Tractor · 1957Unverified
Ford 681
Ford 681 — 601 Workmaster Series · 48 hp. Reference specifications; pending source verification.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
48 hp
Max power
20.0 kW
Weight
1496 kg
Hover a source tag to verify
Overview
ManufacturerFordReference
Utility tractorReference
Built in Highland Park, Michigan, USAReference
Original price was $3,231 in 1961Reference
The Ford 681 was the tractor with the most features in the 601 Workmaster series. In addition to the Select-O-Speed transmission, the 681 had an independent dual-speed power take-off (PTO).Reference
Two-wheel driveReference
SteeringmanualReference
Steeringpower assist optionalReference
Differential mechanical expanding shoe brakesReference
Open operator station.Reference
Variants
611Select-O-Speed, no PTOReference
621Four-speed, no PTO or 3-pointReference
631Four-speed, no PTOReference
641Four-speedReference
651Five-speedReference
661Five-speed, live PTOReference
671Select-O-SpeedReference
681Select-O-Speed, dual-speed PTOReference
Engine
Ford 2.2L 4-cyl gasolineReference
Ford 2.4L 4-cyl dieselReference
Ford 2.2L 4-cyl LP gasReference
Engine (gross)36.1 kWReference
Belt (claimed)23.9 kWReference
Plows2 (14-inch)Reference
Drawbar (tested)20.0 kWReference
Ford EAE Red TigerReference
gasolineReference
4-cylinder 8-valveReference
liquid-cooled vertical inlineReference
Displacement2.2 LReference
Bore/Stroke87 x 91 mmReference
EmissionsTier 0Reference
Power (gross)36.1 kWReference
Air cleaneroil bathReference
Compression7.5:1Reference
Rated RPM2200Reference
Torque171.9 NmReference
Torque RPM1600Reference
Firing order1-2-4-3Reference
Starter volts6Reference
Coolant capacity14.2 LReference
Sparkplug14MMReference
Sparkplug gap0.635 mmReference
Sparkplug gap0.711 mmReference
Oil capacity4.7 LReference
Oil change100 hReference
FordReference
dieselReference
Displacement2.4 LReference
Bore/Stroke90 x 91 mmReference
Power (gross)31.8 kWReference
Compression16.8:1Reference
Starter volts12Reference
LP gasReference
Power at rated engine speed25.6 kWReference
Max power20.0 kWReference
Power at rated engine speed24.3 kWReference
Max power19.0 kWReference
Power at rated engine speed23.5 kWReference
Transmission
10-speed full power shiftReference
TransmissionFord Select-O-SpeedReference
Typefull power shiftReference
Gears10 forward and 2 reverseReference
Clutchhydraulic wet discReference
Oil capacity7.6 LReference
Oil typeM2C41Reference
PTO & Hydraulics
PTO (tested)25.6 kWReference
Hydraulic system7.6 LReference
Capacity7.6 LReference
Total flow15.1 lpmReference
Rear TypeIReference
Rear lift567 kgReference
Rear PTOindependentReference
Rear PTO Type540/1000Reference
Power at rated PTO speed21.1 kWReference
Power at rated PTO speed20.1 kWReference
Power at rated PTO speed19.6 kWReference
Capacities
Fuel49.2 LReference
Rear axle7.6 LReference
Dimensions
Weight1496 kgReference
Front tire6.00-16Reference
Rear tire11-28Reference
Ag front6.00-16Reference
Ag rear11-28Reference
Operating weight1496 kgReference
Ballasted weight2472 kgReference
Front tread132 to 203 cmReference
Rear tread132 to 193 cmReference
681 Serial Numbers
Location:Transmission case, top left, behind the starter.Reference
19571001Reference
195811977Reference
195958312Reference
1960105943Reference
1961131427Reference
1962155531Reference
FAQ: How to read a serial number table.Reference
Electrical
Groundpositive (6V)Reference
Groundnegative (12V)Reference
Charging systemgeneratorReference
Charging amps20Reference
Battery volts6 (gas/lp)Reference
Battery volts12 (diesel)Reference
Battery AH80 (6V)Reference
Battery AH135 (12V)Reference
Test results
NTTL 702: gasoline Select-O-Speed 2WDReference
NTTL 704: LP-gas Select-O-Speed 2WDReference
NTTL 706: diesel Select-O-Speed 2WDReference
Gasoline Select-O-Speed 2WDJune 11 - 20, 1959Link: Nebraska Tractor Test 702 fileReference
PTO performanceReference
Fuel use11.7 l/hourReference
Fuel use9.8 l/hourReference
Drawbar performanceReference
Fuel use10.6 l/hourReference
Gear 6 used for power test.Reference
Max pull1863 kgReference
Gear 4 used for pull test.Reference
LP-gas Select-O-Speed 2WDJune 18 - 25, 1959Link: Nebraska Tractor Test 704 fileReference
Fuel use15.1 l/hourReference
Fuel use12.1 l/hourReference
Fuel use13.6 l/hourReference
Max pull1900 kgReference
Diesel Select-O-Speed 2WDJune 20 - 26, 1959Link: Nebraska Tractor Test 706 fileReference
Fuel use9.1 l/hourReference
Fuel use7.2 l/hourReference
Fuel use8.3 l/hourReference
Max pull1895 kgReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.