The Ford 6640 tractor specifications include engine power rated at 90.7 hp (67.6 kW), a constant mesh, two-speed power shift, synchronized, or four-speed power shift transmission, and a listed weight of 7,099 to 9,121 lbs.
Ford 6640 key specifications
| Engine power |
90.7 hp (67.6 kW) |
| PTO power |
76 hp (56.7 kW) |
| Displacement |
304 cu in (5.0 L) |
| Transmission |
constant mesh, two-speed power shift, synchronized, or four-speed power shift |
| Fuel capacity |
25 gal (94.6 L) |
| Weight |
7,099 to 9,121 lbs |
| Wheelbase |
93 inches (236 cm) |
Ford 6640 industry comparison
See how this tractor compares across up to six main specifications using the low, average and high values for Ford farm and compact tractors in this specifications database.
Engine power90.7 hp
Low 13 hpAverage 96.2 hpHigh 360 hp
PTO power76 hp
Low 11 hpAverage 78.8 hpHigh 316 hp
Displacement5 L
Low 0.7 LAverage 4.4 LHigh 14.8 L
Fuel capacity25 gal
Low 3.5 galAverage 40.3 galHigh 286 gal
Maximum listed weight9,121 lbs
Low 1,344 lbsAverage 8,007.5 lbsHigh 32,500 lbs
Wheelbase93 in
Low 48 inAverage 89.4 inHigh 139 in
This model Ford farm and compact tractors average
Ford 6640 power chart
Compare the available engine, PTO and drawbar power ratings.
Tested drawbar power67.2 hp
Ford 6640 capacity chart
Compare the tractor's listed fuel, hydraulic and service-fluid capacities.
Maximum fuel capacity94.6 L
Ford 6640 dimensions chart
Compare the main listed tractor dimensions using centimetres.
Engine specifications
| Bore/Stroke |
4.40 × 5.00 inches (112 × 127 mm) |
| Rated RPM |
2,200 |
| Torque |
337 lb-ft (457.0 Nm) |
| Torque RPM |
1,200 |
| Compression |
17.5:1 |
| Air cleaner |
dual paper elements |
| Oil capacity |
12.1 qt (11.5 L) |
| Coolant capacity |
15.3 qt (14.5 L) |
| Starter volts |
12 |
| Net engine power |
85 hp (63.4 kW) |
| Engine speed range |
725-2,375 |
| Firing order |
1-3-4-2 |
| Intake valve clearance |
0.016 inches (0.406 mm, cold) |
| Exhaust valve clearance |
0.019 inches (0.483 mm, cold) |
Transmission options
| Gear options |
8 forward and 2 reverse, 16 forward and 4 reverse, 12 forward and reverse, or 16 forward and reverse |
| Clutch |
dry disc or wet disc |
| Oil capacity |
69.6 qt (65.9 L) or 64 qt (60.6 L) |
PTO and hitch
| Drawbar (tested) |
67.18 hp (50.1 kW) |
| PTO (tested) |
77.13 hp (57.5 kW) |
| Rear hitch category |
Category II |
| Hitch control |
Position control and top-link draft sensing. Electronic lower-link sensing optional on 6,640 SLE. |
| Rear lift (at 24"/610mm) |
4,200 lbs (1,905 kg) |
| Rear PTO |
independent |
| Rear PTO speed |
540 rpm |
Hydraulics
| Hydraulic type |
open center (S/SL) |
| Valves |
1 to 4 |
| Pump flow |
18.2 gpm (68.9 L/min) |
| Steering pressure |
2,100 psi (144.8 bar) |
Mechanical specifications
| Drive |
4×2 2WD |
| Final drives |
inboard planetary |
| Differential lock |
mechanical (S) |
| Brakes |
mechanical (S) |
Electrical specifications
| Electrical ground |
negative |
| Charging system |
alternator |
| ROPS charging amps |
55 |
| Cab charging amps |
100 |
| ROPS batteries |
1 |
| Cab batteries |
2 |
| Battery CCA |
800 |
| Battery volts |
12 |
Dimensions and weight
| Listed weight range |
7,099 to 9,121 lbs |
| Length |
162 inches (411 cm) |
| Operating weight |
8,135 lbs (3,690 kg, 4WD ROPS) |
| Ballasted weight |
10,368 lbs (4,702 kg) |
| 2WD front axle clearance |
22 inches (55 cm) |
| 4WD front axle clearance |
20 inches (50 cm) |
| Hood height |
67 inches (170 cm) |
| Cab height |
107 inches (271 cm) |
| Exhaust height |
112 inches (284 cm) |
Tires and tread
| Front tire |
7.50-16 |
| Rear tire |
16.9-30 |
Attachments
| Attachment weight |
1,636 lbs (742 kg) |
| Bucket width |
60, 72, or 84 inches (152, 182, or 213 cm) |
Note: Industry comparison values are calculated from models in this specifications database. Specifications can vary by year, market, configuration, tires and optional equipment. For official specifications, check the tractor’s original operator, service or parts manual.
