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Guide to Assembling the Tamiya Double
Gearbox
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Tamiya makes a line of inexpensive but useful
gearboxes. The hardest part of using the Tamiya gearboxes is the assembly.
The instruction sheet is very compact, making it hard to understand and
follow. So to make everyone's life a little easier, this guide details the
steps required to assemble the Double Gearbox using the 38.2:1 or the
344.2 gear ratio.
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Step 1 - Unpacking the Parts
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 The
Double Gearbox comes unassembled with a 1-page instruction sheet.
The sheet shows a exploded view of the gearbox for each gear ratio. This
type of assembly instructions can be frustrating since it doesn't really
tell in what order to assemble the parts.
In the box, you'll find
- The Instruction Sheet
- 2 bags containing plastic gears
- 1 bag containing the motors, axles and screws
- The plastic gearbox housing
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The kit contains many small parts that can be
easily dropped and lost. I recommend using a
small bowl or other container to hold the parts while you're assembling
the gearbox. One lost pinion gear and you're stuck!
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 As
I had mentioned, there are a lot of small parts in this kit. The picture
to the right can help you identify the different parts.
From left to
right, each row:
Purple Pinion
Gear
Yellow G2 Crown
Gear
Blue G3 Gear
Yellow G4 Final
Gear
Aluminum Spacer
Short Round
Steel Axle
Yellow Long
Plastic Bushing
Yellow Short
Plastic Bushing
Brass Eyelet
Brass Gear Hub
Brass Set Screw
Long Hexagon
Steel Axle
Short Machine
Screw (not used)
8mm Mounting
Screw
18mm Tapping
Screw
Next,
decide what gear ratio you want to assemble and click the appropriate link
below.
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Click
Here for 38.2:1 Gear Ratio
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Click
Here for 344.2:1 Gear Ratio
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