Idler sprockets
1. Place an M3 nut in each of the two side slots near the rear of the chassis. The slots are sized
so that nuts will not be able to rotate within them.
2. Place an idler sprocket on each shoulder bolt, followed by a washer. The protruding side of
the sprocket hub should face the same direction as the threaded end of the bolt (in toward
the chassis).
3. 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 Chassis User’s Guide
© 2001–2019 Pololu Corporation
3. Assembling the Zumo
Page 6 of 12
