Fiat 640 Tractor Hydraulic Gear Pump Replacement – 640BH

GBC-FIAT-640BH — Fiat 640 Tractor Hydraulic Gear Pump Replacement – 640BH

The Fiat 640 platform used two hydraulic pump variants across its production run, differing in displacement and port configuration. The BH-series pump, fitted to certain 640 models, has a smaller displacement of 11.0 ml/r compared with the 13.0 ml/r SH-series, and uses metric M18×1.5 and M16×1.5 threaded ports rather than the UNF feed port of the SH variant. Correct identification of the BH versus SH variant is essential before ordering — measure the existing pump displacement and confirm the port thread type to ensure an exact replacement.

The GBC-FIAT-640BH is a direct-replacement external gear pump for the Fiat 640 BH-series configuration. Specification: 11.0 ml/r displacement, 160 bar rated pressure, clockwise (right-hand) shaft rotation, M18×1.5 feed port, M16×1.5 discharge port. It installs without modification in place of the original BH-series pump. For the full GBC tractor pump range, visit the GBC homepage.

MOQ: flexible. Minimum order value USD 1,500; mixed orders and trial quantities welcome.

OEM Reference Numbers and Fitment

Distinguish the BH-series from the SH-series by port thread: BH has M18×1.5 feed and M16×1.5 discharge (both metric); SH has 5/8-18 UNF feed and M14×1.5 discharge. The BH-series pump also has 11.0 ml/r displacement versus 13.0 ml/r for the SH. If your existing pump matches these BH characteristics with clockwise rotation, GBC-FIAT-640BH is the correct replacement. Contact us to confirm fitment.

Technical Specifications

BH-Series vs SH-Series: Choosing the Right Pump

Fiat supplied the 640 with different hydraulic pump variants depending on market, export specification, and production period. The two most common variants are the SH (13.0 ml/r, UNF/M14 ports) and the BH (11.0 ml/r, M18/M16 ports). These pumps are NOT interchangeable — different port sizes and different output volumes. Fitting the wrong variant will result in either incorrect flow or the need to re-plumb the hydraulic connections.

Always measure or confirm the original pump before ordering. Key checks: (1) port thread size — M18 for BH versus 5/8 UNF for SH at the feed port; (2) displacement — if you have access to a test bench or the pump nameplate, confirm 11 ml/r or 13 ml/r; (3) rotation direction — clockwise for 640BH. If in doubt, contact our technical team before ordering.

Installation Notes

Installation procedure for the GBC-FIAT-640BH follows the same steps as other Fiat 640 pump replacements. Isolate and drain the hydraulic system, remove the old pump, clean the mounting face, and fit the new unit with a fresh gasket or O-ring. Reconnect the M18×1.5 feed hose and M16×1.5 discharge hose, torque mounting bolts, prime the pump with clean oil, and run at low idle to bleed air. Replace the hydraulic filter during the same service interval.

GBC-FIAT-640BH is supplied with protective port plugs to prevent contamination during transit. Remove plugs immediately before fitting the hoses. Contact us for any installation support.

Supply and Lead Times

GBC supplies tractor hydraulic pumps to dealers and workshops across Australia and internationally. We hold stock of high-volume Fiat and Ford pump variants and can advise current availability for the GBC-FIAT-640BH. For large orders, we can provide batch-specific inspection documentation.

Contact our sales team for pricing, lead times, and information on our full Fiat tractor hydraulic pump range.

About GBC

GBC is a specialist supplier of aftermarket agricultural and industrial hydraulic components, operating across Australia and key global markets. With a manufacturing background spanning gear pumps, hydraulic cylinders, power transmission components, and tractor drivetrain parts, GBC provides OEM-grade replacement parts with flexible order quantities and competitive lead times. Our sourcing team works directly with certified factories to ensure every unit meets or exceeds original equipment specifications. Learn more on our About Us page, or browse our full range at the GBC homepage.

Frequently Asked Questions