Graco 101545 Cotter Pin

Overview & Compatibility for Graco 101545 Cotter Pin

Compatible Machines / Assemblies

• Graco 223596 Monark Pump (23:1) — uses cotter pin in old-style ball-check assembly.
• Graco 237958 Monark SST Pump (23:1) — same application.
• Graco 239140 President SST Pump (46:1) — listed for old-style ball-check version.

Product Description

Graco 101545 Cotter Pin (sometimes written as 101-545) is an OEM locking fastener used to secure pump/tie-rod or clevis connections in select Graco displacement pump assemblies. It prevents loosening and misalignment under repeated high-pressure cycling.

Key Features

• Genuine OEM replacement part for select Graco pumps.
• Simple, reliable mechanical lock for rods/links within the pump module.
• Corrosion-resistant construction for long service life.
• Lightweight hardware that’s easy to keep in a rebuild kit.

Fitment Notes

• Use only where the official parts diagram specifies 101545 (older “ball-check” pump styles commonly).
• If your diagram references a different pin (e.g., another part number), do not substitute.
• When installing, insert through the drilled hole and bend ends per Graco service procedure.

Specifications

Maintenance Tips

• Replace any bent, fatigued, or corroded cotter pins during pump service.
• Always verify orientation and fully secure the legs after insertion.
• Re-check after initial run-in; vibration should not back the joint out.

Frequently Asked Questions