Compatibility & Fit – Graco 189316 Displacement Rod
Use the list below to quickly confirm whether the Graco 189316 Displacement Rod matches your pump series. Always verify by lower pump section and ratio.
- Roof Rig GH 5030 (pump assembly)
- Senator / Dura-Flo 900 series – 17:1 ratio
- Bulldog series – 28:1 ratio
- King series – 56:1 ratio
- NXT Dura-Flo series – X16:1 and X30:1 ratios
Part Details
| Part Number | 189316 |
| Item Name | Displacement Rod (also called piston rod) |
| Material | Stainless steel |
| Application | Industrial air-motor/gear-driven displacement pumps (lower pump section) |
| Function | Transfers motion from the drive to the piston/valve assembly; draws in material on the up-stroke and discharges on the down-stroke |
| Fit Guidance | Match by series, ratio, and lower-end bill of materials; check your manual before ordering |
Overview
The Graco 189316 Displacement Rod is a wear component in the pump’s lower section. Because it operates under load with reciprocating seals/packings, it can wear or score over time. Replacing a damaged rod restores sealing, output consistency, and pump life.
When to Replace
- Visible scoring, pitting, or bending on the rod
- Frequent packing leaks or poor prime/pressure stability
- Full lower-end rebuild (recommended to inspect/replace the rod with packings and seats)
Installation Tips (General)
- Confirm part number against your pump’s manual and ratio
- Inspect cylinder and packings; replace worn components together
- Lubricate per manufacturer guidance and torque fasteners to spec
- Flush and pressure-test before returning to service
Frequently Asked Questions
Check the pump series, ratio (e.g., 17:1, 28:1, 56:1, X16:1, X30:1), and the lower-end parts list in your owner’s/service manual. Match the displacement rod number exactly before ordering.
In these pump lowers, the terms are often used interchangeably. The part links the drive to the piston/ball assembly and works with packings to create suction and discharge.
Scored/bent rod, packing leaks, loss of pressure, hard priming, or pulsation under steady load all point to lower-end wear that may include the rod.
It’s good practice to service the full lower (packings, seats/balls, and rod) together. This restores sealing and extends service intervals.
Only if the sprayer’s pump lower is one of the listed series/ratios and the manual specifies 189316. Always confirm by part number in the documentation for your exact unit.
