DOSKO 337-13H-CE User manual

1
Owner’s Manual
Instructions for Operation, Maintenance
Stump and Root Grinder
337-13H-CE (2961000CE) 357-13HE-CE (2961010CE)
620-20HE-CE (2961020CE) 620-25KE-CE (2961060CE)
Your Dosko grinder is intended for outdoor-use only and can be used to remove many tree stumps and
exposed root systems close to ground level. By moving the blade in sweeping movements laterally over
the top and front of the stump, you can gradually grind it away. Make sure you completely read and
understand this manual before using the grinder for the first time.
WARNING
READ and UNDERSTAND this manual completely before using the grinder! Failure to properly operate,
and maintain this grinder could result in serious injury or death to the operator or bystanders.
All machines have hazards associated with their operation. This stump grinder has certain special hazards,
which you must be aware of. As an operator or owner you have a duty to be aware of these hazards and know
preventive measures to take to avoid them. When reading this manual pay particular attention to avoiding these
hazards.
In particular, be aware of the following:
Know location of buried electrical and other utility lines.
Do not allow children or untrained adults to operate.
Wear eye protection and other personal protection against flying rocks and debris.
Check that cutter wheel teeth are secured, sharp and not missing.
Do not operate if operator presence bar fails to stop engine upon release.
Make sure no children or bystanders are within 23 meters of stump grinding operation.
Protect cars, windows and other objects within 23 meters from flying debris.
Be prepared for machine “kickback” when initially contacting the stump.
Be aware of potential for carbon monoxide (CO) poisoning.
Prevent fires/explosions from fueling.
Do not attempt to perform adjustments, declog or clean unit while engine is running.
Avoid burns from engine or hot exhaust.
Avoid using in wet or icy conditions where falls may occur.
Details about these hazards are found throughout the manual and are summarized at the end of the manual under
“Important Safety Information.”
STOP!
ADD ENGINE OIL, FUEL & BATTERY:Your stump grinder comes fully assembled and requires only that you add
engine oil to crankcase, fuel to tank, and a battery.
INSPECT COMPONENTS:Closely inspect to make sure no components are missing or damaged. See the “Receiving
Your Unit” section for instructions on whom to contact to report missing or damaged parts.
Any Questions, Comments, Problems, or Parts Orders
Call your dealer or Dosko Customer Service 1-763-428-2237
MODEL NUMBER: 2961000CE, 2961010CE,
2961020CE, 2961060CE
SERIAL NUMBER: _____________
M2961000CEB.3
HSS2030 (V12A)

Hazard Signal Word Definitions
2

Table of Contents
3
Part I. Introduction
About Your Grinder ..............................................................................................................4
Safety Decal Locations............................................................................................................5
Safety Decals............................................................................................................................6
Transporting & Receiving:
1. Receiving Your Unit......................................................................................................7
2. Towing Instructions.......................................................................................................7
Machine Component Identification ......................................................................................8
Part II. Operation
Operation:
1. Pre-Start Check List & Procedures...............................................................................9
2. Starting the Grinder.......................................................................................................12
3. Stopping Engine............................................................................................................14
4. Grinding Stump.............................................................................................................14
5. Refueling.......................................................................................................................15
6. Storing Machine............................................................................................................16
Part III. Maintenance and Repair
Maintenance (To be done by owner or Rental Dealer) ..........................................................18
1. Belt Tension Adjustment ............................................................................................ 20
2. Stop-Switch Adjustment............................................................................................. 21
3. Setting & Sharpening Teeth........................................................................................ 21
4. Schedule...................................................................................................................... 23
Specifications..........................................................................................................................24
Part IV: Important Safety Information
Summary of Important Safety Information for Operation .............................................. 25
Special Safety Information on Static Electricity................................................................ 28
Parts Explosion........................................................................................................................ 29
Wiring Diagrams..................................................................................................................... 31
Warranty.................................................................................................................................... 33

About Your Grinder
4
Thank you for purchasing or renting your Dosko grinder!
Owner/Operator/Renter Training
Read and follow all instructions and safety precautions presented throughout this manual. A summary of
important safety information can be found at the end of the manual. Keep this manual for reference and
review. If the owner of this unit is different than the operator, give a copy of this manual to any
operator to read.
Rental Companies
All persons to whom you rent/loan this grinder must have access to this manual and read it. Check the
tube on the side of the unit to make sure a manual is inside. Advise all persons who will operate the
machine to read it. You should also provide personal instruction on how to safely operate the grinder and
remain available to answer any questions a renter/borrower might have. If videos are available, have
renter watch training video.
Engine Instructions
For detailed Engine operation and maintenance information, always refer to the engine Owner’s Manual
furnished with the grinder.
Product Suitability
Before using, the user shall determine the suitability of this product for this intended use and assumes
liability therein.
Your Dosko grinder can be used to remove many tree stumps and exposed root systems close to ground
level. By moving the blade in sweeping movements laterally over the top and front of the stump, you can
gradually grind it away. Never use a stump grinder for anything but grinding wooden tree stumps. The
intended operating environment is -20°C to 40°C to 95% RH. This is representative of most outdoor
conditions. Make sure you completely read and understand this manual before using the grinder for the
first time. If you have any questions, contact your retail or rental dealer or Dosko Customer Service at 1-
763-428-2237.
WARNING: Never attempt to cut on a slope exceeding 15.
Exercise caution when cutting stumps on an incline, as the machine may shift or slide unpredictably. Never
attempt to cut with the machine uphill or downhill from you as it may slide toward you or you may fall
toward the machine. Cut only on a slope from the side.
˙
Dosko is constantly improving its products. The specifications outlined herein are subject to change
without prior notice or obligation. The purchaser and/or user shall assume liability for any modification
and/or alterations of this equipment from original design and manufacture. Any alterations shall void
warranty and CE Certification.
Contact Dosko Customer Service at 1-763-428-2237 for any questions about the appropriate use of
this grinder or about optional accessories.
Warranty Registration
Please fill out and submit the warranty registration card so that we have your contact information for any
future product literature or replacement parts you may need.

Safety Decal Locations
5
Reference #
Part #
Description
Model #
1
789537
Cut Foot Hazard
All
2
789538
Flying Debris Hazard
All
3
789661
Control Panel
337-13H-CE
357-13HE-CE
620-25KE-CE
789663
620-20HE-CE
WARNING
ALWAYS make sure safety labels are in place and in good condition. If a safety label is
missing or not legible, order new labels.

Safety Decal Locations
6
To order replacement safety labels, call Dosko Customer Service at 1-763-428-2237.
Ref.
Description
A
Cutting hazard to foot.
Keep distance.
B
Thrown object hazard.
Keep distance.
C
Wear eye protection while
operating.
D
Wear ear protection while
operating.
E
Wear protective footwear
while operating.
F
Wear gloves while
operating.
G
Push to stop. Pull to run.
H
Hazards exist. Read
manual before operating.
I
Move control forward to
disengage brake. Move
control backward to
engage brake.
J
Pull to increase choke.
Push to decrease choke.
K
Pull to increase throttle.
Push to decrease throttle.
1
789537
A
2
789538
B
789663
H
I
C
F
D
G
J
K
E
3
789661
C
D
E
F
G
I

Machine Component Identification
8
Reference
#
Description
Reference
#
Description
1
Control Panel
10
Gas Tank
2
Pin Adjustment Handle Bar
11
Engine
3
Tire and Hub
12
Adjustable Brake Lever
4
Discharge Flap
13
Handle Bar
5
Belt Guard
14
Operator Presence Handle Bar
6
Tooth Pocket
15
Fuel Shut Off Valve (620 only)
7
Cutting Tooth
16
Nameplate
8
Cutter Wheel Disc
17
Serial Number
9
Cutter Guard

Operation
9
1. Pre-start Check List & Procedures
CAUTION:
Add engine crankcase oil. A new engine is shipped without oil. You must add the correct
amount of oil to engine crankcase or engine will be damaged beyond repair.
Before starting the engine you will want to make sure you have completed the following:
1. Marking Underground Utilities
2. Checking Controls
3. Checking/Adding Oil
4. Filling Stump Grinder Gasoline Tank
5. Inspecting Fuel System for Leaks
6. Adjusting Handle Bar
7. Wearing Personal Protection
8. Trimming Stump with Saw
9. Clearing Area of People and Objects
10. Working During Daylight
11. Battery Installation
Each of these procedures is discussed in detail below.
Marking
Underground
Utilities
Call your local utility company to request marking utilities 3 days
before stump grinding. Trees can grow on top of and around
underground wiring that was installed many years before a tree was
planted.
Check Controls.
Check that:
All guards are in place and tight
Operator presence bar switch is free moving.
Inspect tires and rims for looseness, damage, and tire inflation.
Check Cutting
Teeth
Inspect cutting teeth for tightness and sharpness. Only use factory-approved
parts for repair.
Check/Add Oil
Check the oil level using the dipstick and add oil as needed daily.
Using a funnel, add oil up to the FULL mark on the dipstick with the
recommended oil type for your engine and expected ambient conditions.
(See engine Owner’s Manual for oil type and capacity, and more detailed oil
check/fill instructions.)
WARNING: Burn hazard
Never open oil fill port while engine is running. Hot oil can spray
over face and body.
˙

Operation (cont’d)
10
Fill Stump Grinder
Gasoline Tank
Check the gasoline level in the grinder’s fuel tank. If needed, fill tank with
fresh unleaded gasoline from a portable container, after first reading the
warnings and instructions below.
- Do NOT fill the gas tank to the top. Gasoline may spill when operating
on a slope.
- Do NOT overfill the gasoline tank. Allow at least 2.5 cm of empty
space below the fill neck to allow for fuel expansion.
WARNING:Gasoline fire/explosion hazard
Gasoline is highly flammable and explosive. Heat, sparks, and
flames can ignite gasoline vapors, which can become widespread
during fueling. A flash fire ignition and/or explosion could result
and cause serious injury or death. The following conditions could
result in gasoline ignition/explosion:
gas vapor collection inside enclosures
static electric sparks
sparks from electric wiring, batteries, or running engines
sources of heat (such as a hot engine or exhaust)
open flames, including pilot lights
Inspect Fuel
System / Check for
Leaks
Inspect fuel system & check for leaks BEFORE starting grinder.
WARNING: Fuel leak hazard
A leaking fuel line no matter how small can be the source of a fire or
explosion when starting or operating the engine.
Inspect the entire fuel system. Look for: Signs of leaks or deterioration,
chafed or spongy fuel hose, loose connections, loose or missing fuel
hose clamps, damaged gasoline tank, or defective gasoline shut-off
valve.
If grinder is in an enclosed area and you smell gas, DO NOT start
engine! DO NOT light a match. DO NOT flip on an electrical
switch. Exit area immediately leaving doors open and call fire
department.
Adjust Handle Bar
Handle bar may have to be adjusted to accommodate for the height of stump
or desired depth. When grinding above or below ground level, adjust handle
bar for better control and comfort. Note: Your stump grinder should not be
used more than 25 cm maximum below ground
Personal Protection
Use approved protective clothing and approved protective equipment
when using the machine.
1) Always wear ANSI-approved and OSHA-compliant safety glasses
with side shields and a full-face shield.
2) The use of ear plugs or other hearing protection device is also
recommended for persons working within 4.5-6 m of the running
grinder for longer than a few minutes. Hearing can be damaged from
prolonged, close-range exposure to the type of noise produced by this
grinder.

Operation (cont’d)
11
3) Wear long pants to protect legs from sparks, hot engine and flying
debris.
4) Never wear jewelry or loose-fitting clothing when starting or
operating the grinder or any mechanical device. Loose or dangling
apparel, jewelry or hair can become entangled in moving parts.
Trim Stump with
Saw
Cut or trim the stump preferably to ground level using a power saw.
Clear Area
Dig away the earth and remove any stones near the tree stump or roots that
may interfere with your work.
Work During
Daylight Hours
Only use the machine in daylight or in well-lit conditions. Never operate
the grinder after dark. Never operate the grinder in icy conditions or when
there is severe weather.
Battery Installation
Your stump grinder’s engine is equipped with an electric starter (depending on model), which
requires the installation of a 12-volt lawn tractor size battery (Group U1). See the Engine owner’s
manual for battery rating.
The battery is to be supplied by the customer and should be installed in the protective battery box
located near the engine. (The inside dimensions of the battery box are 22.5 cm L x 15 cm W x 21.5
cm H.) Follow the instructions detailed below for connecting and disconnecting the battery.
WARNING: Battery hazards
Batteries are hazardous because they contain caustic acid, can emit explosive gases, and can cause
electric shock. Caution must be exercised when making connections to a battery to avoid shock and
contact with the acid, and to prevent any sparking that could lead to an explosion.
ALWAYS follow the general battery safety rules and instructions listed below.
General Battery
Safety Rules
ALWAYS use eye protection when handling batteries.
NEVER smoke or work near sparks or other sources of ignition.
NEVER touch both battery terminals at the same time with your hand or
any non-insulated tools.
If battery acid contacts skin or clothing, flush immediately with water and
neutralize with baking soda.
Connecting the
battery
Always connect the cables in the following sequence to avoid possible shock:
1. Find the battery cables located inside the battery box.
2. Connect the red cable to the positive (+) terminal of the battery.
3. Then connect the black cable to the negative (-) terminal of the battery.

Operation (cont’d)
12
Disconnecting the
battery
Always disconnect cables in the following sequence to avoid possible shock.
1. First, disconnect the black cable from the negative (-) terminal of the
battery.
2. Next, disconnect the red cable from the positive (+) terminal of the
battery.
2. Starting the Grinder
After you have completed the pre-start checklist and procedures, you are ready to start the
grinder.
The following directions detail how to start the engine of your grinder.
WARNING:
Never attempt to use the grinder without proper protective equipment,
particularly eye protection and a full-face shield.
WARNING:
If you have an implanted medical device, consult a physician before using
this device.
To start the grinder:
Note: For additional engine starting instructions see your Honda/Kohler engine manual.
1) Before starting you should raise or lower the handle bar to a comfortable position to
accommodate the height of the stump you will be grinding.
2) Place stump machine into position with cutting blade near the front-top edge of the stump.
3) Using lever on handle to lock the one wheel brake.
Note: For tighter brake adjustment, turn knob on top of brake lever.
WARNING:
Stay in the OPERATOR POSITION while actuating controls. Never leave grinder unattended.
4) Pull Engine Switch ON. (Some models may have an additional on/off switch located on the
engine)
Safe Zone
Danger Zone
Operator
Position

Operation (cont’d)
13
5) Turn fuel valve on.
6) Pull choke if engine is cold. If engine is hot, do not use choke.
7) Grip operator presence bar & grinder handle bar together in left hand.
WARNING:
A rotating cutting blade is very dangerous. Stay at the controls and keep
others away until you are sure the blade has come to a complete stop.
WARNING:
Cutting wheel immediately begins rotating when starter is pulled. There
is no clutch or gear to separately start or stop cutter wheel.
8) Since the cutter wheel starts rotating when starter is activated, press down on handle bar to
lift cutter wheel off the ground.
9) A) Pull Start: Rapidly pull “Start” cord (recoil starter) with right hand several times until
engine starts. Allow starter cord to return slowly.
B) Electric Start: Turn Key switch to the START position and hold until the engine stars.
10)If engine does not start, repeat steps 5-8.
Handle bar
adjustment
Cutting
blade
Brake
lever
Operator
presence bar
Handle bar

Operation (cont’d)
14
3. Stopping the Engine
Stop the engine using the following steps:
1. While holding blade off ground, release the
operator presence bar. Wait until the blade
completely stops. Lower the blade so it is resting
against the ground.
2. Make sure brake is set before leaving the controls,
particularly if you are on an incline.
3. Turn engine switch to OFF position.
4. Allow the engine to cool for at least 5 minutes
before releasing brake and moving to storage or
transporting. A hot engine can be a fire hazard.
4. Grinding the Stump
WARNING: Flying Debris Hazard
Stones, chips, and debris can cause serious injury or property damage.
Debris can fly 23 meters in any direction out of the chute. They can bounce
off any fixed objects as well and hit operator, bystanders or breakable
objects.
1. Set/engage the brake.
2. Pivot the grinder toward the side of the stump, then lower it approximately 1.5 to 2.5 cm into the
front-top corner of the stump. Slowly pivot the cutting blade back and forth, lowering the
cutting blade approximately 1.5 to 2.5 cm before each sweep, until you have removed the front
portion of the stump to ground level.
WARNING: Rotating cutter wheel.
Keep hands and feet away. Contact with wheel rotating teeth will cause
serious personal injury.
3. Raise cutting blade until center of cutting blade is just above top of stump.
4. With cutting blade off to one side, advance the machine horizontally by releasing and resetting
the brake. Advance the machine forward to engage the cutting blade into the stump so that
when swept across the stump it will remove 1.5 to 2.5 cm of stump with each sweep.
5. Sweep the cutting blade across the stump, cutting away 1.5 to 2.5 cm of stump.
6. Advance cutting blade 1.5 to 2.5 cm, and sweep again across stump in opposite direction.
7. Continue sweeping cutting blade left and right across stump, advancing it before each sweep,
cutting 1.5 to 2.5 cm depth of stump with each sweep.
8. Cut complete stump flush with ground, then go back and cut to further depth, if desired.
Chip Build-up
9. When grinding larger stumps, chips may begin to build up under the wheels.
Operator
presence bar

Operation (cont’d)
15
Release brake and pull machine towards you so that the “chip pile” is directly under
the cutting wheel.
Drop cutter wheel down on “chip pile”, material will be discharged from machine
area.
WARNING: Flying Debris Hazard
Stones, chips, and debris can cause serious injury or property damage.
Debris can fly 23 meters in any direction out of the chute and bounce off
objects and hit operator, bystanders or breakable objects.
On these larger stumps, DO NOT allow grinder wheels to drop into stump hole. If a hole
is in the way of your progress, fill it with chips or change position.
WARNING:
Stop engine and set brake before leaving operator’s position. KEEP
BRAKE ENGAGED except when changing locations. Never attempt to ride
or stand on stump grinder.
10. When finished, stop the machine.
11. Pull machine away from stump, and rake chips away from stump.
5. Refueling
1) Before removing gas cap, turn engine off and allow to cool for at least two minutes.
Note: A running or hot engine can ignite fuel.
2) Remove grinder gasoline cap.
3) Add gasoline through the fill opening:
Direction of
grinding
Chip pile
Cutter wheel
NOT CORRECT
CORRECT
Wheel
Chip pile/debris
Hole

Operation (cont’d)
16
-Use only an UL-approved portable gasoline container to transfer the gasoline to the grinder’s
tank.
-Be aware of safety warning and instructions below for avoiding static electric caused fires.
WARNING:
Static electric spark hazard
A static electric spark can explosively ignite gasoline vapor, resulting in a flash fire that
could cause serious injury or death. See “Special Safety Information on Static Electricity”
at end of this manual.
4) Clean up gasoline spills /splashes immediately.
If possible, move the grinder away from spilled gasoline on the ground.
Wipe up spilled gasoline, and wait 5 minutes for excess gasoline to evaporate before starting
engine.
Gasoline soaked rags are flammable and should be disposed of properly.
If gasoline is spilled on your skin or clothes, change clothes and wash skin immediately.
5) Replace gasoline cap securely before starting engine.
6) Store extra gasoline in a cool, dry place in an UL-approved, tightly sealed container.
7) Filling towable units or portable containers at service stations:
Even if you have a towable unit, avoid static electric sparking while filling the
gasoline tank:
Never fill the grinder’s gas tank directly from the
fuel pump. The grinder’s tank is not grounded and
high velocity flow from the pump can cause static
electricity build-up. Use an approved portable
container to transfer gas to the grinder’s tank.
Use a portable container made of metal or
conductive plastic. This is preferred because it
dissipates static charge to ground more readily.
Never fill a portable gas container while it is sitting
inside a vehicle, trailer, trunk, or pick-up truck bed.
ALWAYS place container on the ground to be
filled.
Keep nozzle in contact with container while filling.
Do not use a nozzle lock-open device.
6. Storing the Grinder
When you are finished using the grinder and it has cooled, you must:
oCool engine before storage.
oClean the grinder.
oInspect for worn or damaged parts.
oChoose covered storage location.
oPrevent accidental starting.

Operation (cont’d)
17
oPlan on exercising the engine at least monthly unless the grinder is prepared for long-term
storage.
Detailed instructions are provided below.
Cool engine
Let engine cool for at least five minutes before storing. A hot engine can
be a fire hazard.
Clean grinder
Clean all grease, dirt, mud and other foreign matter from the machine.
Touch up paint damage to prevent rust.
Inspect grinder
Inspect the machine for worn or damaged parts and tighten any nuts or
screws that may have become loose. Pay particular attention to the
cutting teeth.
Choose a storage
location
Store the grinder in a location that is:
oClean and dry
oAway from sources of heat, open flames, sparks, or pilot lights, even
if the grinder’s gas tank is empty. Residual gasoline could ignite.
oAway from extreme high or low temperatures.
oCover it for extra protection
WARNING:
If stump grinder is left in direct sunlight and exposed to
extreme temperatures fuel hoses can degrade rapidly.
Remove key
Remove key from starter and secure key in a safe location, or remove
spark plug, in order to ensure the grinder cannot be started in a storage
location or by untrained persons or children.
Start grinder every
4 weeks
The grinder should be started regularly. At least every four weeks, start
the engine and let it run for 10 to 15 minutes.
Monthly exercising of the grinder will dry out any moisture that has
accumulated, lubricate cylinders, and clean out old gas in the carburetor.
Moisture, old gas, and dry mechanical parts cause deterioration in stored
engines.

Specifications
25
337-13H-CE
357-13HE-CE
620-20HE-CE
620-25KE-CE
ENGINE OPTIONS
Make
Honda
Honda
Honda
Kohler
Model
GX390UT1QAA2
GX390UT1QAE2
GX630RTXF2
CH730-0002
CC Rating
390 cc
390 cc
630 cc
721 cc
GENERAL
Weight
300 lbs. (136kg)
350 lbs. (169kg)
400 lbs (181kg)
400 lbs (181kg)
Length
58” (147cm)
58” (147cm)
58” (147cm)
58” (147cm)
Height
51” (130cm)
51” (130cm)
51” (130cm)
51” (130cm)
Width
32” (81 cm)
32” (81 cm)
32” (81 cm)
32” (81 cm)
RPM Operating
3600 RPM
3600 RPM
3600 RPM
3600 RPM
Type of Fuel
Gasoline
Gasoline
Gasoline
Gasoline
Starting
Recoil
Electric
Electric
Electric
Oil Sensor
Yes
Yes
Yes
Yes
CUTTER WHEEL
Diameter
14” (36cm)
14” (36cm)
14” (36cm)
14” (36cm)
Thickness
3/8” (.95cm)
3/8” (.95cm)
3/8” (.95cm)
3/8” (.95cm)
Bearings (Dia.) (2)
1-3/16” (3cm)
1-3/16” (3cm)
1-3/16” (3cm)
1-3/16” (3cm)
Teeth Pockets
Reversible
Reversible
Reversible
Reversible
Teeth (8)
(Carbide Tips)
Greenteeth®
Greenteeth®
Greenteeth®
Greenteeth®
1/2” dia. (1.27cm)
1/2” dia. (1.27cm)
3/4” dia. (1.9cm)
3/4” dia. (1.9cm)
1/4” thick (.635cm)
1/4” thick (.635cm)
1/4” thick (.635cm)
1/4” thick (.635cm)
Disc RPM
2200 RPM
2200 RPM
2500 RPM
2500 RPM
Drive
Direct Belt Drive
Direct Belt Drive
Direct Belt Drive
Direct Belt Drive
1 banded Gates belt
1 banded Gates belt
1 banded Gates belt
1 banded Gates belt
3 groove power band
with idler bearing
belt tensioners
3 groove power band
with idler bearing
belt tensioners
4 groove power band
with idler bearing
belt tensioners
4 groove power band
with idler bearing
belt tensioners
CUTTING CAPACITY
Above Grade
20” (51 cm)
Below Grade
16” (41 cm)
Stump Diameter
No Limit
NOISE AND VIBRATION DATA
Sound Pressure
94 dBA
92 dBA
103 dBA
Sound Power
104 dBA
102 dBA
113 dBA
Hand-Arm Vibration
4.32 m/s²
4.43 m/s²
4.27 m/s²
Standard Deviation
0.80 m/s²
0.75 m/s²
0.91 m/s²

Summary of Important Safety Information
26
This section provides a summary of the various safety procedures and measures that have been
presented throughout the manual. Keep this summary handy and refer to it to refresh your memory
about how to safely use your grinder.
WARNING
Carefully read and make sure you understand the following safety information before using
the grinder. Improper use or maintenance of the grinder can result in serious injury or
death from fire/explosion, carbon monoxide poisoning, lacerations, entanglement or
burns. Damage can also occur to windows, siding, vehicles, and bystanders from chips
and debris which can become projectiles.
General
Read manual. Read this Owner’s Manual and the engine Owner’s Manual completely before attempting to use and
service the grinder. Serious injury or death can result if safety instructions are not followed.
Instruct operators. The grinder owner or rental company must instruct all operators in safe grinder set-up and
operation. Do not allow anyone to operate the grinder who has not read the Owner’s Manual and been instructed on
its safe use. Make sure Owner’s manual is within the attached storage tube on the grinder.
Adults only. Only trained adults should operate and service the grinder. Do not let children operate.
Under the influence. Never operate, or let anyone else operate, the grinder while under the influence of alcohol,
drugs, or medication.
Intended use. Carefully read about and understand the intended use of this grinder. Do not use for other purposes, as
unforeseen hazards or equipment damage may result.
Controls and safety labels. Learn how to use the machine and it’s controls safely. Understand and follow all safety
labels.
Weather. Never use in foul, bad or questionable weather, which causes a slippery ground condition.
Prohibition Against Modifications
Never modify or alter the grinder in any way. Modifications can create serious safety hazards and will also void the
warranty.
Fuel/exhaust system. Never modify the exhaust system, fuel tanks, or fuel lines. Carbon monoxide poisoning, fire,
or explosion could result.
Guards. Do not operate grinder unless all guards and cover shields, which prevent access to moving parts and pinch
points, are in place. Failure to guard the power transmission mechanisms may result in serious injury or death.
Safety –Before Use
Know how to operate
Review safety rules. Before use of this grinder, review the “Rules for Safe Operation.”
Know how to operate. Be thoroughly familiar with all controls and with the proper use of the equipment. Know
how to stop the grinder quickly if needed.
Utility marking. Call 811 for utility marking 3 days before stump grinding. Trees can grow on top of and around
underground wiring that was installed many years before a tree was planted.
Getting Ready
Flying debris. Clear area of objects such as stones, toys, steel wire, etc. that could become caught in moving machine
parts and ejected as a projectile.
Operate OUTSIDE only –dangerous carbon monoxide exhaust! Grinders give off carbon monoxide exhaust, a
poisonous gas that can kill. You CANNOT smell it, see it, or taste it. ONLY run grinder OUTDOORS and away
from building air intakes. NEVER run grinder engine inside homes, garages, sheds, or other semi-enclosed spaces.
These spaces can trap poisonous gases.
Cooling ventilation. The grinder needs adequate, unobstructed flow of air to allow for proper cooling of engine and
grinder head. Do not allow debris to accumulate and block airflow.

Summary of Important Safety Information (cont’d)
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Transporting. During transporting, take precautions to make sure stump grinder will not tip over and cause a fuel
leak hazard.
Hot exhaust - fires. Exhaust from engine can be extremely hot and cause fire. Position muffler at least 2 meters
from combustible objects during operation.
Fire extinguisher. Keep a fire extinguisher rated “ABC” by the National Fire Protection Association nearby is always
recommended when using gasoline operated machinery. Keep it properly charged and be familiar with its use.
Personal protective equipment
Hearing protection. The use of ear plugs or other hearing protection device is recommended for those in close
proximity to the grinder while it is operating.
Eye protection. Wear ANSI approved eye protection when operating the grinder.
Face protection. A helmet with a full face visor or mesh visor with protective glasses is recommended.
Loose / dangling. Loose or dangling apparel, jewelry or hair can become entangled in moving parts. Never wear
jewelry or loose-fitting clothing when operating the grinder.
Long pants. Wear long, heavy-duty pants to protect legs from ejected materials.
Gasoline Safety
Gasoline is highly flammable and explosive. You can be burned or seriously injured when handling fuel. Use extreme
care when handling gasoline:
Fuel outdoors. Fill fuel tank outdoors –never indoors. Gasoline vapors can ignite if they collect inside an enclosure.
Explosion can result.
Use approved container. Never pump fuel directly into engine at gas station. Static charge can build and ignite fuel.
Use an UL approved fuel container to transfer gas to the engine.
Running / hot engine. A running engine is hot enough to ignite fuel. Never add fuel or remove gas cap if engine is
running or still hot. Stop the engine and allow to cool at least two minutes before adding fuel.
Heat / flames / sparks. Keep sources of heat, flame, or sparks away while adding fuel.
Don’t fill to the top DO NOT overfill the gas tank. Allow at least 2.5 cm of empty space below the fill neck to allow
for fuel expansion and operation on slopes.
Don’t fill to the top. Do not fill the gas tank to the top. Gasoline may spill when operating on a slope.
Replace cap. Replace gas cap securely before starting engine.
Spills. Clean up fuel spills immediately. Move grinder away from spilled fuel on the ground. Wipe fuel off engine
and wait 5 minutes for excess fuel to evaporate before starting engine. Gas soaked rags should be disposed of
properly.
On skin / clothes. If gasoline is spilled on your skin or clothes, change clothes and wash skin immediately.
Inspect fuel system. Check fuel system on a regular basis. Look for signs of leaks, deterioration, chafed or spongy
fuel hose, loose or missing fuel hose clamps, damaged fuel tank, or a defective fuel shut-off valve. Do not start
grinder until needed repairs have been completed.
Gasoline storage. Store gasoline in a cool, dry place in an UL-approved, tightly sealed container away from
children.
Safety –During Use
Safety equipment / controls. Always operate the grinder with all safety covers, guards, and barriers in place and in
good working order, and all controls properly adjusted for safe operation.
Controls. Stay in the OPERATOR POSITION while actuating controls.
Know how to stop. Know how to stop the grinder quickly if needed by releasing the operator presence bar. If this
does not work, do the following in order until unit is stopped. 1. Push the stop button on the control panel. 2. Use
on/off switch on engine (or ignition switch on electric start models). 3. Engage full choke by flooding the engine.
“Kickback”. Machine can experience significant “kickback” when operating or first coming into contact with the
stump.
Slipping/Falling. Operating in wet or icy conditions could lead to losing your footing and slipping or falling.
Damaged. Do not operate the grinder with damaged, missing, incorrectly adjusted, or broken parts.
Check for gas leak before starting. After opening gasoline valve, smell for gas before starting engine. If you smell
gas, DO NOT start engine. DO NOT light a match. DO NOT flip on an electrical switch. Exit area immediately and
call fire department.
Carbon monoxide exhaust. The running engine gives off carbon monoxide, a poisonous gas that can kill you. You
CANNOT smell it, see it, or taste it. If you start to feel sick, dizzy, or weak while using the grinder, shut off the
engine and get to fresh air RIGHT AWAY. See a doctor. You may have carbon monoxide poisoning.

Summary of Important Safety Information (cont’d)
28
Other exhaust dangers. This product contains or emits chemicals known to the State of California to cause cancer,
birth defects or other reproductive harm. Avoid inhalation of exhaust.
Smoking/sparks. Never smoke near the running grinder, and never operate near sources of sparks or flames.
Hot muffler. Never touch hot muffler or hot exhaust manifold. Exhaust and engine parts can be very hot and will
burn you.
Machine’s moving parts. Keep hands, feet, and apparel away from drive belts, cutter wheel, and other moving parts.
Never remove any drive belt or guard while the unit is operating. Contact with belt or rotating teeth will cause
personal injury.
Refueling. DO NOT refuel the engine until it has cooled at least two minutes.
Malfunction during operation. Always shut the machine off if any unusual noise or vibration occurs.
Vibration. Overexposure to machine vibration on a daily basis may lead to circulatory or nerve damage.
Adjusting / repairing. Always turn off grinder and remove spark plug or spark plug wire before working on the
grinder to prevent accidental starting. Disconnect battery (on electric models only).
Safety –After use
Cool engine before storing. Let engine cool for at least five minutes before storing. A hot engine can be a fire
hazard.
Shut off fuel supply. Make sure gasoline shut-off valve is in the OFF position.
Prevent accidental starting. When grinder is not in use, remove key from starter (electric start engines) and secure
in a safe location, or remove spark plug and disconnect positive battery terminal from battery in order to ensure that
grinder cannot be started in a storage location or by untrained persons.
Storage location. Store the grinder in a dry location away from sources of heat, open flames, sparks or pilot lights –
such as water heaters, space heaters, furnaces, clothes dryers, or other gas appliances –EVEN IF the grinder’s gas
tank is empty. Residual gasoline could ignite.
Exercise regularly. Exercise grinder every four weeks to dry out moisture that accumulates in the windings. If
grinder cannot be exercised on a regular basis, prepare grinder for long term storage.
Safety - Inspection/Maintenance
Inspect and maintain your grinder on a regular basis and repair as needed to keep it in safe working condition:
Turn off grinder. Always turn off grinder and remove spark plug or spark plug wire before working on the engine or
grinder to prevent accidental starting. Disconnect battery (on electric models only).
Replace guards / shields. Make sure all guards and shields are replaced after servicing the grinder.
Burns. Do not touch hot muffler. Muffler will be hot even if unit is stopped. Allow unit to cool before servicing.
Replacement parts. If a part needs replacement, only use parts that meet the manufacturer’s specifications.
Replacement parts that do not meet specifications may result in a safety hazard or poor operation of the grinder and
will void the warranty and CE certification.