Description
Overview:
This genuine Husqvarna pulley is a key power‐transmission component for selected walk‐behind and rider lawn mowers. Built with a durable metal body to cope with regular use, it helps transfer drive from the engine to the belt system, keeping the deck or drive running smoothly under load. It is a direct replacement for MPN 539919078 (also written as 539 91 90‐78), ensuring the correct fit and alignment on compatible machines. Ideal for maintaining performance on models such as the W3213A and RC 318T, this pulley restores efficient belt tracking and reduces downtime caused by wear or slippage. A precise OEM part, it supports reliable mowing across domestic gardens and commercial sites where consistent, clean cutting results are required.
Key Features:
- Genuine Husqvarna OEM part for assured fit and compatibility
- Robust metal construction to withstand everyday and professional use
- Accurate running surfaces support smooth belt tracking and reduced slippage
- Helps maintain correct blade and drive speeds for consistent cutting performance
- Direct replacement for MPN 539919078 / 539 91 90‐78
- Designed for Husqvarna W‐series walk‐behinds and RC rider mowers listed below
- Straightforward to install with standard hand tools, minimising downtime
- Supports long service life when used with a properly tensioned belt and aligned hardware
Typical Applications:
Used in the mower's belt drive to transmit power to the cutter deck or drive system on compatible Husqvarna machines. Suitable for routine maintenance or when a worn, noisy, or damaged pulley affects belt tracking, speed, or cut quality. Ideal for grounds care, landscaping, and domestic lawn maintenance where reliable performance and minimal downtime are important.
Also known as:
Deck pulley, idler pulley, V‐belt pulley, belt sheave, belt roller, deck drive pulley, transmission pulley.
Fits Models:
R111 B, R111 B Rider, R111 B5, R111 B5 Rider, R111B, R111B5, R112 C, R112 C Rider, R112 C5, R112 C5 Rider, R112C, R112C5, R115 B, R115 B Rider, R115 C, R115 C Rider, R115B, R115C, RC 318T, RC 318T Rider, RC 320Ts AWD, RC 320Ts AWD Rider, RC318T, RC320TsAWD, W3212A, W3213A, W3213P, W3612A, W3613A, W3613P, W3614A, W4814A, W4815A, WG3213P, WG3613E, WG3613P, WG4815E, WG4815P, WH3614, WH4817EFQ, WH5219EFQ, WH5221EFQ, WHF4215ETS, WHF4818ETS, WHF5218ETS
Alternate Part Numbers:
539 91 90-78, 539919078
Product Specifications
| L&S Part No. | 539 91 90 78 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Husqvarna |
| OEM No. | 539919078 |
| Unit of Sale | 1 |
| Applications | R111 B, R111 B Rider, R111 B5, R111 B5 Rider, R111B, R111B5, R112 C, R112 C Rider, R112 C5, R112 C5 Rider, R112C, R112C5, R115 B, R115 B Rider, R115 C, R115 C Rider, R115B, R115C, RC 318T, RC 318T Rider, RC 320Ts AWD, RC 320Ts AWD Rider, RC318T, RC320TsAWD, W3212A, W3213A, W3213P, W3612A, W3613A, W3613P, W3614A, W4814A, W4815A, WG3213P, WG3613E, WG3613P, WG4815E, WG4815P, WH3614, WH4817EFQ, WH5219EFQ, WH5221EFQ, WHF4215ETS, WHF4818ETS, WHF5218ETS |
| Machine Type | Lawn Mowers |
| Fits Brands | Husqvarna |
| Fits Models | W3212A | W3213A | W3213P | W3612A | W3613A | W3613P | W3614A | W4814A | W4815A | WG3213P | WG3613E | WG3613P | WG4815E | WG4815P | WH3614 | WH4817EFQ | WH5221EFQ | R111 B Rider | R111 B5 Rider | R112 C Rider | R112 C5 Rider | R115 B Rider | R115 C Rider | RC 318T Rider | RC 320Ts AWD Rider | WH5219EFQ | WHF4215ETS | WHF4818ETS | WHF5218ETS |
