Johnson Gearcase Exploded View Diagram and Parts Fits 20, 25, 30, 35 HP 1984-2002
| Figure # | Description | O.E.M. # | Sierra # | Qty. |
| * | Gearcase Assembly, Complete 15" NA | 434763 | NA | 1 |
| * | Gearcase Assembly, Complete 20" NA | | NA | 1 |
| * | Gearcase Housing Only NA | 434030 | NA | 1 |
| 1 | Washer | 330658 | | 1 |
| 2 | Tube, Water | 395339 | | 1 |
| 3 | Grommet | 302497 | 18-33291 | 1 |
| 4 | Housing, Water Pump | 393632 | 18-33671 | 1 |
| 5 | Tube, Extension | 326692 | | 1 |
| 6 | O-ring | 311338 | 18-71051 2 | 2 |
| 7 | Bolt, Water Pump Housing | 328725 | | 6 |
| 8 | O-ring | 554545 | 18-71461 2 | 1 |
| 9 | Insert, Water Pump Housing | 328751 | 18-33581 | 1 |
| 10 | Impeller | 395289 | 18-30511 | 1 |
| 11 | Key, Water Pump | 344470 | 18-32951 | 1 |
| 12 | Bushing | 328754 | | 1 |
| 13 | O-ring | 301877 | 18-71001 | 1 |
| 14 | Seal, Spaghetti | 328753 | 18-25391 | 1 |
| 15 | Plate, Wear | 328755 | 18-33591 | 1 |
| 16 | Gasket, Water Pump | 325537 | 18-01241 2 | 1 |
| 18 | Seal, Driveshaft (upper) | 332261 | 18-20652 | 1 |
| 17a | Driveshaft- 15" | 341635 | | 1 |
| 17b | Driveshaft- 20" | 341636 | | 1 |
| 19 | Seal, Driveshaft (lower) | 321928 | 18-20332 | 1 |
| 20 | Bearing, Driveshaft | 386473 | | 1 |
| 21 | Collar, Housing | 322018 | | 1 |
| 22 | Bearing, Pinion | 437288 | | 2 |
| 23 | Nut, Housing | 306422 | | 1 |
| 24 | Washer, Locking | 301250 | | 1 |
| 25 | Bushing, Housing Alignment | 319785 | | 1 |
| 26 | Stud | 320173 | | 1 |
| 27 | Connector, Shift | 325624 | | 1 |
| 28 | Shift Rod | 331479 | | 1 |
| 29 | Keeper, Nylon Shift | 325625 | | 2 |
| 30 | Nut, Shiftshaft Retaining | 331465 | | 1 |
| 31 | Bushing | 326361 | | 1 |
| 32 | O-ring | 303347 | 18-71801 | 1 |
| 33 | O-ring | 301877 | 18-71001 | 1 |
| 34 | Washer, Expanding | 321738 | 18-01892 | 1 |
| 35 | Anode Kit | 434029 | | 1 |
| 36 | Lockwasher | 304454 | | 1 |
| 37 | Bolt, Anode Retaining | 333677 | | 1 |
| 38 | Bolt, Trim Tab Retaining | 329217 | | 1 |
| 39 | Trim Tab | 336203 | | 1 |
| 40 | Bolt, Housing Retaining | 328333 | | 4 |
| 41 | Gasket, Drain Plug | 311598 | 18-42482 | 2 |
| 42 | Plug, Drain | 307551 | 18-2387 | 2 |
| 43 | Gasket, Drain Plug | 332584 | 18-74752 | 1 |
| 44 | Pin, Shift Lever Pivot | 308376 | | 1 |
| 45a | Screen, Water Inlet | 336202 | | 1 |
| 45b | Screen, Water Inlet | 336206 | | 1 |
| 46 | Screw, Screen Retaining | 325539 | | 2 |
| 47 | Washer, Thrust | 327716 | | 1 |
| 48 | Bearing, Thrust | 388027 | | 2 |
| 49 | Washer, Thrust | 330441 | | 1 |
| 50 | Gear, Pinion | 328313 | 18-1288 | 1 |
| 51 | Bearing, Forward Gear | 386186 | | 1 |
| *** | Gear Set, Complete (F,P,R) | | 18-1293 | 1 |
| 52 | Gear, Forward | 392475 | 18-1287 | 1 |
| 53 | Clutch, Sliding | 337020 | 18-1290 | 1 |
| 54 | Spring, Detent | 327070 | | 1 |
| 55 | Ball, Detent | 316506 | 18-2243 | 2 |
| 56 | Lever, Shifter | 337019 | | 1 |
| 57 | Cradle, Sliding Clutch | 438311 | | 1 |
| 58 | Pin, Shift | 302504 | | 1 |
| 59 | Cotterpin, Shift Lever | 303049 | | 1 |
| 60 | Assy., Yoke & Connector | 390023 | | 1 |
| 61 | Shaft, Propeller | 439143 | | 1 |
| 62 | Gear, Reverse | 327655 | 18-1289 | 1 |
| 63 | Bushing, Reverse Gear | 319635 | | 1 |
| 64 | Plate, Retainer | 319746 | | 1 |
| 65 | Ring, Retaining | 319747 | | 1 |
| 66 | Washer, Forward Gear Thrust | 319684 | | 1 |
| 67 | Bearing, Propshaft | 437288 | | 2 |
| 68 | O-ring | 338518 | 18-71082 | 1 |
| 69 | Washer, Sealing Ring | 332584 | 18-74752 | 2 |
| 70 | Bolt, Carrier Retaining | 319743 | | 2 |
| 71 | Carrier, Bearing | 433428 | | 1 |
| 72 | Seal, Propshaft | 321453 | 18-20262 | 2 |
| 73 | Spacer, Prop | 335420 | 18-4232 | 1 |
| 74 | Prop Nut & Spacer | 319891 | 18-3707 | 1 |
| 75 | Cotter Pin, Prop Nut | 320785 | 18-3743 | 1 |
| 76 | Gear Housing Seal Kit | 396351 | 18-2658 | 1 |
| 77 | Water Pump Kit | 393630 | 18-3382 | 1 |
| 1 | Contents of Gearcase Seal Kit 18-3382 | | 2 | Contents of Gearcase Seal Kit 18-2658 |
No Review for Drive Shaft Housing O-Ring - Sierra
No Review for Drive Shaft Oil Seal for Johnson/Evinrude 321928, OMC Sterndrive/Cobra, GLM 86200 - Sierra
No Review for Water Pump Impeller Plate Gasket for Johnson/Evinrude 325537, GLM 34520 - Sierra
No Review for Clutch Dog for Johnson/Evinrude - Sierra
No Review for Water Pump Cup for Johnson/Evinrude 328751, GLM 12812 - Sierra
No Review for Propeller Castle Nut - Sierra
No Review for Gearcase O-Ring - Sierra
No Review for Propeller Spacer - Sierra
No Review for Propeller Cotter Pin - Sierra
No Review for Drive Shaft Housing O-Ring - Sierra
No Review for Lower Unit Gearcase O-Ring - Sierra
No Review for Water Pump Impeller Plate for Johnson/Evinrude 328755, GLM 12630 - Sierra
No Review for Water Pump Repair Kit with Housing for Johnson/Evinrude 393630, GLM 12070 - Sierra
No Review for Gearcase O-Ring for Johnson/Evinrude 313893, GLM 81460 81450 - Sierra
No Review for Pinion Gear for Johnson/Evinrude 328313 - Sierra
No Review for Detent Ball for Johnson/Evinrude 316506, GLM 22490 - Sierra
No Review for Forward Gear & Bushing for Johnson/Evinrude 392475 - Sierra
No Review for Water Pump Impeller Key for Johnson/Evinrude 330619, GLM 89593 - Sierra
No Review for Water Pump Housing for Johnson/Evinrude 393632, GLM 12470 - Sierra
No Review for Water Pump Impeller Housing Rubber Seal for Johnson/Evinrude 328753, GLM 86230 - Sierra
No Review for Propeller Drive Shaft Oil Seal - Sierra
No Review for Reverse Gear for Johnson/Evinrude 327655 - Sierra
No Review for Gear Set for Johnson/Evinrude - Sierra
No Review for Mallory Rubber Seal 9-78009
No Review for Mallory O-Ring 9-76571
No Review for Mallory O-Ring 9-76556
No Review for Mallory O-Ring 9-76539
No Review for Mallory O-Ring 9-76522
No Review for Mallory O-Ring 9-76509
No Review for Mallory O-Ring 9-76506
No Review for Mallory Oil Seal 9-76214
No Review for Mallory Oil Seal 9-76211
No Review for Mallory Oil Seal 9-76203
No Review for Mallory Seal Kit, Gear Housing 9-74101
No Review for Mallory Plug, Lower Unit Drain 9-72655
No Review for Mallory Gasket, Drain Plug 9-60408
No Review for Mallory Impeller 9-45200
No Review for Mallory Grommet 9-43603
No Review for Mallory Cup, Water pump 9-43504
No Review for Mallory Wear Plate w/gasket 9-43405
No Review for Mallory Housing, Water Pump 9-43205
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