Graco 236786 Pump Cylinder Kit
$182.29
$247.00
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The Graco 236786 Pump Cylinder Kit is a genuine OEM fluid-section cylinder designed to restore smooth performance and seal integrity in select Graco 390 and NOVA sprayers.
- Ensures precise fit and factory-grade performance
- Replaces worn or damaged pump cylinder
- Compatible with 390 ST/STS, NOVA SP/SPX, and Pro 301 ST series
- Helps eliminate leakage and pressure loss
Quantity
Genuine OEM Part
Fast Shipping (Order by 1 PM CST)
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Overview & Key Details
The Graco 236786 Pump Cylinder Kit (also written as 236-786) is the OEM fluid-section cylinder used on select Graco 390-class and NOVA-series airless sprayers. Replacing a worn cylinder helps restore sealing surface quality for packings/rod, improving pressure stability and reducing leaks.
Compatible Machines
Fits the following Graco/related models (verify with your sprayer’s parts manual):
- NOVA SP
- NOVA SPX (old version)
- Pro 301ST (Fuller O’Brien)
- Pro 301STS (Fuller O’Brien)
- PRO 501ST (Fuller O’Brien)
- 390 Duron (a.k.a. 390 Performance/Duron)
- 390 ST
- 390 STS
- 290 Easy (select variants)
Part Details
| OEM Part | Graco 236786 Pump Cylinder Kit |
|---|---|
| Also Known As | 236-786 |
| Assembly Note | Often referenced with pump assembly #236787 (check your model’s breakdown). |
| Function | Fluid-section cylinder that houses the rod/packings in the airless pump. |
| Category | Airless sprayer pump cylinder / fluid-section component |
| Genuine/OEM | Yes — OEM Graco replacement part |
Why Replace the Cylinder?
- Restores a smooth, in-tolerance sealing surface for packings/rod.
- Helps recover pressure consistency and reduce bypass/leakage.
- Extends service life of Graco 390-class and NOVA pumps when combined with fresh packings.
What’s Typically Involved
- De-pressurize and flush the unit per Graco’s safety procedure.
- Remove the fluid section; inspect rod/packings and check valve parts.
- Install the new pump cylinder, then rebuild with correct packings/torque per manual.
- Prime with solvent/paint, check for leaks, and verify pressure/atomization.
Notes & Cross-References
| Common Series | Graco 390 ST / STS, 390 Duron, NOVA SP/SPX, Pro/PRO ST variants |
|---|---|
| Related Pump Assy | Often noted with Pump #236787 (verify per model breakdown) |
| Best Practice | Replace packings and check ball/seat if wear is evident when installing a new cylinder. |
Frequently Asked Questions
Yes. It’s the same Graco part; some listings include the hyphen (236-786) and others don’t (236786).
It is commonly listed for NOVA SP, NOVA SPX (old), Pro 301ST/301STS (Fuller O’Brien), PRO 501ST, and Graco 390 series including 390 Duron, 390 ST, and 390 STS, plus select 290 Easy variants. Always verify with your exact parts manual before purchase.
It’s best practice to inspect and often replace the packings, seals, and check components during a cylinder swap. Follow your model’s service manual for the correct kit numbers and torque specs.
Yes — it’s a genuine Graco pump cylinder for the listed sprayer families when specified in their parts lists.
Symptoms include difficulty holding pressure, visible scoring or wear, accelerated packing wear, or persistent leakage at the rod. If present, replacing the Graco 236786 Pump Cylinder Kit with fresh packings typically restores performance.
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