Tractor · 1991Unverified
Ford 6640
Ford 6640 — PowerStar 40 Series · 91 hp. Reference specifications; pending source verification.
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
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.