bearing Set Housing Screw ST4X14 Left Tail Cover Stretch forward Stretch
ASSEMBLY DIAGRAM SKU 94944 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.
