| 1 | 1 | 501971 | Cat 290 Water Pump Assembly | |
| 1 | 1 | 502973 | Cat 290 Water Pump Only | |
| 1 | 1 | 12428 | Crankcase, 4 Screw-Small Cap | |
| 2 | 2 | 12429 | Stud (M8 X 82) | |
| 3 | 1 | 12430 | O-Ring, Oil Filler Cap | |
| 4 | 1 | 12431 | Oil Filler Cap | |
| 5 | 1 | 12476 | Flat Flex Gasket, Oil Gauge | |
| 6 | 1 | 12433 | Crankcase Cover | |
| 7 | 1 | 12435 | O-Ring, Drain Plug | |
| 8 | 1 | 12436 | Drain Plug | |
| 9 | 1 | 12432 | O-Ring, Crankcase Cover | |
| 10 | 1 | 12434 | Bubble Oil Gauge | |
| 11 | 4 | 12437 | Sems Comb Head Screw (M6 X 20) | |
| 12 | 1 | 12438 | Crankshaft | |
| 13 | 2 | 12439 | Bearing | |
| 14 | 2 | 12440 | Oil Seal | |
| 15 | 2 | 12441 | O-Ring, Oil Seal Case | |
| 16 | 2 | 12442 | Oil Seal Case | |
| 17 | 8 | 12443 | Sems Comb Head Screw (M6 X 16) | |
| 18 | 1 | 12477 | Shaft Protector | |
| 19 | 3 | 12444 | Connecting Rod | |
| 20 | 3 | 12446 | Piston Pin | |
| 21 | 3 | 12445 | Piston Rod | |
| 22 | 3 | 12447 | Seal Washer | |
| 23 | 3 | 12448 | Oil, Seal | |
| 27 | 3 | 12451 | Back-Up Ring, Sleeve | |
| 28 | 3 | 12453 | Seal Washer | |
| 29 | 3 | 12454 | Seal Retainer | |
| 31 | 1 | 12455 | Inlet Manifold | |
| 32 | 3 | 12457 | Inlet Valve | |
| 33 | 3 | 12458 | Bac-Cup Piston | |
| 34 | 3 | 12459 | Bac-Cup Ring | |
| 36 | 3 | 12461 | Piston Spacer | |
| 37 | 3 | 12462 | Piston Retainer | |
| 38 | 3 | 12463 | Conical Washer - SS | |
| 39 | 3 | 12464 | Nut - SS | |
| 42 | 3 | 12466 | Cylinder | |
| 43 | 3 | 12468 | Back-up Ring, Cylinder | |
| 48 | 2 | 12474 | Hex Nut | |
| 49 | 1 | 12469 | Discharge - Manifold | |