How do I Replace the Hydro Belt on a 175 John Deere?

Written by eric w. thompson
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How do I Replace the Hydro Belt on a 175 John Deere?
The hydro belt on the John Deere mower drives the cutting blades when mowing a lawn. (Man mowing image by xymm from

The hydro drive belt on your 175 John Deere transmits rotary power from the engine to the cutting blades. If you have noticed that the blades are turning slower than usual or are not functioning at all, it is time to replace the hydro drive belt. The procedure for replacing the hydro belt is simple enough that you can save the money you would otherwise need to hire a mechanic by performing the job yourself.

Skill level:

Things you need

  • Ratchet and socket

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  1. 1

    Disconnect the spark plug connection with your hands, adjust the deck lever to the bottommost position, then unbolt and remove the belt guard from the middle of the mower deck using a ratchet and socket.

  2. 2

    Remove the drive belt from the engine pulley and the two idler pulleys beneath the lawnmower.

  3. 3

    Install the new belt onto the outer grooves of the clutch idler pulley, then turn the idler pulley one half turn and feed the rest of the belt onto the stationary idler pulley and the engine pulley.

  4. 4

    Reinstall the belt guard, readjust the deck lever to its original position, then start the mower and test the belt.

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