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Tractor · 1991Unverified

Ford 6640

Name: Ford 6640
Brand: Ford

Ford 6640 — PowerStar 40 Series · 91 hp. Reference specifications; pending source verification.

The Ford 6640 is a tractor with a power rating of 91 hp, placing it in the middle of its class. Manufactured from 1991 to 1995, this model features a 4-cylinder diesel liquid-cooled engine powering a mechanical front-wheel drive with a powershift transmission. The 6640 has a listed weight of 7099 to 9121 pounds, and is suited to working on areas of approximately 200–800 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

91 hp

Max power

57.5 kW

Weight

7099 to 9121 pounds

Catalogue coverage

Variants represented

Richest spec table

140 rows

Recorded power

91 hp

Transmissions

8-speed constant mesh

Production years

1991-1995

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerFordReference

Utility tractorReference

Built in Basildon, EnglandReference

Original price was $33,400 in 1998Reference

Drive4x2 2WDReference

Drive4x4 MFWD 4WD (optional)Reference

Final drivesinboard planetaryReference

Differential lockmechanical (S)Reference

Differential lockelectro-hydraulic (SL/SLE)Reference

Power steeringReference

Brakesmechanical (S)Reference

Brakeshydraulic wet disc (SL/SLE)Reference

Two-post foldable ROPS. Straddle-mount (6640 S) or raised deck (SL/SLE). Comfort Command Cab optional with air-conditioning (SL/SLE).Reference

Variants

6640S8-speed economyReference

6640SL12-speedReference

6640SLE16-speed premiumReference

Engine

Ford 5.0L 4-cyl dieselReference

Fuel tank94.6 LReference

Fuel tank199.5 LReference

Fuel tank177.5 LReference

Engine (gross)67.6 kWReference

Engine (net)63.4 kWReference

Drawbar (tested)50.1 kWReference

Ford GenesisReference

dieselReference

4-cylinder 8-valveReference

liquid-cooledReference

Displacement5.0 LReference

Bore/Stroke112 x 127 mmReference

Power (net)63.4 kWReference

Power (gross)67.6 kWReference

Air cleanerdual paper elementsReference

Compression17.5:1Reference

Rated RPM2200Reference

Idle RPM725-2375Reference

Torque457.0 NmReference

Torque RPM1200Reference

Firing order1-3-4-2Reference

Starter volts12Reference

Coolant capacity14.5 LReference

Coolant capacity16.0 LReference

Intake valve clearance0.406 mmReference

Exhaust valve clearance0.483 mmReference

Oil capacity11.5 LReference

Max power57.5 kWReference

Power at rated engine speed57.2 kWReference

Max power50.1 kWReference

Transmission

8-speed constant meshReference

16-speed two-speed power shiftReference

12-speed synchronizedReference

16-speed four-speed power shiftReference

TransmissionEconoShiftReference

Typeconstant meshReference

Gears8 forward and 2 reverseReference

Clutchdry discReference

Oil capacity65.9 LReference

Four gears (1-4), plus reverse, in two ranges (L/H). Optional creeper provided a third range. Tractor must be stopped and clutch used to shift gears or range. The eight-speed transmission was only used on the 6640S.Reference

TransmissionDual PowerReference

Typetwo-speed power shiftReference

Gears16 forward and 4 reverseReference

Dual Power adds a two-speed power shift between direct drive and the lower Dual Power range to the basic eight-speed transmission. The Dual Power range is engaged by a switch on the dashboard. Dual Power was an option on the 6640S.Reference

TransmissionSynchroShiftReference

TypesynchronizedReference

Gears12 forward and reverseReference

Four gears (1-4) in three ranges (L/M/H) with right-hand shuttle lever. Gear shifts are synchronized. Shifts between medium and high ranges are synchronized, but the tractor should be stopped to shift to or from low range. Synchronized shuttle shifting. The 12-speed SynchroShift was standard on the 6640 SL. Dual power was an option with the SynchroShift, turning it into a 24-speed transmission.Reference

TransmissionElectroShift/Pulse CommandReference

Typefour-speed power shiftReference

Gears16 forward and reverseReference

Clutchwet discReference

Oil capacity60.6 LReference

Four power shift gears arranged in two synchronized ratio groups (1-4 and 5-8). Two synchronized ranges (low/high) and right-hand shuttle. Clutch must be used to shift range or move between the lower (1-4) and higher (5-8) gear ratio groups. Push-button power shifting between the four gears in a ratio group. Push-button de-clutching on the shuttle lever allow shifting without the foot clutch. The 16 power shift was standard on the 6640 SLE.Reference

PTO & Hydraulics

PTO (claimed)56.7 kWReference

PTO (tested)57.5 kWReference

Typeopen center (S/SL)Reference

Typeclosed center load sensing (SLE)Reference

Valves1 to 4Reference

Pump flow68.9 lpmReference

Pump flow79.5 lpmReference

Steering press.144.8 barReference

Rear TypeIIReference

ControlPosition control and top-link draft sensing. Electronic lower-link sensing optional on 6640 SLE.Reference

Rear lift (at 24"/610mm)1905 kgReference

Rear lift (at 24"/610mm)2013 kgReference

Rear lift (at 24"/610mm)2816 kgReference

Rear lift (at 24"/610mm)2977 kgReference

Rear PTOindependentReference

Rear PTO Type540Reference

Rear PTO Type540/1000Reference

Power at rated PTO speed56.4 kWReference

Dimensions

Wheelbase236 cmReference

Weight7099 to 9121 poundsReference

Front tire7.50-16Reference

Rear tire16.9-30Reference

Ag front7.50-16Reference

Ag rear16.9-30Reference

Length411 cmReference

2WD Width195 cmReference

4WD Width203 cmReference

2WD Clearance (front axle)55 cmReference

4WD Clearance (front axle)50 cmReference

2WD ROPS Shipping3220 kgReference

4WD ROPS Shipping3670 kgReference

2WD Cab Shipping3687 kgReference

4WD Cab Shipping4137 kgReference

Operating3690 kgReference

Ballasted4702 kgReference

Ford 6640 attachments

front-end loaderReference

6640 Serial Numbers

Location:Data plate inside hood.Reference

1991BC68791Reference

1992BD02865Reference

1993BD35935Reference

1994BD65544Reference

1995BD98440Reference

1996021630BReference

1997056502BReference

1998083503BReference

FAQ: How to read a serial number table.Reference

Electrical

GroundnegativeReference

Charging systemalternatorReference

ROPS Charging amps55Reference

Cab Charging amps100Reference

ROPS Batteries1Reference

Cab Batteries2Reference

Battery CCA800Reference

Battery volts12Reference

Attachment overview

Ford 7210 loaderReference

Ford 7411 loaderReference

Ford 6640 Height

Hood170 cmReference

Cab271 cmReference

Exhaust284 cmReference

Test results

Diesel 16x4 4WDApril 24 - May 11, 1992Link: OCED Tractor Test 1657 fileReference

PTO performanceReference

Fuel use17.8 l/hourReference

Fuel use17.0 l/hourReference

Drawbar performanceReference

Gear 5-Low used for power test.Reference

Max pull4768 kgReference

Gear 2H used for pull test.Reference

Speeds

With 16.9-34 rear tires.Reference

With 16.9-38 rear tires.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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