Dirty Hand Tools 106779 User manual

21 Inch Lawn Mower
is safety alert symbol identies important safety messages in
this manual. Failure to follow this important safety information
may result in serious injury or death.
MODEL # 106779
Operation Manual
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Part # 106868 Rev A

Table of Contents
Important Safety Information .....................................................4
Unpacking and Setup .....................................................................7
Filling with Gasoline and Oil ........................................................8
Operation ......................................................................................9
Maintenance ................................................................................10
Troubleshooting ..........................................................................11
Warranty and Specifications..........................................Back Cover
1100 W 120th Ave, Suite 600
Westminster, CO 80234 • 720-287-5182
For Service or Questions
Call 1-877-487-8275
720-287-5182
www.dirtyhandtools.com
Dirty Hand Tools® is a brand of
2

Important Safety Information
WARNING: Read and thoroughly understand all instructions
and safety information before assembling or operating this lawn
mower. Failure to do so may cause serious injury or death. Do
not allow anyone to operate this lawn mower who has not read
this manual. As with all power equipment, a lawn mower can
be dangerous if assembled or used improperly. Do not operate
this lawn mower if you have doubts or questions concerning safe
operation.
Call our customer service department at 720-287-5182,
1-877-487-8275, or visit www.dirtyhandtools.com if you have any
questions or concerns about the safe operation of this equipment.
Intended Use
Do Not Use the lawn mower for any purpose other than for which
it was designed. Any other use is unauthorized and may result in
serious injury or death.
Personal Protective Equipment
When operating this lawn mower it is essential that you wear
safety gear including goggles or safety glasses, adequate clothing
including long pants, tight fitting gloves (no loose cuffs or draw
strings). Always wear ear plugs or sound deafening headphones
to protect against hearing loss when operating this lawn mower.
Always wear sturdy footwear. Never wear sandals, sneakers or open
shoes, and never operate the lawn mower with bare feet. Do not
wear loose clothing that might get caught in moving parts.
Whenever you need to make any adjustments or remove grass or
debris from the underside of the deck, always shut o the engine
and wait ve (5) minutes to allow parts to cool. Disconnect the
spark plug wire and keep the wire away from the spark plug to
prevent accidental starting.
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WARNING
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DANGER
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CAUTION
3

Important Safety Information
General Safety
Failure to follow warnings, cautions, assembly and operation
instructions in the Operation Manual may result in serious injury
or death.
READ THE OPERATION MANUAL BEFORE
OPERATION.
• Do not permit children to operate this equipment at any time.
Do not permit others that have not read and understood the
complete Operation Manual to operate this equipment.
• Keep all people and pets a minimum of 10 feet away from the
work area when operating this lawn mower.
• Do not operate the lawn mower when under the influence of
alcohol, drugs or medication.
• Do not allow a person who is tired or otherwise impaired or not
completely alert to operate the lawn mower.
CAREFULLY INSPECT THE AREATO BE MOWED
AND REMOVE ALL FOREIGN OBJECTS.
• Stop the lawn mower when crossing gravel or loose pebbles.
• Never operate the lawn mower on a slippery, wet, or muddy
surface.
• Always operate the lawn mower from behind the handlebars.
Never pass or stand on the discharge side of the machine when
the engine is running or cutting cords are spinning.
• Never, under any conditions, remove, bend, cut, fit, weld, or
otherwise alter standard parts on the lawn mower.
• If the lawn mower strikes a foreign object or if your machine
should start making an unusual noise or vibration, stop the
engine and wait five (5) minutes for all moving parts to come to a
complete stop and cool.
• Be cautious when using your lawn mower around fencing, wires,
ropes, and hoses.
• Use caution when approaching blind corners, shrubs, trees, or
other objects that may block your view.
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DANGER
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DANGER
4

107024
Important Safety Information
• Never run the lawn mower in an enclosed area or
without proper ventilation as the exhaust from
the engine contains carbon monoxide, which is an
odorless, tasteless, and deadly poisonous gas.
• Fill the gasoline tank outdoors with the engine off
and allow the engine to cool completely.
• Do not operate the lawn mower with the air cleaner
or cover over the carburetor air-intake removed,
except for adjustment. Removal of such parts could
create a fire hazard.
• e muer and engine become very hot with use
and can cause a severe burn; do not touch. Allow the
engine to cool before refueling, doing maintenance,
or making adjustments.
Safety Decals
Safety labels on the lawn mower are to remind you
of important information while you are operating the
unit. Make sure all safety warning decals are attached
and in readable condition. Replace missing or defaced
decals. Contact Dirty Hand Tools at 1-877-487-8275
for replacement decals.
5

Explanation of Icons
e following symbols are found on warning label(s) on the
product which are a reminder of potential safety hazards for the
operator and bystanders.
Attention: Safety Alert
warns of a potential
personal safety hazard.
Read the Operation
Manual before attempting
to use this product.
Objects may be thrown by this
product that may result in personal
injury or property damage.
Do not use on slopes
greater than 15° incline.
Mow across instead of
up and down slopes.
Danger sharp object; keep hands and feet away from
rotating parts; keep hands and feet away from blade.
Remove objects in mower’s
path that could be thrown
by the mowers blade.
Remove the spark plug
cable before performing
maintenance.
Keep all
children and
bystanders away.
Look behind while
backing up.
Hot Surface! Risk of burn injury!
To avoid injury avoid contact with
muffler and other hot surfaces.
Keep hands and feet
away from blade and
cutting areas.
6

Unpacking and Setup
Your lawn mower is assembled at the factory and shipped with the
handlebar folded forwards. Loosen both adjustment knobs and
align the handlebar both sides to a comfortable operating position.
Tighten the adjustment knobs securely.
SAFETY
CONTROL BAR
MUFFLER
RECOIL
STARTER
GASOLINE
FUEL FILL
OIL FILL
HANDLEBAR
ADJUSTMENT
UPPER
HANDLEBAR
ASSEMBLY
DISCHARGE
CHUTE
AIR FILTER
COVER
LOWER
HANDLEBAR
ASSEMBLY
2-1/2 CUBIC FT
GRASS
CATCHER
HEIGHT
ADJUSTMENT
KNOB
GRASS
CATCHER
RELEASE
DISCHARGE
DEFLECTOR
7

Filling with Gasoline and Oil
ADD OIL BEFORE STARTING THE ENGINE
e lawn mower is shipped without uids installed.
Keep the caps on the fuel and oil fills until you are ready to pour
either gasoline or oil into the correct fill.
Please refer to your Engine Owner’s Manual for detailed
information on oil quantity and cold temperature oil specifications.
1. Place the machine on a level surface and initially add 1/2 of
the SAE 30 high detergent oil into the oil fill and wait one (1)
minute for the oil to settle.
2. Check the dipstick and continue adding a few ounces of oil at a
time, rechecking the dipstick until the oil reaches the fill mark.
Be careful not to overfill.
3. Fill the fuel tank with fresh, unleaded gas (min. 85 Octane),
to 1/4” from the top of the ll neck to allow for expansion. Be
careful not to overll and reinstall the cap before starting the
engine.
ALWAYS FILL THE TANK WITH
ENGINE OFF AND COOL.
ALWAYS CHECK THE OIL LEVEL
BEFORE OPERATING.
Allow the engine to cool for at least two minutes before removing
the fuel cap.
Before performing any adjustments or any other procedure or
inspection, stop the engine, wait five minutes to allow parts to
cool. Disconnect the spark plug wire, keeping it away from the
spark plug. Contact with internal rotating parts will cause serious
personal injury. Never put hands, face, feet, or clothing under the
mower deck or discharge opening at any time.
!
WARNING
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WARNING
8

Operation
CHECK THE ENGINE OIL LEVEL
Check fuel level. Remove any debris from around the underside
of the lawn mower.
Starting
1. Pull the safety control bar up towards the handlebar and
continue to hold while pulling the recoil handle.
2. Grasp the recoil starter and slowly pull until you feel resistance.
Let the cord retract a little bit and then pull the cord rapidly to
start the engine. One or two pulls usually starts the lawn mower.
Releasing the safety control bar stops the engine.
If the engine fails to start after several pulls of the recoil starter,
allow the motor to cool down. Check the cause of hard starting;
see the troubleshooting guide.
Stopping the Engine
1. Releasing the safety control bar automatically stops the engine.
e lawn mower can easily throw debris at great velocity, which
could cause personal injury or property damage. Do not run the
mower over loose gravel, sand or debris that can be expelled.
e lawn mower discharges cut material to the right. Always
try to mow with the uncut tall grass or weeds on the left.
• Always check your work area before mowing and remove any
debris that might tangle or damage the machine.
• If you do run into debris and the mower stops running or
becomes tangled, turn off the engine and disconnect the spark
plug wire before attempting to dislodge the debris.
Adjusting the Cutting Height
1. Pull the height adjustment knob up or down to the desired
cutting height.
Attaching the Discharge Chute
1. Use the discharge chute to expel grass from the right side.
2. Pull upwards on the discharge deflector. e discharge chute
attaches to the bars on the deflector when raised.
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CAUTION
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WARNING
9

Maintenance
Before performing any maintenance stop the engine, wait ve
(5) minutes to allow all parts to cool. Disconnect the spark plug
wire, keeping it away from the spark plug.
Regular maintenance is the way to ensure the best performance
and long life of your machine. Please refer to this manual and the
engine manufacturer’s owner’s manual for maintenance procedures.
Maintenance Before Every Every
Procedure Each Use 25 Hours of Use 100 Hours of Use
Check engine oil level X
Check general equipment condition X
including nuts, bolts, welds, etc.
Check the cutting blade for sharpness or X
for excessive wear
Change the engine oil e first time X
after 5 hours of use
Replace the air filter cartridge. X
Replace spark plug X
Maintenance Checklist
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WARNING
Changing the Oil
NOTE: Drain the oil when the engine is warm. Warm oil drains
quickly and completely.
1. For convenience, place the machine up on a wooden pallet or
workbench.
2. Remove the oil cap/dipstick and position a suitable oil receptacle
beside the oil fill tube.
3. Make sure to securely tighten the gas fill cap.
4. Using the handle of the trimmer/mower, tip the machine to drain
the oil out through the oil filler tube into a suitable receptacle.
10

11
PROBLEM SOLUTION
Recoil will not pull out or is dicult to pull. • Check the engine oil level.
(Refer to the engine Owner’s Manual) • ere may be an oil compression lock in the cylinder. Take
out the spark plug; hold a rag over the spark plug hole and
pull the recoil cord several times to blow out any oil in the
cylinder. Wipe off the spark plug and reinstall it.
• e recoil may be broken or jammed.
e engine will not start. • Check for proper attachment of the spark plug wire.
• Check that the engine has the right amount of clean oil. If
the oil is dirty, change it following the procedure on page 10.
• Use only fresh, clean, unleaded gas. If the gas is old, change
it. Use a fuel stabilizer to keep gas longer than one month.
• Check that the air filter is clean.
• Make sure that the spark plug is clean. If the spark plug is
dirty or cracked, change it. If it is oily, leave it out, hold a
rag over the spark plug hole and pull the recoil cord several
times to blow out any oil in the cylinder, then wipe off the
spark plug and reinsert it.
Engine smokes. • Check the oil level and adjust as needed.
• You may be operating the machine on too great an incline.
• Check the air filter and clean or replace if needed.
• You may be using the wrong oil - too light for the
temperature. Refer to your engine Owner’s Manual for
detailed information.
Visit our web site at www.dirtyhandtools.com or call
1-877-487-8275 for assistance.
Troubleshooting
BEFORE PERFORMING ANY MAINTENANCE
PROCEDURE STOPTHE ENGINE,WAIT FIVE 5
MINUTES TO ALLOW ALL PARTS TO COOL.
Disconnect the spark plug wire,
keeping it away from the spark plug.
!
WARNING

Warranty & Specications
IMPORTANT NOTICE
We, the manufacturer, reserve the right to change the product and/
or specifications in this manual without notification. e manual is for
information usage only and the pictures and drawings depicted herein are
for reference only.
Warranty Repair and Service
Do not return this product to the store for warranty issues or repair. Call
our customer service department at 720-287-5182, 1-877-487-8275, or
visit www.dirtyhandtools.com for the location of the nearest service center.
Record the information below for future reference.
Model No.
Serial No.
Date of Purchase
Place of Purchase
SKU/Part No. 106779
Description 21 Inch Lawn Mower
Engine 4.4HP/160cc Honda GCV160 Engine*
EPA/50 State Approved
Engine Speed 3100 rpm
Cutting Width 21 Inches
Cutting Height 1.18” - 3.15” (31 - 85mm)
Cutting Height Positions 7
Cutting Options 4 in 1
Catcher Volume 2.5 Cubic Feet
Wheel Size 7.5” dia. (front), 10.5” dia. (rear)
Dimensions 65”L x 30”W x 44”H (1651x762x1118mm)
Weight 84.7 Lbs. (38.5Kg)
Warranty 2 Year Limited Warranty/3 Year Engine Warranty
*As rated by engine manufacturer
1100 W 120th Ave., Suite 600
Westminster, CO 80234 • 720-287-5182
Dirty Hand Tools® is a brand of For Service or Questions
Call 1-877-487-8275
720-287-5182
www.dirtyhandtools.com