Homelite UT74121A BAR and Chain Combinations, Troubleshooting, Problem Possible Cause Solution

Page 36

BAR AND CHAIN COMBINATIONS

 

Length of Bar

Guide Bar Part Number

Chain Part Number

 

305 mm (12 in.)

UP08695

UP08692

 

356 mm (14 in.)

UP08696

UP08693

 

406 mm (16 in.)

UP08698

UP08694

 

 

 

 

 

 

TROUBLESHOOTING

 

 

 

 

 

 

 

 

 

 

PROBLEM

POSSIBLE CAUSE

SOLUTION

Engine will not start. (Make sure ignition switch is in start position “I”.)

1.No spark.

2.Flooded engine.

1.Check spark. Remove air filter cover. Remove sparking plug from cylinder. Reattach the sparking plug wire and lay sparking plug on top of cylinder with the metal part of plug touching the cylinder. Pull the starter rope and watch for spark at sparking plug tip. If there is no spark, repeat test with a new sparking plug.

2.With the ignition switch off, remove sparking plug. Move choke lever to run position (pushed in com- pletely) and pull starter cord 15 to 20 times. This will clear excess fuel from engine. Clean and reinstall sparking plug. Set ignition switch to run (I) position. Push and fully release primer bulb 7 times. Pull starter three times with choke lever at run. If engine does not start, move choke lever to choke and repeat normal starting procedure. If engine still fails to start, repeat procedure with a new sparking plug.

Engine starts but will not

Carburettor requires “L” (Low jet)

Contact a Homelite service dealer for carburettor

accelerate properly.

adjustment.

adjustment.

 

 

 

Engine starts but will not

Carburettor requires “H” (High jet)

Contact a Homelite service dealer for carburettor

run properly at high

adjustment.

adjustment.

speed.

 

 

 

 

 

 

 

 

 

Engine does not reach

1.

Check oil fuel mixture.

1.

Use fresh fuel and the correct 2-cycle oil mix ratio.

full speed and/or emits

2.

Air filter dirty.

2.

Clean air filter. Refer to “Maintenance – Cleaning the

excessive smoke.

 

 

 

Air Filter” earlier in this manual.

 

3.

Spark arrester screen dirty.

3.

Clean spark arrester screen. Refer to “Maintenance

 

 

 

 

– Cleaning the Spark Arresting Silencer” earlier in

 

4.

Carburettor requires “H” (High

 

this manual.

 

 

jet) adjustment.

4.

Contact a Homelite service dealer for carburettor

 

 

 

 

adjustment.

 

 

 

 

 

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Contents OPERATOR’S Manual Save this Manual for Future ReferenceTable of Contents IntroductionGeneral Safety Rules Read ALL InstructionsDo not Operate a Chainsaw That is Damaged Specific Safety Rules General PrecautionsSafety Apparel Basic Precautions in the CUTTING/ Work AreaMaintenance Precautions Push and PullKICK-BACK Pull PushSymbols Symbol Name ExplanationRUN StopSpecifications Features Understanding Your Chainsaw Safety Devices OperationLOW KICK-BACK SAW Chain Guide BarsKICK-BACK Precautions Chain BrakeRUN Position KICK-BACK Brake Position RotationalFuel and Refuelling Handling the Fuel SafelyMixing the Fuel Filling the TankBrake Position Ignition Switch RUN Primer Bulb Chain OIL SystemStarting the Engine See Figures 10 toStarting a Cold Engine Stopping the Engine Starting a Warm EnginePreparing for Cutting Proper Grip on HandlesChain Line Proper GripBasic OPERATING/CUTTING Procedures Work Area PrecautionsAdjusting the Carburettor See Figures 24Adjusting Idling Speed Operating the Chain BrakeBrake Position RUN Position Felling Trees Hazardous Conditions Retreat PathProper Procedure for Tree Felling Planned Line of FallRetreat Hinge Notch Approx /3 Diameter Trunk Back CUTHinge Back CUT WedgeRemoving Buttress Roots BuckingBucking with a Wedge Vertical CUT Loose Section Horizontal KICK-BACK WedgeBucking Logs Under Stress OverbuckingUnderbucking LOG Supported AT ONE END Finishing CUTLimbing and Pruning Cutting Spring PolesLoad Second CUT Finishing CUT Spring PoleMaintenance Assembling the BAR and ChainCutters Chain Tensioning Screw Adjusting the Chain Tension Chain MaintenanceSee Figures 52, 53 Flats on Drive LinksSharpening the Cutters Check for Wear or Damage LEFT-HAND Cutters RIGHT-HAND Maintaining Depth Gauge Clearance TOP Plate Filing AngleSide Plate Angle Restore Original Shape by Rounding Front Maintaining the Guide BARMaintaining the SAFE-T-TIP Nose Guard Lubricating HoleCleaning the AIR Filter Mounting the SAFE-T-TIP Nose GuardTighten 3/4 Turn See Figures 71, 72Cleaning the Starter Unit Cleaning the EngineChecking the Fuel Filter Replacing the Sparking PlugCleaning the Spark Arresting SI- Lencer Chain Catcher Brake Band Clean the Chain BrakeChain Brake Storing the Chainsaw 1 Month or LongerTroubleshooting Problem Possible Cause SolutionBAR and Chain Combinations Tions. See Figure But chain is not rotatingWarranty Safety DirectiveGuarantee Statement Rtsa / Rtuk / RTG EC Declaration of ConformityPage Ryobi Technologies GmbH

UT74121A specifications

The Homelite UT74121A is a versatile gas-powered string trimmer designed for homeowners and landscapers seeking an efficient tool for maintaining their lawns and gardens. Known for its reliability, the UT74121A combines performance with user-friendly features that make lawn care tasks less daunting.

One of the standout features of the UT74121A is its powerful 26cc 2-cycle engine. This engine provides ample power for cutting through dense grass and weeds, ensuring that tasks are completed quickly and efficiently. The lightweight design of the trimmer, coupled with its ergonomic handle, allows users to maneuver easily, making it ideal for extended use without causing fatigue.

The Homelite UT74121A is equipped with an easy-to-load bump feed spool for quick line replacement. Users can effortlessly advance the cutting line by tapping the trimmer's head on the ground, making it convenient to maintain the desired cutting length without interrupting work. The trimmer uses .095-inch diameter line, which provides durability and resilience against tough conditions.

In terms of design, the UT74121A features a straight shaft that offers increased reach and allows users to access hard-to-reach areas with ease. This design is particularly helpful for trimming along fences, in flower beds, and under low-hanging branches. The adjustable handle height further enhances user comfort, allowing for customization based on individual preferences.

Safety is a primary concern for any outdoor equipment, and the UT74121A incorporates several features to enhance user safety. It comes with a protective shield that prevents debris from being thrown during operation, and the easy-starting system reduces pull effort, making it accessible for users of all skill levels.

The trimmer also adheres to stringent emissions standards, making it an environmentally-friendly option in today's market. With proper maintenance, the UT74121A ensures longevity and sustained performance, making it a valuable addition to any landscaping toolkit.

Overall, the Homelite UT74121A is a powerful and efficient solution for those seeking a reliable string trimmer. Its combination of a robust engine, user-centric design, and safety features makes it suitable for various lawn care tasks, ensuring gardens and lawns remain well-groomed year-round.
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