Onfloor OF9S-L User manual

OF9S-L Floor Machine - Printed in USA, April, 2020
Operation Manual & Parts List
OF9S-L Multi-Purpose Floor Machine
SAVE THESE INSTRUCTIONS
Address: 777 South Street, Newburgh, New York 12550-0606
TEL: [phone]
Internet Address: www.onfloor.com / [email protected]m

2
Table of Contents
General Instrucons ..............................................................................................................................................3
Silica Vacuum Warning ..........................................................................................................................................4
Important Safety Instrucons................................................................................................................................5
Grounding Instrucons & Methods........................................................................................................................6
Operang Instrucons...........................................................................................................................................7
Installaon & Changing of Accessory Tools............................................................................................................8
Changing and Installaon of Aachments...............................................................................................................8
General Safety Precauons.................................................................................................................................. 13
Machine Maintenance............................................................................................................................................13
OF9-SL Frame Drawing & Parts List......................................................................................................................14
OF9-SL Dust Cover Drawing & Parts List...............................................................................................................15
OF9-SL Adjustment Knob Drawing & Parts List .................................................................................................... 16
OF9-SL Handle Drawing & Parts List.....................................................................................................................17
OF9-SL Switch Box Drawing & Parts List...............................................................................................................18
OF9-SL Motor Wiring Drawing & Parts List...........................................................................................................19
Troubleshoong Guide ........................................................................................................................................ 21
Warranty Informaon..........................................................................................................................................22

3
General Instructions
READ & FOLLOW ALL INSTRUCTIONS BEFORE USING THIS FLOOR
MACHINE
This floor machine will afford you many years of trouble-free operating satisfaction if it is given proper
care. All parts have passed rigid quality control standards before being assembled to produce the
nished product. Prior to packaging, units are again inspected for assurance of flawless operation.
This floor machine was protectively packed to prevent damage in shipment. We recommend that upon
delivery, remove the unit from its carton and carefully inspect it for any possible damage in transit. A
warranty card is affixed to the handle. It is your responsibility to fill it out and send it to our office to
register your purchase and start your warranty. Failure to send us this card in within one week upon receipt
of the machine may void the warranty.
If damage is discovered, immediately notify the transportaon company that delivered your floor
machine. As a shipper, we are unable to act upon any claim for concealed damage. You must originate
any claim within 5 days of delivery.
These instrucons are for your protecon and information. PLEASE READ CAREFUL L Y! Failure to
follow these precauons could result in injury or discomfort.
Treat this oor machine as you would any other high-grade precision-made product. Throwing,
dropping, unreasonable bumping across thresholds and other misuse may result in a damaged unit and
invalidate the warranty.
[This section intentionally left blank]

4
Silica Vacuum Warning
Grinding/sanding of masonry, concrete, metal and other materials with silica in
their composion may give o dust or mists containing crystalline silica.
Silica is a basic component of sand, quartz, brick clay, granite and numerous other minerals and rocks.
Repeated and/or substanal inhalaon of airborne crystalline silica can cause serious or fatal respiratory
diseases, including silicosis. In addion, California and some other authories have listed respirable
crystalline silica as a substance known to cause cancer. When grinding such materials, always follow
respiratory precauons. Use appropriate NIOSH-approved respiratory protecon and OSHA approved
vacuum where dust hazard may occur.
CALIFORNIA PROPOSITION 65 MESSAGE Some dust created by power sanding, sawing, grinding, drilling,
and other construcon acvies contain chemicals known (to the State of California) to cause cancer,
birth defects or other reproducve harm. Some examples of these chemicals are: • Lead, from lead-
based paints • Crystalline silica from bricks, cement and other masonry products • Arsenic and
chromium, from chemically treated lumber. For further informaon, consult the following sources:
hp://www.osha.gov/dsg/topics/silicacrystalline/index.html
hp://www.cdc.gov/niosh/docs/96-112/
hp://oehha.ca.gov/prop65/law/P65law72003.html
hp://www.dir.ca.gov/Title8/sub4.html
Your risk from these exposures varies depending on how oen you do this type of work. To reduce your
exposure to these chemicals, work in a well-venlated area, and work with approved safety equipment,
such as dust masks that are specially designed to lter out microscopic parcles. The use of a dust
extracon device should always be used when grinding/sanding dry with Onoor equipment. To achieve
a high level of dust collecon, use an industrial HEPA vacuum cleaner.

5
Important Safety Instructions
To reduce the risk of re, electric shock or injury:
Read all instrucons before using this oor machine.
1) DO NOT leave the oor machine plugged in when not in use. Unplug from the outlet when not
in use and/or before servicing.
2) Electric shock could occur if exposed to rain. Store indoors.
3) This is NOT a toy. Close aenon is necessary when used around or near children.
4) Use only as described in this manual. Use only manufacturer's recommended attachments.
5) DO NOT use with damaged cord plug. If the oor machine is not working as it should because it
has been dropped, damaged, le outdoors, or dropped into water, contact the manufacturer or
authorized service center.
6) DO NOT handle the plug or operate with wet hands.
7) DO NOT pull or carry by cord, use power cord as a handle, close a door on cord, or pull cord
around sharp edges or corners. DO NOT run floor machine over the cord. Keep cord away from
heated surfaces.
8) DO NOT unplug by pulling on cord. To un- plug, grasp plug, not the power cord.
9) DO NOT put any object into motor openings.
10) Keep hair, loose clothing, ngers and all parts of body away from moving parts.
11) DO NOT use a vacuum without the proper manufacturer’s filters in place.
12) DO NOT operate where anesthecs and oxygen are used.
13) DO NOT use around ammable or combustible liquids such as gasoline or use in areas
where they may be present.
14) Replace damaged or worn parts immediately with genuine Onfloor equipment parts to maintain
safety and protect your limited warranty.
15) Floor sanding can result in an explosive mixture of fine dust and air. Use a oor sanding
machine only in a well-ventilated area.
16) This oor machine must be connected to a properly grounded outlet only. (See grounding
method on page 6)

6
Grounding Instructions & Methods
Improper use of the grounding plug can result in a risk of electric shock!
This floor machine must be grounded. Grounding provides a path of least resistance for electrical current
to reduce the risk of electric shock.
This machine is equipped with an equipment-grounded plug. The plug must be inserted into an
appropriate outlet that is properly installed and grounded in accordance with all local codes and
ordinances.
If repair or replacement of the cord or plug is necessary, DO NOT connect the grounding wire to either flat
blade terminal. The insulated wire with an outer surface that is green with or with- out yellow stripes is the
grounding wire.
The oor machine is for use on a nominal 120 volt circuit and has a grounding plug that
looks like the plug illustrated in (Fig A). A temporary adaptor that looks like the adaptor
illustrated in (Fig B & C) may be used to connect the plug to a 2-pole receptacle as shown
in (Fig A) if a properly grounded outlet is not available.
The temporary adaptor should be used only unl a properly grounded outlet (Fig A) can
be installed by a qualified electrician. The green color rigid ear, lug, or like extending from
the adaptor must be connected to a permanent ground such as a properly grounded
outlet box cover. Whenever the adaptor is used, it must be held in place by the metal
screw (Fig C).
WARNING: Improper connecon of the equipment-grounding conductor
can result in a risk of electrical shock. Check with a qualied electrician or
service person if you are in doubt as to whether the outlet is properly
grounded. DO NOT modify the plug provided with the machine. If it will not
t the outlet, have a proper outlet installed by a qualied electrician.
NOTE: In Canada, use of a temporary adaptor is not permied by the
Canadian Electrical Code.

7
Operating Instructions
1) Clear the oor of any materials or objects.
2) Select and install the accessory tools required for the job. (See p 8 for installaon instrucons.)
3) Move the handle from the lowered “storage” posion to the angled “operang” posion and lock in
place.
4) Place your hands on the handle grips and apply slight pressure to lighten the load on the tools. DO
NOT li the tools o of the ground!
5) Push the start switch toggle forward to “ON” posion. Motor will start.
6) When the machine is running, remove handle pressure and lower completely onto the working
surface.
7) To stop the machine push, start switch toggle backward to “OFF” posion.
Note: If machine unexpectedly shuts down due to a circuit overload, check breaker box feeding the
outlet that the machine is plugged into. TURN MACHINE TOGGLE TO “OFF” POSITION BEFORE
RESETTING CIRCUIT BREAKER.
DO NOT aempt to operate this unit if the machine is not fully assembled. When
servicing or replacing accessories turn OFF the machine and disconnect from the
power source.
Reversing Tool Direcon
The tools can be rotated in either direcon on this machine. The “Forward” direcon is when the cooling
fan on top of the motor is rotang counter-clockwise when viewed from the operator’s posion. The
“Reverse” direcon is when the cooling fan rotates clock-wise when viewed from the operator’s
posion. There is a toggle switch located on the side of the motor connecon box that allows the
operator to select the desired direcon. If a change in direcon is desired, change the switch posion
while motor is o.
All tools supplied by Onoor can operate in the Forward direcon. Some tools supplied by Onoor can
be operated in either direcon. Tools such as 8-way scrapers and Diamabrush tools are designed to
operate in Forward direcon ONLY.
If you have quesons about tool direcon, please contact Onoor or your Onoor representave before
using.

8
Installation & Changing of Accessory Tools
When installing or changing tools, turn OFF the
Machine and disconnect the power cord from the electrical outlet
Before Installaon or Changing Aachments:
1. Unplug the machine from the wall outlet.
2. Ensure handle is in the straight up posion and locked in place.
3. Tilt machine back by bracing it with your foot unl the handle is lying on the oor and the head is
fully exposed. Note: It is recommended that a towel or pad is placed under the machine to protect the
oor.
Changing and Installaon of Aachments
Always wear protecve gloves when installing or removing aachments.
1. Using one hand as leverage and the other to pry the tool away from the machine using a at
screwdriver or pry bar.
2. Select the aachment required for the job, line up the holes on the aachment with the four metal
pins protruding from each of the three heads.
3. Push aachments on by hand and if necessary, carefully tap it into place with a rubber mallet.
4. Carefully raise the handle, supporng the axle with your foot to control the head of the machine as it
is placed on the oor.
5. Check the liquid level on the frame between the wheels. Turn the knop beside the level unl the
bubble is between the lines. (See Leveling Machine for more detail.)
6. Since the aachments are dierent heights, you may need to adjust the dust skirt to make sure it is
level with the aachments. This will ensure clean and virtually dust-free operaon.
7. To adjust skirt, align the skirt with the center of the machine and wrap it around allowing boom
edge of skirt to contact oor.
8. Move the handle back to the operang posion and lock in place.
Leveling Machine for Tool Wear or Tool Change.
Any me the tool is changed on the machine, the machine must be leveled in order to maintain proper
tool contact to the oor. This adjustment needs to be checked periodically even when the same tool is
used for an extended me. To do this nd the liquid level located at the rear of the machine. The goal is
to keep the bubble centered between the lines while the machine is in the user posion. Beside this
level is an adjusng knob. While observing the level, rotate the adjustment knob to center the bubble
between the lines.
If the bubble appears toward the rear of the machine, rotate the knob clockwise to move the bubble to
center.
If the bubble appears toward the motor, rotate the knob counter-clockwise to move the bubble to
center. It will be easier to make this adjustment by liing up on handle while turning the knob.

9
Belt Changing Instructions
1. Unplug machine from power source.
2. Remove the vacuum hose from the top of machine by twisting and sliding the hose cuff from the
tube just behind the front handle.
3. Place handle in the straight up position and latch there.
4. Remove any weights on machine.
5. Tilt handle back until handle rests on floor. Place a cloth beneath handle to protect floor.
6. Remove tool (if present) by prying the tool using a flat screwdriver or small pry bar. Use gloves for
this step.
7. Using a ½” wrench or socket remove the four (4) 5/16-18 hex bolts on the underside of the machine.
This will allow the dust cover to be removed from machine.
8. Raise machine back up to normal position.
9. Using a 9/16 wrench or socket, loosen, but DO NOT REMOVE the four (4) 3/8-16 bolts located on the
motor mounting plate. They should be loosened enough that the lock washer under the head can be
rotated by hand.
10. At the very rear of the machine locate the 3/8-16 tensioning bolt. This bolt connects to the motor
mounting plate beneath the liquid level. Using two 9/16 wrenches, hold the head of the bolt while using
the other to loosen the 3/8 nut on the shaft of the bolt.
11. Once the nut is loosened, turn the bolt head counter-clockwise to relieve tension on the motor
mount plate and therefore the belt. Continue loosening both the nut and bolt head in turn while sliding
the motor toward the front of machine.
12. Place your hand under frame of machine and work belt off of rear motor pulley.
13. To install new belt, tilt machine back and rest on floor as in step 4. Wrap belt around large pulley
first, then around motor pulley. Note, it may be necessary to slide the motor up in order to get the belt
around the motor pulley.
14. Using a 9/16 wrench or socket, tighten the 3/8 tensioning bolt (same bolt as in step 9) until belt is
snug. Set machine back upright.
15. Tighten the locking nut on the tension bolt using a 9/16 wrench while holding the head of the
tensioning bolt.
16. Using a 9/16 wrench or socket tighten the four (4) 3/8 bolts that secure the motor mounting plate
(same bolts as in step 8). Turn the large pulley by hand to make sure belt is properly tracking in the
pulleys. Tilt machine back until handle rests on floor.

10
17. Replace the dust cover using the four (4) 5/16 bolts, lock washers and flat washers. Tighten using a ½
wrench or socket.
18. Set machine upright and reinstall the vacuum hose onto the vacuum tube.
Bearing Inspection
To inspect the condition of the bearings in the large pulley it is necessary to first loosen the tension on
the belt. To do this, follow the steps 1-12 in the “Belt Change” section. Then tilt machine back until
resting on floor. After loosening the belt tension, move the pulley left to right to detect any movement
or play in the bearings. There should be almost no movement during this inspection. The more play, the
worse the condition of the bearings.
Bearing Replacement
This job requires a set of retaining ring plyers, safety glasses and the proper replacement bearings as
well as some general hand tools. The bearings used here are 6204 bearings with double seals. These are
available from Onfloor, part number 297623. It is very important to wear the safety glasses especially
when removing and installing the retaining rings. If you do not have retaining ring plyers they can be
purchased at Lowes, Home Depot, Harbor Freight, and other tool stores for about $30.
Once the bearings are determined to be in need of replacement, follow the steps below to remove the
pulley.
First, follow the steps in the section “Belt Changing Instructions” to remove the belt. Then follow the
steps below.
1. With the handle in the straight up position, tilt the machine to its right side so the machine is
resting on the side of the frame and one of the wheels. This makes the machine stable and less
likely to tip over.
2. Using a 15/16 socket with an extension, remove the nut and flat washer located in the center of
the pulley. The flat washer located behind the nut is a 16mm flat washer and not a standard SAE
type so be careful not to lose them as they may be challenging to purchase locally. Pull the
pulley straight out and away from the machine.
With the pulley removed we can proceed with bearing replacement. Look at the pulley from the back
and you will see the retaining ring that secures the bearings in place. Wearing your safety glasses and
using the retaining ring plyers remove the retaining ring.
Installation Using a Press
The best method to remove and install new bearings is to take the pulley to a hydraulic press and press
the bearings in and out. When using this method, it is important to properly support the pulley to allow
space for the old bearings to exit. This is accomplished by supporting the pulley as close to the center as
practical using 2 pieces of 2 x 4 lumber or 2 pieces of equal thickness steel. When pressing the old
bearings out it is acceptable to use almost any device as a pushing tool as long as it will fit through the
center opening without touching the pulley. This means a piece of metal tubing or rod or even a piece of

11
wood that will fit through a 1.29” diameter hole. The same 15/16 socket used to remove the nuts works
well for this. We do not need to be cautious about damaging the old bearings during removal. See
illustration page 12.
When installing the new bearings, first clean the surface of the opening where the bearings are to enter.
If your pulley has the 4 drive pins installed, I suggest removing them for this process. You will need a
7/16 deep well socket for this. Stand the pulley in the press resting on its front face. Use a pusher device
that will contact the OUTER RACE. It is important that you do NOT press on the inner race or seal to
install the bearings. This will damage the bearings and shorten their life. The best choice for a pushing
tool is a round rod/pipe or piece of wood that is 1-13/16” diameter that will pass through the opening in
the pulley. Many people use a large socket that makes contact with the outer race but fits through the
opening. The first bearing must be pressed all the way down to the bottom of the cavity, followed by the
spacer ring (you don’t want to forget this) then, finally the last bearing. Be careful not to over press
especially if you left the drive pins in the pulley. When properly installed the last bearing will be below
the retaining ring groove and the retaining ring should go in easily. See illustration page 12.
Installation without a Press
When using this method, use a short piece of wood (or 15/16 socket) and a mallet/hammer to drive the
old bearings from the pulley. Support the pulley on a piece of wood to prevent damaging it. We don’t
have to be cautious about damaging the old bearings during removal. As bearings are driven out, lift
pulley to allow exit. When installing the new bearings, first clean the surface of the opening where the
bearings are to enter. Turn the pulley over and rest its front face (or drive pins if present) on the piece of
wood. Place the first bearing in the center opening and place a flat piece of wood or steel across the top
of the bearing. See Illustration, page 12. It is important that you drive the bearing in straight AND that
you do this by applying force to the outer race. It is OK that the flat steel or wood is contacting the inner
race as long as the outer race is also in contact. Tap the wood/steel plate with the hammer and slowly
drive the bearing until it is flush with the top of the pulley. Now there are 2 ways to proceed. One is to
find a round object (large socket, steel tube, steel rod, etc.) that will contact the outer race and also fit
through the opening in the pulley and use this object to further tap the bearing to the bottom of the
cavity. The other way is to use a short wooden dowel ½ or ¾” in diameter and to tap the outer race with
small taps as you work the dowel around the perimeter of the outer race as you gradually drive the
bearing down to the bottom. When the first bearing is installed, follow with the spacer ring (you don’t
want to forget this) then; repeat the same process with the top bearing. Then install the retaining ring.
Reinstall drive pins, pulley, in reverse order.
Reinstall belt and dust cover as covered in the “Belt Change” section.

12

13
General Safety Precautions
This machine is designed for surfacing concrete and sanding wood oors. All operators
and maintenance personnel should read and understand the safety procedures with
this oor machine.
1) All personnel in the immediate work area must wear safety glasses with side shields whenever the
machine is in operation. Protective clothing is also recommended. Long sleeve shirts and safety shoes
should be worn. Avoid wearing loose clothing.
2) DO NOT aempt to service or replace aachments while the machine is running or connected to a
power source.
3) DO NOT operate this oor machine in the rain or in areas where liquids could enter the electrical
components of the machine.
4) Keep the power cord away from the revolving heads to avoid damage.
5) Check main power supply to assure that you are connecting the equipment to a proper dedicated
service.
Machine Maintenance
1) Unplug the machine.
2) Aer each use, wipe o machine with a clean cloth.
3) Empty the vacuum you are using in accordance with specific manufacturer’s safety & operation
instructions.
4) Check for loose parts and fasteners.
5) Check the power cord for any breaks in the wire. Breaks will most likely occur near the plug
or switch. Repair or replace any breaks immediately.

14
OF9-SL Frame Drawing & Parts List
ITEM
DESCRIPTION
QTY
PART
NO.
ITEM
DESCRIPTION
QTY
PART
NO.
1
MOTOR, 1.5 HP, 1740 RPM, 115 VOLT
1
288292
12
BOLT, HEX 3/8-16 X 1
8
612286
2
FRAME WELDMENT
1
607797
13
WASHER, FLAT, 3/8
5
603880
3
MOTOR MOUNT PLATE
1
608254
14
WASHER, SPLIT LOCK 3/8
8
368849
4
SHAFT, PULLEY
1
611077
15
NUT, 3/8-16
1
612359
5
WHEEL MOUNTING BRACKET
1
607967
16
BOLT, HEX 3/8-16 X 3 FULL THRD
1
612294
6
PULLEY, DRIVING
1
608378
17
BOLT, HEX, 1/2-13 X 8
1
612316
7
WHEEL
2
490093
18
NUT, 1/2 - 13 NYLOCK
1
297429
8
HUBCAP
2
490881
19
SCREW, FLAT HD #8-32 X 1
2
612251
9
LEVEL
1
288918
20
NUT, #8-32 NYLOK
2
385158
10
SCREW, FLAT HD, 5/16-18 X 1
4
612278
21
WASHER, FLAT, 16 MM
1
490636
11
NUT, 5/16-18 NYLOK
4
380792
22
NUT, 5/8-11 NYLOK
1
490628

15
OF9-SL Dust Cover Drawing & Parts List
ITEM
DESCRIPTION
QTY
PART
NO.
ITEM
DESCRIPTION
QTY
PART
NO.
1
DUST COVER ASSY
1
607886
9
HOOK & LOOP, MALE
1
608351
2
BRUSH SEAL
1
297747
10
SKIRT, DUST, SINGLR DISC
1
608203
3
SEAL RETAINER PLATE
1
611069
11
BOLT, HEX, 5/16-18 X .75
4
612324
4
PULLEY, FINAL DRIVE
1
608394
12
WASHER, SPLIT LOCK, 5-16
7
316113
5
BEARING, 6204
2
297623
13
RING, RETAINING
1
611514
6
SPACER, 6204
1
612049
14
WASHER, FLAT, 5/16
4
327433
7
BELT, TIMING 840-8MGT-20
1
608408
15
BOLT, HEX 5-16-18 X .50
3
612332
8
PIN, ACCESSORY
4
490458

16
OF9-SL Adjustment Knob Drawing & Parts List
ITEM
DESCRIPTION
QTY
PART
NO.
1
KNOB
1
608335
2
WASHER, BRONZE
2
608327
3
ANGLE BRACKET
1
608300
4
ROD, THREADED 3/8-16
1
608319
5
ROD END WELDMENT
1
608122
6
WASHER, FLAT 3/8
2
603880
7
NUT, 3/8-16 NYLOK JAM
1
608443
8
BOLT, HEX 3/8-16 X 1
1
368830
9
NUT, 3/8-16 NYLOCK
2
480789

17
OF9-SL Handle Drawing & Parts List
ITEM
DESCRIPTION
QTY
PART
NO.
ITEM
DESCRIPTION
QTY
PART
NO.
1
UPPER HANDLE WELDMENT
1
608025
9
BOLT, HEX 3/8-16 X 2.5 FULL THREAD
2
612308
2
LOWER HANDLE WELDMENT
1
608092
10
NUT, 38-16 NYLOK
2
612359
3
BRACKET, STRIKER LH
1
611026
11
BOLT, HEX, 5/16-18 X .75
8
612324
4
BRACKET, STRIKER RH (NOT SHOWN)
1
611018
12
NUT, 5/16-18 NYLOK
2
380792
5
PLATE, LATCH
1
608270
13
BOLT, HEX, 5/16-18 X .50
2
299618
6
BAR, LATCH
2
610992
14
BOLT, HEX, 1/4-20 X .75
4
612340
7
SPRING
2
611034
15
NUT, 1/4-20 NYLOCK
6
380784
8
GRIP
2
490180

18
OF9-SL Switch Box Drawing & Parts List
ITEM
DESCRIPTION
QTY
PART
NO.
1
SWITCH, BOX ASSY
1
286575
2
WIRE CLAMP 3/4
1
497754
3
POWER CORD 30'
1
491160
4
MOTOR CORD W/FEMALE PLUG
1
490229
5
TERMINAL, RING
2
612367

19
OF9-SL Motor Wiring Drawing & Parts List
ITEM
DESCRIPTION
QTY
PART
NO.
1
SWITCH, DPDT
1
612065
2
WIRE CLAMP 3/4
1
497754
3
PIGTAIL, MALE
1
495786
4
WIRE NUT
2
350648
5
TERMINAL, QD 18 GA
1
612081
6
TERMINAQL, QD 14 GA
1
612073
7
WIRE ASSY, VIOLET JUMPER
1
612146
8
WIRE ASSY, BROWN JUMPER
1
612154
9
WIRE ASSY, VIOLET
1
612162
10
WIRE ASSY, BROWN
1
612170

20
OF9-SL Vacuum Hose Drawing & Parts List
ITEM
DESCRIPTION
QTY
PART
NO.
1
CUFF, VAC HOSE, 1.5"
2
465976
2
HOSE 2', VACUUM, WITH 1.5"CUFFS
1
612375
3
WASHER, FLAT 3.8
4
603880
4
NUT, 3/8 - 16 NYLOCK
1
480789
5
VAC TUBE WELDMENT
1
608157