Compare/Ford 631 vs Ford 771

Ford 631 vs Ford 771

Verdict: Ford 631 vs Ford 771

The Ford 631 and the Ford 771 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 48 hp. Ford 631 is the lighter machine (1,506 kg vs 1,542 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Ford 771 is the newer design (1958 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.

Tune the fit score

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

The 12-speed adds a mechanical over/under to the basic four-speed transmission.Reference

dieselReference

Steering

power assist optionalReference

power assistReference

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

—

741

—

4-speedReference

771

—

Select-O-SpeedReference

Engine

Engine (gross)

36.1 kWReference

—

Belt (claimed)

23.9 kWReference

Plows

2Reference

2 (14-inch)Reference

Displacement

2.4 LReference

Bore/Stroke

90 x 91 mmReference

Emissions

Tier 0Reference

Power (gross)

31.8 kWReference

—

Air cleaner

oil bathReference

Compression

16.8:1Reference

7.5:1Reference

Rated RPM

2200Reference

Torque

171.9 NmReference

Torque RPM

1600Reference

Firing order

1-2-4-3Reference

Starter volts

12Reference

Coolant capacity

14.2 LReference

Sparkplug

14MMReference

Sparkplug gap

0.711 mmReference

Oil capacity

5.7 LReference

4.7 LReference

Oil change

100 hReference

Engine

—

36.1 kWReference

Power

—

36.1 kWReference

Transmission

Gears

12 forward and 3 reverseReference

10 forward and 2 reverseReference

Clutch

dry discReference

—

Oil type

SAE 80 Mild EPReference

—

Transmission

—

Ford Select-O-SpeedReference

Capacities

Fuel

49.2 LReference

Rear axle

7.6 LReference

—

PTO & Hydraulics

Hydraulic system

7.6 LReference

Type

unsynchronized gearReference

full power shiftReference

Capacity

7.6 LReference

Total flow

15.1 lpmReference

—

Rear Type

IReference

Control

position and draft controlReference

—

Rear lift

567 kgReference

Rear PTO

—

liveReference

Rear PTO Type

—

540Reference

Dimensions

Weight

1506 kgReference

1542 kgReference

Front tire

5.50-16Reference

6x16Reference

Rear tire

10-28Reference

11x28Reference

Ag front

5.50-16Reference

6x16Reference

Ag rear

11-28Reference

11x28Reference

Rear tread

121 to 193 cmReference

142 to 203 cmReference

Wheelbase

—

216 cmReference

Length

—

335 cmReference

Height

—

165 cmReference

Ground clearance

—

69 cmReference

Front tread

—

21 to 41 cmReference

631 Serial Number Location

631 Serial Numbers

1957

1001Reference

1958

11977Reference

1959

58312Reference

1960

105943Reference

1961

131427Reference

1962

155531Reference

Electrical

Ground

negative (12V)Reference

Charging system

generatorReference

Charging amps

20Reference

Battery volts

12 (diesel)Reference

Battery AH

135 (12V)Reference

771 Serial Numbers

Location:

—

The serial number on the Ford 771 is on the left side, behind the starter and on top of the transmission case.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.