SLIMLINE BENCH GRINDER MODEL H4378/H4379 INSTRUCTION MANUAL Model H4379 Model H4378 COPYRIGHT © APRIL, 2002 BY GRIZZLY INDUSTRIAL, INC. WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC. PRINTED IN CHINA. ONLINE MANUAL DISCLAIMER THE INFORMATION IN THIS MANUAL REPRESENTS THE CONFIGURATION OF THE MACHINE AS IT IS CURRENTLY BEING SHIPPED. THE MACHINE CONFIGURATION CAN CHANGE AS PRODUCT IMPROVEMENTS ARE INCORPORATED.
WARNING Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are: • Lead from lead-based paints. • Crystalline silica from bricks, cement, and other masonry products. • Arsenic and chromium from chemically treated lumber. Your risk from these exposures varies, depending on how often you do this type of work.
Table Of Contents PAGE 1. 2. 3. 4. 5. 6. 7. SAFETY SAFETY RULES FOR POWER TOOLS ..........................................................2-3 ADDITIONAL SAFETY INSTRUCTIONS FOR GRINDERS ................................4 CIRCUIT REQUIREMENTS 110V OPERATION ..............................................................................................5 EXTENSION CORDS ..........................................................................................5 GROUNDING .....................................
SECTION 1: SAFETY For Your Own Safety Read Instruction Manual Before Operating This Equipment The purpose of safety symbols is to attract your attention to possible hazardous conditions. This manual uses a series of symbols and signal words which are intended to convey the level of importance of the safety messages. The progression of symbols is described below. Remember that safety messages by themselves do not eliminate danger and are not a substitute for proper accident prevention measures.
Safety Instructions For Power Tools 9. USE PROPER EXTENSION CORD. Make sure your extension cord is in good condition. Conductor size should be in accordance with the chart below. The amperage rating should be listed on the motor or tool nameplate. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. Your extension cord must also contain a ground wire and plug pin. Always repair or replace extension cords if they become damaged.
Additional Safety Instructions For Grinders 1. ALWAYS WEAR EYE PROTECTION! 2. MAKE SURE GRINDER IS SECURED FIRMLY TO A BENCH OR STAND BEFORE USE. Any “wobbles” must be corrected by shimming or blocking before operation. 3. BEFORE MOUNTING A NEW WHEEL, BE SURE WHEEL RPM IS RATED AT AN EQUAL OR HIGHER RPM THAN THE GRINDER. 4. DO NOT GRIND ON THE SIDES OF THE GRINDING WHEELS, unless they are special wheels designed specifically for this purpose. 5. ONLY USE FLANGES THAT ARE INCLUDED WITH THE GRINDER.
SECTION 2: CIRCUIT REQUIREMENTS 110V Operation The Model H4378 is wired for 110V and will draw 2.5 amps. The Model H4379 is wired for 110V and will draw 3.5 amps. If you operate this machine on any circuit that is already close to its capacity, it might blow a fuse or trip a circuit breaker. However, if an unusual load does not exist and a power failure still occurs, contact a qualified electrician or our service department. This equipment must be grounded.
SECTION 3: INTRODUCTION Commentary We are proud to offer the Grizzly Model H4378/H4379 Slimline Bench Grinder. The Model H4378/H4379 is part of a growing Grizzly family of fine woodworking machinery. When used according to the guidelines set forth in this manual, you can expect years of trouble-free, enjoyable operation and proof of Grizzly’s commitment to customer satisfaction. The Model H4378 offers a 1⁄3 HP, 3450 RPM motor and a 6" grinding wheel. The Model H4379 offers a 1⁄2 H.P.
SECTION 4: ASSEMBLY Unpacking Piece Inventory The Model H4378/H4379 is shipped from the manufacturer in a carefully packed carton. If you discover the machine is damaged after you have signed for delivery, immediately call Customer Service for advice. After all the parts have been removed from the carton, you should have: When you are completely satisfied with the condition of your shipment, you should inventory its parts. Some metal parts may have sharp edges on them after they are formed.
Mounting Tool Rests The Model H4378/H4379 weighs 22/27 lbs. Make sure the workbench on which you plan to mount the grinder is sturdy enough to hold the weight of the machine and any downward pressure that may be applied during operation. The workbench should have a level surface and be heavy, or attached to the floor, so it will not move during operation. To mount the grinder: The tool rest provides a surface that can be used to support the workpiece during grinding.
SECTION 5: OPERATIONS Keep loose clothing rolled up and out of the way of machinery and keep hair pulled back. ! Disconnect power to the machine when performing any maintenance, assembly or adjustments. Failure to do this may result in serious personal injury. Wear safety glasses during the entire operation process. Failure to comply may result in serious personal injury. Using this machine produces dust which may cause allergic reactions and respiratory problems.
Safe Grinding Wheel Care The grinder is a safe tool when used properly. In addition to the safety instructions in this manual, the most important safety consideration is to use common sense at all times. What may be okay in one situation, may not be safe in another. Your safety when grinding depends, on a large part, on the condition of the wheel during grinding.
Wheel Selection The Model H4378 only accepts Type-1 wheels with a 1⁄2" bore. The Model H4379 only accepts Type-1 wheels with a 5⁄8" bore. Aluminum oxide and silicon carbide wheels are marked in a somewhat uniform manner by all the major manufacturers. Understanding these markings will help you understand the capabilities of various wheels. Always refer to the manufacturer’s grinding recommendations when selecting a wheel for your project.
Wheel Inspection Before mounting a new grinding wheel, it must be inspected. Do not assume that a wheel is in sound condition just because it is new—often, damage can occur in shipping, with age, or with exposure to moisture.
Wheel Mounting Paper/Fiber Disc The wheel guard assembly must be removed in order to mount or dismount a grinding wheel. To do this: Flange Flange umi numn O M 0 R P Al xide Type-1 Disconnect the grinder from the power supply! 350 1. ri Remove the outer wheel flange and the paper disc. Pull the wheel free from the arbor. There will also be a paper disc and a wheel flange on the back side of the wheel. 5. Mount the new wheel in the reverse order or as shown in Figure 3.
SECTION 6: MAINTENANCE Lubrication ! Disconnect power to the machine when performing any maintenance, assembly or adjustments. Failure to do this may result in serious personal injury. Sealed and pre-lubricated ball bearings require no lubrication for the life of the bearings. All bearings are standard sizes, and replacements can be purchased from our parts department or a bearing supply store. General Always be aware of the condition of your grinder.
Maintenance Notes Date Approximate Hours Of Use H4378/H4379 Slimline Bench Grinder Maintenance Performed -15-
SECTION 8: CLOSURE The following pages contain general machine data, parts diagrams/lists, a troubleshooting guide and Warranty/Return information for your Model H4378/H4379. If you need parts or help in assembling your machine, or if you need operational information, we encourage you to call our Service Department. Our trained service technicians will be glad to help you.
TROUBLESHOOTING This section covers the most common problems encountered in grinding and what to do about them. Do not make any adjustments until grinder is unplugged and moving parts have come to a complete stop. SYMPTOM POSSIBLE CAUSE Motor will not start. 1. 2. Low voltage. 1. Open circuit in motor or loose 2. connections. Check power line for proper voltage. Inspect all lead connections on motor for loose or open connections. Motor will not start; fuses or 1. circuit breakers blow. 2.
MACHINE DATA SHEET Customer Service #: (570) 546-9663 • To Order Call: (800) 523-4777 • Fax #: (800) 438-5901 MODEL H4378 SLIMLINE BENCH GRINDER Design Type.......................................................................... Bench Model Overall Dimensions: Height ..............................................................................................10" Width............................................................................................185⁄16" Depth ................................
MACHINE DATA SHEET Customer Service #: (570) 546-9663 • To Order Call: (800) 523-4777 • Fax #: (800) 438-5901 MODEL H4379 SLIMLINE BENCH GRINDER Design Type.......................................................................... Bench Model Overall Dimensions: Height............................................................................................101⁄2" Width............................................................................................187⁄16" Depth ................................
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MODEL H4378 PARTS Ref# Part# Description Ref# Part# Description 02 03 04 05 06 07 09 13 14 15 16 18 19 20 21 22 23 24 25 26 COVER HEX NUT 1⁄2" FLANGE GRINDER WHEEL FLANGE WHEEL GUARD SPARK BREAKER FLAT WASHER 5⁄16" KNOB SCREW 1⁄4"-20 X 3⁄8" EYESHIELD ADJUSTABLE REST HEX BOLT 5⁄16"-18 X 3⁄8" BUSHING BALL BEARING 6202-2RS MOTOR STATOR WIRE NUT MOTOR SHAFT SPARK BREAKER ADJUSTABLE REST WHEEL GUARD 27 28 29 30 31 32 33 34 35 36 37 38 39 41 42 43 44 46 47 48 GRINDER WHEEL LEFT HAND HEX NUT 1⁄2" WIRE STRAI
WARRANTY AND RETURNS Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original purchaser from the date of purchase. This warranty does not apply to defects due directly or indirectly to misuse, abuse, negligence, accidents, repairs or alterations or lack of maintenance.
WARRANTY CARD Name ____________________________________________________________________________________ Street ____________________________________________________________________________________ City ______________________________________________________________State________Zip_________ Phone Number_______________________E-Mail_______________________FAX________________________ MODEL # H4378/H4379 Slimline Bench Grinder Serial# ___________________ Order# ________________ The following information is given o
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