Compare/Ford 6640 vs Ford 6810 Mark III

Ford 6640 vs Ford 6810 Mark III

Verdict: Ford 6640 vs Ford 6810 Mark III

The Ford 6640 and the Ford 6810 Mark III are both tractors — here is how they stack up on the figures that matter. Ford 6640 leads on rated power with 91 hp against 90 hp. Ford 6640 is the lighter machine (7,099 kg vs 7,280 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Ford 6640 holds more fuel (94.6 L vs 79.5 L) for longer stints between fills. Ford 6640 is the newer design (1991 vs 1988). In short: choose the Ford 6640 for outright pulling power, or the Ford 6810 Mark III if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Acreage600 acBudgetMain crop / use

Fit & specs

Ford

Fit score

Best match

Clear

Ford

Fit score

Best match

Clear

Rated power

91 hp

90 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

FordReference

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

With 16.9-38 rear tires.Reference

Drive

4x4 MFWD 4WD (optional)Reference

—

Final drives

inboard planetaryReference

planetaryReference

Differential lock

electro-hydraulic (SL/SLE)Reference

mechanical rearReference

Brakes

hydraulic wet disc (SL/SLE)Reference

—

Variants

6640S

8-speed economyReference

—

6640SL

12-speedReference

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6640SLE

16-speed premiumReference

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Engine

Fuel tank

177.5 LReference

—

Engine (gross)

67.6 kWReference

—

Engine (net)

63.4 kWReference

67.1 kWReference

Drawbar (tested)

50.1 kWReference

—

Displacement

5.0 LReference

4.4 LReference

Bore/Stroke

112 x 127 mmReference

112 x 112 mmReference

Power (net)

63.4 kWReference

67.1 kWReference

Power (gross)

67.6 kWReference

—

Air cleaner

dual paper elementsReference

—

Compression

17.5:1Reference

16.3:1Reference

Rated RPM

2200Reference

2070Reference

Idle RPM

725-2375Reference

—

Torque

457.0 NmReference

358.0 NmReference

Torque RPM

1200Reference

1400Reference

Firing order

1-3-4-2Reference

—

Starter volts

12Reference

—

Coolant capacity

16.0 LReference

—

Intake valve clearance

0.406 mmReference

—

Exhaust valve clearance

0.483 mmReference

—

Oil capacity

60.6 LReference

—

Max power

50.1 kWReference

—

Power at rated engine speed

57.2 kWReference

—

ROPS Fuel tank

—

79.5 LReference

Cab Fuel tank

—

106.0 LReference

Transmission

ElectroShift/Pulse CommandReference

Dual PowerReference

Gears

16 forward and reverseReference

16 forward and 8 reverseReference

Clutch

wet discReference

330mm discReference

PTO & Hydraulics

PTO (claimed)

56.7 kWReference

61.9 kWReference

PTO (tested)

57.5 kWReference

—

Type

four-speed power shiftReference

open center with closed-center valvesReference

Valves

1 to 4Reference

—

Pump flow

79.5 lpmReference

68.9 lpmReference

Steering press.

144.8 barReference

—

Rear Type

IIReference

Control

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

—

Rear lift (at 24"/610mm)

2977 kgReference

—

Rear PTO

independentReference

Rear PTO Type

540/1000Reference

540/1000 (1.375)Reference

Power at rated PTO speed

56.4 kWReference

—

Pressure

—

172.4 barReference

SCV flow

—

54.9 lpmReference

Rear lift (at ends)

—

2664 kgReference

Engine RPM

—

1000@2060Reference

Dimensions

Wheelbase

236 cmReference

—

Weight

7099 to 9121 poundsReference

7280 to 8760 poundsReference

Front tire

7.50-16Reference

10.00-16Reference

Rear tire

16.9-30Reference

—

Ag front

7.50-16Reference

—

Ag rear

16.9-30Reference

—

Length

411 cmReference

—

2WD Width

195 cmReference

—

4WD Width

203 cmReference

—

2WD Clearance (front axle)

55 cmReference

—

4WD Clearance (front axle)

50 cmReference

—

2WD ROPS Shipping

3220 kgReference

—

4WD ROPS Shipping

3670 kgReference

—

2WD Cab Shipping

3687 kgReference

—

4WD Cab Shipping

4137 kgReference

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Operating

3690 kgReference

—

Ballasted

4702 kgReference

—

2WD Wheelbase

—

222 cmReference

4WD Wheelbase

—

225 cmReference

2WD Rear tire

—

18.4-34Reference

2WD Standard tires (ag)

—

Front: 10.00-16. Rear: 18.4-34Reference

4WD Standard tires (ag)

—

Front: 14.9-24. Rear: 18.4-34Reference

2WD Length

—

368 cmReference

4WD Length

—

388 cmReference

2WD Ground clearance

—

43 cmReference

4WD Ground clearance

—

38 cmReference

2WD Front tread

—

132 to 2260 cmReference

4WD Front tread

—

152 to 223 cmReference

Rear tread

—

142 to 203 cmReference

2WD ROPS

—

3302 kgReference

2WD Cab

—

3492 kgReference

4WD ROPS

—

3592 kgReference

4WD Cab

—

3973 kgReference

Ford 6640 attachments

6640 Serial Numbers

1991

BC68791Reference

—

1992

BD02865Reference

—

1993

BD35935Reference

—

1994

BD65544Reference

—

1995

BD98440Reference

—

1996

021630BReference

—

1997

056502BReference

—

1998

083503BReference

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Location:

Data plate inside hood.Reference

—

Electrical

Ground

negativeReference

Charging system

alternatorReference

ROPS Charging amps

55Reference

45Reference

Cab Charging amps

100Reference

80Reference

ROPS Batteries

1Reference

—

Cab Batteries

2Reference

—

Battery CCA

800Reference

—

Battery volts

12Reference

Battery AH

—

128Reference

Attachment overview

Ford 6640 Height

Hood

170 cmReference

—

Cab

271 cmReference

266 cmReference

Exhaust

284 cmReference

—

Test results

Fuel use

17.0 l/hourReference

—

Max pull

4768 kgReference

—

Speeds

Ford 6810 Height

2WD Exhaust

—

279 cmReference

4WD Exhaust

—

287 cmReference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.