National Flooring Equipment 550 User manual

Read Manual Before Operating Machine
ADJUSTABLE HANDLE SCRAPER
INSTRUCTION MANUAL
101713

Table of Contents
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Table of Contents .......................................................................................................................................................... 3
Features and Specifications......................................................................................................................................... 4
Safety...........................................................................................................................................................................5-8
General Use for Safe Operation.........................................................................................................................5-6
Characteristics of a Defensive Operator................................................................................................................ 7
Grounding.............................................................................................................................................................. 8
Extension Cords .................................................................................................................................................... 9
Machine Operation.................................................................................................................................................10-14
Assembly............................................................................................................................................................. 10
Wheel Adjustment................................................................................................................................................ 10
Handle Adjustment............................................................................................................................................... 10
Machine Start Procedure..................................................................................................................................... 10
User General Information .................................................................................................................................... 10
Transportation.......................................................................................................................................................11
Preparing The Machine For The Job................................................................................................................... 12
Blade Changing..............................................................................................................................................12-13
Application Setup................................................................................................................................................. 13
Blade Sharpening................................................................................................................................................ 14
Blades......................................................................................................................................................................15-16
Machine Maintenance ................................................................................................................................................. 17
Maintaining Equipment........................................................................................................................................ 17
Cleaning............................................................................................................................................................... 17
Repairs ................................................................................................................................................................ 17
Troubleshooting Guide............................................................................................................................................... 18
Parts List and Diagrams ........................................................................................................................................19-26
Complete Parts List ............................................................................................................................................. 19
External Parts...................................................................................................................................................... 20
Handle Assembly................................................................................................................................................. 21
Cutting Head Assembly ....................................................................................................................................... 21
Eccentric Parts..................................................................................................................................................... 21
Switch Parts......................................................................................................................................................... 22
Handle Parts........................................................................................................................................................ 22
Adjustment Parts ................................................................................................................................................. 23
Bearing Plate Securing Mounts........................................................................................................................... 23
Wheel Parts......................................................................................................................................................... 24
Motor.................................................................................................................................................................... 24
Front Weight........................................................................................................................................................ 25
Blade Cover......................................................................................................................................................... 25
Blade Wrench...................................................................................................................................................... 25
Shank Holder....................................................................................................................................................... 25
Optional Add-on Front Weight ............................................................................................................................. 25
#550 Labels......................................................................................................................................................... 25
Guarantee..................................................................................................................................................................... 27

Features and Specifications
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FEATURES
Product Specifications
Width Length Height Weight Speed RPM Voltage HP Amps
(full load)
15” 24” 45” w/handle
20” w/o handle
115 lbs
(machine
only) Manual 1725 110 1 Under 10
Adjustable Handle - The adjustable handle allows the operator to
adjust for comfort.
Foot Bar - The foot bar enables the operator greater ease of produc-
tion by creating more momentum through the material. The use of
lower body strength reduces fatigue.
Angle Adjustment - The manual angle adjustment wheel allows the
operator to adjust the pitch of the blade from shallow to steep depend-
ing on the material being removed. This keeps the scraper “in work”
and prevents floor and sub-floor gouging.
Lift Handle -Allows for single person loading and unloading.
Cutting Head - The oscillating action drive rotates the cutting head
in a circular motion. This efficiently cuts through multiple substrate
materials and increases blade longevity.
Adjustable Handle
Foot Bar
Angle Adjustment
Lift Handle
Cutting Head

Safety
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Safety
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GENERAL RULES FOR SAFE OPERATION
READAND SAVEALL INSTRUCTIONS FOR FUTURE USE. Before use, ensure operators reads and understand this manual. Read and
understand labeling on machine and components.All operators must view the instruction video. Extra copies of the manual and video are avail-
able.
1. KNOWYOUR EQUIPMENT:Readthismanualcarefullyto learn equipment applications and limitations, potential hazards associatedwith
this type of equipment. Keep this manual with the equipment it is associated with.
2. GROUND YOUR EQUIPMENT: See Grounding Page 7.
3. AVOIDDANGEROUSENVIRONMENTS:Donotuseinrain,damporwetlocations,orinthepresenceofexplosiveatmospheres(gaseous
fumes, dust or flammable materials). Remove materials or debris that may be ignited by sparks.
4. KEEP WORKAREACLEANAND WELL LIT: Cluttered, dark work areas invite accidents.
5. DO NOT USE ON STEPS.
6. DRESSPROPERLY:Donotwearlooseclothing.Thesemaybecaughtinmovingparts.Whenworkingwearglovesandinsulatednon-skid
footwear. Keep hands and gloves away from moving parts.
7. USE SAFETY EQUIPMENT: Proper eye protection should be worn at all times. Wear hearing protection during extended use and a dust
mask for dusty operations. Hard hats, face shields, safety shoes, etc. should be worn when specified or necessary.
8. KEEP BYSTANDERSAWAY: Children and other bystanders should be kept at a safe distance from the work area to avoid distracting the
operator and contacting the equipment or extension cord. Operator should be aware of the proximity of bystanders. This appliance is not
intendedforusebypersons(includingchildren)withreducedphysical,sensoryormentalcapabilitiesorlackofexperienceandknowledge.
Equipment is not to be used by children.
9. PROTECT OTHERS INTHE WORKAREA: Provide barriers or shields as needed to protect others from debris.
10. USE PROPER ACCESSORIES: Using accessories that are not recommended may be hazardous. Be sure accessories are properly
installed and maintained. Do not delete a guard or other safety device when installing an accessory or attachment.
11. CHECK FOR DAMAGED PARTS: Inspect guards and other parts before use. Check for misalignment, binding of moving parts, improper
mounting,brokenparts andotherconditionsthatmay affectoperation. If abnormalnoiseorvibration occurs,turnoffimmediately andhave
the problem corrected before further use. Do not use damaged equipment. Tag damaged equipment “DO NOT USE” until repaired. Miss-
ing or damaged parts should be properly repaired or replaced immediately. For all repairs, use only identical National replacement parts.
12. REMOVEALLADJUSTING KEYSAND WRENCHES: Make a habit of checking that the adjusting keys, wrenches, etc. are removed from
the tool before turning it on.
13. GUARDAGAINST ELECTRIC SHOCK: Prevent body contact with grounded surfaces such as pipes, radiators, ranges and refrigerators.
When making cuts, always check the work area for hidden wires or pipes. Hold your equipment by insulated nonmetal grasping surfaces.
Use a Ground Fault Circuit Interrupter (GFCI) to reduce shock hazards.
14. AVOID ACCIDENTAL STARTING: Be sure equipment is turned off before plugging in. Do not use a equipment if the power switch does
not turn the equipment on and off.
15. DO NOT FORCE EQUIPMENT: Equipment will perform best at the rate for which it was designed. Excessive force only causes operator
fatigue, increased wear and reduced control.
16. KEEP HANDSAWAY FROMALLCUTTING EDGESAND MOVING PARTS.
17. Wear gloves when changing accessories.
18. DO NOTABUSE CORD: Never unplug by pulling the cord from the outlet. Pull plug rather than cord to reduce the risk of damage. Keep
the cord away from heat, oil, sharp objects, cutting edges and moving parts.
19. DO NOT OVERREACH. MAINTAIN CONTROL: Keep proper footing and balance at all times. Maintain a firm grip.
20. STAY ALERT: Watch what you are doing, and use common sense. Do not use when you are tired, distracted or under the influence of
drugs, alcohol or any medication causing decreased control.
21. STARTING MACHINE: On/Off switch must be in off position before connecting to power source.
22. UNPLUG EQUIPMENT: When not in use and before changing accessories or performing recommended maintenance, unplug machine.
23. MAINTAIN EQUIPMENTCAREFULLY: Keep handles dry,cleanandfreefromoilandgrease.Keepcuttingedgessharpandclean.Follow
instructions for lubricating and changing accessories. Inspect tool cords and extension cords for damage. Replace damaged parts. Use

Safety
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Safety
only identical National replacement parts.
24. STORE IDLE EQUIPMENT: When not in use, store in a dry, secured place. Keep away from children.
25. MAINTAIN LABELSANDNAMEPLATES:These carry important information. If unreadable or missing, contact National for a replacement.
26. Machine is heavy, do not drop. Ensure proper lifting procedures are followed when transporting.
27. When operating machine, tether cord must be connected to operator.
28. DO NOTALLOW the oscilating plates to come into contact with the supply cord.
29. Regularly examine the supply cord for damage, such as cracking or aging. If damaged, replace the cord before further use. Only replace
the supply cord with the type specified in this manual.
CHARACTERISTICS OFADEFENSIVE OPERATOR
A Good Operator is a “Defensive” Operator!
QUALITIES INCLUDE:
Education: Educates themself on the machine and the environment.
Alert: Stays alert at all time and never lets guard down.
Skills: Only performs duties he/she is qualified to do.Always tries to improve.
Judgment: Use sound judgement. Does not take uncessary risks.
Common Sense:Applies knowledge in practical situations.
Recognizes the Hazards: Maintains alertness.Anticipates danger.
Understands the Defense: Knows that safety isn’t an accident…it’s a thinking person’s choice.
Acts Correctly: Does not give in to peer pressure. Performs correctly when supervised or not.
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WARNING: SILICA DUST WARNING GRINDING/CUTTING/DRILLING OF MASONRY, CONCRETE, METALAND OTHER MATERI-
ALS CAN GENERATE DUST, MISTSAND FUMES CONTAINING CHEMICALS KNOWN TO CAUSE SERIOUS FATAL INJURYOR ILLNESS,
SUCHAS RESPIRATORY DISEASE, CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM. IF YOUARE FAMILIAR WITH THE
RISKSASSOCIATED WITH THE PARTICULAR MATERIALBEING CUT, REVIEW THE MATERIAL SAFETYDATASHEETAND/
OR CONSULT YOU EMPLOYER, THE MATERIAL MANUFACTURER/SUPPLIER, GOVERNMENTALAGENCIES SUCHAS
OSHAAND NIOSHAND OTHERAUTHORITIES ON HAZARDOUS MATERIALS. CALIFORNIAAND SOME OTHERAUTHORI-
TIES, FOR INSTANCE, HAVE PUBLISHED LISTS OF SUBSTANCES KNOWN TO CAUSE CANCER, REPRODUCTIVE
TOXICITY, OR OTHER HARMFULEFFECTS. CONTROL DUST, MISTAND FUMES ATTHE SOURCE WHERE POSSIBLE. IN
THIS REGARD USE GOOD WORK PRACTICESAND FOLLOW THE RECOMMENDATIONS OF THE MANUFACTURER/SUP-
PLIER, OSHA/NIOSH,AND OCCUPATIONALAND TRADEASSOCIATIONS. WHEN THE HAZARDS FROM INHALATION OF
DUST, MISTS AND FUMES CANNOTBE ELIMINATED, THE OPERATORAND ANYBYSTANDERS SHOULDALWAYS WEAR
ARESPIRATORAPPROVED BY OSHA/MSHAFOR THE MATERIAL BEING CUT.

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FIG. A
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GROUNDING
Jobsite receptacles can vary. Check the voltage at different receptacles on the jobsite for
a more accurate voltage reading. 15 amp GFI outlets are not recommended.
GROUNDED TOOLS: TOOLS WITH THREE PRONG PLUGS
Equipment marked “Grounding Required” have a three wire cord and three prong
grounding plug. The plug must be connected to a properly grounded outlet (FigureA). If
the equipment 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.
The grounding prong in the plug is connected through the green wire inside the cord
to the grounding system in the equipment. The green wire in the cord must be the only
wire connected to the equipment’s grounding system and must never be attached to an
electrically “live” terminal.
The equipment must be plugged into an appropriate outlet, one which is properly
installed and grounded in accordance with all codes and ordinances. The plug and outlet
should look like the example in FigureA.
EXTENSION CORDS
Grounded equipment requires a three wire extension cord. Double insulated equipment
can use either a two or three wire extension cord.As the distance from the supply outlet
increases, you must use a larger diameter extension cord. Using extension cords with
inadequately sized wire causes a substantial drop in voltage, resulting in loss of power
and possible equipment damage.
The smaller the gauge number of the wire, the greater the capacity and larger diam-
eter of the cord. For example, a 10 gauge cord can carry a higher current than a 12
gauge cord. When using more than one extension cord to make up the total length, be
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 ampere and use the sum to
determine the required minimum wire size.
GUIDELINES FOR USING EXTENSION CORDS
• If you are using an extension cord outdoors, make sure it is marked with the suffix
“W-A” (“W” in Canada) to indicate that it is acceptable for outdoor use.
• Be sure your extension cord is properly wired and in good electrical condition.
Alwaysreplaceadamagedextension cord or have it repaired byaqualifiedperson
before using it.
• Protect your extension cords from sharp objects, excessive heat and damp or wet
areas.
WARNING: ELECTRICAL CORDS CAN BE HAZARDOUS. MISUSE CAN
RESULT IN FIRE OR DEATH BY ELECTRICALSHOCK. READ CAREFULLYAND
FOLLOWALLDIRECTIONS.
CAUTION: IMPROPERLY CONNECTING THE GROUNDING WIRE CAN RESULT
IN THE RISK OF ELECTRIC SHOCK. CHECK WITHA QUALIFIED ELECTRI-
CIAN IF YOUARE IN DOUBTAS TO WHETHERTHE OUTLET IS PROPERLY
GROUNDED. DO NOT MODIFYTHE PLUG PROVIDED WITH THE EQUIPMENT.
NEVER REMOVE THE GROUNDING PRONG FROMTHE PLUG. DO NOT USE
THE EQUIPMENT IFTHE CORD OR PLUG IS DAMAGED. IF THE PLUG WILL
NOT FITTHE OUTLET, HAVEAPROPER OUTLET INSTALLED BYAQUALIFIED
ELECTRICIAN.

Safety
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Safety
GUIDELINES FOR USING EXTENSION CORDS (CONTINUED)
• Keep away from water. Do not use if wet.
• Inspect thoroughly before each use. DO NOT USE IF DAMAGED.
• Make sure equipment is not running before disconnecting cord.
• FULLY INSERT plug into outlet.
• Do not remove, bend or modify any metal prongs or pins of cord.
• Do not use excessive force to make connections.
• Do not connect a three prong plug to a two-hole cord.
• Avoid overheating. Uncoil cord and do not cover it with any material.
• Do not walk on cord.
• Do not drive, drag or place objects over cord.
• Use a 12 gauge, 115v cord, 50ft maximum length with this machine. (Included with purchase.)
• Regularly examine the supply cord for damage, such as cracking or aging. If damage is found, replace the cord before further use.
• Only replace the supply cord with the type specified in the instruction manual.
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Machine Operation
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GENERAL OPERATION INFORMATION
1. Always wear eye protection.
2. Keep flammable and fragile objects away from the equipment.
3. Always check nuts and bolts to make sure they are tight.
4. Always use the machine with proper voltage specified in the machines nameplate.
5. Do not operate around water or wet conditions without use of GFI on cord (stock
#530 Circuit Guard).
6. Use properly grounded cord and receptacle.
7. Unplug from power before servicing or changing blades.
8. Use 12-3 or heavier wire cord, not exceeding 50 feet in length.
9. Do not force machine.
10. Do not alter machine.
11. Keep wheels free of debris.
12. Make sure blade is sharp.
13. Dropping machine onto cutting head could cause damage to blade holder or blade
and cause undue wear on bearing surface.
14. Removable handle and front weight makes machine portable (fits in a trunk of a
car).
15. Do not leave machine unattended while machine is running or plugged in.
TRANSPORTATION
ALWAYS REMOVE COUNTERWEIGHTAND BLADES BEFORE LOADING OR UNLOAD-
ING.
Machine breaks down for easy transportation:
• Handle removes (See Figure D)
• Handle and/or wheel angle can be lowered.
• Remove blade when not in use or transporting machine (See Figure E).
• Blades are sharp, use caution when handling blade.
FIG. A
FIG. B
WARNING: STAY CLEAR OF BLADE WHEN MACHINE IS OPERATING.
WARNING: KEEP HANDSAND FEET OUT FROM UNDERTHE MACHINE.

Machine Operation
FIG. A
ASSEMBLY
THE 550 COMES DISASSEMBLED.
1. Loosen both handle T-bolts on the handle frame.
2. Inserthandleintohandle frame (See FigureA)and adjust the handle tothedesired
height.
3. Retighten T-bolts on the handle frame (See FigureA).
WHEELADJUSTMENT
Adjusting the wheel angle will change the blade angle to the floor.Asteep wheel angle is
recommended on hard tear-outs such as tile over concrete.Alow wheel angle is recom-
mended for vinyl removal over plywood floors. These are estimations. Experiment with
the angle to see what works the best for the jobs application.
Rotate handle clockwise to raise wheels, counterclockwise to lower wheels to the desired
blade angle (See Figure B).
Note:Adjustment by trial at the beginning of a job will allow optimum performance.
HANDLEADJUSTMENT
AFTER THE PROPER WHEELADJUSTMENT ISACHIEVED,ADJUST THE HANDLE
No matter what the wheel angle is set at, the handle should be adjusted to the “belt-line”
of the operator or to what the operator is comfortable with. (See Figure C)
• Low setting works best on soft sub floors, plywood, luan, particleboard and wafer
board.
• Insomecases, a higher settingworksbestondirect glued down carpet,vinylortile
on concrete in some cases.
Make certain handle and bolts are secured tightly.
NOTE:Adjustment by trial at the beginning of the job will allow optimum performance.
MACHINE START PROCEDURE
1. Machine MUST be off before plugging machine into power source.
2. Plug machine into extension cord and/or outlet.
3. Turn switch ON.
FIG. B
FIG. C
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CAUTION: LOOSEN SWITCHAND BOLTS BEFORE TRYING TO RMEOVE THE
HANDLE.
WARNING: DO NOT OPERATE MACHINEAROUND EXCESSIVE MOISTURE
AREAS, SUCHASABATEMENT WORKAND FLOODED POOLAREAS.ALWAYS
USEAGFI WALL OUTLETOR PLUG (STOCK #530 CIRCUIT GUARD IS RECOM-
MENDED). FAILURE TO DO SO COULD CAUSE DAMAGE IN MACHINE OR INJURY
TO OPERATOR.
Angle
Adjustment
Wheel