How to Change the Engine Drive Belt in a Troy-Bilt Model 77

If you need to change the engine drive belt on your Tory-Bilt 77 lawn mower, feel fortunate, because Troy Bilt designed the mower for quick and easy belt replacement without the need to remove and level the mower deck, which is often the case with other manufacturers. When you notice dry rotting or cracking on the drive belt, you must replace it. Otherwise, the belt will eventually break and the lawn mower will no longer power the mower deck.

Phillip's screwdriver
Open-ended wrench
3/8-inch ratchet

Instructions

- 1
  Lower the deck lift lever into the bottom notch on the right rear fender. This lowers the Tory Bilt's mower deck to the ground and enables the belt change.
- 2
  Remove the sheet metal screws that hold the belt guards onto the mower deck with a Phillip's screwdriver. Place the belt guards off to the side.
- 3
  Locate the engine pulley under the engine. Remove the belt-keeper rod by taking out the hex-head bolts that hold the belt keeper onto the bottom of the engine. Use an open-ended wrench for this step. Place the belt keeper off to the side.
- 4
  Make a diagram of how the belts route around the pulleys on the deck.
- 5
  Locate the idler pulley bracket on the left side of the mower deck and place a 3/8-inch ratchet into the square hole in the bracket. Rotate the idler pulley away from the belt to remove tension on the belt.
- 6
  Pull the belt off all the pulleys, including the engine pulley and the idler pulley. Route the new belt onto the deck. Follow the diagram you drew.
- 7
  Release the idler pulley and remove the ratchet from the square hole.
- 8
  Reattach the belt-keeper bar to the engine and the belt guards to the mower deck.

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