[Fitment] for John Deere Ride-On Tractor X300 X304 X310 X320 X324 X330 X350 X350R X354 X370 X500 X520 X534 X540, for John Deere Ride-On Zero Turn Z245 EZTrak 48" Top Discharge Deck, for John Deere Z255 EZTrak 48" Deck, for John Deere Z355E ZTrak 48A 48TD Deck, for John Deere Z425 Z445 EZTrak 48" 54" Deck, for John Deere Z445 EZTrak 54" High C Deck, for John Deere Z435 EZTrak Residential 48" 54" Deck. [Function] OE Number:AM135526. It Only guides the belt (fixed position, no tension adjustment), It maintains proper tension on the accessory drive belt (serpentine belt) to ensuring smooth operation. It guides and redirects the belt around various engine components, prevents the belt from rubbing or jumping off pulleys. It reduces belt vibration and wear, absorbs vibration from the spinning belt, prolonging belt and component life. [Reliable Quality] No grooves, adopt with robust steel materials to withstand constant friction, heat, and mechanical stress, high strength enough to resists warping under tension, and handles heat well. Sealed Ball Bearing for smooth rotation, resists dirt/moisture, prolong the service life. Please check and replace the idler pulley when met issue like belt damage, belt chirping at startup or acceleration, visible wobbling when the engine runs etc. [Installation] 1. Disconnect the battery and cool engine. 2. Locate the bad idler pulley, relieve belt tension and slide the serpentine belt off the idler pulley. 3. Remove the center bolt and pull the old idler pulley. 4. Install the new idler pulley and reinstall the serpentine belt properly. 5. Reconnect the battery terminal, start the engine to check no noises or wobbling. Note: Check tensioner or belt alignment if belt squeals, check bolt if pulley wobbles. [Package] Include 1x Lawn Tractor Idler Pulley, Outer Diameter: 133.4mm/5.25in, Width: 31.8mm/1.25in, Inner Diameter: 17mm/0.67in. OE Number:
AM135526

Fitment
for John Deere Ride-On Tractor X300 X304 X310 X320 X324 X330 X350 X350R X354 X370 Select Series
for John Deere Ride-On Tractor X500 X520 X534 X540 Multi-Terrain Series
for John Deere Ride-On Zero Turn Z245 EZTrak 48" Top Discharge Deck
for John Deere Ride-On Zero Turn Z255 EZTrak 48" Deck
for John Deere Ride-On Zero Turn Z355E ZTrak 48A 48TD Deck
for John Deere Ride-On Zero Turn Z425 Z445 EZTrak 48" 54" Deck
for John Deere Ride-On Zero Turn Z445 EZTrak 54" High C Deck
for John Deere Ride-On Zero Turn Z435 EZTrak Residential 48" 54" Deck

Specifications
Material: Steel
Outer Diameter: 133.4mm/5.25in
Width: 31.8mm/1.25in
Inner Diameter: 17mm/0.67in
Package: 1 x Lawn Mower Idler Pulley
This is a non-OEM product, accessory only!

Features
It maintains proper tension on the belt (serpentine belt) to ensuring smooth operation.
It guides and redirects the belt around engine components, prevents the belt from rubbing or jumping off pulleys.
It reduces belt vibration and wear, absorbs vibration from the spinning belt.
No grooves, adopt with robust steel to withstand constant friction, heat, and mechanical stress, high strength to resists warping under tension, handles heat well.
Sealed Ball Bearing for smooth rotation, resists dirt/moisture, prolong the service life.

Signs of a Failing Idler Pulley:
High-pitched squealing or grinding (bad bearing).
Belt chirping at startup or acceleration.
Visible wobbling when the engine runs.
Belt damage (cracks, fraying from misalignment).