The Honda 90521-750-000 Differential Pinion Washer A (16.2X30X0.7) is a genuine OEM component designed for H5013, H5518, H6522, HT3810, HT3813, HT4213, and RT5000 tractors. As an authentic Honda part, this washer is manufactured to the exact dimensions and tolerances Honda specifies for these machines. Confirm your tractor's serial number against the fitment table before ordering — Honda supersedes parts at serial breaks, and the correct washer for your unit depends on where your serial falls.
Key Features
- Genuine OEM Dimensional Accuracy — at 16.2 x 30 x 0.7 mm, this washer matches the exact specification Honda requires for the differential pinion on these tractors; an incorrect thickness or diameter affects how load is distributed across the assembly
- Direct OEM Replacement — sourced directly from Honda, part number 90521-750-000 drops in without modification, preserving the original differential geometry
- Broad Tractor Fitment — covers H5013, H5518, and H6522 multi-purpose and compact tractors, as well as HT3810, HT3813, and HT4213 lawn tractors and the RT5000 multi-purpose tractor
- Serial Number Verification Recommended — Honda updates part supersessions at specific serial breaks; cross-check your machine's serial number against the fitment table to confirm this is the right washer for your unit
The Differential Pinion Washer A sits within the differential assembly of these Honda tractors, where it controls axial spacing and manages the load bearing across the pinion gear. Maintaining the correct washer thickness is essential to keeping the differential operating within its designed tolerances — too little or too much clearance can cause uneven gear wear or poor traction performance. When this washer wears down or is damaged, replacing it with the correct OEM part restores proper differential function and protects the surrounding components from accelerated wear.
Part Details
| Part Number | 90521-750-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Differential Pinion Washer A (16.2X30X0.7) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Compact Tractor | H6522 | All |
| Lawn Tractor | HT3810, HT3813, HT4213 | All |
| Multi-Purpose Tractor | H5013, H5518, RT5000 | 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.
