Compare/Ford 3600 vs Ford 681

Ford 3600 vs Ford 681

Verdict: Ford 3600 vs Ford 681

The Ford 3600 and the Ford 681 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 48 hp. Ford 681 is the lighter machine (1,496 kg vs 3,846 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Ford 3600 is the newer design (1975 vs 1957). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.

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Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Ford

Fit score

Best match

Clear

Ford

Fit score

Best match

Clear

Rated power

48 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

FordReference

With 12.4-28 rear tires.Reference

Diesel Select-O-Speed 2WDJune 20 - 26, 1959Link: Nebraska Tractor Test 706 fileReference

Differential lock

mechanical rearReference

—

Steering

—

power assist optionalReference

Variants

611

—

Select-O-Speed, no PTOReference

621

—

Four-speed, no PTO or 3-pointReference

631

—

Four-speed, no PTOReference

641

—

Four-speedReference

651

—

Five-speedReference

661

—

Five-speed, live PTOReference

671

—

Select-O-SpeedReference

681

—

Select-O-Speed, dual-speed PTOReference

3600

utilityReference

—

3600-N

narrowReference

—

3600-O

orchardReference

—

Engine

Engine (gross)

35.8 kWReference

36.1 kWReference

Engine (net)

33.6 kWReference

—

Drawbar (claimed)

25.4 kWReference

—

Drawbar (tested)

25.6 kWReference

20.0 kWReference

Displacement

2.9 LReference

2.4 LReference

Bore/Stroke

107 x 107 mmReference

90 x 91 mmReference

Power (net)

32.8 kWReference

—

Power (gross)

34.3 kWReference

31.8 kWReference

Air cleaner

dryReference

oil bathReference

Pre-heating

coolant heaterReference

—

Compression

7.75:1Reference

16.8:1Reference

Rated RPM

2000Reference

2200Reference

Torque

183.1 NmReference

171.9 NmReference

Torque RPM

1100Reference

1600Reference

Starter

electricReference

—

Starter volts

12Reference

Oil capacity

13.1 LReference

7.6 LReference

Coolant capacity

10.4 LReference

14.2 LReference

Power at rated engine speed

30.3 kWReference

23.5 kWReference

Max power

25.2 kWReference

19.0 kWReference

Belt (claimed)

—

23.9 kWReference

Plows

—

2 (14-inch)Reference

Emissions

—

Tier 0Reference

Firing order

—

1-2-4-3Reference

Sparkplug

—

14MMReference

Sparkplug gap

—

0.711 mmReference

Oil change

—

100 hReference

Transmission

Type

mechanical shuttleReference

full power shiftReference

Gears

6 forward and 4 reverseReference

10 forward and 2 reverseReference

Clutch

279mm dry discReference

hydraulic wet discReference

Transmission

Dual-RangeReference

Ford Select-O-SpeedReference

Oil type

—

M2C41Reference

PTO & Hydraulics

PTO (claimed)

29.8 kWReference

—

PTO (tested)

30.3 kWReference

25.6 kWReference

Hydraulic system

23.3 LReference

7.6 LReference

Capacity

23.3 LReference

7.6 LReference

Pressure

144.8 barReference

—

Pump flow

32.2 lpmReference

—

Rear Type

IReference

Control

top-link draft sensingReference

—

Rear lift

879 kgReference

567 kgReference

Rear PTO

liveReference

independentReference

Rear PTO Type

540 (1.375)Reference

540/1000Reference

Power at rated PTO speed

28.6 kWReference

19.6 kWReference

Total flow

—

15.1 lpmReference

Capacities

Fuel

49.2 LReference

Rear axle

—

7.6 LReference

Dimensions

Wheelbase

192 cmReference

—

Weight

3846 to 5590 poundsReference

1496 kgReference

Front tire

6.00-16Reference

Rear tire

12.4-28Reference

11-28Reference

Ag front

6.00-16Reference

Ag rear

12.4-28Reference

11-28Reference

Length

322 cmReference

—

Width

162 cmReference

—

Height (hood)

137 cmReference

—

Height (cab)

251 cmReference

—

Clearance (front axle)

54 cmReference

—

Clearance (rear axle)

33 cmReference

—

Front tread

132 to 203 cmReference

Rear tread

132 to 203 cmReference

132 to 193 cmReference

Shipping

1744 kgReference

—

Operating

2535 kgReference

—

Ballasted

3129 kgReference

—

Operating weight

—

1496 kgReference

Ballasted weight

—

2472 kgReference

Ford 3600 attachments

3600 Serial Numbers

1975

C450700Reference

—

1976

C490300Reference

—

1977

C527300Reference

—

1978

C560500Reference

—

1979

C595800Reference

—

1980

C635700Reference

—

1981

C660700Reference

—

Electrical

Ground

negativeReference

negative (12V)Reference

Charging system

alternatorReference

generatorReference

Charging amps

51Reference

20Reference

Battery volts

12Reference

12 (diesel)Reference

Gas Battery AH

77Reference

—

Diesel Battery AH

128Reference

—

Battery AH

—

135 (12V)Reference

Attachment overview

Test results

Fuel use

14.0 l/hourReference

8.3 l/hourReference

Max pull

2323 kgReference

1895 kgReference

Speeds

681 Serial Numbers

1957

—

1001Reference

1958

—

11977Reference

1959

—

58312Reference

1960

—

105943Reference

1961

—

131427Reference

1962

—

155531Reference

Location:

—

Transmission case, top left, behind the starter.Reference

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.