The Graco 255528 Kit, Throat, L250CS is a genuine replacement throat seal kit designed for maintaining L250CS Check-Mate 250 cc Carbon Steel Severe Duty pumps. This kit contains the critical throat packing components that help maintain a proper seal around the displacement rod, reducing leakage and ensuring reliable pump performance in demanding industrial applications.
Compatible Machines
The Graco 255528 Throat Kit fits equipment and systems equipped with an L250CS Check-Mate 250 cc Carbon Steel Severe Duty Lower Pump, including:
- Graco Check-Mate 250 cc Pump Assemblies utilizing the L250CS lower pump
- Industrial Supply Systems with L250CS lower pumps
- Ram-Mounted Adhesive Dispensing Systems using L250CS pumps
- Sealant Supply and Transfer Systems equipped with L250CS pumps
- Bulk Material Pumping Systems utilizing Check-Mate 250 cc L250CS lowers
- Industrial Extrusion and Material Transfer Packages built with L250CS pump assemblies
Important: Compatibility is determined by the installed lower pump model. This throat seal kit is specifically designed for L250CS lower pumps and is not intended for L250SS, L250CM, or L250SM variants.
Kit Components
The Graco 255528 Kit, Throat, L250CS includes the packing and sealing components required to service the throat section of the pump:
- UHMWPE V-Packings
- PTFE V-Packings
- Female Packing Gland
- Male Packing Gland
- Associated O-Rings and Sealing Components
Applications
This throat repair kit is commonly used during preventative maintenance and pump rebuild procedures. Replacing worn throat packings helps maintain pump efficiency, minimize material leakage, and extend the service life of the lower pump assembly.
Compatible Lower Pump Reference
| Lower Pump Model | Compatible Throat Kit |
| L250CS | 255528 |
| L250SS | 255529 |
| L250CM | 255530 |
| L250SM | 255530 |
Benefits of Replacing Worn Throat Packings
- Helps prevent material leakage around the displacement rod
- Maintains consistent pump pressure and performance
- Reduces unplanned downtime and maintenance costs
- Supports longer service life of pump components
- Restores sealing integrity in demanding industrial environments
Technical Information
| Part Number | 255528 |
| Product Type | Throat Seal Repair Kit |
| Designed For | L250CS Check-Mate 250 cc Lower Pump |
| Material Configuration | Carbon Steel Severe Duty Pump Applications |
| Manufacturer | Graco |
Frequently Asked Questions
The Graco 255528 Kit, Throat, L250CS is used to replace worn throat packing components in L250CS Check-Mate lower pumps, helping maintain proper sealing and pump performance.
This kit is specifically designed for the L250CS Check-Mate 250 cc Carbon Steel Severe Duty lower pump.
No. The 255528 kit is intended only for L250CS lower pumps. Other L250 variants require different throat seal kits.
Throat packings should be inspected regularly and replaced when leakage, wear, pressure loss, or reduced pump performance is observed.
