| Manufacturer | Ford |
| Price | 33,400(USD) |
| Model | 6640 |
| Equipment Type | Utility Tractors |
| Factory | Basildon, England |
VARIANTS
| 6640S | 8-speed economy |
| 6640SL | 12-speed |
| 6640SLE | 16-speed premium |
OCED TRACTOR TEST 1657 2
| Description | Diesel 16x4 4WD April 24 - May 11, 1992 Link: OCED Tractor Test 1657 file PTO performance Drawbar performance Gear 5-Low used for power test Gear 2H used for pull test |
| Max power | 67.18hp / 50.1kW |
| Fuel use | 4.7gal/hour / 17.8l/hour |
| Power at rated engine speed | 76.75hp / 57.2kW |
| Power at rated PTO speed | 75.63hp / 56.4kW |
| Max pull | 10,512lbs / 4768kg |
FORD 6640 POWER
| Engine (gross) | 90.7hp / 67.6kW |
| Engine (net) | 85hp / 63.4kW |
| PTO (claimed) | 76hp / 56.7kW |
| Drawbar (tested) | 67.18hp / 50.1kW |
| PTO (tested) | 77.13hp / 57.5kW |
ENGINE DETAIL
The Ford 6640 tractor features a robust 5.0L Genesis diesel engine with a high compression ratio of 17.5:1, providing a gross power output of 90.7 hp at 2200 RPM, suitable for various agricultural tasks. The substantial torque of 337 lb-ft at just 1200 RPM enhances its pulling capacity, making it effective for heavy-duty operations. Notable advantages include efficient air filtration via dual paper elements and manageable coolant capacity, though routine valve clearance maintenance is necessary for optimal engine performance.
| Description | Ford Genesis diesel 4-cylinder 8-valve liquid-cooled |
| Displacement | 304ci / 5.0L |
| Bore/Stroke | 4.40x5.00inches / 112x 127mm |
| Power (gross) | 90.7hp / 67.6kW |
| Air cleaner | dual paper elements |
| Compression | 17.5:1 |
| Rated RPM | 2200 |
| Idle RPM | 725-2375 |
| Torque | 337lb-ft / 457.0Nm |
| Torque RPM | 1200 |
| Firing order | 1-3-4-2 |
| Starter volts | 12 |
| Coolant capacity | 15.3qts / 14.5L 16.9qts / 16.0L *With cab |
| Intake valve clearance | 0.016inches / 0.406mm (cold) |
| Exhaust valve clearance | 0.019inches / 0.483mm (cold) |
ENGINE OIL
The Ford 6640 tractor features a relatively modest oil capacity of 12.1 quarts (11.5 liters), which is essential for maintaining optimal engine lubrication and performance. Regular oil changes and monitoring levels are crucial to prevent overheating and wear, especially under heavy load or extended operation. While the oil capacity is manageable, operators should consider the frequency of maintenance based on usage to ensure longevity and reliability of the tractor’s engine.
| Oil capacity | 12.1qts / 11.5L |
FORD 6640 ENGINE
The Ford 6640 tractor is powered by a robust 5.0L 4-cylinder diesel engine, delivering reliable torque for various agricultural tasks. Its fuel capacity varies with configurations—25 gallons (94.6L) standard, expandable to 52.7 gallons (199.5L) with ROPS and 46.9 gallons (177.5L) in cab models, providing extended operating time for larger fields. A potential advantage is its adaptability for different operator safety preferences, but a larger fuel tank may increase overall weight, potentially affecting maneuverability in tight spaces.
| Description | Ford 5.0L 4-cyl diesel |
| Fuel tank | 25gal / 94.6L 52.7gal / 199.5L (ROPS optional) 46.9gal / 177.5L (cab optional) |
TRANSMISSIONS OVERVIEW
The Ford 6640 features a robust transmission system offering multiple configurations: 8-speed constant mesh for simplicity, 16-speed two-speed power shift for versatility, 12-speed synchronized for smoother gear transitions, and 16-speed four-speed power shift for enhanced performance under varying load conditions. This range allows for tailored gear selection according to field and road conditions, improving operational efficiency. However, the complexity of the four-speed power shift may require more maintenance and operator training to leverage its full potential.
| Description | 8-speed constant mesh 16-speed two-speed power shift 12-speed synchronized 16-speed four-speed power shift |
TRANSMISSION 1
The Ford 6640 tractor features an EconoShift constant mesh transmission with 8 forward and 2 reverse gears, allowing for efficient power management in various field conditions. The operation requires stopping the tractor to shift gears or range, which can be a challenge in tasks requiring frequent speed adjustments. Its dry disc clutch and substantial oil capacity (69.6 qts / 65.9 L) contribute to reliable performance, but users should be aware of potential wear on the clutch from excessive engagement.
| Transmission | EconoShift |
| Type | constant mesh |
| Gears | 8 forward and 2 reverse |
| Clutch | dry disc |
| Oil capacity | 69.6qts / 65.9L |
| Description | 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 |
SPEEDS 1
| Description | With 16.9-34 rear tires |
TRANSMISSION 2
The Ford 6640 tractor features a Dual Power two-speed power shift transmission, enhancing operational versatility with 16 forward and 4 reverse gears. The dry disc clutch provides reliability but may require more maintenance and adjustments under heavy usage. With an oil capacity of 69.6 quarts, ensure regular checks to maintain optimal performance, especially in demanding agricultural scenarios.
| Transmission | Dual Power |
| Type | two-speed power shift |
| Gears | 16 forward and 4 reverse |
| Clutch | dry disc |
| Oil capacity | 69.6qts / 65.9L |
| Description | 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 |
SPEEDS 2
| Description | With 16.9-34 rear tires |
TRANSMISSION 3
The Ford 6640 tractor features a 12-speed SynchroShift transmission, allowing smooth synchronized gear shifts across low, medium, and high ranges, with a right-hand shuttle for enhanced maneuverability. A key advantage is the synchronized shifting between medium and high ranges, although operators must stop to shift from low, which can hinder efficiency in certain field operations. Optional dual power converts this to a 24-speed, increasing versatility for varied tasks such as plowing or transporting heavy loads.
| Transmission | SynchroShift |
| Type | synchronized |
| Gears | 12 forward and reverse |
| Clutch | dry disc |
| Description | 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 |
SPEEDS 3
| Description | With 16.9-38 rear tires |
TRANSMISSION 4
The Ford 6640 features an advanced ElectroShift transmission with 16 total gears (8 forward and 8 reverse), offering smooth operation through a four-speed power shift system across synchronized ratio groups. The use of a wet disc clutch enhances durability, but shifting between range groups requires clutch activation, which can be a potential drawback during fast-paced operations. This tractor is particularly beneficial in applications requiring frequent gear changes, such as loader work or field operations, where seamless transitions between power shifts can optimize productivity.
| Transmission | ElectroShift/Pulse Command |
| Type | four-speed power shift |
| Gears | 16 forward and reverse |
| Clutch | wet disc |
| Oil capacity | 64qts / 60.6L |
| Description | 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 |
SPEEDS 4
| Description | With 16.9-38 rear tires |
MECHANICAL
The Ford 6640 tractor offers multiple drivetrain configurations (2WD, MFWD, 4WD), which enhances versatility for various field applications. Its differential lock options (mechanical/electro-hydraulic) provide better traction in challenging conditions, while the hydrostatic power steering ensures ease of maneuverability. The available Comfort Command Cab, especially with air conditioning, enhances operator comfort during prolonged use, particularly in hot environments, although the mechanical brakes in the base model may not provide the same performance as hydraulic systems in more advanced variants.
| Chassis | 4x2 2WD/4x4 MFWD 4WD (optional) |
| Final drives | inboard planetary |
| Differential lock | mechanical (S)/electro-hydraulic (SL/SLE) |
| Steering | hydrostatic power |
| Brakes | mechanical (S)/hydraulic wet disc (SL/SLE) |
| Cab | Two-post foldable ROPS. Straddle-mount (6640 S) or raised deck (SL/SLE). Comfort Command Cab optional with air-conditioning (SL/SLE) |
| Transmissions | 8-speed constant mesh 16-speed two-speed power shift 12-speed synchronized 16-speed four-speed power shift |
HYDRAULICS
| Type | open center (S/SL)/closed center load sensing (SLE) |
| Valves | 1 to 4 |
| Pump flow | 18.2gpm / 68.9lpm 21gpm / 79.5lpm (SLE) |
| Steering press. | 2100psi / 144.8bar |
TRACTOR HITCH
| Rear Type | II |
| Control | Position control and top-link draft sensing. Electronic lower-link sensing optional on 6640 SLE |
| Rear lift (at 24 | 4,200lbs / 1905kg 4,439lbs / 2013kg (optional) 6,210lbs / 2816kg (SLE) 6,564lbs / 2977kg (SLE optional) |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 540/540/1000 (optional) |
FORD 6640 TIRES
The Ford 6640 tractor, equipped with 7.50-16 Ag front tires and 16.9-30 Ag rear tires, offers a balanced weight distribution and stability, enhancing traction in various agricultural applications. The larger rear tire diameter enables improved power transfer and reduced soil compaction, making it suitable for field work. However, the relatively smaller front tires may limit handling capabilities on uneven terrains, potentially requiring additional modifications for optimal performance.
| Ag front | 7.50-16 |
| Ag rear | 16.9-30 |
DIMENSIONS
| Wheelbase | 93inches / 236cm |
| Length | 162inches / 411cm |
| 2WD Width | 77inches / 195cm |
| 4WD Width | 80inches / 203cm |
| 2WD Clearance (front axle) | 22inches / 55cm |
| 4WD Clearance (front axle) | 20inches / 50cm |
FORD 6640 WEIGHT
| 2WD ROPS Shipping | 7,099lbs / 3220kg |
| 4WD ROPS Shipping | 8,091lbs / 3670kg |
| 2WD Cab Shipping | 8,129lbs / 3687kg |
| 4WD Cab Shipping | 9,121lbs / 4137kg |
| Operating | 8,135lbs / 3690kg (4WD ROPS) |
| Ballasted | 10,368lbs / 4702kg |
FORD 6640 HEIGHT
| Hood | 67inches / 170cm |
| Cab | 107inches / 271cm |
| Exhaust | 112inches / 284cm |
DIMENSIONS & TIRES
The Ford 6640 tractor features a relatively short wheelbase of 93 inches, enhancing its maneuverability in tight spaces but potentially limiting stability when towing heavy loads. With a weight range of 7099 to 9121 pounds, it provides substantial traction, particularly with its rear tire size of 16.9-30, which is advantageous for plowing and cultivating operations. However, the front tire size of 7.50-16 may lead to weight distribution challenges, especially on uneven terrain, necessitating careful management for optimal performance.
| Wheelbase | 93inches / 236cm |
| Weight | 7099 to 9121 pounds |
| Front tire | 7.50-16 |
| Rear tire | 16.9-30 |
FORD 7411 LOADER
| Height (to pin) | 134inches / 340cm |
| Clearance, dumped bucket | 99inches / 251cm |
| Dump reach | 48inches / 121cm |
| Breakout force (lift) | 5265lbs / 2388kg |
| Lift to full height (at pin) | 3050lbs / 1383kg |
6640 SERIAL NUMBERS
| Location | Data plate inside hood |
| 1991 | BC68791 |
| 1992 | BD02865 |
| 1993 | BD35935 |
| 1994 | BD65544 |
| 1995 | BD98440 |
| 1996 | 021630B |
| 1997 | 056502B |
| 1998 | 083503B |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 55 (ROPS)/100 (cab) |
| Batteries | 1 (ROPS)/2 (cab) |
| Battery CCA | 800 |
| Battery volts | 12 |