Troy-Bilt 643B Super Bronco Spark Plug Service, Spark Arrester Screen Service, OFF-SEASON Storage

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WARNING: Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Failure to follow these instructions can result in serious personal injury or property damage.

3.Clean around the oil dipstick or oil fill tube (whichever applies) to prevent dirt from falling into the crankcase.

4.On engines with an oil fill tube, remove the fill cap and add oil (if required) until it reaches the top of the fill tube. Reinstall the fill cap.

5.On engines with a dipstick, remove it and wipe it clean. Reinsert the dipstick, tighten it securely, and remove it. Add oil as needed to bring the level up to the FULL mark. Wipe dipstick clean each time oil level is checked. Do not overfill. Tighten dipstick securely.

B. To Change the Engine Oil:

Change the engine oil as instructed in the Engine Owner’s Manual.

SPARK PLUG SERVICE

Inspect and clean or replace the spark plug after every 100 operating hours or annual- ly. Refer to the Engine Owner’s Manual for spark plug service instructions.

In some areas, local law requires using re- sistor spark plugs to suppress ignition sig- nals. If the engine was originally equipped with a resistor spark plug, use the same type for replacement.

SPARK ARRESTER SCREEN SERVICE

If the engine muffler is equipped with a spark arrester screen, remove and clean it according to the service intervals and in- structions in the Engine Owner’s Manual.

THROTTLE LEVER ADJUSTMENT

If the engine does not respond to various throttle lever settings, refer to the Engine Owner’s Manual for service information or contact your local authorized engine dealer.

WARNING: Operators shall not tamper with the engine governor settings on the machine; the governor controls the maximum safe operating speed to protect the engine and all moving parts from damage caused by overspeed. Authorized service shall be sought if a problem exists.

CARBURETOR/GOVERNOR CONTROL ADJUSTMENTS

The carburetor was adjusted at the factory for best operating speed. Refer to the En- gine Owner’s Manual for any adjustment information or see your authorized engine dealer.

The governor controls the maximum safe operating speed and protects the engine and all moving parts from damage caused by overspeeding. Do not tamper with the engine governor settings.

OFF-SEASON STORAGE

When the tiller won’t be used for an extended period, prepare it for storage as follows:

1.Clean the tiller and engine.

2.Do routine tiller lubrication and check for loose parts and hardware.

3.Protect the engine and perform recom- mended engine maintenance by following the storage instructions found in the Engine Owner’s Manual. Be sure to protect the fuel lines, carburetor and fuel tank from gum deposits by removing fuel or by treating fuel with a fuel stabilizer (follow engine manufacturer’s recommendations).

4.Store unit in a clean, dry area.

5.Never store the tiller with fuel in the fuel tank in an enclosed area where gas fumes could reach an open flame or spark, or where ignition sources are present (space heaters, hot water heaters, furnaces, etc.).

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Contents 11/15/06 Form no -02357A.fmTable of Contents Finding Model NumberCustomer Support Do not put hands or feet near or under rotating parts Safety Alert SymbolKeep children and pets away Refer to the Maintenance sectionsUse slower engine speeds Check all nuts, bolts, and screws forOperating Symbols MaybeusedonthetillerandengineTo Avoid Serious Injury Assembly Steps AssemblyIntroduction Inspect UnitUse the handlebar to roll the tiller to a flat area Install Forward Clutch CableWith the Forward Clutch Bail Y, Fig While preventing the cable adjuster from turningCheck all nuts and screws for tightness Check Transmission OIL LevelFreewheel Ature package to identify the controls on your engineTo adjust the handlebars Travel Position Shallow SettingsTo operate the Forward Clutch Bail Stop all tiller motion by releasing the Forward Clutch BailIntroduction BREAK-IN Operation Following steps describe how to start and stop the engineStarting and Stopping Change engine oilOperating the Tiller For forward motion of the wheels and power to the tinesStopping the Engine and Tiller To move the Model 643C in reverse for short distancesTilling Tips & Techniques Tilling On Slopes Tilling Tips & Techniques CON’TClearing the Tines Read the following recommendations before tilling on slopesTerrace Gardening Loading and Unloading the TillerTiller Lubrication Transmission Gear OIL ServiceCheck Hardware Check Tire PressureRemoving⁄Installing a Tine Assembly Removing⁄Installing a Single TineBolo Tines Tine InspectionChecking and Adjusting Replacement Belt InformationTo Check Forward Belt Tension Engine Cleaning AIR Cleaner Service Engine OIL Service Forward Clutch Bail AdjustmentModels 643B & 645A only To Check Reverse Belt TensionSpark Arrester Screen Service Spark Plug ServiceOFF-SEASON Storage To Change the Engine OilProblem Possible Cause Correction TroubleshootingPage 643C, 643D 645A Description Models 643B, 643C, 643D & 645AGW-1224-3 Models 643B, 643C, 643D & 645A Models 643B, 643C, 643D & 645A 634-43203 Page Page TROY-BILT Tiller Lifetime Limited Warranty

643B Super Bronco specifications

The Troy-Bilt 643B Super Bronco represents a robust and versatile addition to the world of outdoor power equipment, designed with the needs of gardeners and landscapers in mind. This rear-tine tiller is a notable choice for those looking to cultivate their gardens efficiently and effectively.

One of the standout features of the Troy-Bilt 643B is its powerful 306cc OHV engine, which provides ample torque and ensures that the tiller can tackle tough soil conditions with ease. This engine is specifically designed for superior performance and reliability, allowing users to till effectively in a variety of soil types, from sandy loam to clay.

The tiller boasts a 12-inch tilling width and a tilling depth of up to 8 inches, making it ideal for preparing garden beds and landscaping areas. The adjustable tilling depth allows gardeners to customize their cultivation process, enabling them to penetrate deeper for planting larger crops or more shallow for seedbed preparation.

Equipped with a rear-tine design, the Super Bronco brings several advantages. The rear-tine configuration provides better control and stability while working, making it easier to maneuver in tight spaces. Furthermore, the counter-rotating tines help to break up compact soil while reducing the chances of soil clumping, resulting in a finer tilled surface.

Another remarkable feature is the Troy-Bilt patented "Smart Till" technology, which allows users to select the most suitable tilling method for their specific soil conditions. This innovative technology enhances efficiency, saves time, and ensures that the tiller delivers optimal results with every pass.

For ease of use, the tiller is equipped with large, easy-grip controls and a comfortable handlebar design that reduces fatigue during extended use. Additionally, the rugged construction and all-terrain tires enable the Troy-Bilt 643B to navigate challenging landscapes without issue.

The maintenance of the Super Bronco is user-friendly, with features that facilitate easy access to essential components for tune-ups and repairs. Overall, the Troy-Bilt 643B Super Bronco combines power, technology, and practicality, making it an excellent choice for both novice and experienced gardeners seeking to enhance their outdoor projects.
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