Pulling
Tractor
User Guide
Pulling Tractor User Guide 66802 V0515
1
66802 V0515
Cautionary and Warning Statements
• This kit is designed and intended for educational purposes only.
• Use only under the direct supervision of an adult who has read and understood the instructions
provided in this user guide.
• Read warnings on packaging and in manual carefully.
Materials Included
• Sheet of laser-cut basswood parts
• 4 Phillips head screws (two 4-40 x 1/4 Lg. and
two 6-32 x 1/2 Lg.)
• Motor with prewired connectors
• AA battery
• Battery module
• Gear font
• 4 axles
Items Required (not included)
• HD Bond II (or other white glue)
• Phillips head screwdriver
Building the Tractor
1. Pop out the laser-cut parts from the
basswood sheet. Lay a Part 1 piece
at on its side. In the rst slot on
Part 1, the front of the tractor, glue
a Part 2. Moving back on the tractor
from the top to the bottom, glue in
the Part 3, the other Part 2, and the
Part 4 (Figure 1).
• 30 metal washers
• 4 wheels
• 2 self-adhesive foam tabs
• 2 hex nuts (6-32)
• 4 rubber bands
• 8 spacers
• Wooden rod
• 2 #4 nylon washers
2. Glue the other side of all pieces in
the rst Part 1. Place the other Part
Figure 1
1 onto the parts so they t snugly
into the same notches (Figure 1).
3. Glue the Part 5 into the slot on Part
4 with the hook on Part 5 facing the rest of the
tractor (Figure 1).
4. Take the wooden rod and glue it into the hole on
Part 3 (Figure 1).
Installing the Motor and Battery Module
1. On the bottom middle of Part 1, slide the motor
into the opening so that the holes on the motor
line up with the holes on Part 1. Note: You can
install the motor on either Part 1 piece (Figure 2).
2. Attach the motor to the tractor body using two
4-40 x 1/4 Lg. screws and the two small nylon
washers (Figure 2).
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Figure 2
Pulling Tractor User Guide 66802 V0515
3. Place a 6-32 x 1/2 Lg. screw into the hole at the end
of each wire coming from the motor. Put each screw
through a hole beneath the rectangular indentation
near the front of the tractor. Make sure that the head of
the screw is on the inside of the tractor, and secure the
screws in place with a nut (Figure 3).
4. Remove the foam tabs from the paper, and apply one to
the bottom of the battery module on each end.
5. Remove the backing from the foam tabs, and place the
battery module into the rectangular indentation near
the front of the tractor (Figure 4).
Attaching the Wheels and Gears
Note: The following is one of many gear combinations
you could use. You don’t have to use the gears in the
instructions. This is just one way to get the tractor moving.
1. Insert a 2-3/4" axle through the front hole in the tractor
and push a small wheel on each end (Figure 5).
2. Remove the 10T gear with a 2 mm hole from the gear
font and place it on the end of the motor post (Figure 5).
Figure 3
3. Insert a 2-3/4" axle through the third hole from the
motor. Put a spacer on each end of the axle. On the end
of the axle by the motor post, attach a 50T gear with
a 1/8" axle hole and attach a 10T gear with a 1/8" axle
hole on the other end (Figure 6).
4. Put a rubber band around the edge of both large
wheels.
Figure 4
Figure 5
Pulling Tractor User Guide 66802 V0515
Figure 6
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5. Insert the 4" axle through
the eighth hole from the
back of the tractor. Put four
spacers on the end of the
axle closest to the motor
and put two spacers on the
other end (Figure 7).
6. On the end with four
spacers, attach a large
wheel. On the end with two
Figure 7
spacers, attach a 60T gear
with a 1/8" hole so that it
meshes with the 10T gear in front of it. About 1/2"
away from the 60T gear, attach a big wheel to the
end of the axle (Figure 7).
Driving the Tractor
1. Place the AA battery into the battery module.
2. To make the tractor move, attach the red wire
clamp to the screw coming from the red wire on
the motor and attach the black wire clamp to the
screw coming from the black wire on the motor.
This will make the tractor move forward. To make
it go in reverse, switch the clamps to the opposite
screws (Figure 8).
Activities
• Try out dierent gear ratios to see which
combinations give you the best torque.
• Add metal washers to the back of the tractor to
see how that aects the torque of the current gear
ratio.
P.O. Box 1708 • Pittsburg, KS 66762
www.pitsco.com
Toll-Free Orders 800-835-0686
Figure 8
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