Graco 287834 Displacement Pump

The Graco 287834 Displacement Pump is a heavy-duty lower pump assembly designed for high-output hydraulic sprayers like the GH 833. Built for durability and consistent performance under demanding coatings applications.

Part Number: 287834
Fits: Graco GH 833 Big Rig Hydraulic Sprayer
Pressure Rating: Up to 4000 PSI
Flow Capacity: Approx. 4 GPM (machine-dependent)
Purpose: Replacement lower pump for high-volume airless spraying

List Price: $2830

You save: $452.8 (16.00%)

Sale Price: $2377.2

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Description

Overview: Graco 287834 Displacement Pump

Compatible Machines

This lower pump assembly fits the following Graco “Big Rig” hydraulic sprayer(s). Always confirm by model & serial against your parts manual.

Graco GH 833 Gas Hydraulic “Big Rig” Sprayer (all variants that specify 287834 as the displacement pump/lower)

Key Features & Benefits

OEM lower assembly engineered for proper fit/seal and long service life.
High-volume design suitable for heavy coatings and long hose runs (machine-dependent).
Serviceable fluid stack—packings and checks can be rebuilt following Graco procedures.
Direct replacement for units calling out 287834 in their parts manual.

Technical Details

Part Number	287834
Assembly Type	Displacement Pump (Lower Pump Assembly / Fluid Section)
Typical System Ratings*	Up to 4,000 psi and ~4.0 gpm when used in GH 833 systems (verify your unit’s specification plate/manual).
Common Components	Fluid cylinder, piston/rod, packings, intake & outlet checks (exact contents per Graco bill of materials).
Applications	High-production airless spraying of paints, primers, heavy coatings (machine- and tip-size-dependent).

What’s Included

287834 factory-assembled lower pump (displacement pump) ready to mount to the powerhead per Graco procedure.

Fitment Notes

Match the part number in your GH 833 parts manual before purchasing.
If your unit calls for a different lower (e.g., different porting or ratio), order that specific part.
After installation, pressure-test and check for leaks; use only Graco-approved fluids and lubricants.

Frequently Asked Questions

Check your sprayer’s parts manual and the model/serial plate. If the manual lists 287834 Displacement Pump (or “lower pump assembly”) for your configuration, it’s the correct replacement. When in doubt, provide your model & serial for verification.

Yes. The fluid stack (packings/checks) is serviceable following Graco procedures. However, if the cylinder/rod is worn or scored, replacing the complete displacement pump often restores performance faster and more reliably than piecemeal repairs.

Capabilities depend on the sprayer it’s installed on. In GH 833 systems, the sprayer is rated up to 4,000 psi and about 4.0 gpm. Always follow the ratings on your equipment plate and in your Graco manual.

Persistent pressure loss, pulsation, leakage past packings, slow priming, or visible rod/cylinder wear are common indicators. Verify hose/tip/filters first, then inspect the lower per Graco service steps.

Relieve pressure, flush/clean, and follow torque specs and sealing practices in the Graco repair manual. After installation, prime with compatible fluid, check for leaks, and verify pressure control with a clean filter and the correct tip size.