The Bedford 20-3229 is a direct-fit replacement for the Graco 144-500 major service kit, designed for complete rebuild and maintenance of PowrTwin and PowrLiner airless spray pumps. This comprehensive kit equips spray equipment technicians, pump rebuild specialists, and professional painting contractors with the essential internal components needed to restore pump performance after extended service or wear.

Major service kits like this one contain the full complement of packings, seals, O-rings, check balls, and other wear items that deteriorate during normal pump operation. When assembled correctly, these kits return a tired or degraded pump to OEM performance standards without requiring replacement of the entire pump housing or frame.

Common reasons for replacement:

• Pressure drops below specification despite prime and fluid checks, indicating internal seal or packing failure
• Excessive fluid leakage from pump rod or bearing surfaces during operation
• Erratic spray pattern or pressure fluctuation caused by worn internal check valves or ball seats
• Scheduled preventive maintenance on high-use rental or contractor equipment to avoid downtime

Manufactured to OEM-equivalent dimensions for proper fit and performance. Compatible Graco equipment models are listed in the Compatible Equipment section below, where available.