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National 3425 Instruction Manual

Grinder/edger
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#3425 GRINDER/EDGER
INSTRUCTION MANUAL
Read Manual Before Operating Machine
National
Flooring Equipment, Inc.
9250 X
A
N
• M
, MN 55445 • U.S.A.
YLON
VENUE
ORTH
INNEAPOLIS
800-245-0267 • 763-535-8206 • F
763-535-8255 • F
800-648-7124
AX
AX
W
S
: www.nationalequipment.com • E-M
: info@nationalequipment.com
EB
ITE
AIL

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  • Page 1 #3425 GRINDER/EDGER INSTRUCTION MANUAL Read Manual Before Operating Machine National Flooring Equipment, Inc. 9250 X • M , MN 55445 • U.S.A. YLON VENUE ORTH INNEAPOLIS 800-245-0267 • 763-535-8206 • F 763-535-8255 • F 800-648-7124 : www.nationalequipment.com • E-M : info@nationalequipment.com...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Table of Contents ......................2 Rules for Safe Operation ..................3-6 A. Grounding ......................5 B. Extension Cords ....................6 Transportation......................7 Set-Up ........................8 A. Handle Assembly ....................8 Running Machine ......................9 A. Machine Start Up Procedure................9 Procedure ......................10-17 A. Grinder Mode ....................10 B.

  • Page 3: Rules For Safe Operation

    USE” until repaired. A guard or other damaged parts should be properly repaired or replaced. For all repairs, insist on only identical National replacement parts. 12. REMOVE ALL ADJUSTING KEYS AND WRENCHES: Make a habit of checking that the adjusting keys, wrenches, etc.
  • Page 4 26. MAINTAIN LABELS AND NAMEPLATES: These carry important information. If unreadable or missing, contact National for a free replacement. 26. MACHINE IS HEAVY, DO NOT DROP: WARNING: Exposure to dust may cause respiratory ailments. Use approved NIOSH or OSHA respirators, safety glasses or face shields, gloves and protective clothing.

  • Page 5: Grounding

    RULES FOR SAFE OPERATION 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 plug provided with the tool. Never remove the grounding prong from the plug. Do not use the tool if the cord or plug is damaged.

  • Page 6: Extension Cords

    RULES FOR SAFE OPERATION EXTENSION CORDS WARNING: Electrical cords can be hazardous. Misuse can result in fire or death by electrical shock. Read carefully and follow all directions. Grounded tools require a three wire extension cord. Double insulated tools can use either a two or three wire extension cord.

  • Page 7: Transportation

    TRANSPORTATION LOAD AND UNLOAD • Remove plate before loading or unloading. • Always disconnect from power source before transporting. • Loosening Handle Securing “T” Bolts to slide handle down to make machine easier to load. Retighten “T” Bolts when handle is at the desired height. •...

  • Page 8: Set-Up

    SET-UP HANDLE ASSEMBLY WARNING: Handle must be engaged with both securing "T" bolts. Failure to do so could cause serious injury. Handle allows for 7-1/2" of adjustment depending on operator height. Insert handle (See Figure 1) to desired length and properly tighten both locking "T" bolts (See Figure 2). Plug handle cord into motor cord (See Figure 3).

  • Page 9: Running Machine

    RUNNING MACHINE MACHINE START UP PROCEDURE TO RUN MACHINE 1. Machine MUST be off before plugging machine into power source. 2. Plug power cord into proper size extension cord. 3. Plug power cord into outlet. 4. Plug the motor cord plug into the handle cord plug if not connected. 5.

  • Page 10: Procedure

    PROCEDURE GRINDER MODE (Figure 1) Make sure plate or cup wheel is completely covered and not protruding out from the shroud. Shroud should suck to the floor when vacuum is turned on. Do not have plate exposed when using the machine in grinder mode.

  • Page 11: Plate Or Cup Wheel Attachment

    PROCEDURE PLATE OR CUP WHEEL ATTACHMENT Many choices of plates and cup wheels are available for: scraping and grinding. WARNING: Never operate machine with a plate or cup wheel attachment that is not rated at a minimum of 1725 RPM. Never operate machine with plate or cup wheel larger than 10"...

  • Page 12: Plate Removal

    PROCEDURE PLATE REMOVAL Unplug machine from power source. Tilt machine back. Hold disk with one hand. Loosen with the other hand using the proper size wrench. Remove mounting bolt and slide plate off. WARNING: This machine is designed to run plates or cup wheels with a 5/8'' arbor. No larger than a 10'' diameter plate with a 10'' shroud or no larger than a 7'' diameter plate with a 7'' shroud.

  • Page 13: E. Shroud

    PROCEDURE REMOVING OR CHANGING THE SHROUD Unplug machine from power source. Failure to do so could cause damage to machine or serious bodily injury. Remove the flower washer. Remove the disk or the cup plate. Remove the four shroud securing screws (See Figure 9).

  • Page 14: Wheel Adjustment

    PROCEDURE WHEEL ADJUSTMENT The wheels are independently adjustable in height, which allows for pressure to be applied at any point around the perimeter of the plate or cup wheel (See Figure 12). The built-in leveling system (See Figure 13) indicates alignment of the disk to the floor and where pressure is being applied to the plate or cup wheel.

  • Page 15: Handle

    PROCEDURE ROTATING WHEELS FOR EDGER MODE Wheels will need to be angled when using the machine in the edger mode. Loosen the height and angle wheel lock (See Figure 16). (Handle will also need to be adjusted. See handle adjustment). Rotate wheels to the desired location (See Figure 17).

  • Page 16: Belt

    PROCEDURE BELT The machine uses a 4L-330 belt smooth or cogged. Cogged belts give a better grip to the pulley. TO REMOVE OR CHANGE BELT Unplug machine from power source. Remove the cover. Loosen the four bolts on the motor base See Figure 21).

  • Page 17: Vacuum Port

    PROCEDURE VACUUM PORT The machine is provided with a vacuum port on the shroud (See Figure 25). Use a vacuum hose that snugly fits either on the outside or the inside of the port. The outside diameter of the port is 2". The inside diameter of the port is 1-3/4".

  • Page 18: Maintenance

    10. Do not force machine. 11. Do not alter machine. 12. Keep wheels free from debris. 13. Maintain Labels. These carry important information. If unreadable or missing, contact National for a free replacement. 14. Replace warn or damaged parts ie, switches, guards, belts, etc.

  • Page 19: Cleaning

    REPAIRS If your tool is damaged, call for a return/repair authorization number and return to: National Flooring Equipment, Inc. 9250 Xylon Avenue Minneapolis, MN 55445 (763) 535-8206 • 800-245-0267 •...

  • Page 20: Troubleshooting

    4. Defective power cord. NOISY OR EXCESSIVE VIBRATION 1. Defective motor. Contact National for service. 2. Bad belt or belt needs maintenance. Retighten or change the belt. 3. Plate or cup wheel is out of balance. Change plate or rebalance.

  • Page 21: Complete Parts List

    COMPLETE PARTS LIST PART # DESCRIPTION 3420-2 7'' CUP WHEEL 3425-1 HANDLE BRACKET 3425-3 MOTOR MOUNT 3425-7 HANDLE ONLY (NO WIRING) 3425-8 BASE PLATE 3425-13 UPPER BEARING HOUSING 3425-14 GRINDING WHEEL DRIVE SHAFT 3425-18 BELT COVER 3425-19L WHEEL SHAFT, LEFT...

  • Page 22: Complete Parts List

    PART # DESCRIPTION CAUTION, CORD LABEL L104A MOVING PARTS LABEL L104B READ & UNDERSTAND LABEL L104D PROPERLY GROUNDED LABEL L141 FLAG LABEL, MADE IN USA L176 NATIONAL LABEL L235 #3425 GRINDER/EDGER LABEL L265 SILICA DUST LABEL (NOT SHOWN) Page 22...
  • Page 23 PART NUMBERS & DIAGRAMS TRANSPORTATION HANDLE PARTS 73240 3425-166 3425-7 73515 73525 PART # DESCRIPTION PART # DESCRIPTION 3425-1 Handle Bracket 6274-173 Handle Cord 3425-7 Handle Only (No Wiring) 6274-175 Strain Relief (2) 3425-166 Handle Body Wired Complete 73240 3/8-16 T-Bolt (2)
  • Page 24 PART NUMBERS & DIAGRAMS TRANSPORTATION HANDLE PARTS 73017 73008 3425-165 166H 80101 74401 166G 74401 166D PART # DESCRIPTION 3425-165 Handle Grip (2) 6274-166D Handle Cap 6274-166G Handle Switch Plate 6274-166H Handle Control Lever 6274-191 Handle Switch 73008 Lever Securing Nylock Nut 1/4-20...
  • Page 25 PART NUMBERS & DIAGRAMS TRANSPORTATION MOTOR PARTS PART # DESCRIPTION PART # DESCRIPTION 6274-172 Power Cord Plug/Male 6274-186 Motor Fan (Not Shown) 6274-176 Motor 110V 1-1/2 HP 6274-187A Capacitor, Start (Not Shown) 6274-176W Motor 220V 1-1/2 HP (Not Shown) 6274-187B Capacitor, Run (Not Shown) 6274-185 Motor Fan Cover...
  • Page 26 PART NUMBERS & DIAGRAMS TRANSPORTATION WHEEL PARTS PART # DESCRIPTION 3425-40L Wheel Assembly, Left 3425-40R Wheel Assembly, Right Page 26...
  • Page 27 PART NUMBERS & DIAGRAMS TRANSPORTATION WHEEL PARTS 73402 73404 PART # DESCRIPTION 3425-19L Wheel Shaft, Left 3425-19R Wheel Shaft, Right 3425-20 Wheel (2) 3425-21 Wheel Spacer 3425-41 Wheel Adjustment Assembly (2) 73402 1/2-13 Nylon Lock Nut (2) 73404 1/2 Flat Washer (2)
  • Page 28 73204 73902 73101 73069 73413 71101 73069 PART # DESCRIPTION PART # DESCRIPTION 3425-8 Base Plate 73203 3/8 Flat Washer (4) 3425-13 Upper Bearing Housing 73204 3/8 Split Washer (4) 3425-14 Grinding Wheel Drive Shaft 73205 3/8-16 x 3/4 Hexhead Bolt (4)

  • Page 29: Part Numbers And Diagrams

    73205 73205 73001 73204 73205 73204 73205 74413 PART # DESCRIPTION PART # DESCRIPTION 3425-3 Motor Mount 3425-45 Level 3425-18 Belt Cover 73001 1/4-20 x 1/2 Wizlock Bolt (5) 3425-26 Shroud Securing Hook 73204 3/8 Split Lock Washer (4) 3425-27...
  • Page 30 PART NUMBERS & DIAGRAMS PARTS 3427 3428 3429-2 3429-1 73038 3429 3420-2 3426 3431 PART # DESCRIPTION PART # DESCRIPTION 3426 10'' Cup Plate 3429-1 Flower Washer Only 3427 10'' Shroud Only 3420-2 7'' Cup Wheel 3428 7'' Shroud Only 3431 10'' Flate Plate 3429...

  • Page 31: Labels

    PART # DESCRIPTION Caution, Cord Label L141 Flag Label, Made in USA L104A Moving Parts Label L176 National Label L104B Read & Understand Label L235 #3425 Grinder/Edger Label L104D Properly Grounded Label L265 Silica Dust Label (Not Shown) Page 31...

  • Page 32: Guarantee

    In no event shall National be liable, or in any way responsible for any damage or defects in the product which were caused by repairs or attempted repairs performed by anyone other than National. Nor shall National be liable, or in any way responsible, for any incidental or consequential, economics or property damage.

  • Page 33: Return Sheet

    Telephone Number Approximate Usage (hours) Problems Encountered Check One: Repair Do you wish to be contacted before repairing Return Contact National if a loaner is needed Return Authorization Number Date required, contact National Customer Number if known Purchased From if not directly from National...

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