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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).
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.
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.
Figure 3-3: FREEWHEEL position.
Figure 3-4: All models have a Forward Clutch
Bail (E). Only Model 634A have a Reverse
Clutch Control (F).
D
E
F
Deep
Travel Position
Shallow
Settings
Settings
Figure 3-6: Handlebar height adjustment.
Medium
High
Low
A
B
Figure 3-5: Depth Regulator Lever (G).