Echo PB-7910T User manual

X7501201800
© 10/23 ECHO Incorporated
Operator’s
Manual
PB-7910 H/T
Power Blower
The engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth defects,
or other reproductive harm.
Read and understand all provided literature before
use. Failure to do so could result in serious injury.
Note: This product complies with CAN ICES-2/NMB-2.

TABLE OF CONTENTS PB-7910 H/T
2 X7501201800
© 10/23 ECHO Incorporated
TABLE OF CONTENTS
Introduction ................................................................................................. 3
Servicing Information .................................................................................. 3
Parts and Serial Number...................................................................... 3
Service................................................................................................. 4
ECHO Consumer Product Support...................................................... 4
Product Registration ............................................................................ 4
Additional Literature............................................................................. 4
Safety.......................................................................................................... 5
Manual Safety Symbols and Important Information............................. 5
International Symbols .......................................................................... 6
Personal Condition and Safety Equipment .......................................... 8
Equipment.......................................................................................... 13
Emission Control (Exhaust & Evaporative) .............................................. 14
EPA Emissions Control Information ................................................... 14
Description ................................................................................................ 15
Contents.................................................................................................... 19
Assembly................................................................................................... 20
Install Blower Pipes and Stick Handle ............................................... 20
Install Blower Pipes............................................................................ 22
Operation .................................................................................................. 24
Fuel.................................................................................................... 25
Starting Cold Engine.......................................................................... 28
Starting Warm Engine........................................................................ 30
Stopping Engine ................................................................................ 31
Operating Blower ............................................................................... 32
Maintenance ............................................................................................. 34
Skill Levels ......................................................................................... 35
Maintenance Intervals........................................................................ 35
Air Filter ............................................................................................. 37
Fuel Filter........................................................................................... 38
Spark Plug ......................................................................................... 39
Cooling System.................................................................................. 39
Exhaust System................................................................................. 41
Carburetor Adjustment....................................................................... 43
Throttle Cable Adjustment (PB-7910T only) ...................................... 45
Troubleshooting ........................................................................................ 46
Storage ..................................................................................................... 48
Long Term Storage (Over 30 Days)................................................... 48
Specifications............................................................................................ 49
Product Registration.................................................................................. 50

PB-7910 H/T INTRODUCTION
X7501201800 3
© 10/23 ECHO Incorporated
INTRODUCTION
Specifications, descriptions, and illustrative material in this literature are as
accurate as possible. Specifications are subject to change without notice.
Illustrations might include optional equipment and accessories, and might
not include all standard equipment. Your equipment might appear slightly
different than pictured equipment.
Read and understand all provided literature.
Literature contains specifications and
information for safety, operation,
maintenance, storage, and assembly
specific to this product. Scan QR codes for
more information.
For additional literature, including safety manuals where applicable, or
questions regarding terms used in this manual, visit:
https://www.echo-usa.com/manuals
OR
https://www.shindaiwa-usa.com/manuals
SERVICING INFORMATION
Parts and Serial Number
Genuine ECHO parts and
assemblies for your ECHO products
are available only from an
Authorized ECHO Dealer. When
you do need to buy parts, always
have the model number and serial
number of the unit with you. For
future reference write them in the
space provided below.
Model No. _____________________ Serial No. ____________________

SERVICING INFORMATION PB-7910 H/T
4 X7501201800
© 10/23 ECHO Incorporated
Service
Service of this product during the warranty period must be performed by an
Authorized ECHO Service Dealer. For the name and address of the
Authorized ECHO Service Dealer nearest you, ask your retailer or call:
1-800-432-ECHO (3246). Dealer information is also available on our Web
Site www.echo-usa.com. When presenting your unit for Warranty service/
repairs, proof of purchase is required.
ECHO Consumer Product Support
If you require assistance or have questions concerning the application,
operation, or maintenance of this product, call the ECHO Consumer
Product Support Department at 1-800-432-ECHO (3246) from 8:00 a.m. to
5:00 p.m. (Central Standard Time) Monday through Friday. Before calling,
please know the model and serial number of your unit.
Product Registration
Register your ECHO equipment online at www.echo-usa.com or by filling
out the product registration sheet included in this manual. Registering your
product confirms warranty coverage and provides a direct link to ECHO if
we find it necessary to contact you.
Additional Literature
In addition to finding information online, information is available from your
Authorized ECHO Service Dealer, or by contacting ECHO Incorporated,
400 Oakwood Road, Lake Zurich, IL 60047, 1-800-432-ECHO (3246).

PB-7910 H/T SAFETY
X7501201800 5
© 10/23 ECHO Incorporated
SAFETY
Manual Safety Symbols and Important Information
Throughout this manual and on the product itself, you will find safety alerts
and helpful, informational messages preceded by symbols or key words.
The following is an explanation of those symbols and key words and what
they mean to you.
The safety alert symbol accompanied by the word “DANGER”
calls attention to an act or condition which WILL lead to serious
personal injury or death if not avoided.
The safety alert symbol accompanied by the word “WARNING”
calls attention to an act or condition which CAN lead to serious
personal injury or death if not avoided.
The safety alert symbol accompanied by the word “CAUTION”
calls attention to an act or condition which might lead to minor
or moderate personal injury if not avoided.
The enclosed message provides information necessary for the
protection of the unit.
Note: This enclosed message provides tips for use, care and
maintenance of the unit.
CIRCLE AND SLASH SYMBOL
This symbol means the specific action shown is prohibited.
Ignoring these prohibitions can result in serious or fatal injury.

SAFETY PB-7910 H/T
6 X7501201800
© 10/23 ECHO Incorporated
International Symbols
Symbol Description Symbol Description
Read and
Understand the
Operator’s Manual
Carburetor
Adjustment - High
Speed Mixture
Wear Eye, Ear and
Head Protection
Carburetor
Adjustment - Idle
Speed
Wear Hand
Protection
Carburetor
Adjustment - Low
Speed Mixture
Safety/Alert Stop Switch
Hot Surface Fuel and Oil
Mixture
Idle speed Fast speed
Finger severing Purge Bulb
DO NOT Allow
Flames or Sparks
Near Fuel
Ignition
ON / OFF
H
T
L
STOP
Ignition
OFF
ON

PB-7910 H/T SAFETY
X7501201800 7
© 10/23 ECHO Incorporated
Note: Not all symbols will appear on your unit.
DO NOT Smoke
Near Fuel
Choke Control
“COLD START”
Position (Choke
Closed)
Choke Control
“RUN” Position
(Choke Open)
Wear Slip
Resistant
Footwear
Beware of thrown objects
Keep Bystanders and Helpers
Away 15 m (50 ft.).
Symbol Description Symbol Description

SAFETY PB-7910 H/T
8 X7501201800
© 10/23 ECHO Incorporated
Personal Condition and Safety Equipment
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
The muffler or catalytic muffler and surrounding cover
may become extremely hot. Always keep clear of
exhaust and muffler area, otherwise serious personal
injury might occur.
Users of this product risk injury to themselves and others if the
unit is used improperly and/or safety precautions are not
followed. Proper clothing and safety gear must be worn when
operating unit.
Physical Condition
Your judgment and physical dexterity may not be good:
• If you are tired or sick
• If you are taking medication
• If you have taken alcohol or drugs
Operate unit only if you are physically and mentally well.
Eye Protection
Eye protection that meets ANSI Z87.1 or CE requirements
must be worn whenever you operate the unit.
For additional safety, a full-face shield can be worn over
safety glasses or goggles to provide protection from sharp
branches or flying debris.

PB-7910 H/T SAFETY
X7501201800 9
© 10/23 ECHO Incorporated
Hand Protection
Wear sturdy, no-slip, rubber work gloves to improve your grip on the
handles. Gloves also provide protection against cuts and scratches, cold
environments, and reduce the transmission of machine vibration to your
hands.
Hearing and Ear Protection
ECHO recommends wearing personal protective equipment whenever unit
is used.
Breathing Protection
Operators who are sensitive to dust or other common airborne allergens
may need to wear a dust mask to prevent inhaling these materials while
operating unit. Dust masks can provide protection against dust, plant debris,
and other plant matter such as pollen. Make sure the mask does not impair
your vision, and replace the mask as needed to prevent air restrictions.
Proper Clothing
Wear snug-fitting, durable clothing:
• Pants should have long legs, shirts should have long sleeves.
• DO NOT WEAR SHORTS.
• DO NOT WEAR TIES, SCARVES, JEWELRY, or clothing with loose or
hanging items that could become entangled in moving parts or
surrounding growth.
• Keep clothing buttoned or zipped, and keep shirt tails tucked in.
• Wear sturdy work shoes with nonskid rubber soles.
• DO NOT WEAR OPEN TOED SHOES.
• DO NOT OPERATE UNIT WITH BARE FEET.
Keep long hair away from engine and air intake. Retain hair with cap or net.
Heavy protective clothing can increase operator fatigue, which may lead to
heat stroke. Schedule heavy work for early morning or late afternoon hours
when temperatures are cooler.

SAFETY PB-7910 H/T
10 X7501201800
© 10/23 ECHO Incorporated
The components of this machine generate an electromagnetic
field during operation, which can interfere with some
pacemakers. To reduce the risk of serious or fatal injury,
persons with pacemakers should consult with their physician
and the pacemaker manufacturer before operating this
machine. In the absence of such information, ECHO does not
recommend the use of this machine by anyone who has a
pacemaker.
Extended Operation and Extreme Conditions
Prolonged exposure to cold and/or vibration can result in injury.
Read and follow all safety and operation instructions to
minimize risk of injury. Failure to follow instructions can result
in painful wrist/hand/arm injuries.
It is believed that a condition called Raynaud’s Phenomenon, which affects
the fingers of certain individuals, may be brought about by exposure to
vibration and cold. Exposure to vibration and cold may cause tingling and
burning sensations, followed by loss of color and numbness in the fingers.
The following precautions are strongly recommended, because the
minimum exposure, which might trigger the ailment, is unknown.
• Keep your body warm, especially the head, neck, feet, ankles, hands, and
wrists.
• Maintain good blood circulation by performing vigorous arm exercises
during frequent work breaks, and also by not smoking.
• Limit the hours of operation. Try to fill each day with jobs where operating
the unit or other hand-held power equipment is not required.
• If you experience discomfort, redness, and swelling of the fingers
followed by whitening and loss of feeling, consult your physician before
further exposing yourself to cold and vibration.

PB-7910 H/T SAFETY
X7501201800 11
© 10/23 ECHO Incorporated
Repetitive Stress Injuries (RSI)
It is believed that overusing the muscles and tendons of the fingers, hands,
arms, and shoulders may cause soreness, swelling, numbness, weakness,
and extreme pain in those areas. Certain repetitive hand activities may put
you at a high risk for developing a Repetitive Stress Injury (RSI). An
extreme RSI condition is Carpal Tunnel Syndrome (CTS), which could occur
when your wrist swells and squeezes a vital nerve that runs through the
area. Some believe that prolonged exposure to vibration may contribute to
CTS. CTS can cause severe pain for months or even years.
To reduce the risk of RSI/CTS, do
the following
• Avoid using your wrist in a bent,
extended, or twisted position.
Instead try to maintain a straight
wrist position. Also, when
grasping, use your whole hand,
not just the thumb and index
finger.
• Take periodic breaks to minimize
repetition and rest your hands.
• Reduce the speed and force with
which you do the repetitive
movement.
• Do exercises to strengthen the
hand and arm muscles.
• Immediately stop using all power equipment and consult a doctor if you
feel tingling, numbness, or pain in the fingers, hands, wrists, or arms. The
sooner RSI/CTS is diagnosed, the more likely permanent nerve and
muscle damage can be prevented.
All over head electrical conductors and communications wires
can have electricity flow with high voltages. This unit is not
insulated against electrical current. Never touch wires directly
or indirectly, otherwise serious injury or death can result.
Do not operate this product indoors or in inadequately
ventilated areas. Engine exhaust contains poisonous emissions
and can cause serious injury or death.

SAFETY PB-7910 H/T
12 X7501201800
© 10/23 ECHO Incorporated
Read the Manual
• Provide all users of this equipment with literature for instructions on safe
operation.
Clear the Work Area
• Clear the area of children, bystanders, and pets. At a minimum, keep all
children, bystanders, and pets outside a 15 m (50 ft.) radius; outside the
15 m (50 ft.) zone, there is still a risk of injury from thrown objects.
Bystanders should be encouraged to wear eye protection. If you are
approached, stop the engine.
• Avoid blowing debris towards people, pets, open windows, or vehicles
when using unit.
• Review area to be cleared. Look for potential hazards such as stones or
metal objects.
Keep a Firm Grip
• To prevent from dropping the unit, hold the handle in one hand, with
thumb and fingers encircling the handle.
Keep a Solid Stance
• Maintain footing and balance at all times. Do not stand on slippery,
uneven or unstable surfaces. Do not work in odd positions or on ladders.
Do not over reach.
Avoid Hot Surfaces
• Keep exhaust area clear of flammable debris.
Avoid contact during and immediately after
operation.

PB-7910 H/T SAFETY
X7501201800 13
© 10/23 ECHO Incorporated
Equipment
Use only approved attachments. Serious injury can result from
the use of a non-approved attachment combination. ECHO
Incorporated will not be responsible for the failure of cutting
devices, attachments or accessories which have not been
tested and approved by ECHO. Read and comply with all safety
instructions listed in this manual.
Do not attempt to modify this product. Serious injury can
result from the use of any modified product.
Check unit for loose/missing nuts, bolts, and screws.
Tighten and/or replace as needed.
Do not use blower if any part is missing or damaged.
Have repairs done only by an authorized service dealer.
Moving parts can amputate fingers or cause severe injuries.
Keep hands, clothing and loose objects away from all openings.
ALWAYS stop engine, disconnect spark plug, and make
sure all moving parts have come to a complete stop before
removing obstructions, clearing debris, or servicing unit.
DO NOT start or operate unit unless all guards and
protective covers are properly assembled to unit.
NEVER reach into any opening while the engine is running.
Moving parts might not be visible through openings.
Periodically check fuel system (fuel lines, vent, grommet, fuel
tank, and fuel cap) for leaks especially if the unit is dropped. If
damage or leaks are found, do not use unit, otherwise serious
personal injury or property damage may occur. Have unit
repaired by an authorized servicing dealer before using.

EMISSION CONTROL PB-7910 H/T
14 X7501201800
© 10/23 ECHO Incorporated
EMISSION CONTROL (EXHAUST &
EVAPORATIVE)
EPA Emissions Control Information
The emission control system for
the engine is EM (engine
modification) and, if the second to
last character of the Engine Family
on the Emission Control
Information label (see example) is
“B”, “C”, “K”, or “T”, the emission
control system is EM and TWC
(3-way catalyst). The fuel tank/fuel
line emission control system is EVAP (evaporative emissions).
An Emission Control Label is located on the engine. (This is an
EXAMPLE ONLY, information on label varies by engine FAMILY).
Product Emission Durability (Emission Compliance Period)
The 50 or 300 hour emission compliance period is the time span selected by
the manufacturer certifying the engine emissions output meets applicable
emissions regulations, provided that approved maintenance procedures are
followed as listed in the Maintenance Section of this manual.
EMISSION CONTROL INFORMATION
ENGINE FAMILY: XEHXS.0214KO DISPLACEMENT: 21.2 cc
EMISSION COMPLIANCE PERIOD: 300 Hours
THIS ENGINE MEETS U.S.EPA EXH/EVP EMISSION
REGULATIONS FOR MODEL YEAR XXXX REFER TO OWNER'S MANUAL
FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.

PB-7910 H/T DESCRIPTION
X7501201800 15
© 10/23 ECHO Incorporated
DESCRIPTION
PB-7910H
Locate the safety decal(s) or etching(s) on your unit. Make sure they are
legible, and that you understand and follow the instructions. If any cannot be
read, replacements can be ordered from your ECHO dealer. Images shown
below are for example only. Those on your unit might appear slightly
different.
1
3
4
5
7
8
2
6
9
10
11
12
13
14
15

DESCRIPTION PB-7910 H/T
16 X7501201800
© 10/23 ECHO Incorporated
PB-7910H
1. Handle
2. Throttle Position Lever / Stop Switch
3. Air Cleaner
4. Shoulder Harness
5. Safety Decal / Etching
6. Stick Handle
7. Blower Pipes
8. Flexible Pipe
9. Spark Arrester Muffler (with or without Catalyst)
10. Fuel Tank
11. Fuel Tank Cap
12. Spark Plug
13. Choke
14. Recoil Starter Handle
15. Purge Bulb

PB-7910 H/T DESCRIPTION
X7501201800 17
© 10/23 ECHO Incorporated
PB-7910T
Locate the safety decal(s) or etching(s) on your unit. Make sure they are
legible, and that you understand and follow the instructions. If any cannot be
read, replacements can be ordered from your ECHO dealer. Images shown
below are for example only. Those on your unit might appear slightly
different.
1
2
3
4
5
6
7
813
14
15
9
10
11
12

DESCRIPTION PB-7910 H/T
18 X7501201800
© 10/23 ECHO Incorporated
PB-7910T
1. Air Cleaner
2. Shoulder Harness
3. Safety Decal / Etching
4. Handle
5. Throttle Position Lever
6. Throttle Trigger
7. Blower Pipes
8. Flexible Pipe
9. Spark Arrester Muffler (with or without Catalyst)
10. Fuel Tank
11. Fuel Tank Cap
12. Spark Plug
13. Choke
14. Recoil Starter Handle
15. Purge Bulb

PB-7910 H/T CONTENTS
X7501201800 19
© 10/23 ECHO Incorporated
CONTENTS
The ECHO product you purchased has been factory pre-assembled for your
convenience. Due to packaging restrictions, some assembly may be
necessary.
After opening the carton, check for damage. Immediately notify your retailer
or ECHO Dealer of damaged or missing parts. Use the contents list to check
for missing parts.
PB-7910H
PB-7910T
1 Power Head
1FlexPipe
1SwivelPipe
1 Straight Pipe
1EndPipe
1 Quick Start Guide
2 Clamps (with screws)
1 Warranty Statement
1 Stick Handle
1 Cold Weather Insert
1 Power Head
1FlexPipe
1SwivelPipe
1 Straight Pipe
1EndPipe
1 Quick Start Guide
2 Clamps (with screws)
1 Warranty Statement
1 Cold Weather Insert

ASSEMBLY PB-7910 H/T
20 X7501201800
© 10/23 ECHO Incorporated
ASSEMBLY
PB-7910H
Never perform maintenance or assembly procedures with
engine running or serious personal injury may result.
Install Blower Pipes and Stick Handle
1. Assemble clamps (A) onto both
ends of flexible pipe (B).
2. Insert anti-static wire through
flex tube, into swivel pipe.
3. Assemble swivel pipe (C) into
flexible pipe (B).
4. Assemble flexible pipe (B) to
elbow (D) on blower and tighten
clamps (A).
Note: A light lubricant may be
used to ease assembly of
flexible pipe to blower
elbow.
A
B
A
C
C
D
A
AB