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.

 

 

 

 

 

 

 

b. Unthread the hex nut (C, Figure 5-4)

 

 

 

 

 

 

 

halfway up the adjustment screw (D).

 

 

 

 

 

 

 

c. Unhook the top of the spring from the

 

 

 

 

 

 

 

Forward Clutch Bail.

 

 

 

 

 

 

 

d. Use pliers to prevent the adjuster (B)

 

 

 

 

 

 

 

from turning and turn the slotted screw lo-

 

 

 

 

 

 

 

cated inside the spring clockwise (viewed

 

 

 

 

 

 

 

from operator’s position) to increase ten-

 

 

 

 

 

 

D

sion on the spring. Turn the screw counter-

 

 

 

 

 

 

clockwise to decrease tension. Once

 

 

 

 

 

 

 

adjusted, reattach the spring to the For-

 

 

C

 

 

 

 

ward Clutch Bail.

 

 

 

 

 

 

e. Repeat Steps 2 and 3 to re-measure the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

length of the spring. When the second mea-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

surement is between 1/16" -to- 3/16" longer

 

 

A

 

 

 

B

than the first measurement, retighten the hex

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

nut (C) against the top of the adjuster (B).

FORWARD

 

 

 

 

 

 

 

 

 

 

 

Replacement Belt Information

 

 

 

 

 

 

 

If the drive belt needs to be replaced, see

Figure 5-3: Install tines so that cutting edge of tines enter soil first when tiller moves forward.

your local authorized dealer or refer to the

 

 

 

 

 

 

 

CHECKING AND ADJUSTING

tension is correct if this second measure-

Parts List for ordering information. Use

FORWARD DRIVE BELT TENSION

ment is between 1/6" -to- 3/16" longer than

only a factory-authorized belt as an “over-

the-counter” belt may not perform satis-

It is important to maintain correct tension

the first measurement.

 

4. If the spring is too short (less than

factorily. The procedure requires average

on the forward drive belt. A loose belt will

mechanical ability and commonly available

1/16"), the tension is too loose. If the

cause the tines and wheels to slow down —

tools.

spring is too long (more than 3/16"), the

or stop completely — even though the en-

 

 

tension is too tight.

 

 

 

 

gine is running at full speed. A too tight

 

 

 

 

5. To adjust the length of the spring:

 

 

belt can result in unintentional tine move-

 

 

ment when the clutch bail is in the Neutral

a. Release the Forward Clutch Bail.

 

 

(released) position.

 

 

 

 

 

 

 

 

 

 

5

 

• Check belt tension after the first two

 

 

 

 

 

 

 

 

 

 

 

hours of break-in operation and after every

 

 

 

 

4

 

10 operating hours.

 

 

 

3

 

 

 

 

 

 

 

 

 

 

• At the end of each tilling season, check

 

 

A

2

 

 

the belt for cracks, cuts or frayed edges

 

 

 

 

 

 

C

 

 

 

 

and replace it as soon as possible.

 

 

1

 

 

 

B

 

 

 

 

 

 

 

 

To Check Forward Belt Tension:

 

 

 

 

 

 

 

 

D

 

 

1. Stop engine, wait for all parts to stop

 

 

 

 

 

 

 

 

 

 

 

moving and disconnect spark plug wire.

 

 

Hold bail against handlebar while

 

2. With the Forward Clutch Bail in an open

 

 

 

 

 

taking second measurement of spring

 

(released) position, measure and note the

 

 

 

 

 

 

overall length of the cable spring (A, Figure

 

 

 

 

 

 

5-4) by measuring from the outermost coil

 

 

 

 

 

 

to the outermost coil.

 

 

 

 

 

 

 

Figure 5-4: To check forward belt tension, take two measurements of the

3. Squeeze the Forward Clutch Bail against

 

 

overall length of the coils in the spring — first with the clutch bail open,

the handlebar (see Figure 5-4) and re-

 

then with the clutch bail closed against the handlebar.

measure the length of the coils. The belt

 

 

 

 

 

 

 

 

 

 

 

19

 

 

 

Page 18 Page 20
Page 19
Image 19
Troy-Bilt 643B Super Bronco manual Checking and Adjusting, Replacement Belt Information, To Check Forward Belt Tension
Page 18 Page 20

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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