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Graco 103649 Packing O-Ring

OEM Graco 103649 Packing O-Ring for sealing the pump/lower assembly—helps maintain pressure and stop leaks. Verify by parts list before ordering.

  • OEM fit and reliability
  • Seals fluid path to prevent leakage
  • Stabilizes pressure & spray pattern
  • Used in select Graco pump/lowers
  • Match your manual to 103649

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Overview & Key Details

The Graco P/N 103649 is an OEM Packing O-Ring used to seal fluid passages within pump/lower assemblies on select Graco airless sprayers. Proper sealing helps maintain pressure, reduce bypass, and prevent leakage for consistent spray performance.

Compatible Machines

Verified model-specific compatibility for 103649 is not publicly enumerated by Graco. This Packing O-Ring appears in pump/lower seal stacks used across multiple Graco airless sprayer platforms. Please confirm against your unit’s parts manual or pump/lower BOM before ordering.

  • Used in Graco airless sprayer pump/lower assemblies (model-dependent; verify by parts list).
How to confirm fitment:
  • Locate your sprayer’s exact model and series (e.g., “Ultra/Ultra Max II/Mark/GMAX”).
  • Open its Graco parts list and check the pump/lower diagram.
  • Match the seal stack item number to 103649 before purchase.

Quick Specifications

Part Number 103649
Item Type Packing O-Ring (seal)
Brand Graco (OEM)
Application Pump/lower seal stack; helps maintain pressure and prevent fluid leakage.
Material OEM elastomer (exact compound varies by application; refer to equipment manual).
Typical Symptoms of Wear Loss of prime, pressure drop, visible leaks, pulsation, or inconsistent spray pattern.

Why This Part Matters

  • Maintains proper fluid sealing in the pump for steady pressure.
  • Reduces risk of leaks that can cause downtime or coating defects.
  • OEM Graco component for reliable fit and durability (when correctly specified).

Installation & Care Tips

  • Always depressurize and clean the pump before service.
  • Inspect the seal groove and mating surfaces; remove debris and replace any damaged components.
  • Use a light compatible lubricant on the Packing O-Ring during installation to avoid nicks.
  • Prime and test for leaks; monitor pressure and spray pattern after reassembly.

Frequently Asked Questions

Check your sprayer’s official parts list or pump/lower bill of materials. If the seal stack calls out 103649, this is the correct Packing O-Ring. Model families can share parts, but verification by manual is essential.

Using non-OEM seals can affect chemical compatibility, hardness, and life. For best results, use genuine Graco parts or exact-spec equivalents. Incorrect cross-section or durometer can cause leaks or premature wear.

Loss of prime, pressure fluctuations, visible fluid leakage, or a poor/unstable spray pattern often indicate worn seals. Inspect the entire seal stack; replace related packings if they show wear.

Usually only standard hand tools and the model’s service instructions are required. Avoid sharp picks that can nick the elastomer. Use a compatible assembly lubricant to ease installation.

Visit the official Graco support site and search your exact model to download the manual and parts list. Cross-reference the pump/lower seal stack item number with 103649 to confirm compatibility.

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