Overview & Key Details
The Graco 102861 Packing O-Ring (also referenced as 102-861) is a sealing component used in select Graco fluid-handling and spray systems to help maintain pressure and prevent leaks around critical fluid path interfaces.
Compatible Machines
- Graco Monark Hydra-Clean 5:1 pump assemblies (where 102861/102-861 appears in the parts list)
- Selected Graco transfer / proportioning pumps that specify 102861 as an O-ring packing
- Various industrial fluid-handling & spray models where the parts manual calls out 102861
Technical Details
| Part Number | 102861 (a.k.a. 102-861) |
| Type | O-Ring Packing — fluid seal |
| Typical Use | Seals in pump/manifold or other fluid-path interfaces to help maintain pressure and prevent leaks |
| Material (noted in some manuals) | Often listed as Viton® in certain assemblies; confirm against your model’s parts list |
| Also Note | Check equipment manual for exact location, size, and orientation during assembly |
Product Description
The Graco 102861 Packing O-Ring is a precision seal used to support reliable operation in select Graco pumps and spray systems. A well-fitted O-Ring helps minimize bypass, supports consistent pressure, and reduces premature wear on surrounding parts. For the best result, inspect mating surfaces, lightly lubricate per the service manual, and torque hardware to specification during reassembly.
Fitment & Verification
- Match the exact part number: 102861/102-861
- Confirm the O-ring’s material and dimensions in your machine’s parts manual
- Replace in sets when the service procedure recommends it (to maintain sealing integrity)
- If your unit is older, cross-check by serial/revision in the official parts breakdown
Frequently Asked Questions
Check your model’s parts manual or exploded view and look for 102861 (or 102-861) in the bill of materials. If listed, it’s the correct replacement. Model-year and revision can affect fitment, so verify by serial when available.
Some assemblies list Viton®, but materials can vary by application. Always follow your manual’s specification to ensure chemical compatibility and service life.
Clean and inspect grooves and mating surfaces, replace worn components, use the lubricant specified in the service manual, and torque fasteners evenly. After reassembly, pressure-test per the manual to verify sealing.
Size alone isn’t sufficient—material, hardness, and chemical resistance matter. Use OEM-specified parts or proven equivalents that match material/durometer and are rated for your fluids and pressures.
Pressure loss, visible fluid weeping at the joint, cavitation, or inconsistent spray pattern can indicate a worn or damaged O-Ring. Inspect during scheduled maintenance or whenever you service the pump section.
