Troy-Bilt 640C-Tuffy Benutzerhandbuch

11

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.

The Forward Clutch Bail (E, 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 (E, 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). 

The Reverse Clutch Control (F, 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.

 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 
(F, 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).

This lever (G, Figure 3-5) controls the till-
ing 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.

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.

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.

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.