Homelite UP03874 Woodruff Key – Genuine OEM Replacement Engine Key

Part Number: UP03874
Category: Chainsaw & Leaf Blower Engine, Flywheel & Crankshaft Parts
Type: Woodruff Key – Genuine OEM Replacement Engine Key

The Homelite UP03874 Woodruff Key is a genuine OEM replacement engine component designed for select Homelite chainsaws, leaf blowers, and blower/vacuum equipment. Installed within the engine assembly, the Woodruff key fits into the applicable crankshaft keyway and helps maintain proper positioning between the crankshaft and mating rotating component.

Product Specifications

• Part Number: UP03874
• Manufacturer: Homelite
• Product Type: Woodruff Key
• OEM Description: Key, Woodruff / Woodruff Key
• Component Type: Engine Shaft Key
• Function: Locates & Secures the Applicable Rotating Component on the Crankshaft
• System: Engine / Crankshaft / Flywheel Assembly
• Application: Chainsaw / Leaf Blower / Blower Vacuum
• Compatible Brand: Homelite
• Component Location: Engine Crankshaft Assembly
• Approximate Size: 0.3" W x 0.3" D x 0.3" H
• Superseding Reference: 69250
• Replacement Type: Direct OEM Replacement
• OEM Status: Genuine Homelite OEM Part
• Condition: New
• Quantity Used: 1 per confirmed engine assembly

Factory documentation for the Homelite Z3350B UT-10759 Chainsaw identifies UP03874 as item 18, Woodruff Key, with one required per engine assembly.

Features & Benefits

• Genuine Homelite OEM replacement engine component
• Factory-designated Woodruff Key
• Designed for compatible Homelite chainsaws and leaf blowers
• Installs within the applicable crankshaft keyway
• Helps properly locate the mating rotating component on the crankshaft
• Supports proper factory alignment of applicable engine components
• Designed to match the original equipment configuration
• Helps restore an engine with a damaged or sheared key
• Suitable for engine, crankshaft, and flywheel service
• Used across numerous Homelite chainsaw and blower platforms
• Ideal replacement for sheared, worn, rounded, distorted, damaged, corroded, or missing Woodruff keys
• Direct replacement for equipment requiring part number UP03874

Applications

Documented applications include select:

• Homelite 20AV Chainsaw
• Homelite 25AV Chainsaw
• Homelite B2014 Chainsaw
• Homelite B2316 Chainsaw
• Homelite B2718 Chainsaw
• Homelite B2720 Chainsaw
• Homelite D3300 / D3300C Chainsaws
• Homelite D3350B / D3350BC Chainsaws
• Homelite D3800 / D3800C Chainsaws
• Homelite D3850B / D3850BC Chainsaws
• Homelite D4150B Chainsaw
• Homelite D4550B / D4550BC Chainsaws
• Homelite BP250 / BP250I Backpack Blowers
• Homelite BP30185 Blower
• Homelite BVM160 Blower/Vacuum
• Homelite BX90 Blower
• Homelite D25B Blower
• Homelite D25MHV Blower
• Homelite D30MHA / D30MHV Blowers
• Homelite HB100 / HB180 Blowers
• Select additional Homelite chainsaws and blower/vacuum models
• OEM replacement applications requiring UP03874

Compatibility listings confirm UP03874 across numerous Homelite chainsaw and blower platforms, while factory diagrams confirm its use within internal engine assemblies.

Important Notes

• Verify compatibility with your specific Homelite equipment model, UT number, serial number, engine configuration, and production revision before ordering.
• Homelite OEM suppliers identify UP03874 specifically as “WOODRUFF KEY.”
• Factory parts documentation also identifies the component as “Key, Woodruff.”
• UP03874 is used across both Homelite chainsaws and leaf blower/vacuum equipment.
• Factory documentation for the Z3350B UT-10759 Chainsaw identifies UP03874 as item 18 within the internal engine and oil pump assembly and specifies one key per assembly.
• Factory documentation for the HB30160 Blower UT-08070-AR also identifies UP03874 as the Woodruff Key within both applicable 25cc and 30cc engine configurations.
• The HB390VI UT-08027-D engine parts documentation likewise specifies one UP03874 Woodruff Key in applicable 25cc and 30cc short-block configurations.
• Some parts suppliers identify 69250 as a superseding replacement reference for UP03874.
• Do not confuse the Woodruff key with a retaining key, shaft pin, cotter pin, crankshaft, flywheel, washer, or other engine hardware.
• A sheared Woodruff key may indicate that the applicable rotating component has shifted or that another engine issue is present. Inspect related components before reassembly.
• Inspect the crankshaft keyway and mating component for wear, deformation, cracking, scoring, or other damage when replacing the key.
• Do not reuse a Woodruff key that is sheared, rounded, excessively worn, distorted, or otherwise damaged.
• Ensure the replacement key is fully seated in the crankshaft keyway before reinstalling the mating component.
• Follow applicable manufacturer torque specifications and service procedures when reinstalling flywheel or crankshaft-related components.
• This listing is for one Homelite UP03874 Woodruff Key only unless otherwise specified. Crankshafts, flywheels, washers, bearings, seals, fasteners, and other engine components are sold separately.
• Match part number UP03874 with your equipment's illustrated parts diagram or OEM documentation before ordering to ensure proper fitment.