Changing the deck belt on the Huskee IT4200 lawn mower involves working around the spring and 2 belt drive guides in the motor area. Properly loading the spring before the guides is the secret to success.
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If you mean the deck belt of a 50" deck, then try the related link at one of my sites under MTD decks.
Remove the deck. First by pulling the pins that attach the lift brackets, and then remove the rear spring, and the 2 belt guides under the engine for the belt that drives the deck (1/4" socket). After the deck is out, release the spring that applies tention on the right idler pulley (you'll have to remove the 2 side pulley covers).
Normally you will find three safety switches on a Huskee riding mower. There is one for the clutch/brake pedal. There is another one for the deck lever and the main one that causes problems under the seat.
A model number would tell what deck you have.
How do you change a mower deck belt on a John Deere L130?Read more: How_do_you_change_a_mower_deck_belt_on_a_John_Deere_L130
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There can be several issues that will cause your lawnmower to make a whining noise. The most common reason is a bad bearing in the mower deck.
john deere LT155 38inch cut mower deck
How do you replace a mower deck belt on a stx38 hydro
Disingage the mower deck take off the mower deck look under neath their and replace the belt
There is usually a deck belt and a drive belt.
John Deere 210 38" mower deck drive belt: M40223 secondary drive belt