National Flooring Equipent GP30 User manual

Read Manual Before Servicing Machine
402977 Rev D
GP30 GRINDER
SERVICE MANUAL

2
Table of Contents
1.0 Technical Data.............................................1
2.0 Safety Instructions .........................................2
3.0 Parts.....................................................6
4.0 Maintenance ..............................................7
8.0 Troubleshooting / Diagnostics ...............................8
9.0 Parts List and Diagrams ...................................10
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.

1
1.0 Technical Data
1.1 Rating
1.2 Unit Specifications
1.3 Machine Type Designation
1.1 Rating
Machine: GP30 Grinder
Manufacturer: National Flooring Equipment (NFE)
9250 Xylon Ave. N
Minneapolis, MN 55445
1.2 Unit Specifications
Dimensions:
Length 86 in 218 cm
Width 30 in 76 cm
Height 52 in 132 cm
Weight 1,320 lbs 599 kg
Connected loads of the electrical system:
Power 30 HP
Electrical Connection 220/230 VAC 3-Phase 60 Hz
1.3 Machine Type Designation
Machine Type: GP30
Working Width: 30 in (72cm)
Drive: Manual
Grinding Capacity: Variable
Dust Hose Connection: 3 in (76mm) x 25 ft (8m)

2
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 Jobsite
2.6 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 this manual to highlight areas of particular
importance:
Operational Safety
Safety precautions that are to be taken to ensure prevention of injury.
Safety Goggles / Ear Protection
Information, instructions, and restrictions with regards to possible risks to persons or
extensive material damages.
Electrical Warning
Warning against dangerous voltages.
2.2 Organizational Measures
The Operating Instructions are to be kept near where the machine is located and must
be reachable at all times.
In addition to this manual, general and legal regulations regarding accident prevention and
environmental protection must be complied with. These 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. This manual must be supplemented by instructions
containing the duty to supervise and report particular local working practices, work organization,
work procedures, and personnel allocation.
Personnel working with or on the machine must have read this manual before starting work; in
particular the section on safety.
From time to time the working practices of the staff are to be checked for awareness of safety and
hazards.

3
Personnel must tie back long hair and not wear loose clothing or jewelry. There is a risk of injury if
loose items become stuck or are drawn into moving machinery.
Use personal protection equipment if necessary or required by regulations. Take notice
of all safety and hazard notices on the machine.
All safety and hazard notices on the machine must be kept complete and legible. For replacement
labels, contact NFE.
If safety-critical changes occur to the machine or its performance, the machine must be shut down
immediately! The cause of the fault must be established and repaired before starting the work
again.
Changes, add-ons, or conversions to the machine which might have an influence on the
safety of the machine must not be undertaken without the permission of the manufacturer.
Spare parts must always comply with the technical requirements and the specifications of the
manufacturer. This is always guaranteed when using spare parts from NFE.
Inspection intervals specified in this manual must be complied with. At the same time it is necessary
to meet the legal requirements.
The location and the operation of fire extinguishers must be made known on each building site.
Take note of the procedures for fire reporting and fighting fires.
2.3 Personnel Selection and Qualification
Only reliable personnel are allowed to work on or operate the machine. Note the statutory minimum
age. Specify clearly the responsibilities of personnel for operation, setting up, servicing and
maintenance work. Define responsibilities regarding traffic safety regulations and empower operator
to decline instructions from third parties which are not complying with the safety requirements.
Personnel being trained may only be deployed under constant supervision of an experienced
operator.
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 in accordance with the electrical engineering regulations.
2.4 Safety Precautions Applicable to Different Operating Conditions
Avoid any method of working that impairs safety! All precautions must be taken so that the machine
is only used in a safe and functional status.
Only operate the machine when all safety devices and related safety equipment, e.g.
detachable safety devices, emergency stops, and suction devices, are present and
operational!

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The machine has to be visually checked at least once a day for any damage or defects. In the event
of operational malfunctions the machine must be shut down immediately and secured. The fault
must be rectified before starting the machine again.
Secure the work area around the machine in public areas; provide a safety distance of
at least 10 feet around the machine.
All persons in the proximity of the machine must wear safety glasses with lateral
protection, as well as safety shoes. Ear protection may be required. The operator is
obliged to wear close fitting protective clothing.
Use only extension cables that are sized and marked in accordance with the overall power
consumption of the machine and the valid local guidelines.
Before starting the machine, make sure that no one will be endangered when the machines starts
running.
Do not switch off or remove the exhaust or ventilation devices when the machine is
running.
2.5 Repair Work, Maintenance Activities, and Default Repair on the Jobsite
Before starting any service work on the machine, put the machine in the safety off
position (section 2.6) to prevent the machine from being turned on accidentally.
Adjustments, servicing, inspection work, and inspection intervals specified in this manual, as well
as any information on the replacement of parts and systems of the machine must be 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 about it.
The dust bin of the connected dust collector must be emptied before transportation. Handle in
accordance with the local disposal regulations.
Do not use any aggressive cleaning materials on the machine; use lint-free cleaning cloths.
Always re-tighten any screws that are undone during servicing and maintenance work.
If safety devices need to be dismantled during setup, maintenance, or repair work, they must be
reinstalled and inspected immediately after completion of the service or repair work.
Make sure that materials and replacement parts are disposed of safely and in an environmentally-
friendly manner.
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.

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How to put machine in safety off position:
• Turn off the grinder.
• Turn off the dust collector.
• Wait for all drives to stop.
• Pull out main plugs.
• Secure machine against unintended start-up.
2.7 Dangerous Aspects of the Machine
Every machine, if not used according to the regulations, may be hazardous for operating,
setup 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 additional safety devices.
2.8 Electrical Engineering Regulations
The machine must only be started when all guards and dust collection parts are attached
and machine is standing flat on work surface.
If work on electrified parts is necessary, a second person must be deployed who can pull out the
plug in an emergency. The working area must be sealed with a red and white safety chain and a
danger sign. Use tools that are insulated against voltages.
Only start work once familiar with the electrical engineering regulations that apply to the area.
Only use voltage testers that comply with the regulations when troubleshooting. From time to time,
check voltage tester to ensure it is operationally efficient.
2.9 Special Instructions
Use proper tools for work. Damaged tools must be repaired or replaced immediately.
Use the required safety equipment and safety clothes (e.g. safety glasses, safety shoes, safety
gloves).
Instruct operators and repair personnel on the following:
• Cleaning and repair work are only allowed if the machine is shut off and in the safety off position.
• Opening or removing safety devices while the machine is running is not allowed.
• Replace all safety covers and devices after cleaning, repair, or maintenance work.
• Do not touch moving parts and do not 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.

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3.0 Parts
3.1 Parts List
3.1 Parts List
Qty Part # Description
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
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 402152 Dust Band, 108"
1 402352 Dust Skirt, 108"
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 402356 Tool Plate, Edging
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

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4.0 Maintenance
4.1 Recommendations
4.2 Maintenance and Inspection
4.3 Maintenance
4.4 Morflex Coupler Replacement
4.1 Recommendations
Prior to any repair work on the machine and its drives, put the machine in the safety off
position as described in section 2.
Failures due to inadequate or incorrect maintenance may generate very high repair costs and
long downtimes for the machine. Regular maintenance is essential; safety and service life of the
machine depend 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, the frequency of inspections for wear checks
may vary. 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.
• Check the dust collector hose for damage.
• Empty waste from the dust collector.
• 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.
Daily — After Operation • Check for debris in the dust ports under gear box and
near the handle.
• Check for dirt build-up on VSD and electric motor.

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4.3 Maintenance
If you replace parts yourself for specific reasons, the following instructions and work sequence
have to be observed:
• 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).
4.4 Morflex Coupler Replacement
To replace a worn or damaged Morflex Coupler perform the following:
1. Remove ½ in.-20 bolts from drive plate using a ½ in. impact wrench and ¾ in. socket.
2. Use pry tool to remove assembly from drive plate.
3. Remove ½ in.-20 bolts from tool plate using a ½ in. impact wrench and ¾ in. 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 on drive plate with bolts*. Tighten with impact wrench.
* When replacing bolts, be sure to hand tighten bolts BEFORE using impact wrench to tighten
further. This minimizes the risk of stripping the threads by tightening an unseated bolt.
5.0 Troubleshooting / Diagnostics
5.1 Diagnosis of Failures
5.2 Diagnosis of Electrical Failure
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.

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Failure Possible Reasons for Failure Corrective Actions
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 inch 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 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.
5.2 Diagnosis of Electrical Failure
Failure Possible Reasons for Failure Corrective Actions
Motor does not start up. Missing Phase. Check power supply.
Faulty switch or relays. Get diagnosis and replacement
by a skilled electrician.
Emergency Stop. Unlock the emergency stop
button.
Motor stops during
operation.
Current power is too high. Disconnect plug.
Supply circuit breaker is
disengaged.
Reset circuit breaker or replace
fuse.
Motor is damaged. Inspect motor.

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Item # Qty Description
3 8 Bearing w/Race
4 8 Oil Seal
5 4 Helical Gear Key (SM-072)
6 4 Woodruff Key 3/8 x 1 1/4
7 ** Shim .005
8 ** Shim .007
9 ** Shim .020
13 4 Locknut M24
14 6 Soc HD M10 x 50 Grade 12.9
15 24 HHSC M10 x 35
17 16 HX M10 x 30
18 4 Stud M18 x 2.5 x 3" LG
19 4 Lock Nut M18
20 1 Sq. HD Plug 3/4-14 NPT
21 1 Sq. HD Plug 1" NPT
23 1 Helical Gear
24 1 Housing
25 1 Cover
26 1 Input Pinion
27 4 Cover
28 2 Gear 89T
29 2 Gear 89T
30 4 Shaft
31 4 Coupling Flange
33 1 Motor 30HP 3 Ph
34 16 1/2"-20 3" Capscrew
35 16 1/2" Lockwasher
36 4 602 Morflex Coupler
37 4 Aluminum Tool Plate
38 12 EG Female Adapter QC
6.0 Parts List and Diagrams

11
Item # Qty. Descriptions
101 2 1" Cord Grip (6-4)
102 1 Plastic Water Tank
103 1 30HP/230V Variable Speed Drive
104 1 30HP/480V Variable Speed Drive
105 1 6/4 Power Cable - 5 ft. / 30 ft.
106 1 On/Off Switch with Plate - 30HP
107 1 Dead Man Key
108 1 1" 90° Cord Grip (6/4)
109 1 Water Valve
110 2 Swivel Caster
111 2 Main Caster (red wheel)
112 1 Axle
113 2 2 in. Vacuum Hose (3 ft.)
114 1 3 in. Vacuum Hose (3 ft.)
115 1 Rubber Dust Band
116 2 Handle Grips
117 4 Rubber Isolation Mounts
118 2 each Clevis Pin & Clip
119 6 Pocket Weights
120 1
Stainless Steel Adjustable Shroud
121 2 Spinner Nut
122 1 Lower Dust Skirt

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10
Item # Qty. Description
1 1 Muffler
2 A&B 1 / 1 Pre-foam Air Filter / Air Filter Element
3 1 Bonnet Filter
4 1 Propane Tank
5 1 Battery - 12V
6 1 Regulator
7 1 Battery Cable and Plug
8 1 Wiring Harness
9 1 Emissions Box includes O
2Sensor
10 1 Oil Filter
11 2 Spark Plug
12 2 Tensioner Bearing
13 2 Flange Bushing
14 1 Drive Belt
15 1 Front Pulley
16 1 Pulley Bushing
17 1 Clutch
17
1
8
9
11
16
15
14 13 12

13
5
6
1
2 3 4
Item # Qty. Description
1 1 Turn to Lock Throttle Cable
2 1 Ignition Switch w/Keys
3 1 Clutch Switch (6 pin)
4 1 Tach / Hour Meter
5 1 Water Valve Lever
6 1 Dead Man Switch

Warranty
14
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: ____________________________________________

NATIONAL
FLOORING
EQUIPMENT
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]