Ford 5640 6640 7740 7840 8240 8340 Tractor Hydraulic Gear Pump Replacement

GBC-83952508 — Ford 5640 6640 7740 7840 8240 Tractor Hydraulic Gear Pump Replacement

The Ford 5640, 6640, 7740, 7840, 8240, and 8340 tractors represent the transition generation between the Ford badge and New Holland branding, built in the early-to-mid 1990s. These are genuinely large-frame tractors — the 8240 and 8340 in particular are in the 100–140 hp range — and they were widely adopted across Australia’s broadacre dryland cropping regions in Western Australia, South Australia, and the NSW wheat belt. Operating with large cultivators, air seeders, disc chains, and hay balers, these tractors place very high demands on hydraulic flow. A failing gear pump is particularly noticeable in applications where multiple remote cylinders need to operate at the same time.

The GBC-83952508 replaces OEM pump numbers E8NN600AA, E9NN600AA, 83952508, and 86631006. It is a transmission-mounted external gear pump with right-hand (clockwise) rotation, engineered to the Ford 5640–8340 drivetrain specification. If you run multiple tractors in this range and need to rationalise parts holdings, the GBC-83952508 covers the complete 5640–8340 generation. Explore our full range at the GBC homepage.

OEM Reference Numbers and Fitment

E8NN600AA and E9NN600AA are the primary OEM casting references for this pump family. The later service-part numbers 83952508 and 86631006 supersede these references in Ford and New Holland parts systems. If any of these numbers appear on your existing pump, the GBC-83952508 is the correct replacement.

Technical Specifications

Broadacre Cropping and High-Demand Hydraulic Applications

Broadacre cropping in Australia’s grain belt is one of the most hydraulically demanding environments for agricultural tractors. During the seeding window — a period of intense activity measured in days rather than weeks — tractors are run almost continuously. Air seeder fans, toolbar fold cylinders, depth-wheel cylinders, and monitor systems all draw from the hydraulic circuit simultaneously. When the hydraulic gear pump begins to lose displacement due to internal gear wear, the first symptoms are usually slow or partial toolbar folding and delayed remote cylinder response under full load.

The 5640–8340 generation was built for exactly these high-output applications, and the hydraulic pump is a service item that most broadacre operators expect to replace at some point in the machine’s life. Choosing an aftermarket replacement like the GBC-83952508 delivers the same operational reliability as an OEM unit at a substantially lower cost, with supply chain flexibility that avoids the long lead times sometimes associated with OEM sourcing in regional Australia.

Installation and Maintenance for Large-Frame Tractors

On the Ford 7740–8340 range, the hydraulic gear pump is accessible from the transmission case after removing any guarding and disconnecting the hydraulic hose connections. These tractors carry a relatively large hydraulic sump volume, and it is worth considering a full sump drain, clean, and refill when replacing the pump — particularly on tractors with unknown service histories. Any metallic debris left in the sump from a failing pump can recirculate and damage the new unit within hours of startup if not removed.

Torque specifications for pump mounting bolts on these models are found in the Ford Technical Service Manual (TSM) for the 5640–8340 series. Ensure all O-ring faces are clean and undamaged before assembly. If you are a dealer or workshop ordering replacement pumps for a fleet of these tractors, contact our team for volume pricing and availability confirmation.

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