A failing crankshaft creates chatter, pulsation, and premature seal wear throughout your sprayer’s drive train. Swap the heart of the mechanism in minutes with the genuine graco repair kit engineered specifically for the GMAX 3400 platform. Each package includes a hardened crankshaft, matched bearings, and factory-torqued fasteners—arriving ready to slide into your housing with no machining or shimming required. Installing this OEM set eliminates vibration, restores smooth piston travel, and cuts motor load, so you spray longer between service intervals. Because the components are balanced to Graco’s exact tolerances, the finished repair delivers the same silky fan pattern you enjoyed on day one. Upgrade once, and your rig will tackle primers, elastomerics, and heavy industrial coatings without a hiccup. Keep downtime minimal and productivity high—choose the graco crankshaft solution trusted by professional contractors worldwide.
Inside any piston-style airless sprayer, the crankshaft converts motor rotation into linear piston movement. Over thousands of cycles, grit infiltration and lubricant breakdown erode bearing races and scoring surfaces. Performance symptoms escalate—pressure creeps, stroke noise increases, and packings wear at twice their normal rate. Installing the purpose-built gmax 3400 crank assembly halts wear progression at the source, restoring the precise geometric alignment needed for consistent output.
Most technicians report a 30-minute turnaround—far quicker than chasing individual bearings at a machine shop.
Treat the crankshaft upgrade as the cornerstone of your graco sprayer maintenance program. Pair the swap with fresh oil, a new suction filter, and a clean manifold screen to give every moving part a clean slate.
Although optimized for the GMAX 3400 Standard Series, the kit also fits some older 3300-level frames sharing the same housing casting. Standardizing on one repair SKU simplifies truck inventory and ensures crews always carry the right parts.
“Our 3400 went from rattling like a jackhammer to whisper-quiet in half an hour. Pressure held rock-steady all day.”
— Leo P., Commercial Exterior Lead
“Bearing kits alone never lasted. This complete shaft finally solved the vibration that killed our packings.”
— Jen S., Facility Maintenance Supervisor
Copycat shafts may save a few dollars but often miss hardening depth and bearing preload targets, leading to early failure and voided warranties. Protect your investment and jobsite reputation with genuine graco parts that meet UL safety and ISO hardness standards.
• Install a new connecting-rod assembly if rod-end play exceeds spec.
• Replace pump packings once the shaft sits true to lock in a leak-free seal.
• Flush drive housing with solvent and refill with manufacturer-approved oil for maximum bearing life.
Click “Add to Cart,” select expedited shipping, and keep an extra kit on the truck. When the next shaft wears out mid-project, you’ll be back up and coating before the competition unloads their ladders.
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