Smith LNX8 Series Use and care manual

3A6354A
EN
Operation, Repair, Parts
SMITH LNX8™
For removal of materials from flat horizontal concrete and asphalt surfaces.
For professional use only.
Pro Series - Rotary Cut
LNX8 Rotary Eraser (390 cc / 13hp Electric Start)
LNX8 Rotary Eraser (390 cc / 13hp Electric Start) (Series B)
LNX8 Rotary Eraser DCS (390 cc / 13hp Electric Start)
Important Safety Instructions
Read all warnings and instructions in this manual before using the
equipment. Be familiar with the controls and the proper usage of the
equipment. Save these instructions.
LNX8 LNX8 (Series B) LNX8 DCS

Contents
23A6354A
Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LNX8 (Series B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Handle Bar Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Engine Kill Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cutter Head Installation/Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Dust Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DCS Control (DCS Models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Machine Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Cutting Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Stop Cutting Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
DCS Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DCS Control Translations (DCS Models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Belt Replacement and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Drive Pulley Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Engine Pulley Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
DCS Models only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
DCS Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
DCS Actuator Rod Does Not Move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Outer Frame Assembly - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Outer Frame Assembly Parts List - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Shock Assembly - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Shock Assembly Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Adjustable Handles - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Adjustable Handles Parts List - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Adjustable Handles - LNX8 (Series B) & LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Adjustable Handles Parts List - LNX8 (Series B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Adjustable Handles Parts List - LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Drive System Assembly - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Drive System Parts List - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Drive System Assembly - LNX8 (Series B) & LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Drive System Parts List - LNX8 (Series B) & LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Front Assembly - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Front Assembly Parts List - LNX8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Front Assembly - LNX8 (Series B) & LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Front Assembly Parts List - LNX8 (Series B) & LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Controls Assembly - LNX8 (Series B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Controls Assembly Parts List - LNX8 (Series B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Controls Assembly - LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Controls Assembly Parts List - LNX8 DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Spindle Cutter Assembly (24 pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Spindle Cutter Assembly Parts List - 169068.PM3000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
DCS Control Box 18A790 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
LNX8 DCS only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
DCS System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
DCS Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
SMITH Standard Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Warnings
3A6354A 3
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation
point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When these
symbols appear in the body of this manual or on warning labels, refer back to these Warnings. Product-specific hazard
symbols and warnings not covered in this section may appear throughout the body of this manual where applicable.
WARNING
DUST AND DEBRIS HAZARD
Grinding concrete and other surfaces with this equipment can create dust that contains hazardous
substances. Grinding can also create flying debris.
To reduce the risk of serious injury:
• Control the dust to meet all applicable workplace regulations.
• Wear protective eye wear and a properly fit-tested and government approved respirator suitable for
the dust conditions.
• Use equipment only in a well-ventilated area.
• Grinding equipment must be used only by trained personnel who understand the applicable work-
place regulations.
ENTANGLEMENT AND MOVING PARTS HAZARD
Moving parts can pinch, cut or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Do not wear loose clothing, jewelry or long hair while operating equipment.
• Before checking, moving, or servicing equipment, disconnect battery.
BURN HAZARD
Cutters and engine can become very hot during operation. To avoid severe burns, do not touch hot
equipment. Wait until equipment has cooled completely.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not leave the work area while equipment is energized. Turn off all equipment when equipment is
not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manu-
facturer’s replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your distributor for information.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
• Maintain a safe operating distance from other people in the work area.
• Avoid any pipes, columns, openings, or any other objects protruding from work surface.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, inhalation of dust or
chemicals, burns, and hearing loss. This equipment includes but is not limited to:
• Protective eye wear.
• Protective shoes.
• Gloves.
• Hearing protection.
• Properly fit-tested and government approved respirator suitable for the dust conditions.

Warnings
43A6354A
Battery Disposal
Do not place batteries in the trash. Recycle batteries according to local regulations. In the USA and Canada call
1-800-822-8837 to find recycling location or go to www.call2recycle.org.
WARNING
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help pre-
vent fire and explosion:
• Use equipment only in well ventilated area.
• Do not fill fuel tank while engine is running or hot; shut off engine and let it cool. Fuel is flammable
and can ignite or explode if spilled on hot surface.
• Keep work area free of debris, including solvent, rags and gasoline.
• Keep a fire extinguisher in work area.
CARBON MONOXIDE HAZARD
Exhaust contains poisonous carbon monoxide, which is colorless and odorless. Breathing carbon
monoxide can cause death.
• Do not operate in an enclosed area.
BATTERY HAZARD
Lead-acid batteries produce explosive gases and contain sulfuric acid that can cause severe burns. To
avoid sparks and injury when handling or working with a lead-acid battery:
• Read and follow the battery manufacturer’s warnings.
• Exercise caution when working with metallic tools or conductors to prevent short circuits and sparks.
• Keep all sparks, flames, and cigarettes away from batteries.
• Always wear protective eyewear and protective equipment for face, hands, and body.
• If you have direct contact with battery fluid, flush with water and consult a physician immediately.
• Installation and maintenance must be performed by knowledgeable personnel only.

Component Identification
3A6354A 5
Component Identification
LNX8
AB
C
D
E
HJ
L
F
G
I
M
K
ti33805a
N
Component
A Handlebar
B Cutter Head Engage Lever
C Handlebar Adjustment Bolts
D Cutter Head Adjustment Dial
E Pressure Control Dial
FDust Skirt
G Vacuum Port
H Engine
I Electric Start Engine Switch
J Engine Throttle
K Engine Kill Button
L Pressure Indicator
M Wheel Stop
N Hour Meter / Tachometer
Component

Component Identification
63A6354A
Component Identification
LNX8 (Series B)
Component
A Handlebar
B Cutter Head Engage Lever
C Handlebar Adjustment Bolts
D Cutter Head Adjustment Dial
E Pressure Control Dial
FDust Skirt
G Vacuum Port
HEngine
I Electric Start Engine Switch
J Engine Throttle
K Engine Kill Button
L Pressure Indicator
M Wheel Stop
N Hour Meter/Tachometer
Component

Component Identification
3A6354A 7
Component Identification
LNX8 DCS
Component
A Handlebar
B Power Switch
C Handlebar Adjustment Bolts
D DCS Control
E Pressure Control Dial
F Dust Skirt
G Vacuum Port
H Engine
I Electric Start Engine Switch
J Engine Throttle
K Engine Kill Button
L Pressure Indicator
M Wheel Stop
N Hour Meter/Tachometer
S Home Button
T Zero Button
U Cut Depth Button
V Up/Down Buttons
W Manual Height Adjustment
Component

Setup
83A6354A
Setup
Handle Bar Adjustment
The handlebars are equipped with a high-density
vibration suppression material to reduce operator fatigue
when operating equipment. To adjust the handlebars to
a new position for different height operators please follow
these steps:
1. Using a 9/16” (14mm) wrench or socket, loosen the
bolts on both sides of the handlebars until the
handlebar moves freely.
2. Stand behind the machine and lightly tap the
handlebar to the desired position.
3. Re-tighten the bolts to 21.7 to 25 ft-lb (29-34 N•m) to
lock the handlebars into position.
NOTE: Never operate equipment with loose handlebars.
The bolts must be fastened tightly assuring the handle is
locked into position.
Engine Kill Button
In the event of a malfunction or an accident (such as the
machine operator falling or losing footing), the LNX8 is
equipped with a corded Engine Kill Button. Attach the
end of the cord to the operator’s belt or wrist, and snap
the clip into place on the button by raising the top of the
Engine Kill Button and inserting the clip into the gap. If
the operator becomes distanced too far from the
machine, the cord will detach from the button and the
machine will stop running. The engine can also be
stopped by pressing down on the Engine Kill Button.
Cutter Head
Installation/Replacement
Normal use will require periodic cutter head inspection
and may necessitate cutter replacement. Time of
replacement will vary according to usage and load
factors.
1. Non-DCS Models: Raise the Cutter Head Engage
Lever to the up position so the cutter head is off the
ground.
DCS Models: Press the Home Button on the DCS
Control so the cutter head is off the ground.
2. Remove Clevis Pin.
To avoid injury from unexpected start up, disconnect
spark plug wire and black battery cable before you
service your unit.

Setup
3A6354A 9
3. Non-DCS Models: Rotate Cutter Head Engage
Lever to upwards position to release lower linkage
from inner frame.
DCS Models: Press the Home Button on the DCS
Control.
4. Turn the pressure control dial until the indicator is at
“0”. This releases tension from the pressure control
spring.
5. Unhook spring from the spring plunger (bottom rear
section of machine).
6. Rotate the inner frame upwards to gain access to
the cutters.
7. If there is a cutter head attached, it must be
removed. To do so, strike the cutters in a counter
clockwise direction with a rubberized mallet or wood
block.

Setup
10 3A6354A
8. Install the new cutter assembly onto the machine by
spinning clockwise. Cutters will lock onto the
machine once surface removal is started.
9. Lower the inner frame back to a horizontal position.
10. Connect the spring to the spring plunger.
11. Lower the lower linkage into the slot in the inner
frame by rotating the Cutter Head Engage Lever
(non-DCS models), or by using the Down Button on
the DCS Control (DCS models).
12. Connect Clevis Pin.

Setup
3A6354A 11
Dust Control
Vacuum Attachment
1. If using a vacuum, attach vacuum hose to the
Vacuum Port.
2. Attach vacuum hose to the Inlet Port on the Cyclone
Separator (optional) or vacuum.

Setup
12 3A6354A
DCS Control (DCS Models only)
Buttons on the DCS Control have two functions, quick
press and long press. Quick press refers to pressing the
button and releasing the button quickly, while long press
is pressing the button and holding the button for two or
more seconds.
NOTE: “+” (plus) refers to above pavement surface. “-”
(minus) refers to below pavement surface.
Run Screen
Home Button
Quick Press: Takes the cutter head to its highest posi-
tion.
Long Press: Brings up Menu Screen.
Zero Button
Quick Press: Takes the cutter head to the surface.
Long Press: Reprograms the zero point to the current
cutter head position.

Setup
3A6354A 13
Cut Depth Button
Quick Press: Takes the cutter head to the Cut Depth Tar-
get.
Long Press:
- If at or above zero point: Opens new screen to
select desired cut depth using up/down buttons.
•To exit without saving, quick press the Cut Depth
Button.
•To exit with saving, long press the Cut Depth But-
ton.
- If below zero point: Reprograms the Cut Depth Tar-
get to the current cutter head position.
Up Arrow Button*
Quick Press: Raises the cutter head by 0.01” (0.25mm,
10 mil).
Long Press: Raises the cutter head to Home position.
Down Arrow Button*
Quick Press: Lowers the cutter head by 0.01” (25mm, 10
mil).
Long Press: Lowers the cutter head to Cut Depth Target.
*Handlebar Rocker Switch has the same functions as Up
and Down Arrow Buttons.

Setup
14 3A6354A
Menu Screens
To display the Menu Screens, hold down Home Button
from the Run Screen. To save menu settings and return
to Run Screen, hold down Home Button from any Menu
Screen.
To cycle through selections in each Menu Screen, use
Up and Down Arrow Buttons.
To advance to next Menu Screen, quick press the Home
Button.
Menu Screen #1 - Language
Select your desired language (English, Spanish, French,
German, or International Symbols).
Menu Screen #2 - Units
Select your desired depth units (inches, millimeters, or
mils).
Menu Screen #3 - Model Select
Your LNX8 model name can be found on the handlebar
dashboard label. Select the model on the DCS Control
which matches the model you have. This ensures accu-
rate depth readings. Hold down Up or Down Arrow But-
tons to cycle through models.
Menu Screen #4 - Software revision
Displays the revision of the software on the DCS Con-
trol.

Setup
3A6354A 15
Menu Screen #5 - Error Codes
Displays the most recent error code and the total num-
ber of times that error has occured. Cycle through previ-
ous error codes using Up/Down Buttons.
Error Codes
E04: High Voltage
E05: High Motor Current
E08: Low Voltage
E09: Hall Sensor Error
E12: High Current (short circuit)
E31: Home Button Error
E32: Zero Button Error
E33: Cut Depth Button Error
E34: Up Button Error
E35: Down Button Error
To clear an error code that appears while on the Run
Screen:
1. Turn DCS Power Switch OFF.
2. Address/Fix the issue.
3. Turn DCS Power Switch ON.
NOTE: See Repair Manual for more information on
Error Codes and Troubleshooting.

Operation
16 3A6354A
Operation
Machine Start Up
Before starting engine, perform the following:
• Read and understand engine manual.
• Make sure all guards are in place and secure.
• Make sure all mechanical fasteners are secure.
• Inspect for damage to engine and other exterior
surfaces.
• Inspect work area to locate any pipes, columns,
deck inserts, or other objects protruding from work
surface. Avoid these objects during operation.
Starting the Engine
• Connect Engine Kill Button Cord to operator and
machine.
• Open the fuel shut off on the gas tank and then
place the throttle lever at the “fast idle” position.
• Move the choke to closed.
• Push the Electric Start Engine Switch to start the
engine.
• After the engine starts, move choke to open.
• Set throttle to desired setting.
If the Engine Does Not Start
• Check engine for proper gas level.
• Check the spark plug. Make sure socket areas are
clean and clear of debris, and the proper gap is set.
Replace if needed.
• Battery might be dead. Try pulling the starter cord.
• Engine may have tilted backwards. If so, allow oil to
drain after removing spark plug.
• If engine still does not start, refer to the engine
manual.
• The engine will not start without the Corded Engine
Kill Clip securely in place.
Do not start machine while cutter head is in contact
with the ground. Doing so can cause the operator to
lose control of the machine, resulting in property
damage and/or personal injury.

Operation
3A6354A 17
Cutting Material
1. Start Engine, see page 16.
2. Turn vacuum on, if using a vacuum.
Adjusting Cutter Head Angle
1. Locate a level surface for cutter adjustment. All four
wheels should be on a level surface for setup.
2. Run at about 1/3 engine throttle.
3. Non-DCS Models: Lower the Cutter Head Engage
Lever.
4. Non-DCS Models: Slowly lower the Cutter Head
Adjustment Dial and at first sign of dust from the
cutters, raise the depth control knob up a couple of
turns and then lift the Cutter Head Engage Lever
back up.
DCS Models: Slowly lower the cutter head by pressing
the Down Button on the DCS Control repeatedly until the
first sign of dust from the cutters. Then raise the cutter
head off of the surface by pressing the Home Button.
5. Move the machine away from the current position to
inspect the cut. Use the elevation screws in the front
of the machine to pitch the cutter to the correct
plane to create the desired cut pattern. Loosen bolts
A and B, then adjust bolt C to modify the cutter head
angle. Tighten bolts A and B when the desired cutter
angle is achieved.
Maintain a safe operating distance from other people
in the work area. Avoid any pipes, columns, openings,
or any other objects protruding from your work sur-
face.
C
B
A

Operation
18 3A6354A
Concrete Cutting Setup
The machine set-up required when cutting
concrete is as follows:
1. Cutters should be parallel to the ground when
engaged.
2. Use the Pressure Control Dial to set the Pressure
Indicator to 0-1.
3. The cutting mark left by the machine should be an
even circle.
4. If the mark left by the machine is not as shown, adjust
the elevation screws accordingly. See page 17.
Asphalt Cutting Setup
The machine set-up required when cutting
asphalt is as follows:
1. Cutters should be at an angle no more than 2
degrees to the ground when engaged.
Max
Min

Operation
3A6354A 19
2. Use the Pressure Control Dial to set the Pressure
Indicator to 2-3.
3. The cutting mark left by the machine should be an
uneven circle.
4. If the mark is in the wrong direction, adjust the
elevation screws to pitch the cutter head to the
correct plane. See page 17.
Cutting Technique
These are recommended settings only. Increasing
spring tension, depth of cut and pitch will increase the
removal speed at the expense of reduced life and
surface finish.
NOTICE
NOTE: On harder surfaces, it may be best to make
several passes in increments of 1/32 in. (0.8 mm) to get
to the desired depth.
• Make certain that the cutter head is positioned to
where only the cutter tips strike the surface.
• The cutter head will not withstand substrate contact.
NOTE: Contacting the removal surface too deeply
will cause premature wear to the cutter head and
other components. The correct depth setting is
indicated by relatively little machine vibration.
• Cutting too deep only has negative results. Try to
remove materials in several passes rather than one,
deep pass. Several tests will show the best, most
appropriate cutter impact. Use a forward, backward
and/or circular pattern to achieve your desired
finish.
NOTE: Positioning the machine over the surface in
many directions, as well as dialing the hand wheel up or
down can help create desirable surface patterns. After
several hours of practice, the operator will become
comfortable and should be able to remove materials
faster with enhanced results.
NOTE: The engine should not labor. Run engine at full
speed and adjust the forward speed to fit the work being
performed. Harder concrete surfaces will have to be cut
at a slower pace than asphalt or other softer surfaces.
NOTICE
Care must always be taken to lift up the rotating
heads over any significant obstruction, including steel
or concrete expansion joints that can cause the cut-
ters or spindle components to break.
NOTICE
Should you desire to tilt the machine, always tilt
forward. Tilting the machine backwards at any time
will flood the spark plug with oil and may cause
damage to your engine.

Operation
20 3A6354A
Stop Cutting Material
1. Non-DCS Models: Raise Cutter Head Engage
Lever so that the cutter head is off the ground.
DCS Models: Press the Home Button on the DCS
Control.
2. Adjust Engine Throttle to low setting.
3. Depress Engine Kill Button.
4. Clean the entire exterior of the machine after it has
cooled. Check for worn or damaged parts and
perform any required Maintenance on page 23.