The heart of the classic ST Pro™ 495 system is graco 243183 displacement pump—a Chromex-hardened workhorse rated at 3000 psi and 0.54 gpm max delivery. Because it drops into every 232943 Lo-Boy chassis built between 1999-2008, a single spare lower can rescue fleets scattered across multiple crews and counties. Contractors and professionals in Houston, Phoenix, and Pittsburgh count on the 495’s rock-solid motor/pump combo to spray block-fillers one day and fine-finish enamels the next. The key is OEM tolerances: knock-off rods glaze packings in weeks, while Graco’s Chromex rods routinely last 750–1000 spray hours before repack, keep spraying with graco airless sprayer parts.
Five Reasons Pros Pick the 243183 Pump
- Chromex™ Rod & Stainless Sleeve – 6× longer life than economy steel lowers
- Quick-Change Packing Stack – swap V-Max™ Blue seals in under 20 min with QuikPak kits
- Self-Cleaning Prime Valve – Vibra-Seat design purges debris for no-stall startups
- Tool-Free Pump Removal – two hand-knobs release the lower; no hammers, no blown timelines
- Cross-Fleet Hardware – identical outlet threads match graco paint sprayer 395 & graco magnum xr7 parts, so you stock one filter family for all rigs
Key Performance Specs
- Maximum Working Pressure: 3000 psi / 207 bar
- Maximum Flow: 0.54 gpm / 2.05 lpm
- Max Tip Size (1-gun): 0.023 in
- Recommended Hose Length: 150 ft with minimal dead-band
- Motor: ¾ HP UL-listed universal, 120 V – brushes available as kit 236967
Which Machines Does the 243183 Pump Fit?
Direct bolt-on for:
- ST Pro 495 Lo-Boy (232943) & Stand (232940) sprayers
- ST Pro 455 & 395 when upgraded with 243183 kit (threads match drive rod)
- Legacy Ultra Max II 495 PC Pro – flows slightly higher (0.60 gpm) but shares suction & outlet geometry
- Graco paint sprayer 395 – identical Easy-Out™ filter & RAC X™ guard
Cross-Stock Parts for Mixed Fleets
Keep one bin of graco spray pump parts for your 495ST and Magnum XR7 rigs; the valves, outlet fittings, and suction O-rings are common across both platforms. Houston-area refinishers love this because one truck run to our Jones Road service counter covers commercial and DIY rentals in a single purchase.
Shop-Floor Hacks for 10-Year Pump Life
- Log hours, not months — Repack every 750–1000 spray hours; note the change in the graco paint sprayer parts diagram.
- Daily TSL Drip — Add one drop of Throat Seal Lubricant before each shift to cool packings.
- Color-Code Bins — Yellow for belts, red for packings, blue for graco paint sprayer attachments so night shifts grab the right box first-time.
- Carry a Spare Pump — The 243183 lower swaps in under 60 seconds—faster than mixing a second five-gallon pail.
- Flush Hot — End-of-day FastFlush™ mode (4× faster, half the water) from the Ultra Max platform works on ST Pro as well
Bundle & Save Freight
- 17H839 QuikPak™ Kit – one-piece cartridge rebuild for any ST-series pump
- 246215 RAC X™ Blue Guard – universal 7/8-G threads fit 495, 395, Magnum XR7 & TrueCoat guns
- 288818 Magnum XR Pump Kit – keeps rental fleets spraying while pros run ST Pro
- BlueMax II 1/4″ x 50′ Hose – crush-proof braid, static-dissipative per Graco bulletin 334530
All parts qualify for combined-cart shipping—one freight fee, one tracking number.
Ready to Slash Downtime & Boost Margins?
Add the OEM Graco 495ST ProB Lo-Boy Pump 243183 to your cart now and feel the difference when tomorrow’s first trigger pull lays down glass-smooth coverage—no spits, no stalls, just profit.
