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OPERATING INSTRUCTIONS

14

HOLDING THE TRIMMER

WARNING: 

Always wear eye, hearing, foot

and body protection to reduce the risk of
injury when operating this unit.

Before operating the unit, stand in the operating position
(Fig. 17). Check for the following:

The operator is wearing eye protection and proper
clothing.

The right arm is slightly bent, and the hand is holding
the shaft grip.

The left arm is straight, and the hand is holding the
handle.

The unit is below waist level.

The cutting attachment is parallel to the ground and
easily contacts the vegitation to be cut without the
operator having to bend over.

Fig. 17

ADJUSTING TRIMMING LINE LENGTH

The Bump Head™ cutting attachment allows you to
release trimming line without stopping the engine. To
release more line, lightly tap the cutting attachment on
the ground (Fig. 18) while operating the trimmer at high
speed.

NOTE

: Always keep the trimming line fully extended.

Line release becomes more difficult as cutting
line becomes shorter.

Fig. 18

Each time the head is bumped, about 1 in (25.4 mm.) of
trimming line is released. A blade in the cutting attach-
ment shield will cut the line to the proper length if excess
line is released. For best results, tap the Bump Head™
on bare ground or hard soil. If line release is attempted
in tall grass, the engine may stall. Always keep the 
trimming line 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. Excessive line length
will make the clutch overheat. This may lead
to serious personal injury or damage to the
unit.

Some line breakage will occur from:

Entanglement with foreign matter

Normal line fatigue

Attempting to cut thick, stalky weeds

Forcing the line into objects such as walls or fence
posts

TIPS FOR BEST TRIMMING RESULTS

Keep the cutting attachment parallel to the ground.

Do not force the cutting attachment. Allow the tip of
the line to do the cutting, especially along walls.
Cutting with more than the tip will reduce cutting effi-
ciency and may overload the engine.

Cut grass over 8 in. (200 mm.) by working from top
to bottom in small increments to avoid premature
line wear or engine drag.

Cut from left to right whenever possible. Cutting to
the right improves the unit's cutting efficiency.
Clippings are thrown away from the operator.

Slowly move the trimmer into and out of the cutting
area at the desired height. Move either in a forward-
backward or side-to-side motion. Cutting shorter
lengths produces the best results.

Trim only when grass and weeds are dry.

The life of your cutting line is dependent upon;

Following the previous trimming 
techniques

What vegitation is being cut

Where it’s being cut

For example, the line will wear faster when trimming
against a foundation wall as opposed to trimming
around a tree. 

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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