The Honda 78107-YB4-K10 Volute Case is a genuine OEM replacement built for WB30 and WD30 water pumps. Sourced directly from Honda, this part matches the original specification exactly, ensuring a proper fit without rework or modification. It is designed for the WB30 and WD30 centrifugal water pumps and restores the pump housing to correct operating condition.
Key Features
- Genuine OEM Housing Geometry — as the structural core of the pump's fluid passage, the volute must maintain precise internal contour to sustain flow and pressure; this Honda OEM part delivers that accuracy where an ill-fitting replacement cannot.
- Direct OEM Replacement — engineered to replace the original volute case on WB30 and WD30 water pumps, restoring the pump housing to its designed operating condition.
- Verify Your Serial Number — Honda updates parts at production serial breaks; confirm your pump's serial number against the fitment table before ordering to ensure this is the correct case for your unit.
- Sustained Pump Output — a cracked, worn, or damaged volute disrupts the pressure envelope around the impeller, causing a drop in flow rate and discharge head; a sound volute case keeps the pump performing at rated capacity.
The volute case is the spiral-shaped housing that surrounds the impeller in a centrifugal water pump. As the impeller spins, it flings water outward, and the gradually widening volute channel converts that velocity into pressure, directing flow toward the discharge port. When the volute case cracks or deteriorates — through impact, cavitation damage, or age — the pump loses the ability to build pressure efficiently, resulting in reduced flow and output. Replacing a damaged case with a genuine Honda part restores the correct internal geometry and gets the pump back to full performance.
Part Details
| Part Number | 78107-YB4-K10 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Volute Case |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WB30, WD30 | 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.
