Fiat 5129478 / Fiat 640: tractor hydraulic gear pump replacement reference
Reference 5129478 corresponds to the Fiat 640 identification in this pump table. It has an 11 ml/rev displacement, 160 bar maximum and left-hand rotation. Compare it with 5179722: capacity and hole sizes match, but the catalogue explicitly prints the opposite rotation for the 480 reference.
Trace the correct reference
When an original unit has been changed before, the tractor badge can be misleading. Use the physical unit carrying 5129478 and its drive-end photograph as the starting point.
No specific tractor serial ranges are established here for 5129478 / Fiat 640. Use the parts manual and existing hardware to complete the application check.
Technical specifications
| Reference / model | 5129478 / Fiat 640 |
|---|---|
| Product type | Tractor Hydraulic Gear Pump |
| Original reference numbers | 5129478 |
| Applicable tractor models | Confirm from original pump / equipment parts list |
| Manufacturer reference | FIAT 640 |
| Nominal displacement | 11.0 ml/rev |
| Maximum pressure | 160 bar |
| Rotational speed | 500–3200 rpm |
| Controlled flow rate | 16.0 L/min |
| Feed hole / connection | Ø20 |
| Discharge hole / connection | Ø13.6 |
| Rotation | anticlockwise (CCW) |
Hose connection checks
Even a correct cross-reference can fail if the drive turns the wrong way. The 5129478 / Fiat 640 listing indicates counterclockwise, so trace the machine’s drive direction before use.
Ø20 and Ø13.6 are the recorded feed/discharge connection values. A mistaken swap between inlet and pressure ports should be resolved on the bench.
Drive rotationCCW
Displacement11.0 ml/rev
Connection checkØ20 / Ø13.6
Capacity under machine load
For the stated 11.0 ml/rev pump, the hydraulic system remains the limiting context. Mechanical fit alone is not a test of working flow or acceptable drive load.
Within the comparison set, 5179722 / Fiat 480 lists 11.0 ml/rev and 160 bar. That is a useful limit check for the 5129478 / Fiat 640 hydraulic request, not permission to alter the tractor’s original pump rating.
In addition to displacement, the table provides 16.0 L/min controlled flow. This is a separate selection datum and needs its own confirmation in the machine.
The stated speed is 500–3200 rpm. Before commissioning, verify the engine accessory drive ratio and that normal operating conditions do not exceed this listing.
Preventing a repeat failure
Inspect the hydraulic reservoir and filter when changing to 5129478 / Fiat 640. Recording the original failure symptoms and checking a blocked feed line may prevent an immediate second failure.
An incorrectly seated shaft coupling may damage both drive and pump even at light load.
Close relatives are not identical
Consider Fiat 5179722 / Fiat 480 only as a reference to compare: it is designated CW and has 11.0 ml/rev. 5129478 / Fiat 640 is designated CCW, so any departure in direction or shaft style must be resolved.
A supplier can review alternatives after the damaged part is identified by its original drawing or measurements.
RFQ information that avoids rework
For 5129478 / Fiat 640, the most useful RFQ attachments are a shaft-end image, a drawing of the fastening pattern and the existing hose connector specification.
Replacement evaluations can proceed faster when photographs show all sides rather than only the top cover.
What buyers ask about this model
Can different oil fittings be made to work with 5129478 / Fiat 640?
Only after confirming the actual port thread or bore, sealing system and clearance. Do not assume an adapter makes a mechanically wrong pump correct.
Why must the port sizes for 5129478 / Fiat 640 be measured?
The listed supply/discharge values (Ø20 and Ø13.6) do not describe the full gasket, thread seat or bolt pattern.
Ordering, samples and shipping terms
Order quantities are set according to pump type and total order value. A small order of 1–2 pieces can be considered at a higher unit price; new customers may request 1–5 samples when the item is suitable. Mixed-model orders are available, normally with a combined order value of approximately USD 1,500.
Typical production schedules are 10–25 working days for standard items, 20–45 working days for customized components, and 45–120 working days for project equipment. Usual delivery terms are EXW, FOB, CIF and DAP. FCA, CFR, CPT, CIP and DDP can be discussed for specific shipments. Confirm the final schedule and terms with the quotation.
Third-party brand names and trademarks are used only for product identification and cross-reference. They remain the property of their respective owners; such references do not imply affiliation, sponsorship, authorization or endorsement.
Request a quotation for this pump
Send the old pump reference, quantity, photos and interface measurements to our sales team.
sales@netherlandsdrive.com