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MAINTENANCE AND REPAIR INSTRUCTIONS

20

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug (or equivalent). The
correct air gap is 0.020 in. (0.5 mm.). Remove the plug
after every 50 hours of operation to check its condition.

1. Stop the engine and allow it to cool. Grasp the plug

wire firmly and pull the cap from the spark plug.

2. Clean dirt from around the spark plug. Remove the

spark plug from the cylinder head by turning a 5/8 in.
socket counterclockwise.

Note:

Replace cracked, fouled or dirty spark plug. 

3. Set the air gap at 0.020 in. (0.5 mm.) using a feeler

gauge (Fig. 34). 

CAUTION:

Do not sand blast, scrape, or

clean electrodes. Grit in the engine could
damage the cylinder.

4. Install a correctly gaped spark plug in the cylinder

head. Tighten by turning the 5/8 in. socket clockwise
until snug. 

If using a torque wrench torque to; 

110-120 in.•lb. (12.3-13.5 N•m). 

Do not over tighten.

ACCESSORIES/REPLACEMENT PARTS

2-Cycle Oil  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147543

Spark Plug  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610311

Replacement Line   . . . . . . . . . . . . . . . . . . . . . . . 610375

Replacement Line Cartridge  . . . . . . . . . . . . . . . 153577

Inner Reel Spring  . . . . . . . . . . . . . . . . . . . . . . . . 610317

Bump Head Knob Assembly  . . . . . . . . . . . . . . . 153066

Outer Spool  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153599

Cutting Attachment Head Assembly  . . . . . . . . . 153700

Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180000

Shoulder Harness  . . . . . . . . . . . . . . . . . . . . . . . 682075

Flail Blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181974

0.020 in.

(0.5 mm.)

Fig. 34

CLEANING AND STORAGE

LONG TERM STORAGE

If the unit will be stored for an extended time,

1. Drain all gasoline from the gas tank into a container .

Do not use gas that has been stored for more than
60 days. Dispose of the old gasoline in accordance
to Federal, State, and Local regulations.

2. Start the engine and allow it to run until it stalls. This

ensures that all gasoline has been drained from the 
carburetor.

3. Allow the engine to cool. Remove the spark plug and

put 1 oz. (30 ml.) of any high quality motor oil into the
cylinder. Pull the starter rope slowly to distribute the
oil. Reinstall the spark plug.

NOTE:

Remove the spark plug and drain all of the oil
from the cylinder before attempting to start the
trimmer after storage.

4. Thoroughly clean the unit and inspect for any loose

or damaged parts. Repair or replace damaged parts
and tighten loose screws, nuts or bolts. The unit is
ready for storage.

TRANSPORTING

Allow the engine to cool before transporting. 

Secure the unit while transporting.

Drain the gas tank before transporting.

Tighten gas cap before transporting.

CLEANING

WARNING:

To avoid serious personal injury,

always turn your trimmer off and allow it to
cool before you clean or do any maintenance
on it.

Use a small brush to clean off the outside of the unit. Do
not use strong detergents. Household cleaners that 
contain aromatic oils such as pine and lemon, and such
as kerosene, can damage plastic housing or handle.
Wipe off any moisture with a soft cloth.

STORAGE

Never store the unit with gasoline in the tank where
fumes may reach an open flame or spark.

Allow the engine to cool before storing.

Store the unit locked up to prevent unauthorized use
or damage.

Store the unit in a dry, well ventilated area.

Store the unit out of the reach of children.

LONG TERM STORAGE

If the unit will be stored for an extended time,

1. Drain all gasoline from the gas tank into a container .

Do not use gas that has been stored for more than
60 days. Dispose of the old gasoline in accordance
to Federal, State, and Local regulations.

Summary of Contents for 768r

Page 1: ...768r Flail Head Trimmer OPERATOR S MANUAL FOR QUESTIONS CALL 1 800 345 8746 in U S or 1 800 265 6778 in CANADA www ryobi com IMPORTANT MANUAL DO NOT THROW AWAY...

Page 2: ...FOR WARRANTY SERVICE Make sure this manual is carefully read and understood before starting or operating this equipment THIS PRODUCT IS COVERED BY ONE OR MORE OF THE US PATENTS LISTED BELOW 5 076 149...

Page 3: ...ith a spark arrestor If it requires replacement ask your LOCAL SERVICE dealer to install the Accessory Part 180030 Spark Arrestor Kit FOR QUESTIONS CALL 1 800 345 8746 IN U S OR 1 800 265 6778 in CANA...

Page 4: ...e area to be cut before each use Remove all objects such as rocks broken glass nails wire or string which can be thrown or become entangled in the cutting attachment Clear the area of children bystand...

Page 5: ...f vegetation and other materials They may become lodged between the cutting attachment and shield To reduce fire hazard replace faulty muffler and spark arrestor keep the engine and muffler free from...

Page 6: ...tions in the operator s manual can result in serious injury Read the operator s manual before starting or operating this unit FOR SERVICE INFORMATION CALL USA 1 800 345 8746 CANADA 1 800 265 6778 WEAR...

Page 7: ...e SHARP BLADE WARNING Sharp blade on cutting attachment shield To prevent serious injury do not touch line cutting blade CHOKE CONTROL A FULL CHOKE position B PARTIAL CHOKE position C RUN position KEE...

Page 8: ...light brush of up to 1 2 inch in diameter RULES FOR SAFE OPERATION 8 Cutting Attachment Shield Gas Cap Throttle Control D Handle Line Cutting Blade Cutting Attachment Handgrip Primer Bulb Choke Lever...

Page 9: ...lder strap Always follow the starting procedures as described in the Operation section 1 Push the strap through the center of the buckle 2 Pull the strap over the cross bar and down through the slot i...

Page 10: ...ng the flail head ASSEMBLY INSTRUCTIONS 10 Hexagon Recess Pin Guides Hexagonal Recess Flail Blades 3 Press the Flail Head Bottom on by matching the pin guides with the Pivot Pins Fig 7 Fig 7 Fig 8 Fig...

Page 11: ...on the ground or on a work bench WARNING The gear housing gets hot with use and can result in injury to the operator When the unit is turned off it remains hot for a short time Do not touch the gear...

Page 12: ...according to the instructions on the container NEVER add fuel additives directly to the unit s fuel tank CAUTION For proper engine operation and maximum reliability pay strict attention to the oil an...

Page 13: ...gine sounds as though it wants to run normally 2 to 5 pulls NOTE Squeeze the throttle control until the engine has started and warmed up 6 Place the choke lever in the PARTIAL choke position B Fig 15...

Page 14: ...e fully extended Line release becomes more difficult as the cutting line becomes shorter NOTE Do not rest the Bump Head on the ground CAUTION Do not remove or alter the line cutting blade assembly Exc...

Page 15: ...e to the unit do not use the flail head assembly for decorative trimming or cutting brush Flail Head Operating Tips To establish a rhythmic cutting procedure Plant feet firmly comfortably apart Bring...

Page 16: ...Part 153066 can be purchased from your local authorized dealer Fig 21 2 Remove the inner reel from the outer spool Fig 22 Fig 23 5 Check the indexing teeth on the innerreel and outer spool for wear Fi...

Page 17: ...ase the line from the holding slots in the spool 7 Hold the inner reel in place and install the Bump Knob by turning clockwise Tighten securely Holding Slots 7 Wind the lines in tight even layers onto...

Page 18: ...oil to lightly coat the filter Fig 31 3 Wash the filter in detergent and water Fig 30 Rinse the filter thoroughly Squeeze out excess water Allow it to dry completely AIR FILTER MAINTENANCE Removing th...

Page 19: ...of the air filter before adjusting the idle speed screw Refer to Air Filter Maintenance Pg 18 5 Squeeze the filter to spread and remove excess oil Fig 32 Adjust Idle Speed Screw WARNING The cutting a...

Page 20: ...it to run until it stalls This ensures that all gasoline has been drained from the carburetor 3 Allow the engine to cool Remove the spark plug and put 1 oz 30 ml of any high quality motor oil into th...

Page 21: ...s tank Fill fuel tank Primer bulb wasn t pressed enough Press primer bulb fully and slowly 5 7 times Engine flooded Use starting procedure with choke lever in the RUN position Pg 13 Old or improperly...

Page 22: ...Starter Auto Rewind Muffler Baffled with Guard Throttle Manual Spring Return Fuel Tank Capacity 18 oz 530 ml Fuel Tank HD Polyethylene Drive Shaft Housing Steel Tube Throttle Control Finger Tip Trigge...

Page 23: ...800 345 8746 MANUFACTURER S WARRANTY COVERAGE The warranty period begins on the date the engine or equipment is delivered to the retail purchaser The manufacturer warrants to the initial owner and eac...

Page 24: ...al or workmanship will be repaired or replaced by an authorized RYOBI service dealer without charge for parts and labor The RYOBI Product including any defective part must be returned to an authorized...

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