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Graco 101917 Ball Bearing 7/8 Dia. 304Ss

The Graco 101917 Ball Bearing (7/8″ Dia., 304 SS) is a durable stainless-steel check ball used in Graco transfer pump lower assemblies for reliable sealing and suction performance.

  • Material: 304 Stainless Steel
  • Diameter: 7/8″ (0.875 in)
  • Fits: Graco T1 & T3 Transfer Pumps (Series B lower)
  • Function: One-way check ball for consistent pump priming and flow control

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Technical Overview & Compatibility

Compatible Machines

This OEM check-ball is used in the lower valve assembly of select Graco transfer pumps.

  • Graco T1 Transfer Pump — Series B lower section
  • Graco T3 Transfer Pump — Series B lower section
  • Other Graco transfer pumps that specify a 7/8″ 304SS check ball in the parts manual (verify by model/serial)

What this part is

The Graco 101917 (Ball Bearing, 7/8″ Dia., 304SS) is the precision check-ball used in the pump’s lower valve/seat assembly. In operation, it seals one direction of flow to maintain prime, suction, and smooth cycling. Constructed from 304 stainless steel for strength and corrosion resistance in typical coatings transfer applications.

Key Specifications

OEM Part No. 101917
Common Name Ball Bearing / Check Ball
Diameter 7/8″ (0.875 in)
Material 304SS (304 Stainless Steel)
Typical Location Lower valve/seat assembly (Series B transfer pump lower)
Primary Platforms Graco T1, Graco T3 (verify model & series)
Function One-way sealing for suction/prime retention and consistent pump cycling

When to use/replace

  • Loss of prime, poor suction, or backflow in the lower pump section
  • Visible pitting/flat spots on the ball or wear on the mating seat
  • Irregular or noisy cycling indicating poor sealing at the check-ball

Service notes

  • Relieve system pressure before servicing; follow your Graco manual.
  • Inspect the ball seat and seals; replace worn components together for best results.
  • Clean mating surfaces; keep debris away from the valve during reassembly.
  • Confirm Series B configuration and 7/8″ ball size for your exact model.

Frequently Asked Questions

It acts as a one-way valve element. When seated properly against the valve seat, the 7/8″ 304SS ball prevents backflow, preserving suction/prime and stabilizing the pump’s stroke consistency.

Check your pump’s parts diagram for the lower valve assembly. Look for a 7/8″ ball listed as 101917 and ensure your pump is a Series B configuration (common on T1/T3 transfer pumps).

Yes. 304 stainless steel offers excellent corrosion resistance and durability for typical coatings transfer environments, while maintaining precise roundness for a positive seal on the seat.

Loss of prime, cavitation, inconsistent cycling, or visible wear/flat spots on the ball. Replace the ball and inspect the seat and seals at the same time.

Yes. Inspect the ball seat, O-rings, and lower-valve seals. Replacing these together can restore sealing performance and extend service intervals.

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