The Honda 81521-758-U00 Tensioner Arm is a genuine OEM replacement designed for BK4542 and BK4546 lawn tractors. As a direct Honda OEM component, this part is manufactured to the same standards as the original, ensuring a proper fit in your tractor without modification. Always confirm your model and serial number against the fitment table before ordering.
Key Features
- Genuine Honda OEM Part — sourced directly from Honda, this Tensioner Arm matches the original component in geometry and function, ensuring the belt tension behaves exactly as designed for BK4542 and BK4546 lawn tractors.
- Proper Belt Engagement — a correctly functioning Tensioner Arm maintains consistent pressure on the drive or blade belt; a worn or damaged arm allows the belt to slip, reducing cutting performance and accelerating belt wear.
- Fitment Coverage — compatible with BK4542 and BK4546 lawn tractors; verify your serial number against the fitment table, as Honda supersedes parts at production breaks and serial ranges matter.
The Tensioner Arm is a pivoting component in the belt drive system of a lawn tractor, responsible for maintaining the correct amount of tension on the drive or cutting-deck belt. It keeps the belt firmly seated against the pulleys so power is transferred smoothly and consistently from the engine to the blades or ground drive. When the arm wears, bends, or its pivot point loosens, belt tension drops — leading to slipping, squealing, or complete loss of blade or drive engagement until the arm is replaced.
Part Details
| Part Number | 81521-758-U00 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Tensioner Arm |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Lawn Tractor | BK4542, BK4546 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
