Serial Number; Troubleshooting - Schwinn A.C. Classic Service Manual

Serial Number

Find the serial number on the underside of the machine base. Decode the information in the serial number with the below instructions:
XXXXXX - SKU
VVV - NLS Vendor Code
WKYY - Week/Year
9999 - Machine that made production run
Problem: Chain is too loose, tight, or making a grinding sound.
Solution:
1. Use a 15mm wrench or socket to loosen flywheel nuts (A) and
tensioning screws so that when you grab a pedal and try and
move it back and forth, you can feel play in the chain.
2. Use a 3mm Hex wrench to gradually tighten the drive side ten-
sioning screw (B) until you cannot feel any free play.
3. Check for free play with the crank in the 12, 3, 6, and 9 o'clock
positions in case there is a loose or tight spot and make sure
there is no play.
4. Add an additional 1/2 turn on the drive side tensioning screw.
This should help keep the chain tensioned as it is new and
breaks in.
5. Tighten the non-drive side tensioning screw to align and center
the flywheel in the brake assembly.
6. Tighten both flywheel nuts.
NOTE: Make sure that the flywheel aligns with the frame.
Serial Number

Troubleshooting

5
A
B