Stop fighting downtime and start spraying profitably. OEM Graco 455 ST Pro Lo-Boy Pump (part 243183) restores the heart of your mid-class airless rig in under five minutes, giving decorators, remodelers, and industrial maintenance teams the same factory-tight seal tolerances that shipped with every Series-A sprayer back in the day. Built around stainless-steel wetted components and Chromex™-hardened piston technology, this fluid section delivers up to 0.44 GPM at 0–3000 psi, plenty for a .021 tip running continuous latex or a finer .015 tip pushing solvent-based enamel.
Why Pros Trust the 243183 Pump Over Aftermarket Copycats
- Exact-fit geometry means zero shim-grinding, zero adaptor-plates—just drop it in, pin it, prime, and spray.
- Matched Chromex rod & V-packings slash abrasion, so seal kits last up to 30 % longer than generic steel rods.
- Factory hydro-test to 20 % over the 3000 psi working pressure ensures every cylinder and seat leaves leak-free.
- Backed by Graco warranty.
- Future-proof upgrade path: if you later jump to the 246426 displacement pump, dimensions match for a true plug-and-play swap.
Compatible Graco Sprayers & Retrofit Opportunities
Graco 243183 displacement pump was factory-installed on all 455 ST Pro Lo-Boy and Hi-Boy carts (models 232931 & 232932) plus the standard 455 stand mount. It also shares mounting and stroke geometry with several sister frames: 295 ST, 395 ST Pro, and 495 ST Pro lines—stand, Lo-Boy, and Hi-Boy variants listed under service manual 309057.
Installations we see daily in our tech bay:
- 455 ST Pro Lo-Boy (workhorse for residential repaint crews)
- 395 ST Pro cart (light commercial vinyl-acrylic jobs)
- 495 ST Pro Hi-Boy (dual-gun setups on new-build exteriors)
- Legacy LineLazer 3000 and Ultra 600 rigs after bracket shim—ask chat for the two-bolt conversion guide.
Technical Specs at a Glance
Output: 0–3000 psi (0–210 bar) adjustable | Flow: 0.44 GPM (1.66 LPM) | Recommended Tip: up to .021 with latex | Wetted Parts: Stainless steel, carbon steel, PTFE & leather packings | Cycles/Gallon: ≈620 | Factory Seal Kit: 235703 leather/PE combo (fits 390 ST through 495 ST).
How a Fresh Pump Pays for Itself in a Week
A worn pump loses pressure, creating tailing and over-atomization that wastes paint and forces double-coats. Swap in the 243183 and watch the pressure needle lock steady: no surging motor, no wandering fan pattern, and up to 18 % faster coverage on interior primers. Many contractors recoup the part cost in a single 3-bedroom repaint through saved labour and reduced material discard.
Maintenance, Repair Kits & Attachments—Everything in One Cart
Preventative care is simple: flush after every shift, log hours, and rebuild with a 235703 repair kit every 200-250 spray hours. We stock the full graco repair kits line, including piston rods, balls, and O-rings, plus graco sprayer tips from .009 to .027 fan widths for fine-finish lacquers up to heavy elastomerics. Need to tackle knock-down texture? Pair your refreshed pump with graco texture guns and RAC X 519 or 531 tips. Looking for cordless convenience on trim punch-outs? Our shelves are also loaded with graco cordless paint sprayer parts and the latest graco paint sprayer attachments—filters, extensions, guards—to keep every tool in your fleet battle-ready. Because many paint shops run mixed fleets, we’ve tightened our logistics chain to support crossover models like graco 3900 paint sprayer parts series, graco gmax 5900 gas rigs, and even consumer stalwarts drawn from the graco truecoat 360 parts list. One PO covers it all, trimming admin time and freight costs.
Ready to Get Spraying?
In stock Add the Graco 455 ST Pro Lo-Boy Pump 243183 to your cart right now. so you can be spraying again tomorrow.
