Graco 17D123 Pump Cylinder - What It Is & What It Fits
Compatible Machines
- Graco GH 230 ProContractor
- Model 24W932 — GH 230 ProContractor, Convertible
- Model 24W933 — GH 230 ProContractor w/ Electric Motor Kit
- Model 24W934 — GH 230 ProContractor w/ Electric Motor Kit (CSA)
- Graco GH 300 ProContractor
- Model 24W936 — GH 300 ProContractor
Also used in the GH 230 / GH 300 fluid pump assembly 24W998.
Overview
Graco 17D123 Pump Cylinder is an OEM fluid-end cylinder used in select Graco gasoline hydraulic sprayers. It houses the piston/packing stack in the pump’s fluid section, ensuring smooth, consistent priming and pressure for airless spraying. Choosing genuine Graco parts protects performance, maintains sealing integrity, and helps minimize premature wear.
OEM Part: 17D123
Key Benefits
- OEM precision: Built to Graco tolerances for proper piston alignment and sealing.
- Durable construction: Designed for high-pressure, high-duty jobsite use.
- Consistent output: Helps maintain steady spray pressure and reliable priming.
- Direct fit: Drop-in replacement for listed GH 230 / GH 300 models.
Quick Reference
| Part Number | 17D123 |
| Category | Pump Fluid Section | Pump Cylinder |
| Primary Fit | GH 230 ProContractor (24W932, 24W933, 24W934) & GH 300 ProContractor (24W936) |
| Related Assembly | Fluid Pump 24W998 (GH 230 / GH 300) |
When should I replace the cylinder?
- Visible scoring/galling inside the bore
- Chronic pressure loss or poor priming after a fresh packing swap
- Unusual wear on piston/packings suggesting misalignment or damaged bore
Installation & Care Tips
- Clean all mating surfaces; inspect piston rod and packings for wear.
- Use compatible lubricant on packings during reassembly.
- Torque fasteners to spec per your unit’s service manual.
- Flush with appropriate solvent after use to reduce internal wear.
Frequently Asked Questions
If your unit is GH 230 ProContractor (24W932, 24W933, 24W934) or GH 300 ProContractor (24W936), this is the correct OEM cylinder. Check your sprayer’s model decal and parts list to confirm before ordering.
Look for pressure drop, inconsistent spray fan, difficult priming, or visible scoring in the bore. If these occur even after fresh packings, the cylinder may be worn and due for replacement.
It’s strongly recommended. Installing new packings with a new cylinder helps restore factory sealing and extends service life. Inspect the piston rod and valves while you’re in there.
Note: Always verify compatibility with your exact model and serial range using the sprayer’s parts manual before purchase.
