The John Deere 300 engine line groups 2 variant designations. Parts and fitment are pooled here so a cross-reference found on one variant surfaces for the whole family.
| Part # | Description | Category |
|---|---|---|
| 193A104 | Element, Water Temp. | sensor |
| 193A108 | Element, Oil Pressure | sensor |
| 309A179 | Switch, Water Hi-Temp. | sensor |
| 309B10 | Switch, Low Oil Pressure | sensor |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.