Troy-Bilt 643B Super Bronco manual While preventing the cable adjuster from turning

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4.Check for correct tension on the forward drive belt by taking two measurements of the cable spring, as follows:

a. With the Forward Clutch Bail (Y, Fig. 2-

6)in an open (released) position, measure the length of the cable spring (W) from the outermost coil to the outermost coil.

b. Squeeze the Forward Clutch Bail against the handlebar (see Fig. 2-7) and re-mea- sure the spring length. The belt tension is correct if this second measurement is be- tween 1/16" to 3/16" longer than the first measurement. If so, turn the hex nut (Z, Fig. 2-7) tightly against the cable adjuster

(X)while preventing the cable adjuster from turning.

c. If the spring length is incorrect, you must adjust the cable tension as described in Checking and Adjusting Forward Drive

6

5

4

3

2

Z

1

X

 

Hold bail against handlebar while taking second measurement of spring

Fig. 2-7: To check forward belt tension, take two measurements of the length of the coils in the spring — first with the bail open, then with the bail held against the handlebar.

Belt Tension in Section 5. Incorrect cable tension can result in belt slippage (cable tension too loose), or unintentional tine movement when the clutch bail is in Neu- tral (cable tension too tight).

Y

W

V

W

Z

 

X

 

Fig. 2-5: Cable

Fig. 2-6: Attach forward

spring and

clutch cable spring to

adjuster.

forward clutch bail.

STEP 5: INSTALL REVERSE CLUTCH CABLE (MODELS 643B AND 645A ONLY)

1.Unwrap the reverse clutch cable (CC, Fig. 2-8 and Fig. 2-9) from its shipping po- sition and route it up to the handlebar. Be sure that the cable is routed beneath the Forward Clutch Bail.

2.Insert the cable (CC, Fig. 2-8) through the slot in the cable bracket and position the flat side of the threaded assembly next to the flat side of the hole. Slide the hex nut (DD) up the cable and tighten it securely.

3.Fasten the reverse clutch cable to the left side handlebar with a cable tie (EE, Fig. 2-9).

4.Test the function of the reverse clutch by pulling out and releasing the cable knob. The knob should return to its neutral posi- tion (resting against bracket). If it doesn’t, contact your local dealer or Troy-Bilt LLC for technical assistance.

BB

DD

CC

Flat Side

Fig. 2-8: Install reverse cable bracket and reverse clutch cable.

CC

BRONCO

EE

Fig. 2-9: Route reverse clutch cable (CC) as shown. Attach with cable tie (EE).

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Contents Form no -02357A.fm 11/15/06Customer Support Table of ContentsFinding Model Number Safety Alert Symbol Do not put hands or feet near or under rotating partsRefer to the Maintenance sections Keep children and pets awayUse slower engine speeds Check all nuts, bolts, and screws forTo Avoid Serious Injury Operating SymbolsMaybeusedonthetillerandengine Assembly Assembly StepsIntroduction Inspect UnitInstall Forward Clutch Cable Use the handlebar to roll the tiller to a flat areaWhile preventing the cable adjuster from turning With the Forward Clutch Bail Y, FigCheck Transmission OIL Level Check all nuts and screws for tightnessAture package to identify the controls on your engine FreewheelTravel Position Shallow Settings To adjust the handlebarsTo operate the Forward Clutch Bail Stop all tiller motion by releasing the Forward Clutch BailFollowing steps describe how to start and stop the engine Introduction BREAK-IN OperationStarting and Stopping Change engine oilFor forward motion of the wheels and power to the tines Operating the TillerStopping the Engine and Tiller To move the Model 643C in reverse for short distancesTilling Tips & Techniques Tilling Tips & Techniques CON’T Tilling On SlopesClearing the Tines Read the following recommendations before tilling on slopesLoading and Unloading the Tiller Terrace GardeningTransmission Gear OIL Service Tiller LubricationCheck Hardware Check Tire PressureRemoving⁄Installing a Single Tine Removing⁄Installing a Tine AssemblyBolo Tines Tine InspectionTo Check Forward Belt Tension Checking and AdjustingReplacement Belt Information Forward Clutch Bail Adjustment Engine Cleaning AIR Cleaner Service Engine OIL ServiceModels 643B & 645A only To Check Reverse Belt TensionSpark Plug Service Spark Arrester Screen ServiceOFF-SEASON Storage To Change the Engine OilTroubleshooting Problem Possible Cause CorrectionPage 643C, 643D 645A Models 643B, 643C, 643D & 645A DescriptionGW-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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