Graco 287557 Pump Cylinder Repair Kit

The Graco 287557 Pump Cylinder Repair Kit restores optimal pressure performance and seal integrity in HydraMax sprayers. Ideal for maintenance and extending equipment life.

Fits: HydraMax 300 & HydraMax 350
Part Type: Pump Cylinder Repair Kit
Use: Rebuilds fluid section with OEM-grade seals and packings
Ensures: Reliable pressure and leak-free operation

List Price: $2330

You save: $652.4 (28.00%)

Sale Price: $1677.6

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Description

Compatibility & Product Details for Graco 287557

Graco HydraMax 300
Graco HydraMax 350

At-a-Glance

Part Number	287557
Item Type	Pump Cylinder Repair Kit (fluid end / displacement pump service kit)
System Family	HydraMax heavy-duty airless sprayers
Primary Use	Rebuild/refresh the pump cylinder to restore performance and seal integrity
Contents (typical)	OEM cylinder service components (e.g., seals/packings and wear parts as supplied by Graco; contents may vary by revision)
Compatibility Reminder	Always verify in your machine’s manual by part number 287557 and model/serial range.

Product Overview

The Graco 287557 Pump Cylinder Repair Kit is an OEM service kit for restoring the fluid-end cylinder section of select HydraMax sprayers. Replacing worn packings and related wear components helps maintain prime, reduce by-pass and leaks, and protect the displacement rod and cylinder for consistent, high-pressure performance.

OEM-grade parts engineered for proper fit and service life
Targets the cylinder/packing area where wear most affects pressure and finish quality
Helps reduce downtime versus full pump replacement
Best paired with clean fluids, correct filters, and routine maintenance

Installation Tips (General)

Relieve pressure fully and disconnect power per safety procedures.
Disassemble the fluid section; note packing orientation during teardown.
Clean mating surfaces; replace worn seals/packings from the kit.
Reassemble to specified torque; prime with compatible fluid and test for leaks.

Frequently Asked Questions

Yes—this kit is listed for the HydraMax 300 and HydraMax 350. Always confirm against your sprayer’s manual and serial range before purchase.

The pump cylinder repair kit services the fluid-end wear components (e.g., packings/seals). A complete pump includes the entire displacement assembly and is typically used when major components are damaged beyond service.

Basic hand tools, correct size wrenches, and a torque wrench are recommended. Packing installation tools can help seat seals without damage. Follow Graco’s service manual for your model.

Loss of pressure, hard priming, visible fluid leaks at the fluid section, or pulsation/uneven pattern often indicate worn packings or cylinder wear that a Pump Cylinder Repair Kit can address.

OEM kits typically follow standard parts policies. Because fit is model-specific, verify 287557 against your sprayer manual; opened/used kits may be non-returnable. Check store policy before ordering.