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Graco 101859 Bearing Ball

Graco 101859 Bearing Ball is a genuine OEM stainless steel piston ball used in Graco Dura-Flo pump lowers for smooth, reliable operation. Ideal for maintaining proper pressure and seal integrity.

  • OEM Part: 101859
  • Material: Stainless Steel (3/4 in / 19 mm)
  • Used In: Dura-Flo 900 & compatible pump lowers
  • Function: Ensures precise piston movement & pressure retention

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Overview & Key Details for Graco 101859

Compatible Machines

This Bearing Ball appears in specific Graco Dura-Flo pump lowers. Always verify against your machine’s parts manual or tag before ordering.

  • Graco Dura-Flo 900 (220 cc) Lower — listed as piston ball in applicable parts manual.
  • Other Graco Dura-Flo lowers where the parts diagram specifies 101859 as the piston/ball (often noted as 3/4 in / 19 mm sst). Please confirm by model & serial.

Product Overview

The Graco 101859 Bearing Ball is a genuine OEM component used in select pump lower assemblies to ensure precise sealing/rolling action and long-life performance. Using authentic Graco parts helps maintain rated pressure, reduce wear, and preserve warranty compliance.

Specifications

OEM Part Number 101859
Item Type Bearing Ball / Piston Ball
Typical Location Pump lower assembly (piston/ball seat area)
Material / Size (as noted in manuals) Stainless steel (sst) — commonly referenced as 3/4 in (19 mm) in applicable Dura-Flo lowers
Compatibility Guidance Match exactly to your model’s parts list; do not substitute sizes/materials

When to Replace

  • Loss of prime, pressure fluctuations, or visible ball/seat wear
  • After pump rebuilds or when contamination has occurred

Installation Notes

  • Clean all mating parts; inspect seat for pitting or grooving
  • Install the Bearing Ball with correct orientation per manual
  • Use OEM seats/seals; re-torque to spec; test for prime and leaks

Frequently Asked Questions

Check your sprayer’s parts manual or the pump lower’s exploded diagram. If the list specifically calls out 101859 for the piston/ball, it’s the correct part. If a different size/material is specified, order that exact number instead.

No. This listing is for the Bearing Ball only. Seats, seals, retainers, and other hardware are sold separately unless explicitly stated otherwise on the product page bundle.

No. Using an incorrect size or material can cause sealing issues, pressure loss, and premature wear. Always match the exact Graco part number specified for your model.

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