Tractor · 1957Unverified
Ford 661
Ford 661 — 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
Weight
1506 kg
Hover a source tag to verify
Overview
ManufacturerFordReference
Utility tractorReference
Built in Highland Park, Michigan, USAReference
Original price was $3,222 in 1961Reference
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
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
Transmission
5-speed gearReference
TypegearReference
Gears5 forward and 1 reverseReference
Clutch228.6mm dry discsReference
Oil capacity5.7 LReference
Oil typeSAE 80 Mild EPReference
Capacities
Fuel49.2 LReference
Rear axle7.6 LReference
PTO & Hydraulics
Hydraulic system7.6 LReference
Typeopen centerReference
Capacity7.6 LReference
Total flow15.1 lpmReference
Rear TypeIReference
Controlposition and draft controlReference
Rear lift567 kgReference
Rear PTOliveReference
Rear PTO Type540 (1.375)Reference
Dimensions
Weight1506 kgReference
Front tire5.50-16Reference
Rear tire11-28Reference
Ag front5.50-16Reference
Ag rear11-28Reference
Front tread132 to 203 cmReference
Rear tread132 to 193 cmReference
661 Serial Number Location
Transmission case, top left, behind the starter.Reference
661 Serial Numbers
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
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.