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Graco 104489 Woodruff Key

Graco 104489 Woodruff Key is a durable OEM replacement designed for precise torque transfer and secure shaft-to-hub connection in Graco machines.

  • Part No: 104489
  • Size: 1/8″ × 1/2″ Flat Bottom
  • OEM Graco Replacement Part
  • Ensures stable fit and long service life
  • Used in Graco pumps and spray systems

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Component Details: Key Woodruff 104489 (1/8″ × 1/2″ Flat Bottom)

The Key Woodruff – part 104489 is a precision-machined OEM half-moon key with a flat-bottom profile, designed for secure torque transmission in select Graco rotating assemblies. Its flat-bottom design provides reliable seating and consistent engagement under load.

Compatible Machines

  • Graco air-spray pump series (models referencing 104489 in parts lists)
  • Graco fluid transfer and lubrication systems using the 1/8″ × 1/2″ flat-bottom key
  • Graco high-cycle finishing equipment where woodruff key part 104489 is specified

Key Specifications & Features

Part Number 104489
Key Type Woodruff Key – 1/8″ (width) × 1/2″ (top length), flat-bottom profile
Main Function Transmits rotational force between shaft and hub; prevents slippage under load
Design Feature Flat-bottom seat for stable engagement and minimal play in high-precision assemblies
Typical Use Case Industrial spray pumps, high-performance fluid systems, OEM replacements

Why This Key Matters

  • Precision fit: Ensures accurate seating and engagement—critical for high-speed or high-load rotating systems.
  • Reliable torque transfer: Helps prevent hub-to-shaft motion, extending equipment life and reducing maintenance.
  • OEM standard: Matches Graco part 104489 exactly—avoids incorrect substitutes and ensures parts compatibility.

Installation & Maintenance Tips

For optimal performance, follow these best practices:

  1. Ensure the shaft keyway and hub slot are clean and free from debris before installation.
  2. Seat the flat-bottom Woodruff key fully in the shaft keyslot; align hub carefully before assembly to avoid damage.
  3. Check for correct fit and minimal play—replace the key if you see wear, rounding of edges, or movement in the seat.
  4. During scheduled maintenance, inspect for signs of torque-slip, vibration or misalignment; replacing part 104489 immediately can prevent downstream failure.

Frequently Asked Questions

While dimensionally the key (1/8″ × 1/2″ flat-bottom) may fit other equipment, it is specified by Graco for their assemblies. Always verify keyseat size, thickness and hub-slot compatibility before substitution.

Inspection frequency depends on load, speed and use. As a rule, check the key each time the hub is removed. Replace immediately if you notice rounding of edges, play in the hub or repeated slippage.

Incorrect installation—such as improper seating, reversed orientation, or mismatch with hub slot—can lead to hub slippage, wobble, excessive vibration and premature component wear. Precision installation is essential.

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