AM135526 Flat Idler Pulley Replacement for John Deere Mower Decks
AM135526 Flat Idler Pulley Replacement for John Deere Mower Decks
Overview
This aftermarket AM135526 flat idler pulley is a replacement mower deck drive sheave for select John Deere lawn tractors and zero-turn mowers.
Use this pulley when the original part or model-specific John Deere parts diagram calls for AM135526. The flat pulley surface runs against the back side of the mower deck belt and helps maintain proper belt routing and tension.
Do not order by mower model or pulley appearance alone. John Deere mower decks can use several different idler pulleys in separate positions.
Key Features
- Aftermarket flat idler pulley assembly
- Primary Replacement Number: AM135526
- Product Type: mower deck flat idler pulley / drive sheave assembly
- Outside Diameter: approximately 132.5 mm – 5.22 inches
- Bore / Center Hole: approximately 17 mm – 0.67 inch
- Overall Height: approximately 30.5 mm – 1.20 inches
- Material: steel
- Designed to run against the flat or back side of the mower deck belt
- Complete replacement pulley with center bearing
Compatible John Deere Models & Series
This pulley fits select mower deck configurations within the following John Deere model families:
- X300 Series: X300, X304, X310, X320, X324, X330, X350, X350R, X354 and X370
- X500 Series: X500, X520, X534 and X540
- EZtrak and ZTrak: Z245, Z255, Z355E, Z425, Z435 and Z445
Fitment note: Not every deck configuration within these model families uses AM135526. Confirm the mower model, deck size, serial number and exact pulley callout in the model-specific parts diagram.
Replaces OEM Part Numbers
- John Deere AM135526
Aftermarket Cross-Reference Numbers
- Oregon: 34-103
- Stens: 280-241
- Rotary: 14242
- 8TEN: 810-CID2325L
Before Ordering
- Confirm the original pulley or OEM diagram calls for AM135526
- Verify the mower model, serial number and deck size
- Confirm the pulley runs against the flat side of the belt
- Compare the outside diameter, center-hole size and pulley height
- Inspect the mounting bolt, spacer and washers for damage
- Check the deck belt, tension spring and other pulleys for wear
Common Symptoms of a Worn Idler Pulley
- Grinding, rattling or squealing from the mower deck
- Deck belt repeatedly jumping off the pulleys
- Visible pulley wobble or bearing movement
- Uneven or damaged mower deck belt edges
- Excessive heat around the idler pulley bearing
- Reduced blade speed caused by poor belt tracking or tension
- Pulley that does not rotate smoothly by hand
A seized spindle, damaged belt, weak tension spring or misaligned mounting bracket can quickly damage a replacement pulley. Inspect the complete deck-belt system before installation.
What’s Included
- 1 aftermarket AM135526 flat idler pulley assembly
Why Buy From PTO Direct USA?
- Fast USA shipping
- Fitment-focused replacement-parts support
- Clear OEM part-number matching
- Replacement belts, blades, spindles and deck pulleys available
- Support for homeowners, repair shops and landscape crews
Need Help Confirming Fitment?
Still not sure which deck pulley fits your mower? Contact us for fitment help and send a clear picture of the mower identification tag or the original pulley part number.
FAQ
What does this idler pulley replace?
This aftermarket flat idler pulley replaces John Deere AM135526 on compatible mower deck applications.
What are the approximate AM135526 pulley dimensions?
The replacement pulley measures approximately 132.5 mm – 5.22 inches outside diameter, with a 17 mm – 0.67-inch bore and an overall height of approximately 30.5 mm – 1.20 inches.
Does AM135526 fit every John Deere X300 or X500 mower?
No. AM135526 is used on select mower deck configurations within the X300 and X500 families. Match the part number shown in the exact model and deck diagram.
Does AM135526 fit John Deere Z425?
AM135526 is used in select John Deere Z425 mower deck configurations. Because the deck can contain several different idler positions, confirm the AM135526 diagram callout before ordering.
Is AM135526 the same as AM128118 or AM143737?
No. These are separate John Deere pulley numbers that may be used in different positions within the same mower deck system. Do not substitute one for another unless the exact John Deere diagram or an official supersession specifically confirms it.
Which side of the belt contacts this pulley?
AM135526 is a flat idler pulley designed to run against the flat or back side of the mower deck belt.
Can I order this pulley by appearance?
No. Similar-looking pulleys can have different center holes, diameters, offsets and bearing locations. Match the original AM135526 part number and physical dimensions first.