Reference
Pump Identification
Identify your pump’s key components and part numbers. Use the exploded diagram and reference chart below to determine the correct repair parts for your 2″ or 3″ NAPCO rotary gear pump.
NAPCO Pump Component Reference
| Description | Part Number | Ref. No. | Qty / Pump |
|---|---|---|---|
| 3″ Pump | |||
| 3″ Pump | PA300C or PA300S | ||
| 3″ Service Kit | PK300C or PK300S | ||
| Idler Shaft | PM304C or PM304S | 4 | 1 |
| Drive Shaft | PM303C or PM303S | 3 | 1 |
| Pump Housing 3″ | PM0301C or PM0301S | 1 | 1 |
| Driver Gear 3″ | PM306N | 9 | 1 |
| Idler Gear 3″ | PM306N | 9 | 1 |
| Port Bolt | 5/8-11 x 1.5″ Hex Bolt C or S | 16 | 4 |
| Port Gasket | PB316 | 14 | 2 |
| 2″ Pump | |||
| 2″ Pump | PA200C or PA200S | ||
| 2″ Service Kit | PK200C or PK200S | ||
| Idler Shaft | PM204C or PM204S | 4 | 1 |
| Drive Shaft | PM203C or PM203S | 3 | 1 |
| Pump Housing 2″ | PM0201C or PM0201S | 1 | |
| Driver Gear 2″ | PM206N | 9 | 1 |
| Idler Gear 2″ | PM206N | 9 | 1 |
| Port Bolt | 5/8-11 x 1.5″ Hex Bolt C or S | 16 | 4 |
| Port Gasket | PB216 | 14 | 2 |
| Common Parts | |||
| Bearing Housing / Side Cover | PM002C or PM002S | 2 | 2 |
| Set Screw | NAP-1/4-2.8 × .5 SNSS | 5 | 2 |
| Gasket .016″ | PM007G02 | 7 | 4 |
| Gasket .008″ | PM007G01 | 7 | 3 |
| Roller Bearing | PM038 | 8 | 4 |
| Seal – Low Pressure | PM037 | 10 | 4 |
| Seal – High Pressure | PM036 | 11 | 4 |
| Side Cover Bolt | 3/8-16 × 1.25″ Hex Bolt C or S | 17 | 24 |
| Grease Nipple (SS) | H1610S | 18 | 8 |
| Aligning Pin | PM42 | 19 | 2 |
| O-Ring | PB43 | 25 | 4 |
| Backing Washer | PM226 | 27 | 4 |
Next Steps
Once you’ve identified your pump model, use the links below to find the correct repair kit, review maintenance procedures, or view engineering specifications.