Description
Product Details
| Seal Kit | 3750740 |
| Cylinder Part Number | 4550419 (existing listing; confirm against the machine serial-specific CAT parts diagram) |
| Brand | CAT |
| Cylinder Type / Application | Rod Seal Kit — CAT identifies 375-0740 for the 306D Stick Cylinder application. |
| Rod Diameter | 55 mm (2.17 in), per CAT |
| Product Type | Hydraulic Cylinder Rod Seal Kit |
| CAT-Compatible Models | Mini Hydraulic Excavators: 305.5 GC, 306E, 306, 305.5E2 |
| Kit Components Listed by CAT | Lip-type seal (1), retaining rings (2), O-rings (2), seal assembly (1), buffer ring (1), bearing (1), backup ring (1). |
| Fitment Verification | CAT recommends confirming the part against the machine configuration and serial-specific parts diagram. |
Source: CAT Parts Store — 375-0740. The empty Bore Diameter row has been removed; CAT does not publish a nominal bore for this kit on the cited page.