The Honda 78107-YG2-023 Volute Case is a genuine OEM replacement designed for the WT40 water pump. As the primary housing that surrounds the impeller, this component is at the heart of how the pump converts rotating energy into flow — and Honda's OEM specification ensures it restores correct hydraulic geometry when the original has cracked, worn, or corroded. Confirm part number 78107-YG2-023 against your pump's serial number and parts diagram before ordering to ensure this is the right volute case for your unit.
Key Features
- Genuine OEM Hydraulic Integrity — manufactured to Honda's exact internal profile dimensions, so the impeller runs at the correct clearance and the pump delivers its rated flow and pressure output.
- Direct OEM Replacement — sourced directly from Honda and built to the same specification as the original, this volute case drops into the WT40 pump without rework or adaptation.
- WT40 Water Pump Fitment — confirmed for the Honda WT40; verify your serial number against the fitment table to ensure this case corresponds to your production run.
- Restores Full Pump Output — a cracked or eroded volute disrupts the pressure gradient inside the pump, causing flow loss and cavitation; replacing it with this OEM case brings the pump back to rated performance.
The volute case is the spiral-shaped chamber that surrounds the impeller in a centrifugal water pump. As the impeller spins, the volute's gradually widening passage collects water thrown outward by centrifugal force and converts its velocity into pressure before it exits through the discharge port. When the volute cracks, pits, or wears — often from abrasive debris or prolonged use — the pump loses its ability to build pressure efficiently, flow rates drop, and the pump may run hot or cavitate. Replacing the volute case on the WT40 with a genuine Honda part restores the precise internal geometry the pump needs to move water at its full rated capacity.
Part Details
| Part Number | 78107-YG2-023 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Volute Case |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WT40 | 1105132-9999999 |
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.
