Kit Contents:
- 1 Drive Gear Assembly – PA250S
- 1 Idler Gear Assembly – PA251S
- 4 Roller Bearings – PM038
- 4 High Pressure Seals – PM036
- 4 Low Pressure Seals – PM037
- 2 Center Case Gaskets (.016″) – PM007G01
- 3 Center Case Gaskets (.008″) – PM007G02
Why Rebuild Instead of Replace?
NAPCO rotary gear pumps are engineered for field serviceability. Rather than replacing an entire pump when wear occurs, a PK200S rebuild kit restores the PA200S to factory performance at a fraction of the cost. Rebuilds can be completed on-site with standard tools, minimizing downtime. Stainless steel gears maintain corrosion resistance through multiple rebuild cycles. Typical rebuild time is 2–4 hours. Read our rebuild vs. replacement cost analysis for a detailed economic comparison.
When to Rebuild
- Reduced flow at normal operating pressure — worn gear teeth no longer seal against the casing
- Increased vibration or unusual noise during operation
- Visible fluid leakage past seals at the shaft or case joints
- Higher motor amperage draw at the same RPM and pressure
- Declining output accuracy during delivery
What's Inside the Kit
The drive and idler gear assemblies (PA250S/PA251S) are factory-matched and must be replaced as a set to maintain proper mesh clearance. Stainless steel construction provides corrosion resistance for chemical processing, food-grade, and caustic fluid applications. Four roller bearings (PM038) support both gear shafts. High-pressure seals (PM036) and low-pressure seals (PM037) prevent leakage at pressures up to 100 PSI. Center case gaskets (two .016″, three .008″) complete the seal package.
Stainless Steel Advantages
The PK200S stainless steel gears are required for corrosive chemicals, food-contact fluids, pharmaceutical ingredients, and any application where iron contamination is unacceptable. Stainless resists oxidation and pitting from acids, caustics, and chloride-containing solutions. For food & beverage applications involving syrups, oils, and flavorings, see our food processing pump selection guide. For non-corrosive applications like petroleum, adhesives, or general industrial fluids, the PK200C ductile iron kit offers an economical alternative with equivalent performance.
Related Resources
Compatible Pump:
PA200S – 2″ Stainless Steel Pump →Alternative Material:
PK200C – 2″ Ductile Iron Kit →Resources:
Field Maintenance Guide →Repair Procedures →