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.

FORWARD CLUTCH

BAIL ADJUSTMENT

If the Forward Clutch Bail does not func- tion properly, first check that the forward drive belt is adjusted properly (see Check- ing and Adjusting Forward Drive Belt Ten- sion). If this fails to correct the problem, contact Troy-Bilt LLC or your authorized dealer for service advice.

CHECKING AND ADJUSTING RE- VERSE DRIVE BELT TENSION

(Model 644A only)

It is important to maintain correct tension on the reverse drive belt. A loose belt will cause the tines and wheels to slow down – or stop completely – even though the en- gine is running at full speed.

When checking belt tension, also check the belt for cracks, cuts or frayed edges and replace it as soon as possible.

•Check belt tension after the first two hours of break-in operation and after every 10 operating hours.

To Check Reverse Belt Tension:

1.Stop engine, wait for all parts to stop moving and disconnect spark plug wire.

2.Remove screw in plastic belt cover and slide belt cover (which is attached to for- ward clutch cable) out of the way.

3.Have an assistant pull the Reverse Clutch Control knob all the way out and hold it in that position. Measure the length of the cable wire between the end of the threaded cable adjuster (A, Figure 5-5) and the end of the Z-fitting (B) to which the ca- ble wire is attached.

4.The belt tension is ideal if the cable wire length measures between 1/8" to 1/4". If it is less than 1/8" (and if there is no reverse ac- tion when the tiller is running), then make the following adjustments

NOTE: If the length is more than 1/4", no ad- justment is needed—as long as the reverse action functions properly.

5.Release the Reverse Clutch Control knob.and then unthread the inner jam nut (C, Figure 5-6) one to two turns. Pull the threaded cable adjuster (A, Figure 5-6) to the left until the inner jam nut (C) touches the bracket.

6.Prevent the inner jam nut (C) from turn- ing and tighten the outer jam nut (D) against the bracket. Prevent the outer jam nut (D) from turning and tighten the inner jam nut (C) against the bracket.

7.Measure the gap by repeating Step 3. Readjust as needed by repeating Steps 5 and 6.

8. Reinstall the belt cover.

A B

Figure 5-5: Measure cable wire length to check for correct reverse belt tension.

D C A

Figure 5-6: Move threaded adjuster (A) to left to increase belt tension.

Replacement Belt Information

If the drive belt needs to be replaced, see your local authorized dealer or refer to the Parts List for ordering information. Use only a factory-authorized belt as an “over- the-counter” belt may not perform satis- factorily. The procedure requires average mechanical ability and commonly available tools.

ENGINE CLEANING

Keeping the engine clean will help to en- sure smooth operation and prevent dam- age from overheating. Refer to the Engine Owner’s Manual for engine cleaning ser- vice intervals and instructions. Be sure that the muffler is cool before servicing the engine.

AIR CLEANER SERVICE

The air cleaner filters dirt and dust out of the air before it enters the carburetor. Op- erating the engine with a dirty, clogged air filter can cause poor performance and damage to the engine. Never operate the engine without the air cleaner installed. In- spect and service the air cleaner more of- ten if operating in very dusty or dirty conditions. Refer to the engine Owner’s Manual for air cleaner service intervals and instructions.

ENGINE OIL SERVICE

Check the engine oil level before each use and after every five hours of continuous operation. Running the engine when it is low on oil will quickly ruin the engine.

It is recommended that you change the motor oil after every 10 hours of operation and even sooner when operating in ex- tremely dirty or dusty conditions. Refer to the Engine Owner’s Manual for detailed service instructions.

A. To Check the Engine Oil Level:

1.Park the tiller on a level area and shut off the engine.

2.Level the engine (use the Depth Regula- tor Lever to adjust the engine angle).

20

Page 19 Page 21
Page 20
Image 20
Troy-Bilt 640C - Tuffy CRT, 644A - Super Bronco CRT, 640C-Tuffy manual Forward Clutch Bail Adjustment, Model 644A only
Page 19 Page 21

640C - Tuffy CRT, 644A - Super Bronco CRT, 640C-Tuffy CRT, 640C-Tuffy specifications

The Troy-Bilt 640C-Tuffy and the 644A-Super Bronco CRT are exemplary models in the realm of cultivators and tillers, merging robust performance with user-friendly features. These machines are designed to make garden preparation easier and more efficient, catering to both amateur gardeners and seasoned horticulturists alike.

The Troy-Bilt 640C-Tuffy boasts a powerful engine and features a rear-tine design, enabling the user to tackle tough soil with ease. One of its main features is the Carbide Tines that effectively break up hard ground and aerate the soil, promoting healthy growth. The 640C-Tuffy is sturdy, with durable construction that ensures longevity and resilience against tough garden conditions. It also includes a 10-inch tilling width, allowing it to cover substantial ground in shorter periods. Moreover, the model is equipped with adjustable tilling depth settings, accommodating various types of gardening tasks from breaking new ground to preparing existing beds.

On the other hand, the 644A-Super Bronco CRT highlights innovative technology that makes tilling a breeze. This model features counter-rotating tines which effectively mix compost and soil, offering improved mixing and aeration. The 644A is known for its robust performance, powered by a reliable engine, which delivers consistent torque even on challenging soil types. Additionally, its 18-inch tilling width allows for broader coverage, resulting in efficient garden preparation.

Both models are equipped with ergonomic handlebars designed for operator comfort. These handlebars are adjustable, allowing users of different heights to find a comfortable grip, thus reducing fatigue during extended use. The 640C-Tuffy and 644A-Super Bronco CRT are designed with ease of operation in mind, featuring intuitive controls and a lightweight design that makes maneuvering effortless.

In terms of maintenance, both models boast easily accessible components which allow for simple servicing and routine upkeep, ensuring long-lasting performance. Additionally, these cultivators are built with safety features, including protective shields that guard against debris.

In summary, the Troy-Bilt 640C-Tuffy and 644A-Super Bronco CRT shine in their ability to combine cutting-edge technology, user-friendly operation, and robust design, making them ideal choices for anyone looking to enhance their gardening experience. Whether preparing a new garden bed or maintaining an existing one, these cultivators are engineered to deliver exceptional results with ease and confidence.
Top Page Image Contents