The Graco 255556 Kit, Piston, L500 (All) is a genuine repair and maintenance kit designed for Check-Mate® L500 displacement pumps. This kit contains the critical piston sealing and wear components required to restore pump efficiency, maintain pressure performance, and reduce downtime caused by worn internal parts.
Compatible Machines
The Graco 255556 Piston Seal Metal and Soft Kit is compatible with the following Check-Mate L500 lower pump assemblies:
- L500CS – Carbon Steel Severe Duty Pump
- L500CM – Carbon Steel MaxLife Pump
- L500SS – Stainless Steel Severe Duty Pump
- L500SM – Stainless Steel MaxLife Pump
Common Equipment Using L500 Pumps
These L500 pump assemblies are commonly installed in a variety of industrial Graco systems, including:
- Check-Mate 500 cc supply pumps
- Bulk material transfer systems
- Industrial dispensing equipment
- Adhesive pumping systems
- Sealant application systems
- High-volume fluid handling packages
- Extrusion and material supply units
Kit Components
The kit includes replacement piston sealing and wear parts designed to help maintain proper pump operation and extend service life.
| Component | Quantity |
| Bearing, Piston Guide CM500 | 1 |
| Acetal Seals | 3 |
| Piston Seal | 1 |
| Piston Seat | 1 |
| Valve Seat Housing | 1 |
Key Features
- Genuine Graco replacement piston repair kit
- Designed specifically for Check-Mate L500 pumps
- Restores piston sealing performance and pressure consistency
- Helps reduce leakage and internal wear
- Supports preventive maintenance programs
- Suitable for severe-duty industrial pumping applications
Frequently Asked Questions
The Graco 255556 Kit, Piston, L500 (All) is used to rebuild and maintain the piston section of Check-Mate L500 displacement pumps, helping restore sealing performance and operational efficiency.
This kit fits L500CS, L500CM, L500SS, and L500SM Check-Mate L500 pump models.
Yes. The kit includes the primary piston sealing and wear components required for servicing the piston assembly of compatible L500 pumps.
Replacing worn piston components helps maintain pressure output, improves sealing efficiency, reduces leakage, and extends overall pump service life.
