ECHO PB-7910 H T Power Blower User Manual

ECHO PB-7910 H T Power Blower

Product Information

to the State of California to cause cancer, birth defects, or other
reproductive harm.
Compliance| This product complies with CAN ICES-2/NMB-2.

Product Usage Instructions

Before Use
Read and understand all provided literature. The literature contains specifications and information for safety, operation, maintenance, storage, and assembly specific to this product. Scan QR codes for more information.

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 need to buy parts, always have the model number and serial number of the unit with you. For future reference, write them down in the space provided below:

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). Proof of purchase is required for warranty service/repairs.

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. Please have the model and serial number of your unit ready before calling.

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 they need to contact you.

Additional Literature
In addition to finding information online, you can also get information from your Authorized ECHO Service Dealer or by contacting ECHO Incorporated at 400 Oakwood Road, Lake Zurich, IL 60047, 1-800-432-ECHO (3246).

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.

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).

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 keywords. The following is an explanation of those symbols and keywords and what they mean to you.

DANGER
The safety alert symbol accompanied by the word “DANGER” calls attention to an act or condition that WILL lead to serious personal injury or death if not avoided.
WARNING
The safety alert symbol accompanied by the word “WARNING” calls attention to an act or condition that CAN lead to serious personal injury or death if not avoided.
CAUTION
The safety alert symbol accompanied by the word “CAUTION” calls attention to an act or condition that might lead to minor or moderate personal injury if not avoided.

NOTE

The enclosed message provides information necessary for the protection of the unit.
Note: This enclosed message provides tips for the 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.

International Symbols

Note: Not all symbols will appear on your unit.

Personal Condition and Safety Equipment

WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov.
WARNING: The muffler or catalytic muffler and surrounding cover may become extremely hot. Always keep clear of the exhaust and muffler areas, otherwise serious personal injury might occur.

WARNING:

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
WARNING

• 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.

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.

WARNING
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

CAUTION
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.

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.

DANGER
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.
DANGER
Do not operate this product indoors or in inadequately ventilated areas. Engine exhaust contains poisonous emissions and can cause serious injury or death.

• 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.

Equipment

WARNING

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

WARNING

• 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.

WARNING
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

EMISSION CONTROL (EXHAUST & EVAPORATIVE)

CARB and 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 (sample below) 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). Evaporative emissions for California models are only applicable to fuel tanks and fuel feed lines. 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.

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. 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-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. 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

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

• 1 Power Head
• 1 Flex Pipe
• 1 Swivel Pipe
• 1 Straight Pipe
• 1 End Pipe
• 1 Quick Start Guide
• 2 Clamps (with screws)
• 1 Warranty Statement
• 1 Stick Handle
• 1 Cold Weather Insert

PB-7910T

• 1 Power Head
• 1 Flex Pipe
• 1 Swivel Pipe
• 1 Straight Pipe
• 1 End Pipe
• 1 Quick Start Guide
• 2 Clamps (with screws)
• 1 Warranty Statement
• 1 Cold Weather Insert

ASSEMBLY

WARNING
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.
5. Loosen knob (E) completely and expand the stick handle clamp. Align wire (G) in the handle with the grounding strip on the swivel pipe (C).
6. Slide stick handles onto swivel pipe (C). The stick handle (F) should be angled away from the operator.
7. Position stick handle (F) for comfortable operation. Tighten knob (E).
8. Assemble straight pipe (J) onto swivel pipe (C), until you feel light resistance. Hold the swivel pipe and turn the straight pipe clockwise, engaging positive-locking channels, until the connection is firm. Do not force the connection.
9. Assemble end pipe (K) to straight pipe (J) the same as in step 8.
   • Note: Blower use will eventually loosen pipe connections. Exclusive positive locking system allows pipes to be tightened. If loosening occurs, remove two pipes and install according to steps 8 and 9.

WARNING
Never perform maintenance or assembly procedures with engine running or serious personal injury may result.

Install Blower Pipes

1. Assemble clamps (A) and (G) onto both ends of flexible pipe (B).
   • Note: Clamp with cable guide loop (G) fits elbow end of flexible pipe.
2. Insert anti-static wire through flex tube.
   • Note: A light lubricant may be used to ease assembly of flexible pipe to blower elbow.
3. Assemble flexible pipe to elbow (D) on blower. Position clamp with cable guide loop (G) on outside of flexible pipe and tighten clamp.
   • Note: Hang handle freely from blower to assure throttle cable is not twisted before installing handle (E).
4. Position throttle cable along the outside of elbow. Loosen knob (H) on handle (E). Install onto swivel pipe (C).
5. Insert anti-static wire into swivel pipe.
6. Assemble swivel pipe into flexible pipe and tighten clamp (A).
7. Clip throttle cable into throttle cable guide loop.
8. Move handle (E) to desired position. Tighten knob (H).
9. Assemble straight pipe (J) onto swivel pipe, until you feel light resistance. Hold swivel pipe and turn straight pipe clockwise, engaging positive locking channels, until connection is firm. Do not force connection.
10. Assemble end pipe (K) to straight pipe as in step 9.
    • Note: Blower use will eventually loosen pipe connections. Exclusive positive locking system allows pipes to be tightened. If loosening occurs, remove two straight pipes and install according to steps 9 and 10.

OPERATION

WARNING: 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. Blower housing might contain shredder blades and other sharp edges that can cause serious injuries if touched, even if engine is off and blades are not moving. Wear gloves to protect hands from sharp edges and hot surfaces.
WARNING: Operation of this equipment might create sparks that can start fires around dry vegetation. This unit is equipped with a spark arrester to prevent discharge of hot particles from the engine. Contact local fire authorities for laws or regulations regarding fire prevention requirements.
WARNING: Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause unconsciousness, serious injury, or death. Exhaust can cause serious burns. ALWAYS position unit so that exhaust is directed away from your face and body.

WARNING

• This blower should be used for clearing leaves, grass, debris, and dust in yards, gardens, driveways, and parking lots only.
• Always maintain a direct, clear line of sight to the unit and the work being performed.
• Always be alert for changes in the operation of the unit.
• Always shut the engine off before transporting the unit to a new location.
• Always secure the unit during transportation to prevent turnover, fuel spillage, and damage to the unit.

Fuel

WARNING: Diesel fuels and alternative fuels, such as E-15 (15% ethanol), E-85 (85% ethanol) or any fuels not meeting ECHO requirements are NOT approved for use in ECHO 2-stroke gasoline engines. Use of diesel or alternative fuels can cause performance problems, loss of power, overheating, fuel vapor lock, and unintended machine operation, including, but not limited to, improper clutch engagement. Diesel or alternative fuels can also cause premature deterioration of fuel lines, gaskets, carburetors and other engine components.

Fuel Requirements

• Gasoline – Use fresh (purchased within the last 30 days from the pump) 89 Octane [R+M/2] (mid-grade or higher) gasoline known to be good quality. Gasoline may contain up to 10% Ethanol (grain alcohol) or 15% MTBE (methyl tertiary-butyl ether). Gasoline containing methanol (wood alcohol) is NOT approved. Use of ECHO-branded fuel is recommended to extend engine life in all air-cooled 2-stroke and 2/4-stroke hybrid engines.
• Two Stroke Oil – A two-stroke engine oil, such as ECHO branded 2-stroke oils, meeting ISO-L-EGD (ISO/CD 13738) and J.A.S.O. FD Standards must be used. ECHO-branded 2-stroke oils meet these standards. Engine problems due to inadequate lubrication caused by failure to use an ISO-LEGD (ISO/CD 13738) and J.A.S.O. M345-FD certified oil will void the two-stroke engine warranty.

2-Stroke engine oil contains petroleum distillates and other additives that may be harmful if swallowed. Heated oil can release vapors that can cause flash fire, or ignite with explosive force. Read and follow the oil manufacturer’s instructions, and observe all safety warnings and precautions for handling flammable liquids. For more detailed safety and first aid information, visit www.echo-usa.com. for a copy of the Material Safety Data Sheet.

• KEEP OUT OF REACH OF CHILDREN.
• If swallowed, do not induce vomiting. CALL PHYSICIAN OR A POISON CONTROL CENTER IMMEDIATELY.
• WEAR SAFETY GLASSES when mixing or handling.
• AVOID repeated or prolonged skin contact.
• AVOID inhaling oil mists or vapors.

NOTICE
ECHO-branded 2-stroke oils may be mixed at a 50:1 ratio for application in all ECHO engines sold in the past regardless of the ratio Specified in those manuals.

Handling Fuel

WARNING: Fuel is VERY flammable. Use extreme care when mixing, storing, or handling, or serious personal injury will result.

• Use an approved fuel container. Mark fuel containers as containing a 2-stroke mixture of fuel.
• DO NOT smoke near fuel.
• DO NOT allow flames or sparks near fuel.
• Fuel tanks/cans may be under pressure. Always loosen fuel caps slowly allowing pressure to equalize.
• NEVER refuel a unit when the engine is HOT or RUNNING!
• DO NOT fill fuel tanks indoors. ALWAYS fill fuel tanks outdoors over bare ground.
• DO NOT overfill the fuel tank. Wipe up spills immediately.
• Securely tighten the fuel tank cap and close the fuel container after refueling.
• Inspect for fuel leakage. If fuel leakage is found, do not start or operate the unit until the leakage is repaired.
• Move at least 3 m (10 ft.) from the refueling location before starting the engine.

DANGER: Gasoline vapor is heavier than air, and can travel along the ground to nearby sources of ignition such as electrical motors, pilot lights, and hot or running engines. Vapors ignited by an ignition source can flash back to the fuel container, resulting in an explosion, fire, serious or fatal injuries, and extensive property damage.

Mixing Instructions

NOTICE: Stored fuel ages. Do not mix more fuel than you expect to use in 30 days or 90 days when a fuel stabilizer is added.

1. Fill an approved fuel container with half of the required amount of gasoline.
2. Add the proper amount of 2-stroke oil to gasoline.
3. Close the container and shake to mix oil with gasoline.
4. Add the remaining gasoline, close the fuel container, and remix.

Fuel to Oil Mix – 50:1 Ratio

US| Metric
Gas| Oil| Gas| Oil
gal.| fl.oz.| L| cc
1| 2.6| 5| 100
2| 5.2| 10| 200
5| 13| 25| 500

NOTICE: Spilled fuel is a leading cause of hydrocarbon emissions. Some locations may require the use of automatic fuel shut-off containers treduce fuel spillage. Storage – Fuel storage laws vary by locality. Contact your local government for the laws affecting your area. As a precaution, store fuel in an approved, airtight container. Store in a well-ventilated, unoccupied building, away from sparks and flames.

• Empty the fuel tank prior to storing the unit. Return unused fuel to an approved fuel storage container.

NOTICE: Stored two-stroke fuel can separate. ALWAYS shake fuel container thoroughly before each use.

NOTICE: Used oil and gasoline, and soiled towels are hazardous waste materials. Disposal laws vary by locality.

Starting Cold Engine

PB-7910H only: Rotate spring loaded throttle arm downward to a comfortable operating position.
PB-7910 H/T: Recoil starter: Use short pulls – only 1/2- 2/3 of rope length for starting. Do not allow the rope to snap back in. Always hold the unit firmly.

1. Throttle Lever Move throttle lever (A) to IDLE position.
2. Choke Rotate choke (B) to COLD START position.
3. Purge Bulb Pump purge bulb (C) until fuel is visible. Pump bulb an additional 4 or 5 times.
4. Recoil Starter Pull recoil starter handle (D) until engine fires, or a maximum of 5 pulls.
5. If engine fires and remains running, pull throttle trigger (T model) or advance throttle lever (H model) to automatically return choke to run position, then proceed to engine warm up. If engine fires and dies, proceed to step 6.
6. Choke After engine fires (or 5 pulls), move choke lever back to RUN position, then pull starter handle/ rope until engine starts and runs. Allow unit to warm up at idle for several minutes.
   • Note: If engine does not start with choke in “RUN” position after 5 pulls, move choke to COLD START position, and repeat steps 3- 6.
   • NOTICE: Allow engine to warm up for several minutes before use.
7. Throttle Lever After engine warm-up, move throttle lever gradually to increase engine RPM to desired operating speed.

Starting Warm Engine

The starting procedure is the same as Cold Start except DO NOT close the choke.

1. Throttle LeverMove throttle lever (A) to IDLE position.
2. Purge Bulb Pump purge bulb (C) until fuel is visible. Pump bulb an additional 4 or 5 times.
3. Recoil Starter Pull recoil starter handle (D) and engine should start. Do not use choke (B).
   • Note: If engine does not start after 5 pulls, use cold start procedures.

Stopping Engine PB-7910H

1. Throttle Lever Move throttle lever (A) to IDLE position and allow engine to return to idle before shutting off engine.
2. Throttle Lever Move throttle lever (A) to (STOP) position.

PB-7910T

1. Throttle Lever Release throttle trigger. Move Throttle Lever (A) forward to idle position and allow engine to return to idle before shutting off engine.
2. Throttle Lever Move Throttle Lever (A) all the way forward to STOP position.

WARNING: If engine does not stop when stop switch is moved to STOP position, close choke – COLD START position – to stall engine. Have your dealer repair stop switch before using unit again.

Operating Blower

WARNING: Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause unconsciousness, serious injury, or death. Exhaust can cause serious burns. ALWAYS position unit so that exhaust is directed away from your face and body.
WARNING: Always wear safety glasses, hearing protection and a face filter mask or serious personal injury may result. Do not point the blower pipe in the direction of people or pets.
NOTICE: Use reduced speed only when performing light-duty tasks or to comply with local noise regulations. Continuous low speed operation may allow fuel/oil residue to build-up on the piston and cause rapid build-up of carbon on the spark arrester screen, resulting in overheating and engine damage. To reduce harmful build-up, run engine at wide open throttle for at least 5 minutes every hour, and inspect/clean the spark arrester screen after approximately 40 hours of operation. Read the Safety Section carefully.
NOTICE:

To avoid engine damage due to over-revving, do not block blower pipe.

1. Use only during appropriate hours. Contact your local government for the ordinances affecting your area.
2. To reduce sound levels, limit the number of pieces of equipment used at any one time.
3. Allow the engine to warm up at a fast idle for a few minutes.
4. PB-7910H Set engine speed with throttle position lever (A). PB-7910T Control engine speed with throttle trigger (B), or for continuous use, set engine speed with throttle position lever (A).
5. Use lower speed to blow dry leaves from walks, patios and drives. Use rakes and brooms to loosen debris before blowing.
6. Additional speed may be necessary to clean grass and leaves from a lawn or flower bed.
7. Higher speed may be necessary to move gravel, dirt, snow, bottles or cans from a driveway, street, parking lot or stadium.
8. Always stop unit using stop engine procedure.
   • Note: Never use a higher speed setting than necessary to perform a task. Remember, the higher the engine speed, the louder the blower noise.

MAINTENANCE

For Operator Comfort in Cold Weather Operation:

WARNING: This product should not be used in temperatures below 15° F (-9° C) otherwise damage to the fuel lines may occur.

1. Install cold weather insert (B) on frame over air intake.
   • Note: Blower performance may be reduced slightly.

WARNING: Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing, and loose objects away from all openings. Always stop the engine, disconnect the spark plug, and make sure all moving parts have come to a complete stop before removing obstructions, clearing debris, or servicing the unit. Allow the unit to cool before performing service. Wear gloves to protect hands from sharp edges and hot surfaces
WARNING: Operating a poorly maintained unit can result in serious injuries to the operator or bystanders. Always follow all maintenance instructions as written, otherwise, serious personal injury can result. Your unit is designed to provide many hours of trouble-free service. Regularly scheduled maintenance will help your unit achieve that goal. If you are unsure or are not equipped with the necessary tools, we recommend that you take your unit to a Servicing Dealer for maintenance. To help you decide whether you want to DO IT YOURSELF or have the Dealer do it, each maintenance task has been graded. If the task is not listed, see your Dealer for repairs.

NOTICE: The use of emission control components other than those specifically designed for this unit is a violation of federal law.

Skill Levels

• Level 1 = Easy to do. Common tools may be required.
• Level 2 = Moderate difficulty. Some specialized tools may be required.
• Level 3 = See your dealer.
• Click HERE or go to http://www.echo-usa.com/products/maintenance-kit. or HERE https://www.shindaiwa-usa.com/you-can.aspx.

Maintenance Intervals

Daily or Before Use
Air Filter| Inspect/Clean 1| ****

1

Choke Shutter
Fuel System| Inspect
Cooling System| Inspect/Clean| 2
Recoil Starter Rope| Inspect/Clean 1| 1
Screws/Nuts/Bolts| Inspect/Tighten/Replace 1
Every Refuel
Fuel System| Inspect 1| 1
Cooling System| Inspect/Clean| 2
COMPONENT/SYSTEM| MAINTENANCE PROCEDURE| SKILL LEVEL
---|---|---
3 Months
Air Filter| Replace 1| ****

1

Fuel Filter| Inspect 1
Fuel Cap Gasket
Spark Plug| Inspect/Clean/Replace 1
Muffler Spark Arrester| 2
Cylinder Exhaust Port| Inspect/Clean/De-carbon
Yearly
Fuel Filter| Inspect/Replace1| 1
Fuel Cap Gasket| Replace 1

IMPORTANT NOTE – Time intervals shown are maximum. Actual use and your experience will determine the frequency of required maintenance.
MAINTENANCE PROCEDURE NOTES: 1 Replacement is recommended based on the finding of damage or wear during inspection.

Air Filter
Level 1.
Parts required: Tune-Up Kit.

1. Close choke (COLD START position). This prevents dirt from entering the carburetor’s throat when the air filter is removed. Brush accumulated dirt from air cleaner area.

2. Remove air filter cover, foam pre-filter, and air filter. Brush dirt from the inside cover.
   Foam Pre-Filter:

   • Clean foam pre-filter (A) in water/detergent solution and rinse with clean water.

   • Wrap the foam pre-filter in a clean, dry cloth and squeeze (do not wring) dry. Allow to dry completely before reuse. Do not oil.
     Air Filter:

   • Lightly brush debris from the air filter (B).

   • Replace the filter if it is damaged, very dirty, or the rubber sealing edges are deformed.

   • If the filter can be reused, be certain it fits tightly in the air filter cavity and is installed with the original side out.

3. Assemble components in reverse order.

Fuel Filter Level 1.
Parts required: Tune-Up Kit.

DNAGER: Fuel is VERY flammable. Use extreme care when mixing, storing or handling, or serious personal injury can result.

1. Use a clean rag to remove loose dirt from around fuel cap and empty fuel tank.
2. Pull the fuel filter from the tank.
   • NOTICE: Do not damage fuel line while removing fuel filter from tank.
3. Remove the filter from the line and install the new filter.
   • Note: Federal EPA regulations require all model year 2012 and later gasoline powered engines produced for sale in the United States to be equipped with a special low permeation fuel supply hose between the carburetor and fuel tank. When servicing model year 2012 and later equipment, only fuel supply hoses certified by EPA can be used to replace the original equipment supply hose. Fines up to $37,500 may be enforced for using an un-certified replacement part.

Spark Plug Level 2.
Parts required: Tune-Up Kit

NOTICE: Use only NGK CMR7H spark plug otherwise severe engine damage can occur.

1. Remove spark plug and check for fouling, worn and rounded center electrode.
2. Clean the plug or replace with a new one. DO NOT sand blast to clean. Remaining sand will damage engine.
3. Adjust spark plug gap by bending outer electrode.
4. Tighten spark plug to 102-153 kgf•cm (86-133 lbf•in).

Cooling System Level 2.

NOTICE: To maintain proper engine  operating temperatures, coolingair must pass freely through the cylinder fin area. This flow of air carries combustion heat away from the engine.

Overheating and engine seizure can occur when:

• Air intakes are blocked, preventing cooling air from reaching the cylinder.
• Dust and grass build up on the outside of the cylinder. This build up insulates the engine and prevents the heat from leaving. Removal of cooling passage blockages or cleaning of cooling fins is considered “Normal Maintenance.” Any failure attributed to lack of maintenance is not warranted.

Clear Debris

1. Brush accumulated debris from intake grill and other cooling passages.

Cleaning Cylinder Fins

1. Disconnect the spark plug lead from the spark plug.
2. Remove the engine cover.
3. Clean cylinder fins (A) to allow cooling air to pass freely.
4. Install engine cover.
5. Connect spark plug lead.

Exhaust System

Spark Arrester Screen Level 2.
Parts required: Spark Arrester Screen

NOTICE: Carbon deposits in muffler will cause a drop in engine output and overheating. Spark arrester screen must be checked periodically.

1. Disconnect spark plug lead from spark plug.
2. Remove engine cover.
3. Remove spark arrester screen (C) from muffler. Replace screen if plugged with carbon deposits.
   • Note: When cleaning carbon deposits, be careful not to damage the catalytic element inside muffler.
4. Install spark arrester screen.
5. Install engine cover.
6. Connect spark plug lead.

Exhaust Port Cleaning Level 2.
Parts required: Muffler Gasket (as required).

1. Remove spark plug lead from spark plug, and remove engine cover.
2. Place piston at top dead center. Remove muffler (A) and muffler gaskets (B).
3. Use a wood or plastic scraping tool to clean deposits from cylinder exhaust port.
   • NOTICE: Never use a metal tool to scrape carbon from the exhaust port. Do not scratch the cylinder or piston when cleaning the exhaust port. Do not allow carbon particles to enter the cylinder.
4. Inspect the muffler gasket, and replace it if damaged.
5. Install muffler gasket and muffler.
6. Tighten muffler mounting bolts (or nuts) to 110-150 kgf•cm (95-130 lbf•in).
7. Install the engine cover and attach the spark plug lead.
8. Start the engine, and warm it to operating temperature.
9. Stop the engine, and re-tighten mounting bolts (or nuts) to specifications.

Carburetor Adjustment

Engine Break-In
New engines must be operated for a minimum duration of two tanks of fuel break-in before carburetor adjustments can be made. During the break-in period, your engine performance will increase and exhaust emissions will stabilize. Idle speed can be adjusted as required.
High Altitude Operation
This engine has been factory-adjusted to maintain satisfactory starting, emission, and durability performance up to 335 m (1,100 ft.) above sea level. To maintain proper engine operation and emission compliance above 335 m (1,100 ft.) ASL the carburetor may need to be adjusted by an authorized service dealer.

NOTICE: If the engine is adjusted for operation above 335 m (1,100 ft.) above sea level, the carburetor must be re-adjusted when operating the engine below 335 m (1,100 ft.) above sea level, otherwise severe engine damage may result.

Level 2. Parts required: None.

Note: Every unit is run at the factory and the carburetor is set in compliance with emission regulations. Carburetor adjustments, other than idle speed, must be performed by an authorized dealer.

Idle Adjustment
Before adjustment make sure that:

• Air filter is clean and properly installed.
• Spark arrester screen and muffler are free of carbon.
• Blower pipes are installed.

1. Start engine, run at idle for one minute.
2. Complete warm up by running at full throttle for 5 minutes, operating choke twice to clear air from carburetor chambers.
3. Check idle speed and reset if necessary. If a tachometer is available, idle speed screw (A) should be set to the specifications found on “Specifications” Page of this  manual. Turn idle screw (A)clockwise to increase idle speed; counterclockwise to decrease idle speed.

Throttle Cable Adjustment (PB-7910T only)
Level 1
If engine idle speed changes when blower pipe is moved, or engine will not reach full wide open throttle speed, adjust throttle cable.

1. Loosen handle adjustment knob (C) and tilt tube throttle handle forward to expose adjustment screw (D).
2. Turn adjustment screw until throttle trigger free play is 4 – 6 mm (3/16-1/4 in.).
3. After adjustment, squeeze and release throttle trigger several times to verify carburetor throttle shaft has full range of movement from idle to wide open throttle positions.

TROUBLESHOOTING

DANGER: Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition spark by grounding the spark plug near the cylinder plug hole, otherwise serious personal injury may result.

ENGINE PROBLEM TROUBLESHOOTING CHART

Problem| Check| Status| Cause| Remedy
 | Fuel at carburetor| No fuel at carburetor| Fuel strainer or fuel line obstructed| Clean or replace

See your dealer

Engine starts hard or Engine does not start| __

__

__

Fuel at cylinder

| No fuel at cylinder| Carburetor| See your dealer
__

__

Muffler wet with fuel

| __

__

Fuel mixture too rich

| OPEN choke

Clean or replace air filter

Adjust carburetor

 |  |  |  | See your dealer
__

__

__

Engine starts hard or Engine does not start

| __

Spark at end of plug wire

| __

__

__

__

__

No spark

| Ignition at STOP position

__

Electrical problem

__

Interlock switch

| Move ignition away from STOP position.

See your dealer

__

Spark at plug

| Incorrect gap –

Covered with carbon – Fouled with fuel – Plug defective

| Adjust to

0.65 mm (0.026 in.)

Clean or replace plug

ENGINE PROBLEM TROUBLESHOOTING CHART

Problem| Check| Status| Cause| Remedy

Engine runs, but dies

or

Engine does not acceler- ate properly

| Air filter| Air filter dirty| Normal wear| Clean or replace

Fuel filter

| Fuel filter dirty| Contaminants or residue in fuel| Replace filter or replace fuel
Fuel vent| Fuel vent plugged| Contaminated fuel| Clean or replace
Spark plug| Plug dirty or worn| Normal wear| Clean and adjust or replace
Carburetor| Improper adjustment| Vibration| Adjust
Cooling system| Cooling system dirty or plugged| Extended oper- ation in dirty or dusty locations| ****

Clean

Spark arrester screen| Spark arrester screen plugged| ****

Normal wear

| ****

Replace

Engine does not crank| ****

N/A

| Internal engine problem| ****

See your dealer

STORAGE

DANGER: During operation the muffler or catalytic muffler and surrounding cover become hot. Always keep the exhaust area clear of flammable debris during transportation or when storing, otherwise serious property damage or personal injury may result.

Long Term Storage (Over 30 Days)

DANGER: Do not store in the enclosure where fuel fumes may accumulate or reach an open flame or spark. Do not store your unit for a prolonged period of time (30 days or longer) without performing protective storage maintenance which includes the following:

1. Store the unit in a dry, dust-free place, out of the reach of children.
2. Place the stop switch or lever in the “OFF” position.
3. Remove accumulation of grease, oil, dirt, and debris from the exterior of the unit.
4. Perform all periodic lubrication and services that are required.
5. Tighten all the screws and nuts.
6. Drain the fuel tank completely. Press the purge bulb 6 -7 times to remove the remaining fuel from the carburetor then drain the tank again. Close choke, start and run the engine until it stops due to lack of fuel.
7. Allow the engine to cool. Remove the spark plug lead from the spark plug. Remove the spark plug. Pour 7 cc (0.25 oz.) of fresh, clean, two-stroke engine oil into the cylinder through the spark plug hole.
8. Pull the recoil starter handle 2-3 times to distribute the oil inside the engine.
9. Observe the piston location through the spark plug hole. Pull the recoil handle slowly until the piston reaches the top of its travel and leave it there.
10. Install the spark plug. Connect the spark plug lead to the spark plug.
11. Remove the blower pipe assembly from the unit.

SPECIFICATIONS

Gasoline

| Use 89 Octane unleaded. Do not use fuel containing methyl alcohol, more than 10% ethyl alcohol or 15% MTBE. Do not use alternative fuels such as E-15 or E-85.
Oil| ISO-L-EGD (ISO/CD 13738) and J.A.S.O. M345-

FD, two-stroke, air-cooled engine oil.

Fuel Tank Capacity| 1.98 L (67.0 US fl. oz.)
Starter System| Automatic recoil starter, centrifugal type
Idle Speed| 2,500 RPM
Wide Open Throttle Speed| 7,600 RPM
Air Force| 40 N
Maximum Air Speed (with pipes)| 107.3 m/sec (240 mph)
Air Volume| 24 m3/min. (835 ft.3/min.)
Sound Level at 15.25 m

(50 ft.) dB(A) scale per ANSI B175.2

| ****

76 dB(A)

PRODUCT REGISTRATION

Thank you for choosing ECHO Power Equipment

• Please go to http://www.echo-usa.com/Warranty/Register-Your-ECHO. to register your new product online. It’s FAST and EASY! NOTE: your information will never be sold or misused by ECHO, Incorporated.
• Registering your purchase enables us to contact you in the unlikely event of a service update or product recall, and verifies your ownership for warranty consideration.
• If you do not have access to the Internet, you can complete the form below and mail it to:
• ECHO Incorporated, Product Registration, PO Box 1139, Lake Zurich, IL 60047.

PRODUCT REGISTRATION CARD

WARNING: The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
WARNING: 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.

CONTACT

• ECHO INCORPORATED
• 400 Oakwood Road
• Lake Zurich, IL 60047
• www.echo-usa.com.
• P56315001001 – P56315999999
• P56415001001 – P56415999999

© 07/23 ECHO Incorporated

References

• P65warnings.ca.gov
• Outdoor Power Equipment & Tools | ECHO
• Outdoor Power Equipment & Tools | ECHO
• P65Warnings.ca.gov
• Shindaiwa Tech Support | Dealer Locator, FAQs, Customer Service, Parts Lookup, Technical Documents | Shindaiwa-USA.com
• Shindaiwa Tech Support | Dealer Locator, FAQs, Customer Service, Parts Lookup, Technical Documents | Shindaiwa-USA.com

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