16. Solder the two individual contacts to the shield from the top. You might want to temporarily tape
the contacts inside the chassis to hold them in place while you solder them, or you can use a battery to
temporarily hold them in place while you solder. Note that the battery might act as a heat sink, making it
more difficult to solder or requiring a higher soldering iron temperature. The battery terminal slot in the PCB
should be completely filled with solder as shown in the picture below.
Sprockets and track
17. Place an idler sprocket on each shoulder bolt, followed by a washer. The side of the sprocket with
“teeth” should face the same direction as the threaded end of the bolt, so that the teeth end up pointing in
towards the chassis.
18. Insert the shoulder bolts through the side of the chassis into the nut. Use a 3 mm hex key (Allen wrench)
to tighten the bolts until the washers are snug against the chassis. Be careful not to overtighten the shoulder
bolts as doing so can bend the washers.
Pololu Zumo Shield for Arduino User's Guide
© 2001–2012 Pololu Corporation
2. Assembly
Page 13 of 28
