Ford 6640 Tractor Specifications (1991–1995)
The Ford 6640, produced from 1991 to 1995, is part of the PowerStar 40 Series, representing a major step forward from the 10-Series tractors such as the Ford 6610.
Built in Basildon, England, the 6640 offered improved power, upgraded transmissions, advanced hydraulics, and significantly better operator comfort.
The tractor was available in three versions:
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6640 S – Economy model (8-speed)
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6640 SL – Mid-range (12-speed synchromesh)
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6640 SLE – Premium version with electronic hydraulics and 16-speed power shift
With a 5.0L Ford diesel engine, up to 90.7 hp, and multiple hydraulic configurations, the Ford 6640 became a popular utility tractor across Europe, Africa, and Latin America.
1. Overview
| Item | Details |
|---|---|
| Model | Ford 6640 |
| Production Years | 1991–1995 |
| Series | PowerStar 40 Series |
| Type | Utility tractor |
| Manufacturer | Ford |
| Built in | Basildon, England |
| Original Price (1998) | USD $33,400 |
| Variants | 6640S, 6640SL, 6640SLE |
| Drive Options | 2WD or 4WD (MFWD) |
| Operator Station | Two-post foldable ROPS, raised deck (SL/SLE), Comfort Command Cab optional |
2. Engine
The Ford 6640 uses a 5.0-liter Ford 4-cylinder diesel, delivering strong torque and reliable performance for heavy implement use.
Optional larger fuel tanks support long working days.
| Specification | Details |
|---|---|
| Engine Model | Ford Diesel |
| Displacement | 5.0 L, 4-cylinder |
| Fuel Type | Diesel |
| Engine (Gross Power) | 90.7 hp (67.6 kW) |
| Engine (Net Power) | 85 hp (63.4 kW) |
| PTO Power (claimed) | 76 hp (56.7 kW) |
| Fuel Tank Options | 25 gal (94.6 L) / 52.7 gal (199.5 L ROPS opt.) / 46.9 gal (177.5 L cab) |
3. Transmission Options
The Ford 6640 had several transmission choices across S / SL / SLE variants:
| Variant | Transmission | Description |
|---|---|---|
| 6640 S | 8-speed constant mesh | basic, durable, economy model |
| 6640 SL | 12-speed synchronized | easier shifting for field use |
| 6640 SLE | 16-speed powershift | premium model with electronic controls |
Additional mechanical features:
| Feature | S | SL | SLE |
|---|---|---|---|
| Differential Lock | Mechanical | Electro-hydraulic | Electro-hydraulic |
| Brakes | Mechanical | Wet hydraulic disc | Wet hydraulic disc |
| Steering | Power steering | Power steering | Power steering |
4. Power & Performance Tests
| Category | Tested Power |
|---|---|
| Drawbar Power (tested) | 67.18 hp (50.1 kW) |
| PTO Power (tested) | 77.13 hp (57.5 kW) |
These official results confirm that the 6640 exceeds its advertised PTO rating under load.
5. Hydraulics
The 6640 offered advanced hydraulic performance, especially in the SLE version.
| Specification | S / SL | SLE |
|---|---|---|
| Hydraulic Type | Open center | Closed-center load sensing |
| Pump Flow | 18.2 gpm (68.9 L/min) | 21 gpm (79.5 L/min) |
| Valves | 1–4 | 1–4 |
| Steering Pressure | 2100 psi (144.8 bar) | 2100 psi |
Hitch System
| Category | Details |
|---|---|
| Rear Hitch Type | Category II |
| Control | Position + top-link draft control (Electronic lower-link sensing optional for SLE) |
| Rear Lift Capacity (24″) | Standard: 4200 lbs (1905 kg) |
| Optional: 4439 lbs (2013 kg) | |
| SLE: 6210 lbs (2816 kg) | |
| SLE optional high-lift: 6564 lbs (2977 kg) |
6. PTO (Power Take-Off)
| Specification | Details |
|---|---|
| Type | Independent rear PTO |
| Speeds | 540 rpm (standard) |
| Optional | 540 / 1000 rpm dual-speed |
| Shaft | 1.375-inch |
7. Dimensions & Tires
| Category | Value |
|---|---|
| Wheelbase | 93 in (236 cm) |
| Weight | 7,099–9,121 lbs |
| Front Tire | 7.50–16 |
| Rear Tire | 16.9–30 |
8. Attachments
Compatible attachments include:
| Attachment | Use |
|---|---|
| Front-End Loader | Material handling, lifting |
| Rotary Cutters | Pasture mowing |
| Plows & Harrows | Tillage |
| Balers | Hay operations |
| Sprayers & Cultivators | Row-crop work |
9. Photos
10. Serial Numbers
Serial number plate is located inside the hood.
| Year | Serial Number |
|---|---|
| 1991 | BC68791 |
| 1992 | BD02865 |
| 1993 | BD35935 |
| 1994 | BD65544 |
| 1995 | BD98440 |
| 1996 | 021630B |
| 1997 | 056502B |
| 1998 | 083503B |
Summary
The Ford 6640 remains one of the most capable and versatile tractors in the PowerStar 40 Series.
Key strengths include:
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Strong 5.0L diesel engine (up to 90.7 hp)
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Multiple transmission options for all types of work
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High-performance hydraulics (21 gpm on SLE)
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Excellent 76–77 hp PTO performance
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Strong lift capacity up to 6564 lbs
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Durable planetary final drives and reliable MFWD system
These features make the Ford 6640 a highly desirable tractor in export markets around the world.
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