National Flooring Equipment 8274-4 User manual

Read Manual Before Operating Machine
402902 Rev B
8274-4 PLANETARY GRINDER
OPERATING MANUAL

Table of Contents
3
Contents
Table of Contents ................................................................................................................................................................................................... 3
Features and Specications.................................................................................................................................................................................. 4
Safety....................................................................................................................................................................................................................... 6
Components and Assembly .................................................................................................................................................................................. 7
Loading and Unloading................................................................................................................................................................................. 7
Handle Assembly.......................................................................................................................................................................................... 7
Vacuum Port ................................................................................................................................................................................................ 7
Rubber Dust Guard....................................................................................................................................................................................... 7
Magnetic Tooling Holder Installation............................................................................................................................................................. 8
Pre-Production Safety Checks...................................................................................................................................................................... 8
Operation................................................................................................................................................................................................................. 9
Start-Up Procedure....................................................................................................................................................................................... 9
Shut-Down Procedure .................................................................................................................................................................................. 9
Accessory Set-Up......................................................................................................................................................................................... 9
Accessory Attachment ................................................................................................................................................................................ 10
Troubleshooting Guide .........................................................................................................................................................................................11
Warranty ................................................................................................................................................................................................................ 13

Features and Specications
4
FEATURES
Product Specications
Width Height
(Min.-Max.)
Length
(Min.-Max.) Weight Disc Size Power / Frequency HP Motor
20” (51 cm) 27.5-52”
(70-132 cm)
38.5-75”
(98-190.5 cm)
388 lbs
(176 kg) 18.5” (47 cm) 120 V / 60 Hz, single phase input 33-Phase operation
Adjustable Handle - Adjusts in three separate locations for operator
comfort.
Dust Collector Port - Located in the back of the machine to ensure
hose will not disrupt production.
Flip Style Weights - Allows operator to easily add down pressure
when required.
90°Rotating Grinder Deck - Grants easy access to the quick-change
magnetic tooling.
Control Box - Self-diagnoses and minimizes blown circuit breakers
with a variable speed feature.
Adjustable Rubber Dust Guard - Provides a dustless operation.
15A/20A Switch - This machine normally runs on 20A; however, the
switch on the side of the control box allows the operator to run the
machine on 15A when there is a limited power supply.
Adjustable Handle
90° Rotating Grinder
Deck
Control Box
Adjustable Rubber
Dust Guard
Dust Collector Port
Flip Style Weights
T-Bolts
(for head removal)
15A/20A Switch

Safety
Environment
Avoid use in dangerous environments.
Do not use in rain, damp or wet locations, or in the presence of
explosive atmospheres (gaseous fumes, dust, or ammable mate-
rials). Remove materials or debris that may be ignited by sparks.
Keep work area tidy and well-lit - a cluttered or dark work area may
lead to accidents. Extreme heat or cold may affect performance.
Protect others in the work area and be aware of surroundings.
Provide barriers or shields as needed to protect others from debris
and machine operation. Children and other bystanders should be
kept at a safe distance from the work area to avoid distracting the
operator and/or coming into contact with the machine. Operator
should be aware of who is around them and their proximity. Sup-
port personnel should never stand next to, in front of, or behind
the machine while the machine is running. Operator should look
behind them before backing up.
Guard against electric shock.
Ensure that machine is connected to a properly grounded outlet.
Prevent bodily contact with grounded surfaces, e.g. pipes, radia-
tors, ranges, and refrigerators. When scoring or making cuts,
always check the work area for hidden wires or pipes.
5
GENERAL RULES FOR SAFE OPERATION
Before use, anyone operating or performing maintenance on this equipment must read and understand this manual, as well as any labels pack-
aged with or attached to the machine and its components. Read the manual carefully to learn equipment applications and limitations, as well
as potential hazards associated with this type of equipment. Keep manual near machine at all times. If your manual is lost or damaged, contact
National Flooring Equipment (NFE) for a replacement.
Personal
Dress properly and use safety gear.
Do not wear loose clothing; it may be caught in moving parts.
Anyone in the work area must wear safety goggles or glasses,
hearing protection during extended use, and a dust mask for dusty
operations. Hard hats, face shields, safety shoes, etc. should be
worn when specied or necessary.
Maintain control; stay alert.
Keep proper footing and balance, and maintain a rm grip.
Observe surroundings at all times and use common sense. Do not
use when tired, distracted, or under the inuence of drugs, alcohol,
or any medication that may cause decreased control.
Keep hands away from all moving parts and tooling.
Wear gloves when changing tooling. Remove tooling when ma-
chine is not in use and/or lower cutting head to the oor.
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.
Equipment
Use proper parts and accessories.
Only use NFE-approved or recommended parts and accessories.
Using any that are not recommended may be hazardous.
Ensure accessories are properly installed and maintained.
Do not permanently remove a guard or other safety device when
installing an accessory or attachment.
Inspect for damaged parts.
Check for misalignment, binding of moving parts, loose fasteners,
improper mounting, broken parts, and any other conditions that
may affect operation. If abnormal noise or vibration occurs, turn
the machine off immediately. Do not use damaged equipment until
repaired. Do not use if power switch does not turn machine on and
off. For all repairs, insist on only identical NFE replacement parts.
Maintain equipment and labels.
Keep handles dry, clean, and free from oil and grease. Keep cut-
ting edges sharp and clean. Follow instructions for lubricating and
changing accessories. Motor and switches should be completely
enclosed at all times with no exposed wiring. Inspect cord regu-
larly. Labels carry important information; if unreadable or missing,
contact NFE for a free replacement.
Avoid accidental starting; store idle equipment.
When not in use, ensure that the machine is unplugged; do not
turn on before plugging in. Store in a dry, secured place. Remove
tooling when storing, and keep away from children.
Maintenance & Repairs
Begin maintenance work only when the machine is shut
down, unplugged, and cooled down.
Use proper cleaning agents.
Ensure that all cleaning rags are ber-free; do not use any aggres-
sive cleaning products.
Schedule regular maintenance check-ups.
Ensure machine is properly cleaned and serviced. Remove all
traces of oil, combustible fuel, or cleaning uids from the machine
and its connections and ttings. Retighten all loose ttings found
during maintenance and repair work. Loose or damaged parts
should be replaced immediately; use only NFE parts.
Do not weld or ame-cut on the machine during repairs, or
make changes to machine without authorization from NFE.
CAUTION! ENSURE PROPER USE OF EXTENSION CORDS. IF AMP DRAW IS HIGHER THAN SHOWN ON
TABLE OR CORD IS LONGER THAN 50 FT, SEE AN ELECTRICIAN.
ASSUMPTIONS: 3% ALLOWABLE VOLTAGE DROP, COPPER CONDUCTORS RATED FOR 75OC, 1.25
SAFETY FACTOR, CORD VOLTAGE RATING OF 600VAC, PROPER CORD TYPES (STO, STOW, SOOW).
Amp Draw Gauge
0-12 14
13-16 12
14-24 10
25-40 8
55

Safety
GRINDER SAFETY GUIDELINES
Before use, anyone operating this equipment must read and understand these safety instructions.
6
WARNING: GRINDING/CUTTING/DRILLING OF MASONRY, CONCRETE, METAL AND OTHER MATERIALS CAN GENERATE DUST,
MISTS AND FUMES CONTAINING CHEMICALS KNOWN TO CAUSE SERIOUS FATAL INJURY OR ILLNESS, SUCH AS RESPIRATORY
DISEASE, CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM. IF YOU ARE UNFAMILIAR WITH THE RISKS ASSOCIATED
WITH THE PARTICULAR MATERIAL BEING CUT, REVIEW THE MATERIAL SAFETY DATA SHEET AND/OR CONSULT YOU EMPLOYER,
THE MATERIAL MANUFACTURER/SUPPLIER, GOVERNMENTAL AGENCIES SUCH AS OSHA AND NIOSH AND OTHER
AUTHORITIES ON HAZARDOUS MATERIALS. CALIFORNIA AND SOME OTHER AUTHORITIES, FOR INSTANCE, HAVE
PUBLISHED LISTS OF SUBSTANCES KNOWN TO CAUSE CANCER, REPRODUCTIVE TOXICITY, OR OTHER HARMFUL
EFFECTS. CONTROL DUST, MIST AND FUMES AT THE SOURCE WHERE POSSIBLE. IN THIS REGARD USE GOOD
WORK PRACTICES AND FOLLOW THE RECOMMENDATIONS OF THE MANUFACTURER/SUPPLIER, OSHA/NIOSH,
AND OCCUPATIONAL AND TRADE ASSOCIATIONS. WHEN THE HAZARDS FROM INHALATION OF DUST, MISTS AND
FUMES CANNOT BE ELIMINATED, THE OPERATOR AND ANY BYSTANDERS SHOULD ALWAYS WEAR A RESPIRATOR
APPROVED BY OSHA/MSHA FOR THE MATERIAL BEING CUT.
Grinding
Beware of hidden obtrusions.
Watch out for hidden dangers and protrusions in ooring. Do not
use on largely uneven surfaces.
Avoid contact with hot tooling and shroud.
Do not touch the tooling or shroud without proper hand protection.
Both become hot during operation and remain hot after stopping
the machine.
Use correct tooling and accessories.
Provide barriers or shields as needed to protect others from debris.
Use for correct applications.
Do not force equipment to do heavier duty work than it was made
for.
Do not block the machine’s air ow.
Blocking ventilation slots or air ow will result in damage to the
machine. Leave space for air to ow freely during operation.
Use dead man cable during operation.
Loss of control of the grinder could cause damage, injury, or death.
Dust Collection
Use with appropriate dust collecting system.
Do not operate machine designed for use with a dust collector
without the dust collector. Ensure dust collector is on and operating
properly while grinding.
Use with appropriate dust collection hose.
Do not operate the machine without the hose securely attached to
the inlet of the dust collector and the outlet of the grinder. In order
to maintain system efciency, do not use a damaged hose.
Dispose of collected waste.
Do not leave the dust collector bag full of waste. Handle and
dispose of bag and waste in accordance with all applicable local,
state, and federal regulations. Dispose of waste prior to transport.
Safety
Battery (Propane Machines Only)
Remove personal metal items when working with battery.
A battery can produce a short circuit current sufcient enough to
weld metal objects, causing severe burns. Be careful to not drop
metal tools on the battery, as a spark or short circuit could cause
an explosion.
Never smoke or allow a spark or ame near the battery.
WARNING: BE CAUTIOUS WHEN WORKING WITH
BATTERY. IF ELECTROLYTIC ACID GETS IN THE EYES,
IMMEDIATELY FLUSH OUT WITH COLD, FRESH WATER
FOR AT LEAST 10 MINUTES AND GET MEDICAL HELP.
Safety
6
Safety
6

Components and Assembly
7
LOADING AND UNLOADING
• Always disconnect from power source before transporting.
• Ensure blanks are installed in magnetic tooling pockets during transport.
• Loosen handle securing bolt to slide handle down for loading/unloading. Re-tighten
the bolts when handle is at the desired height.
HANDLE ASSEMBLY
Handle adjusts in both height and angle. To make adjustments, complete the following:
1. Loosen the handle bolt and adjust the handle to the desired length (Figure 1); re-
tighten bolt.
2. Adjust handle grip to desired angle and rmly secure (Figure 1.1).
3. Adjust handle to desired angle and secure with clip and support pin (Figure 1.2).
VACUUM PORT
The machine has a dust collection port located at the rear (Figure 2A). Use a dust col-
lection hose that snugly ts either on the outside or the inside of the port. The dual short
hose connection runs from the grinder deck to the ‘Y’ splitter (Figure 2B).
RUBBER DUST GUARD
Attaching
1. Ensure machine is in upright position.
2. Attach dust guard (Figure 3), keeping as close to the oor as possible.
Note: If dust is exposed when operating machine, stop machine and readjust
dust guard.
FIG. 1
FIG. 1.1
FIG. 1.2
FIG. 2
CAUTION: HANDLE MUST BE SECURED WITH BOTH BOLTS; BE AWARE OF
ROTATING WEIGHTS. FAILURE TO DO SO COULD CAUSE SERIOUS INJURY.
WARNING: MAKE SURE TO USE THE PROPER INDUSTRIAL HEPA DUST
COLLECTOR BASED ON THE TYPE OF SURFACE APPLICATION. FAILURE
TO DO SO COULD RESULT IN EMISSIONS OF HAZARDOUS PARTICULATES.
ENSURE THE SYSTEM BEING USED COMPLIES WITH OR EXCEEDS OSHA
RECOMMENDED STANDARDS. THE RUBBER DUST GUARD MUST BE SECURE
AND COVER ALL THE WAY TO THE FLOOR SURFACE.
WARNING: NEVER OPERATE THE MACHINE WITHOUT THE RUBBER DUST
GUARD PROPERLY IN PLACE. ENSURE DUST GUARD FORMS A SEAL FROM
THE GRINDER DECK TO THE FLOOR. FAILURE TO DO SO COULD CAUSE
SERIOUS HARM TO THE OPERATOR AND/OR THOSE IN PROXIMITY OF THE
GRINDER. NEVER MOUNT OR RE-ADJUST THE RUBBER DUST GUARD WITH
THE MACHINE PLUGGED IN. DISCONNECT MACHINE FROM POWER SOURCE
BEFORE MAKING ADJUSTMENTS.
B
A
FIG. 3

Components and Assembly
FIG. 4
Positioning
1. Unplug machine from power source.
2. With machine sitting in the operating position, remove rubber dust guard held on
by Velcro.
3. Starting at one end of the shroud, place guard to rest on oor surface.
4. Firmly press rubber guard into securing Velcro on shroud.
5. Wrap rubber guard all the way around the shroud, making sure the guard rests on
the oor surface and is secure (Figure 3).
6. Inspect for air gaps between dust guard and oor.
Note: If guard-securing Velcro becomes loaded up with debris, wash out with mild soap
or blow out with an air hose. If Velcro on the machine is damaged or worn out, replace
before using the machine. If the rubber guard is cut, damaged or worn out, replace
before using the machine.
WEIGHTS
Weights rotate front to back.
• To apply added weight, one or or both weights can be rotated forward (Figure 4).
• To take load off machine, pull weights to the back (Figure 4.1).
• If circuit breakers trips at the power source, pull weight(s) to the back to reduce
head pressure.
PRE-PRODUCTION SAFETY CHECKS
Prior to starting the grinder, complete the following safety checks:
• Ensure all morex coupler assemblies and magnetic tooling plates are securely
fastened.
• Clean any dust or debris from the magnetic tooling holders prior to installing tooling
or Velcro adapter plates.
• Ensure the dust guard is properly in place by forming a seal from the grinder deck
to the surface of the oor being prepared.
• Attach the tether cord to both the machine and the operator.
FIG. 4.1
8

Operation
9
START-UP PROCEDURE
1. Plug the controller into a properly sized extention cord (see Safety).
2. Plug the extension cord into an adequate power supply.
3. Attach the control box safety tether to the operator’s wrist.
4. Move the FWD/REV toggle switch to the desired “forward” or “reverse” position.
(Figure 5A)
5. The operator should apply a light amount of pressure to the grinder handle to re-
lieve the initial torque created when starting the machine.
6. Move the power toggle switch to the “ON” position (Figure 5B).
SHUT-DOWN PROCEDURE
To turn the grinder off move the toggle switch to the “OFF” position.
ACCESSORY SET-UP
When grinding, down pressure relates to two aspects: (1) the amount of weight on the
machine, and (2) the surface area the weight is being distributed across.
• If tooling with a smaller segment is used, the amount of down pressure applied at
the point of contact is increased.
• Larger segments of tooling will decrease the amount of down pressure.
Down pressure will directly affect production rates and of prole achieved. If more down
pressure is desired, insert the tooling segments into two of the four magnetic pockets. Be
sure to insert the tooling into the magnetic pockets directly across from one another.
The machine is designed to run in forward or reverse for most applications:
• With the grinder switch in “forward,” the tooling should turn clockwise and the drum
should turn opposite (Figure 6).
• With the grinder switch in “reverse,” the tooling should turn counterclockwise and
the drum should turn opposite (Figure 7).
Note: PCDs and carbides can only be used in forward motion.
FIG. 6
FIG. 5
A
B
FIG. 7

Operation
FIG. 8
ACCESSORY ATTACHMENT
1. Tilt motor back to expose the underside of the machine.
2. Clean foreign material from magnet prior to tooling installation.
3. Place the individual tooling segments into two or four of the magnetic pockets. Be
careful around pinch points, as the tooling segments will snap into place as the
magnetic connection is made (Figure 8).
4. For safety, depending on the condition of the surface being prepared, the individual
tooling segments should be attached to the magnetic tooling holders using a single
mounting screw for each segment.
Note: Use blanks in unused magnetic tooling pockets.
Attaching The Velcro Plate Adapter
The Velcro plate adapter attaches magnetically to the Magnetic tooling plate and snaps
into place (Figure 9).
Mounting Brazed Diamond and Polishing Pads
The brazed diamond and polishing pads are attached to the Velcro adapter plates (Fig-
ures 10; 11).
Mounting PCD’s
PCD’s are mounted to the holder (Figure 12) with tooling screws. The holder and PCD’s
are not magnetic, but are attached to the magnetic plates.
Note: When setting the machine down into the operating position, hold the machine
rmly and set it down gently.
FIG. 10
FIG. 12
FIG. 11
10
FIG. 9
WARNING: WHEN ACCESSORIES ARE EXPOSED, NEVER OPERATE
MACHINE. SERIOUS INJURY AND POSSIBLE PLATE DISENGAGEMENT COULD
OCCUR.
9241
Assembly
9245
Adapter
TOOL HOLDER & VELCRO ADAPTER
CAUTION: DAMAGE TO ACCESSORIES AND MACHINE COULD OCCUR IF
DROPPED.

Troubleshooting Guide
11
Fault Code
Status Light Fault Description Problem Solution
SOLID ON Check safety tether Safety tether is disconnected
from controller or faulty con-
nection internally with tether
switch.
Attach safety tether to control box. If
necessary, check connections inside
controller. Ensure control box is discon-
nected from power source prior to
opening control box.
2 FLASHES Power line voltage too low Not enough power coming
into controller to start or run
grinder.
Be sure to use the appropriate exten-
sion cord (see Safety) and/or generator
(10 kW, 115V if applicable).
3 FLASHES Power line voltage too high Excessive power coming into
controller.
Ensure grinder is plugged into an outlet
and/or generator (if applicable) with the
appropriate voltage.
4 FLASHES Motor short circuit or overload Motor may be overheating
due to using too long of an
extension cord or because the
outlet/generator is the wrong
voltage.
Allow motor to cool before resetting fault
code. Reduce amp draw by removing
weights from grinder deck and/or reduc-
ing motor’s RPM. Ensure use of proper
extension cord, outlet, and/or generator.
5 FLASHES Controller overheating Internal components of con-
troller are too hot.
Ensure external fan is plugged into con-
troller and is working properly. Reduce
amp draw by removing weights from
grinder deck and/or reducing motor’s
RPM.
6 FLASHES Open motor phases No power from controller
motor.
Ensure motor is properly connected to
control box.
NO FLASHING
LIGHTS or ANY
LIGHTS AT ALL
No illuminated status lights or
fault codes
Reset power supply circuit
breaker if necessary; if the
power source is working, it
is likely the fuse inside the
control box is blown.
Prior to opening control box, ensure it is
disconnected from power source. Wait
30 seconds for power to discharge from
capacitors after disconnecting. Replace
fuse.
Note: For additional maintenance and repair information, reference this machine’s Service Manual.

Warranty
13
National Flooring Equipment Inc. (referred to as “the Company”) warrants that each new unit manufactured by The Company, to be free from
defects in material and workmanship in normal use and service for a period of twelve (12) months from date of shipment from the Company. For
administrative ease, will honor warranty for a period of fteen (15) months from date of shipment from the company. Accessories or equipment
furnished and installed on the product by the Company but manufactured by others, including but not limited to: engines, motors, electrical com-
ponents, transmissions etc., shall carry the accessory manufacturers own warranty. Battery warranties are prorated over the warranty period.
Customer is responsible for the inspection of equipment / parts upon delivery. Freight damages reported beyond authorized time frame will not
be honored.
The Company, at its determination of defect, will repair or replace any product or part deemed to be defective in material or workmanship within
specied warranty time period. All product determinations and / or repairs will take place at the designated Company repair facility, or at a certi-
ed warranty location designated by the Company. The Company will coordinate and be responsible for all freight expenses associated with
valid warranty claims. Freight and shipping expenses associated with abuse or misuse will be back charged to the Distributor/Customer. The
Company reserves the right to modify, alter or improve any part / parts without incurring any obligation to replace any part / parts previously sold
without such modied, altered or improved part / parts. In no event shall the seller or manufacturer of the product be liable for special, incidental,
or consequential damages, including loss of prots, whether or not caused by or resulting from the negligence of seller and / or the manu-
facturer of the product unless specically provided herein. This warranty shall not apply to any products or portions there of which have been
subjected to abuse, misuse, improper installation or operation, lack of recommended maintenance, electrical failure or abnormal conditions and
to products which have been tampered with, altered, modied, repaired, reworked by anyone not approved or authorized by the Company or
used in any manner inconsistent with the provisions of the above or any instructions or specications provided with or for the product. Any and
all unauthorized onsite warranty work conducted by unauthorized personnel or any outside person(s), is not covered by the Company unless
the work has been pre-authorized by a predetermined manufacturer representative. This excludes wearable parts and/or consumables.
Defective or failed material or equipment shall be held at the purchaser’s premises until authorization has been granted by the Company to
return or dispose of defective products. Products returned for nal inspection must be returned with a manufacturer authorized Return Material
Authorization (RMA). Any unauthorized return of equipment will be declined at the dock by the Company. Any non-approved items returned
with approved returned items are subject to rejection and will not be credited. Credit will be issued for material found to be defective upon the
Company’s inspection based on prices at time of purchase.
TO OBTAIN SERVICE CONTACT NATIONAL FLOORING EQUIPMENT, INC. TOLL FREE AT 800-245-0267 FOR A REPAIR
AUTHORIZATION NUMBER. COD FREIGHT RETURNS WILL NOT BE ACCEPTED. FREIGHT COLLECT SHIPMENTS WILL
NOT BE ACCEPTED. WARRANTY REPAIRS MUST BE ACCOMPANIED BY DATE OF PURCHASE RECEIPT AND A RETURN/
REPAIR AUTHORIZATION NUMBER.
RETURN/REPAIR AUTHORIZATION NUMBER: _____________________________
MACHINE SERIAL NUMBER: ____________________________________________

9250 Xylon Avenue N • Minneapolis, MN 55445 • U.S.A.
Toll-free 800-245-0267 • Phone [phone] • Fax [phone] • Fax [phone]
Web Site: www.nationalequipment.com • E-Mail: [email protected]