Troy-Bilt 643B Super Bronco To operate the Forward Clutch Bail, Travel Position Shallow Settings

A

D

B

C

Figure 3-3: FREEWHEEL position.

WARNING: Before starting engine, be sure that both wheels are in WHEEL DRIVE position. See Wheels Drive Pins for instructions.

Engaging the Forward Clutch Bail or Reverse Clutch Control (if equipped) when the wheels are not in WHEEL DRIVE could allow the tines to rapidly propel the tiller forward or backward.

Failure to comply could cause loss of tiller control, property damage, or personal injury.

FORWARD CLUTCH BAIL

The Forward Clutch Bail (D, Figure 3-4) controls the engagement of forward drive to the wheels and tines.

To operate the Forward Clutch Bail:

1.Put wheels in WHEEL DRIVE position (see “WARNING” statement above).

2.Lift and hold the clutch bail (D, Figure 3-

4) against the handlebar to start the wheels and tines rotating in a forward direction.

3.Release the clutch bail to disengage (stop) the wheels and tines (the engine will continue to run).

REVERSE CLUTCH CONTROL (Models 643B & 645A only)

The Reverse Clutch Control (E, Figure 3-4) controls the engagement of reverse drive to the wheels and tines. The reversing fea- ture is used for maneuvering the tiller only — never engage the tines in the ground while operating in reverse.

WARNING: Use extreme caution when reversing or pulling the machine towards you. Look behind to avoid obstacles.

Never attempt to till in reverse. Failure to follow this warning could result in personal injury or property damage.

To operate the Reverse Clutch Control:

1.Put wheels in WHEEL DRIVE position (see “WARNING” statement at the left).

2.Stop all tiller motion by releasing the Forward Clutch Bail.

3.Lift the handlebar until the tines clear the ground, look behind you to avoid any obstacles, and then pull the control knob (E, Figure 3-4) out. The wheels and tines will rotate in a reverse direction.

4.Release the control knob to disengage (stop) the wheels and tines (the engine will continue to run).

E

D

Figure 3-4: All models have a Forward Clutch Bail (E). Only Model 634A have a Reverse Clutch Control (F).

DEPTH REGULATOR LEVER

This lever (F, Figure 3-5) controls the tilling depth of the tines. Pull the lever back and slide it up or down to engage the notched height settings.

The “travel position” (highest notch) raises the tines approximately 1-1/2" off the ground, allowing the tiller to be moved without the tines contacting the ground. This setting should also be used when starting the engine.

Moving the lever upward will increase the tilling depth. The lowest notch allows a till- ing depth of approximately 6”, depending on soil conditions. For best results, always

begin tilling at a very shallow depth setting and gradually increase the tilling depth.

WARNING: Do not attempt to till too deeply too quickly. Gradually work down to deeper tilling depths.

Place the Depth Regulator Lever in the “travel” position before starting the engine. This position prevents the tines from touching the ground until you are ready to begin tilling. Failure to follow this warning could result in personal injury or property damage.

Travel Position	F
Shallow
Settings	Deep
	Settings

Figure 3-5: Depth Regulator Lever (G).

HANDLEBAR HEIGHT ADJUSTMENT

The handlebar height is adjustable to three different settings (Figure 3-6). In general, adjust the handlebars so they are at waist level when the tines are 3"-4" in the soil.

To adjust the handlebars:

1.Stop engine, disconnect spark plug wire from spark plug and allow engine to cool.

2.Remove hardware, reposition handle- bars, and reinstall hardware securely.

High

Medium

Low

Figure 3-6: Handlebar height adjustment.

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