Pump packing typically requires replacement every 500–1,000 spray hours, depending on fluid type, pressure, and ambient temperature. Hydraulic fluids wear seals faster than latex or acrylics. If you notice fluid leaking around the pump rod or loss of pressure hold, it's time to replace the Graco 18B260 Pump Packing Repair Kit.

The packing kit (18B260) seals the pump rod and prevents internal leakage. The ball-and-seat kit (246429) is a check valve that allows one-way flow during pressurization. Both wear out independently. Ball-and-seat failure causes pressure loss and backflow; packing failure causes rod sealing leaks. Many rebuild jobs require both kits.

The Graco 246386 Suction Hose Kit fits 390, 395, 490, 595, and 695 models. However, confirm your exact model and inlet fitting size before ordering. Cross-model compatibility exists but is not universal. Verify part number against your equipment manual or call our technical team to avoid mismatches.

Sudden pressure drop typically indicates ball-and-seat valve failure (246429 kit), worn pump packing (18B260), or a blocked drain hose. Start by inspecting the drain hose (246381) for clogs, then test pressure hold with the trigger locked. If pressure bleeds off, the ball-and-seat check valve is likely defective.

All parts in this collection are authentic Graco OEM components with manufacturer warranty. Counterfeit Graco kits flood the market and fail prematurely. Purchasing from authorized distributors like Pittsburgh Spray Equipment ensures authenticity, warranty coverage, and technical support.