OEM / REF: RE525511SKU: pilotpart438276
Engine Overhaul Kit RE525511 for John Deere 4440 Tractor 6404D Engine is a Overhaul Kits replacement part indexed for John Deere 6600 · 6404 and John Deere 7700 · 6404, with 3 application records on file. Match OEM part number RE525511 and confirm fitment for John Deere Engine Spare Parts before ordering.
This Overhaul Kits is indexed for John Deere 6600 · 6404; John Deere 7700 · 6404; John Deere 4000 · 6404; John Deere 4020 · 6404. Compare reference number RE525511 against the label on your existing John Deere component before ordering.
Additional cross references on file: R49470, R49650, R59850. If your machine plate shows a different number, submit a fitment inquiry with photos before checkout.
| Engine Notes | 1.500" Piston Pin Diameter, Naturally Aspirated |
|---|---|
| Piston Pin Dia. | 1.500" |
| Engine CID | 404 |
| Fuel Type | Diesel |
| Cylinder Count | 6 |
| Bore | 4.250" |
| Stroke Length | 4.750" |
| Rod Journal Dimensions | 2.9980" - 2.9990" |
| Main Journal Dimensions | 3.3715" - 3.3725" |
| Part Number | RE525511, R49470, R49650, R59850, R72128, R87558, R26047, R52225, R58880, R69923, RG27842, FP404DLOHK, RG27841, RG23429 |
Match the OEM or reference number first, then verify machine model, engine model, serial number, connector layout, mounting points, and old part photos.
Yes. Send the old part number, machine plate, and photos through the fitment inquiry form. Support can review possible replacements or alternatives.
Products are indexed as replacement parts unless explicitly marked otherwise. Always compare reference numbers and confirm fitment before purchase.
