125601555/0 Deck Belt Pulley Replacement for Castelgarden / Stiga Mower Decks
Overview
This 125601555/0 deck belt pulley replacement is built for select Castelgarden / Stiga mower deck applications using the 125601555/0 pulley path.
This listing is intended for mower decks where the original pulley, idler, or spindle pulley number matches one of the replacement numbers listed below. It is a good replacement option when the deck has pulley bearing noise, belt tracking issues, belt squeal, wobble, vibration, or premature deck belt wear.
Important: Match your original pulley number whenever possible. Then confirm pulley diameter, bore size, belt width, groove style, mounting hardware, mower model, deck size, and belt routing before ordering.
Key Features
- Replacement mower deck pulley for select deck drive applications
- Primary Part Number: 125601555/0
- Quantity Included: 1 pulley
- Designed for mower deck applications using the listed pulley part-number path
- Ships as one pulley only
Compatible Brands & Model Series
This pulley is intended for select Castelgarden / Stiga mower decks using the 125601555/0 replacement pulley path.
- Common supplier application path: select mower deck applications
Fitment note: Model names are provided as fitment clues. Always confirm the original pulley number, pulley size, bore, groove style, and belt routing before ordering.
Replaces Common Deck Pulley Numbers
- Replacement numbers: 125601555/0, 25601555/0, 1136-0290-01, 17-911, 5320055-62
Pulley Specifications
- Part Type: Deck Belt Pulley
- Primary Replacement Number: 125601555/0
- Quantity Included: 1 pulley
- Pulley Diameter: confirm against original pulley or OEM diagram
- Bore Size: confirm against original pulley or OEM diagram
- Belt Groove / Belt Width: confirm against original pulley and deck belt
- Mounting Hardware: reuse or replace hardware as required by the mower deck
Before Ordering
Before ordering this deck pulley, confirm:
- Your original pulley number matches 125601555/0 or one of the listed replacement numbers
- Your mower deck uses the correct pulley diameter, bore size, and belt groove style
- Your deck belt width and routing match the original setup
- Your mower model and deck size match the listed application path
- Your idler arm, spindle shaft, mounting bolt, spacer, and belt guides are in usable condition
Do not install the pulley until fitment is confirmed. Installed deck pulleys may not be eligible for return.
Common Symptoms of a Worn Deck Pulley
- Deck belt squealing, slipping, or jumping off
- Noisy pulley bearing
- Pulley wobble or visible bearing play
- Uneven belt tracking
- Deck vibration
- Premature deck belt wear
- Burning belt smell or belt glazing
Installation Notes
- Park the mower on a level surface and disconnect the spark plug before working on the deck
- Take photos of the deck belt routing before removing the old pulley
- Inspect the belt, spindle bearings, idler arm, tension spring, belt guides, and mounting hardware
- Compare the new pulley to your original pulley before installation
- After installation, rotate the deck components by hand with the mower off to confirm there is no binding or belt misalignment
- Test the mower at low speed first and listen for belt tracking issues, squealing, or unusual noise
Why Buy From PTO Direct USA?
- Fast USA shipping
- Fitment-first product descriptions
- Clear part-number routing for mower deck repairs
- Deck parts organized by belts, blades, spindles, pulleys, and rebuild kits
- Support for homeowners, repair shops, and mower owners
Need Help Confirming Fitment?
If you are unsure whether this pulley fits your mower, send us your mower model number, deck size, original pulley number, and photos of your original pulley, deck belt routing, mower deck, and mower ID tag before ordering.
FAQ
What does this deck pulley replace?
This deck pulley replaces the 125601555/0 part-number path on select mower deck applications.
Can I order this pulley by deck size only?
No. Deck size is only a starting point. Match the original pulley number, pulley diameter, bore size, groove style, mower model, and belt routing before ordering.
Why does my mower deck belt keep coming off?
A deck belt may come off because of a worn pulley bearing, bent idler arm, weak tension spring, bad spindle bearing, damaged belt guide, incorrect belt routing, or the wrong belt size. Inspect the full deck drive system before installing a new pulley.
Need other deck parts for this setup? Browse mower deck belts, mower blades, spindle assemblies, and deck rebuild kits.
Need a different pulley? Browse the full deck pulleys and idlers collection.