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Aftermarket replacement transmission oil pump for Caterpillar 416 to 438 backhoe loaders. It replaces Caterpillar part number 6Y-3864 / 9W-5426: the oil pump listed by Caterpillar as part number 6Y-3864.
Fits Caterpillar 416, 416B, 426, 426B, 428, 428B, 436 and 438 backhoe loaders. It is built to the same mounting, wiring and connector layout as the part it replaces, so it fits in place of the old one without changes to the machine.
Check the part number on the label of the old unit, or in the parts manual for your machine's serial number range, before ordering. Sold as a single unit, shipped worldwide.
| Part Type | Transmission Oil Pump |
| Replaces | Caterpillar 6Y-3864 / 9W-5426 |
| Fits | Caterpillar 416, 416B, 426, 426B, 428, 428B, 436 and 438 backhoe loaders |
| Condition | New, aftermarket |
| Stat. HS-Code | 841360 |
Caterpillar machines and engines
Check the part number on your old unit before ordering.
| Pack | Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|---|
| 1 Piece | 6Y-3864 / 9W-5426(SPM-HEP-2410) | Caterpillar 416, 416B, 426, 426B, 428, 428B, 436 and 438 backhoe loaders |
Machine slow to drive or will not move
A worn transmission charge pump cannot hold clutch pressure: the machine creeps, slips or will not drive when warm.
Whining from the gearbox
A pump that whines or growls under load is worn or drawing air through a blocked suction strainer.
Gearbox rebuilds
Fit a new pump whenever the transmission is rebuilt so worn gears do not undo the repair.
Fitting tips
Clean the strainer, fit a new seal and O ring, refill with the specified oil and check the pressure before work.
Found this part cheaper elsewhere? Send us the listing and we will beat it under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Our price of USD 115.98 is 20 to 27% less than the aftermarket prices we compared it with:
| eBay, aftermarket seller | USD 144.98 (checked 4 Oct 2026) |
| Holdwell, aftermarket | USD 148.00 (checked 4 Oct 2026) |
| eBay, aftermarket seller | USD 159.28 (checked 4 Oct 2026) |
No. It is an aftermarket part made to fit in place of Caterpillar 6Y-3864 / 9W-5426. It is not made by or affiliated with Caterpillar; the Caterpillar part number is used only to show what it replaces.
It fits Caterpillar 416, 416B, 426, 426B, 428, 428B, 436 and 438 backhoe loaders. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It is made to the same mounting and connections as the original part. Fit new gaskets and seals where they are used, and check for leaks and correct operation before putting the machine back to work.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
