Schwinn Adult Tricycle Owner's Manual page 46

Drivetrain (pedals, chains, chainwheel, crank set, freewheel)
Frequency: as noted
Inspect
Pedals
Pedal Bearings
Chains
43
Action
Every month, check each pedal is securely
set and tighten into the crank arm .
Before each ride, check each front and rear
pedal reflectors are clean and in place.
Every month, check the pedal bearings
are properly adjusted . Move the pedal
up and down, left and right . If looseness
or roughness is detected adjustment,
lubrication or replacement is required .
Every week, check the chains are clean,
properly lubricated, rust free, and is not
stretched, broken, or have stiff links .
Every week, check chain tension is correct
on both chains:
1 . Set a straightedge against the bottom of
the front chainwheel and rear sprocket .
2 . Pull up on the bottom of the chain .
3 . If movement is more than 10 mm adjust
the position of the rear frame .
Maintenance
If necessary, re-set and tighten .
Clean or replace .
See tricycle mechanic for repair .
Lubricate if necessary . Replace if rusted,
stretched, or broken .
Loosen bolts holding the rear frame and
move it until the chain is taut and moves
less than 10 mm . Check the rear frame is
"square" to the main frame and firmly tighten
the bolts holding the rear frame .