Compare/UTB/Universal S640 vs UTB/Universal U-651M

UTB/Universal S640 vs UTB/Universal U-651M

Verdict: UTB/Universal S640 vs UTB/Universal U-651M

The UTB/Universal S640 and the UTB/Universal U-651M are both tractors — here is how they stack up on the figures that matter. UTB/Universal U-651M leads on rated power with 65 hp against 62 hp. UTB/Universal S640 is the lighter machine (3,039 kg vs 3,660 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. UTB/Universal S640 is the newer design (1983 vs 1973). In short: choose the UTB/Universal U-651M for outright pulling power, or the UTB/Universal S640 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

Tune the fit score

Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

UTB/Universal

Fit score

Best match

Clear

UTB/Universal

Fit score

Best match

Clear

Rated power

62 hp

65 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

UTB/UniversalReference

liquid-cooledReference

With 14.00-38 rear tires.Reference

Drive

crawlerReference

—

Final drives

—

spur gearReference

Differential lock

—

mechanical rearReference

Variants

S640

standardReference

—

SM640

wide-trackReference

—

U640

wheeled tractorReference

—

U-650M

—

2WDReference

U-651M

—

4WDReference

Engine

Fuel tank

54.1 LReference

—

Engine

48.5 kWReference

Displacement

3.6 LReference

4.8 LReference

Bore/Stroke

102 x 110 mmReference

108 x 130 mmReference

Power

48.5 kWReference

Fuel system

direct injectionReference

Compression

17:1Reference

Rated RPM

2400Reference

1800Reference

Torque

221.0 NmReference

289.1 NmReference

Torque RPM

1400Reference

1250Reference

Starter

electricReference

Starter volts

12Reference

Starter power

3.0 kWReference

—

Firing order

—

1-3-4-2Reference

Transmission

Gears

6 forward and 2 reverseReference

10 forward and 2 reverseReference

Clutch

254mm dry discsReference

—

PTO & Hydraulics

PTO (claimed)

46.2 kWReference

—

Type

constant meshReference

gearReference

Pressure

170.7 barReference

118.0 barReference

Pump flow

22.0 lpmReference

40.1 lpmReference

Rear Type

II/IReference

IIReference

Rear lift

1297 kgReference

—

Rear PTO Type

540Reference

540 (1.375)Reference

Engine RPM

540@1970Reference

—

Rear PTO

—

independentReference

Dimensions

Wheelbase

152 cmReference

240 cmReference

Weight

3039 kgReference

3660 kgReference

Length

314 cmReference

392 cmReference

Front tire

—

7.50-20Reference

Rear tire

—

14-38Reference

Ag front

—

7.50-20Reference

Ag rear

—

14-38Reference

Width

—

189 cmReference

Height (steering wheel)

—

189 cmReference

Height (cab)

—

262 cmReference

UTB/Universal S640 attachments

Electrical

Charging system

alternatorReference

Battery volts

12Reference

Ground

—

negativeReference

Charging amps

—

36Reference

Charging volts

—

12Reference

Battery AH

—

53Reference

UTB/Universal S640 Tracks

S640 width

30 cmReference

—

SM640 width

36 cmReference

—

Speeds

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.