Schwinn none - Manual (Page 103)

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Lubrication
All the pivoting points of the front and rear derailleurs should be
lubricated with light oil at least every month. Be sure to wipe off any
excess oil to prevent attraction of dirt into the mechanisms. The shifting
cables should be cleaned and re-coated with a thin layer of grease
every six months, or whenever new cables are being installed.
Adjustment - Rear Derailleur
The Low limit screw determines how far the rear derailleur will travel
toward the wheel of the bicycle, while the High limit screw determines
how far the cage will travel toward the frame.
1. Shift the rear shifter to the largest number indicated, disconnect the
rear derailleur cable from the cable anchor bolt and place the chain
on the smallest sprocket.
2. Adjust the High limit screw so the chain and the smallest sprocket
are lined up vertically. Remove any slack in the cable by pulling it
taut, then re-connect the cable and tighten the cable anchor bolt securely.
3. Shift up through the gears making sure that each gear is achieved quietly
and without hesitation.
If noise occurs, use the barrel adjuster to fine-tune the cable tension.
Turning the barrel adjuster clockwise will decrease cable tension and
allow the derailleur cage to move farther away from the bicycle in small
increments. Turning counter-clockwise will increase cable tension and
bring the cage closer to the bicycle. This will micro-adjust the positioning
of the derailleur cage in relation to the freewheel. Simply put; turn the
barrel adjuster the direction you want the chain to go.
4. Shift the chain onto the largest sprocket; adjust the low limit screw so the
chain and the largest cog are lined up vertically. If you are unable to get
the chain to the largest cog, turning the Low limit screw counter-clockwise
will enable the chain to move towards the wheel.
5. Shift through the gears ensuring each gear is achieved quietly and without
hesitation.
NOTE: It may take several adjustments to achieve the desired positioning.
Please refer to the troubleshooting section for more assistance.
Rear Derailleur Rear View
Freewheel
SIS Cable Adjuster
Outer side of Top Gear
Pulley Adjustment
Screw
Guide Pulley
Tension Pulley
Adjustment
Screws
Rear Derailleur Side View
SIS Cable
Adjuster
High Gear
Adjustment Screw
Low Gear
Adjustment Screw