Husky T-124C Owners Manual And Assembly page 15

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The crank and bottom bracket parts must be secure. As with the headset
and fork, the crank should spin on its axle through the bottom bracket
freely and without any friction or resistance.
To test the cranking action, have someone lift the rear end of the tricycle.
You should be able to crank the bike and spin the right-side rear wheel
with one hand. If you are not able to crank using one hand or you feel too
much resistance, or if the crank wobbles inside the bottom bracket, you
may have a component failure in your drive system or need to adjust the
bolts and nuts. Have the bicycle inspected by a mechanic.
CAUTION: Keep your hands and fingers away from the
spinning wheel, the moving chain, or the sprockets at all times to prevent
injury.
CHAIN AND REAR SPROCKETS
This tricycle has a split drive system. A double sprocket coaster brake
hub transfers the power from the front crank to rear axle When you pedal
forward, power is transferred from crank to the coaster brake hub by one
chain (long chain) and then transferred from the coaster brake hub to the
rear axle by the second chain (short chain).
Coaster brake hub
When riding your tricycle, these chains are under constant pressure and
tension. If the chain is too loose, it may jump off the sprocket and break
the link between the crank set and rear wheel. If the chain is too tight, it
may warp the crank set, damage the coaster brake, or the bottom bracket
bearings. Too much tension on the small chain can cause excess
wear on the rear axle and axle sprocket.
The chain guard protects your legs and clothes from contact with moving
chain and sprocket. If you hear rattling during when riding the tricycle, the
chain or crank arm may be rubbing against the chain guard. You can
eliminate the noise by adjusting the chain guard.