The Honda 78122-YB9-003 Adjusting Shim is a genuine OEM component designed for WT20 and WT30 water pumps. As a Honda OEM part, this shim is manufactured to the exact dimensional tolerances specified for these pumps, ensuring correct internal clearance where it matters most. Honda supersedes parts at defined serial breaks, so confirm your pump's serial number against the fitment table before ordering to make sure part number 78122-YB9-003 is the right shim for your unit.
Key Features
- Genuine OEM Dimensional Accuracy — manufactured to Honda's exact thickness specification, giving the pump the precise internal clearance its design requires rather than an approximation
- Direct OEM Replacement — drops in as a like-for-like replacement for the original shim with no alteration needed
- Fits WT20 and WT30 Water Pumps — sourced directly from Honda's parts catalogue for these two centrifugal water pump models
- Serial Number Verification Recommended — Honda updates shim specifications at production breaks, so check your pump's serial number against the compatibility table to confirm this is the correct shim for your machine
An adjusting shim is a precisely manufactured flat spacer used to set or restore a specified clearance or preload within an assembly. In a centrifugal water pump such as the WT20 and WT30, shims control the running clearance between rotating and stationary components, keeping internal tolerances within the range needed for efficient water movement. When the original shim is lost, damaged, or the wrong thickness, clearances fall outside spec — reducing pump output and accelerating wear on surrounding components.
Part Details
| Part Number | 78122-YB9-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Adjusting Shim |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WT20, WT30 | 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.
