Xiaoyudou Mower Idler Pulley & 44" Cogged Deck Belt Kit — 140‑tooth, 3/4" Wide, Heavy‑Duty

The Xiaoyudou kit delivers a replacement mower idler pulley and a cogged synchronous deck belt engineered to restore deck drive performance on compatible TimeMaster, TurfMaster and Exmark walk‑behind mowers.

This kit combines a heavy‑duty idler pulley and a 140‑tooth cogged deck belt sized to match OE fitments so you can repair a worn deck drive path quickly. The pulley matches several factory part numbers and the belt is a cogged drive type, 44" long and 3/4" wide, built to resist heat and flexing during mower operation. Each component is factory tested for strength and wear resistance, and the kit ships with a two‑year warranty and customer support from Xiaoyudou.

Which models and original part numbers does this kit replace?

The kit is specified to swap directly for common OEM idler and belt numbers so you avoid measurement guesswork. It covers multiple part references for the idler pulley and the synchronous deck belt used on many 30" and 76cm walk‑behind machines.

• Idler pulley replacements: 131‑4529, 121‑5763, 125‑2532, 126‑0316, 131‑4506, 131‑4509.
• Belt replacements: 120‑3335, 265‑610 (also listed as 1203335 variants).
• Compatible machines include TimeMaster 30"/76cm, TurfMaster walk‑behind series, and select Exmark models (ECS180, CKA30000, ECKA30).

What are the exact dimensions and material qualities?

Dimensions are provided so you can confirm fit before installing: the pulley and belt match the deck drive geometry for compatible models. Materials and finishing focus on durability for repeated deck starts and belt tension cycling.

• Idler pulley: overall length 2 3/4" (2.75"), height 1"; hole outside diameter 1.4", inside diameter 0.7".
• Belt: cogged-type drive belt, total 140 teeth, 44" length, 3/4" width for proper meshing and flexibility.
• Construction: metal pulley with wear‑resistant bearing surfaces and a reinforced rubber cogged belt to resist heat, cracking and stretch.

How easy is installation and what should I expect during replacement?

Installation is a straightforward bolt‑on replacement if your mower uses the listed part numbers or models. Basic hand tools are typically enough; remove the deck belt and old idler, install the replacement pulley, route the new cogged belt per your mower diagram, then tension and test the deck engagement.

• Tools required: common wrenches, socket set and possibly pliers for spring removal.
• Time estimate: most users complete the swap in 30–60 minutes depending on access and experience.
• Tip: consult your mower’s deck routing diagram and use the two‑year warranty contact if you need fitment help.

Who is this for: The Xiaoyudou 131‑4529 & 120‑3335 kit is intended for lawn care pros, homeowners and maintenance teams repairing TimeMaster, TurfMaster or compatible Exmark walk‑behind mowers that need a reliable deck drive overhaul. Choose this kit if you want direct OE number compatibility, a cogged belt sized for proper deck engagement, and a corrosion‑resistant pulley designed to reduce downtime and repeat replacements. If you’re unsure about fit, compare your mower’s current idler dimensions and belt tooth count or contact Xiaoyudou support for guidance under the included two‑year warranty.