National Flooring Equipent GP18 User manual

Read Manual Before Servicing Machine
402964 Rev C
GP18 PROPANE GRINDER
SERVICE MANUAL

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Table of Contents
1.0 Technical Data.............................................1
2.0 Safety Instructions .........................................2
3.0 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.0 Maintenance ..............................................8
5.0 Troubleshooting / Diagnostics ..............................12
6.0 Parts List and Diagrams ...................................13
Please note: The following safety instructions must be followed as
shown in this operating manual. Failure to do so may result in
hazard to health or possible death.

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1.0 Technical Data
1.1 Unit Specifications
1.2 Operative Range and Correct Usage
1.3 Stand-by Power Supply (Generator)
1.4 Advice for Operators of Grinding Machines
1.5 Machine Type Designation
1.1 Unit Specifications
GP18 Dimensions:
Length 72 in 183 cm
Width 28 in 71 cm
Height 53 in 135 cm
Weight 585 lbs 265 kg
1.2 Operative Range and Correct Usage
GP18 is designed to be used on clean, flat, dry or wet surfaces without obstacles. The
machine cannot be used for other purposes. The manufacturer will not be liable for
damages resulting from incorrect usage. In cases of incorrect usage, the user is responsible for
all risks.
1.3 Advice for Operators of Grinding Machines
During the operation of the GP18 it may be possible to exceed the acceptable noise
level of 85 dB(A). This is dependent on the different locations and the local circumstances.
When the noise level is 85 dB(A) or more, the machine operator and the persons working near
the machine must wear sound–insulating devices.
1.4 Machine Type Designation
Machine Type: GP18
Working Width: 28 in (71 cm)
Drive: Manual
Grinding Capacity: Variable
Dust Hose Connection: 3 in (76 mm) x 26 ft (8 m)

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2.0 Safety Instructions
2.1 Explanation of Warnings and Symbols
2.2 Organizational Measures
2.3 Personnel Selection and Qualification
2.4 Safety Precautions Applicable to Different Operating Conditions
2.5 Repair Work, Maintenance Activities, and Default Repair on the Job Site
2.6 Definition of the Safety-off Position
2.7 Dangerous Aspects of the Machine
2.8 Electrical Engineering Regulations
2.9 Special Instructions
2.1 Explanation of Warnings and Symbols
The following symbols are used in the operating instructions to highlight areas
of particular importance:
Operational Safety
This symbol will be shown next to all safety precautions that are to be taken in order to
ensure prevention of injury. Follow these instructions and take special care in these
circumstances. All general safety precautions and local accident prevention guidelines are also to
be followed. Please check whether there are special regulations for the particular jobsite.
Safety Goggles/ Ear Protection
Possible risks to persons or extensive material damages.
Electrical Warning
Warning against dangerous voltages.

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2.2 Organizational Measures
Operating Instructions must be kept near the machine and be reachable at all times.
In addition to the Operating Instructions, general and legal regulations regarding accident
prevention and environmental protection must be adhered to.
Such duties may, for example, relate to the handling of hazardous substances or to the provision
and wearing of personal protection equipment, as well as compliance with local traffic regulations.
The Operating Instructions must be supplemented by instructions regarding the duty to supervise
and report local working practices (e.g. work organization, work procedures, and personnel
allocation).
Personnel entrusted with working with the machine must have read the Operating Instructions
before starting the work. This particularly applies to incidental activities such as setting up the
machine, carrying out maintenance work, or training staff to work with the machine.
The working practices of the staff should be checked regularly, specifically regarding awareness of
safety and hazards.
Personnel must tie back long hair and not wear loose clothing or jewelry.
All safety and hazard notices on the machine must be kept complete and legible.
If safety-critical changes occur to the machine or its performance, the machine must be shut down
immediately! The cause of the fault has to be established immediately and the machine must be
repaired before starting the work again.
Changes, add-ons, or conversions of the machine which might have an influence to the
safety of the machine must not be undertaken without the permission of the manufacturer.
This applies in particular to the fitting and adjustment of safety devices and to welding on major
and load bearing parts.
Spare parts must always comply with the technical requirements and specifications of the
manufacturer. This is always guaranteed with original spare parts from the manufacturer.
Intervals for recurring inspections specified in these Operating Instructions must be complied with.
The location and the operation of fire extinguishers must be made known at each building site.
Take note of the facilities for fire reporting and fighting fires.

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2.3 Personnel Selection and Qualification
Only reliable personnel are allowed to operate the machine. Note the minimum age requirements.
Clearly specify the responsibilities of personnel for operation, setting up, servicing, and maintenance
work. Define responsibilities with regard to traffic safety regulations and allow personnel to decline
instructions from third parties which are not complying with the safety requirements.
Personnel being trained on the equipment may only be deployed under constant supervision of an
experienced person.
2.4 Safety Precautions Applicable to Different Operating Conditions
Avoid any method of working that impairs safety! All precautions have to be taken so that the
machine will only be used in a safe and functional status. Only operate the machine when all safety
devices, emergency stops, and suction devices are present and operational.
The machine has to be checked visually at least once a day for any damage and defects. In
the event of operational malfunctions, the machine must be shut down immediately and secured.
Cause must be determined before starting the machine again.
Secure a safety distance of at least 10 feet around the machine in public areas.
All persons in the proximity of the machine must wear safety glasses with lateral
protection and safety shoes. Ear protection may be required. The operator must wear
closely-fitted protective clothing.
Do not switch off or remove the exhaust and ventilation devices while machine is running!
2.5 Repair Work, Maintenance Activities, and Default Repair on the Job Site
Adjustments, servicing, inspection work, and inspection intervals specified in these Operating
Instructions as well as any information on the replacement on parts and systems of the machine
must be undertaken and complied with.
These activities can only be undertaken by qualified personnel. Before starting any maintenance
or repair work, the operator of the machine must be informed.
Start up and shut off procedures must be done in accordance with the Operating Instructions while
performing adjustments or maintenance to the machine.
For the machine to be shut off completely for maintenance, the propane tank valve must be closed
in order to prevent the machine from being switched on accidentally.
The dust bin of a connected dust collector has to be emptied before transportation. Handle in
accordance with the regulation on how to dispose and make sure that local regulations are met.
Do not use any aggressive cleaning materials! Use lint-free cleaning cloths.
Always tighten any screw connection that is undone during servicing and maintenance work.

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If safety devices need to be dismantled during setting up, servicing or repair work, these safety
devices must be reinstalled and inspected immediately after completion of the servicing or repair
work.
Make sure that process materials and replacement parts are disposed of safely and in an
environmentally-friendly manner!
Work on the electrical parts of the equipment may only be undertaken by a skilled
electrician or by a trained person under the guidance and supervision of a skilled
electrician as well as in accordance with the electrical engineering regulations.
Make sure that electrical components used for replacement purpose comply with the original parts
and are correctly adjusted if necessary.
2.6 Safety-off Position
The safety off position is the position of the machine when it cannot generate any hazard.
Putting the machine in the safety-off position means:
• Switch off the grinder.
• Switch off the dust collector.
• Wait for standstill of all drives.
• Turn off propane supply at tank and remove key from ignition.
• Secure the machine against unintended start up.
2.7 Dangerous Aspects of the Machine
Every machine, if it is not used according to the regulations, may be hazardous for
operating, setting-up and service personnel. The operating authority is responsible for
compliance with the safety regulations during operation and maintenance of safety devices
supplied with the machine as well as the provision of appropriate additional safety devices.
2.8 Electrical Engineering Regulations
Never start machine in the tilted position. The machine must only be started when all
guards and dust collection parts are attached and machine is standing flat on work
surface.
Use only extension cables for extending the main cable that are sized and marked in
accordance with the overall power consumption of the machine and the valid VDE
guidelines.
If work on electrified parts is necessary, a second person must be deployed. The working area
must be sealed with a red and white safety chain and a danger sign. Use tools that are insulated
against voltages.

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Only start work once you are familiar with the electrical engineering regulations that apply to your
area. Only use voltage testers that comply with the regulations when troubleshooting. From time to
time, check voltage testers to ensure that they are operationally efficient.
2.9 Special Instructions
Use only proper tools for your work. Damaged tools have to be repaired immediately or to be
replaced.
For your own safety, use the required safety equipment and safety clothes (e.g. safety glasses,
safety shoes, safety gloves).
Please instruct operators and repair personnel about the following points:
• Cleaning and repair work are only allowed if the machine is shut off (safety off position).
• During work on the machine, be certain that the machine cannot be started.
• Opening or removing safety devices while the machine is running is not allowed.
• Replace all safety covers and devices after cleaning, repair, and maintenance work.
• Do not touch moving parts or walk into the working path of the machine.
• Before restarting machine, make sure all personnel are a safe distance away from the work
area after initial start up.
3.0 General Information
3.1 Support Parts
3.2 Tool Change
3.3 Care & Maintenance

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3.1 Support Parts
Qty Part # Description
1 401923 Tool, EGT #00, DoublePCD/Diamond Sweep, Left
1 401924 Tool, EGT #00, DoublePCD/Diamond Sweep, Right
1 401925 Holder, Lipage, GP Series, Resin
1 401926 Adapter, EG, Velcro
1 401969 Screw, Hex Head Cap
1 402151 Dust Band, 82"
1 402350 Dust Skirt, 82"
1 402353 Kit, Repair, GP Grinders
1 402354 Bolt, Coupler, GP Grinders
1 402357 Tool, EGT #0S, 3 Segment Metal, Soft Bond, 24 Grit
1 402358 Tool, EGT #0H, 3 Segment Metal, Hard Bond, 24 Grit
1 402456 Kit, Maintenance, Propane
Qty Part # Description
1 401454 Coupler, Morflex, 6"
1 401455 EG Female Adapter Quick Change
1 401456 Combination Tool Holder, GP Grinders
1 401457 Woodruff Key
1 401466 Diamond, Org 2 Seg 25/30 Grit
1 401900 Diamond, PMW #1, 6mm Metal Bond
1 401901 Diamond, PMW #2, 6mm Metal Bond
1 401902 Diamond, PMW #3, 6mm Resin Bond
1 401903 Diamond, PMW #4, 8mm Resin Bond
1 401904 Diamond, PMW #5, 8mm Resin Bond
1 401905 Diamond, PMW #6, 3mm Resin Bond
1 401906 Diamond, PMW #7, 3mm Resin Bond
1 401907 Diamond, EGT #1, 8mm Metal Bond, 40 Grit
1 401908 Diamond, EGT #2, 8mm Metal Bond, 80 Grit
1 401909 Diamond, EGT #3, 8mm Metal Bond, 150 Grit
1 401910 Diamond, EGT #4, 6mm Resin Bond, 100-200 Grit
1 401911 Diamond, EGT #5, 3mm Resin Bond, 200-400 Grit
1 401912 Diamond, EGT #6, 3mm Resin Bond, 400-800 Grit
1 401913 Diamond, EGT #7, 3mm Resin Bond, 800-1800 Grit
1 401914 Diamond, EGT #8, 3mm Resin Bond, 1800-3000 Grit
1 401915 Diamond, Classic #1, 8mm Metal Bond, Dry
1 401916 Diamond, Classic #2, 6mm Metal Bond, Wet
1 401917 Diamond, Classic #3, 6mm Resin Bond, Wet
1 401918 Diamond, Classic #4, 6mm Resin Bond, Wet
1 401919 Diamond, Classic #5, 3mm Resin Bond, Dry
1 401920 Diamond, Classic #6, 3mm Resin Bond, Dry
1 401921 Diamond, Classic #7, 3mm Resin Bond, Dry
1 401922 Tool, EGT #0, 3 Segment Metal Bond, Prep, 24 Grit

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3.2 Tool Change
In order to change the tools, the operator must first ensure that the grinder is switched off and the
propane tank valve is closed. The operator should then place all the pocket weights provided in the
weight holders on either side of the variable speed drive.
Then push machine down by the handle in a controlled manner until the grinder is resting on the
top casters. The operator then taps the tools from the outside edging to remove, and installs new
tools by sliding the tooling outward.
Machine must only be tilted back on firm, level surface. There is danger of machine
falling if all weights are not used and surface is not level.
3.3 Care & Maintenance
Regular maintenance of the machine and its parts are imperative for functioning and safety.
In order to prevent unnecessary downtimes, it is recommended to keep original spare and wear
parts on stock.
The following maintenance should take place before and after every operation of
machine:
1. Clean all surfaces with a dry, lint-free cloth
2. Check all electrical connections are secure
3. Inspect gear box for any signs of oil leakage
4. Verify functionality of Dead Man Key.
All persons in the proximity of the machine in operation must wear safety glasses with
lateral protection and steel-toed work boots. The machine operator must wear close-
fitting protective clothing.
4.0 Maintenance
4.1 Recommendations
4.2 Maintenance and Inspection
4.3 Maintenance
4.4 Regular Wear Parts
4.5 Service Schedule
4.1 Recommendations
Prior to any repair work on the machine and its drives, secure machine against uninten-
tional switch-on. Put the machine in Safety Off Position as described in chapter 2.

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Failures due to inadequate or incorrect maintenance may generate very high repair costs and
long idle periods for the machine. Regular maintenance is essential. Safety and service life of the
machine depend, among other things, on proper maintenance.
The following table will show recommendations about time, inspection and maintenance for the
normal use of the machine. The time indications are based on uninterrupted operation. When the
indicated number of working hours is not achieved during the corresponding period, the period can
be extended. Due to different working conditions it cannot be foreseen how frequently inspections
for wear checks, inspection, maintenance and repair works ought to be carried out. Prepare a
suitable inspection schedule considering your own working conditions.
4.2 Maintenance and Inspection
Operating Hours / Time Period Inspection Points / Maintenance Instructions
Daily — Prior to Operation • Check all electrical cables for cuts or damage.
• Check the hose connections for tightness and fixed seat.
• Check the hose to the dust collector for damage.
• Make sure that the dustbin of the dust collector has been
dumped.
• Check Morflex Coupler, tool plate, and diamond tooling
for wear and damage.
• Check that shroud and rubber seal are in good working
condition.
• Check the electric connections for sediments of dirt or
foreign bodies.
• Check the electric motor for dirt and other contaminants.
• Check gearbox assembly for any leaks of oil from motor
and top and bottom of gear box.
Daily — After Operation • Check for debris, if any, in the dust ports under gear box
as well as at handle.
4.3 Maintenance
Stock all spare or wear parts that cannot be supplied quickly. As a rule, production standstill periods
are more expensive than the cost for the corresponding spare part.
Screws that have been removed must be replaced with those of the same quality (strength,
material) and design.
Prior to any repair work on the machine and its drives, secure the machine against
unintentional start-up. Pull out the main plug in order to do this. Store the plug near the
machine to avoid accidents.

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4.4 Worn or Damaged Parts
To replace a worn or damaged Morflex Coupler perform the following:
1. Remove ½"-20 bolts from drive plate using a ½" impact wrench and ¾" socket.
2. Use pry tool to remove assembly from drive plate.
3. Remove ½"-20 bolts from tool plate using a ½". impact wrench and ¾". socket.
4. Use pry tool to remove coupler from tool plate.
5. Replace with new coupler.
6. Replace bolts through new coupler and into tool plate* tighten with impact wrench.
7. Place tool plate assembly onto drive plate with bolts* tighten with impact wrench.
* When replacing bolts, be sure to hand start bolts BEFORE using impact wrench to tighten down.
This minimizes the risk of stripping the threads by tightening an unseated bolt.
4.5 Service Schedule
OPERATION INTERVAL
Daily First 8
Hrs.
Every
50 Hrs.
Every
100 Hrs.
Every
200 Hrs.
Every
300 Hrs.
Every
400 Hrs.
Every
500 Hrs.
Check & add engine oil •
Check for loose or lost fasteners •
Check for oil leakage •
Inspect fuel hose and connections •
Clean Engine dust filter •
Inspect pad driver •
Change Engine Oil • •
Change engine oil filter • •
Check & clean primary air filter •
Check secondary air filter •
Inspect battery and battery connections •
Replace Engine primary air filter •
Replace Engine pre-filter •
Inspect, clean, & re-gap spark plugs,
Replace if necessary •
Check & adjust valve clearance *
Retorque heads * •
Clean & lap valve seating surface * •
Check engine emissions •
Check oil level in front gearboxes •
Inspect drive belt •
Replace drive belt As Required
* Contact a Certified Technician

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5.0 Troubleshooting / Diagnostics
5.1 Diagnosis of Failures
5.1 Diagnosis of Failures
Failure Possible Reasons for Failure Corrective Actions
Unusual Vibrations Uneven or loose surface being
ground
Verify suitability of substrate being
ground.
Loose or damaged tooling Inspect tooling to make sure that
all connecting hardware is tight
and tool is firmly seated to holder.
Damaged or worn coupler Replace coupler.
Unusual Noise Uneven or loose surface being
ground
Verify suitability of substrate
being ground.
Loose or damaged tooling Inspect tooling to make sure that
all connecting hardware is tight
and tool is firmly seated to holder.
Shroud is dragging on the floor Adjust shroud and tighten to no
more than ¼" (6.35 mm) above
floor.
Reduced performance
or no performance
Diamond tooling is worn or
damaged
Inspect diamond tooling for
remaining abrasive. If depleted,
replace with new tooling.
Dust being produced Shroud is out of adjustment Adjust shroud and tighten to no
more than .08" (2 mm) above
floor.
Dust hose is clogged Inspect dust hose and ports for
debris that may be clogging hose.
Dust collector malfunction Verify dust collector is operating
properly.
Motor does not start up Faulty switch or relays Get diagnosis and replacement
by a skilled electrician.
Emergency stop Unlock the emergency stop
button.
Motor stops during
operation
Out of propane Replace propane tank.
Motor is damaged Inspect motor.

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6.0 Parts List and Diagrams

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Warranty
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. Ac-
cessories or equipment furnished and installed on the product by the Company but manufactured by others, including but not limited to:
engines, motors, electrical components, 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 asso-
ciated 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 negli-
gence of seller and / or the manufacturer 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 representa-
tive. 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 defec-
tive 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 AUTHORIZA-
TION 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: ____________________________________________