WhichTractor
  • Rigid chassis
  • WhichTractor size: Standard-size
  • No lab test on file
  • 1951–1957

WhichTractor size, not the maker’s category

Derived by WhichTractor from a sourced three-point linkage. How we decide what a machine is

Nuffield PM-4 specs: hp, weight, years

MORRIS-COMMERCIAL 38 T/V four-cylinder petrol. The manufacturer claimed 48.0 horsepower. No laboratory has tested one, so there is no measured figure at the shaft.

Engine power, claimed · gross or net not stated

48.0 hp

35.8 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”, claimed

This is the maker’s own figure, measured at the engine. Power at the PTO is lower — by how much, for this machine, nobody has measured.

Weight
4,546 lb
Hyd. flow
7.2 gpm
Top speed
17.4 mph

Nuffield PM-4 specs: key facts

  • The Nuffield PM-4 was built from 1951 to 1957.

  • The Nuffield PM-4 has a claimed engine power (gross or net not stated) of 35.8 kW (48.0 hp); it has no measured PTO figure.

  • The Nuffield PM-4 is two-wheel drive (2WD).

  • The Nuffield PM-4 has a MORRIS-COMMERCIAL 38 T/V engine, a 4-cylinder 3.77 L petrol unit.

  • The Nuffield PM-4 weighs 2,062 kg (4,546 lb) unladen.

  • The Nuffield PM-4 has a dependent rear PTO running at 540 rpm.

  • The hydraulic pump of the Nuffield PM-4 delivers 27.3 L/min (7.2 gpm).

Source · Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”

How does the PM-4 compare with its class?

  • Limitation:

    Five forward gears is low for its class — 38% below the median of 8 across the 314 machines within 10% of its power that hold this figure.

Derived by WhichTractor from 319 comparable records. How we work this out

Illustration of the 1951–1957 Nuffield PM-4, a 48 hp farm tractor, colour not recorded — shown unpainted, a drawing generated from its specification record
Illustration — not a photograph · colour not recorded — shown unpainted

How much horsepower does a PM-4 have?

The only figure for the PM-4 is 48.0 hp (35.8 kW) of claimed engine power, gross or net not stated, no test standard stated — not power at the shaft.

Engine, claimed (gross/net not stated)
48.0 hp

Source · Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”

What engine is in a PM-4?

A PM-4 has a MORRIS-COMMERCIAL 38 T/V, a 4-cylinder 3.77 L petrol engine.

Engine — PM-4 engine specifications
Make & modelMORRIS-COMMERCIAL 38 T/V
Cylinders4, liquid-cooled
Displacement230.1 ci · 3.77 L
Max torque148 lb·ft · 200 N·m @ 1,000 rpm
Electrical system12 V

Source · Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”

How much will a PM-4 lift, and what is its hydraulic flow?

Hydraulic and PTO specifications for the PM-4 are below.

Hydraulics & PTO — PM-4 hydraulics and PTO specifications
Pump flow7.2 gpm · 27.3 L/min
Hitch categoryCategory 1
Rear PTODependent, transmission-driven, 540 rpm @ 1,400 engine rpm
PTO shaft1 3/8"- 6 splines

Source · Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”

What transmission does a PM-4 have?

Transmission specifications for the PM-4 are below.

Transmission — PM-4 transmission specifications
ClutchPedal-operated dry single-plate clutch
BrakesPedal-operated drum brake acting on drive shafts
SteeringMechanical recirculating ball steering
Top speed17.4 mph · 28 km/h

Source · Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”

How much does a PM-4 weigh?

A PM-4 weighs 4,546 lb (2,062 kg) unladen.

Weights & dimensions — PM-4 weights and dimensions
Unladen weight4,546 lb · 2,062 kg
Wheelbase78.0 in · 1,981 mm
Length121.5 in · 3,086 mm
Width69.0 in · 1,753 mm
Height80.7 in · 2,051 mm
Ground clearance17.0 in · 432 mm
Front track52.8–71.3 in · 1,340–1,810 mm
Rear track53.0–77.0 in · 1,346–1,956 mm

Source · Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”

What oil does a PM-4 take, and how much?

A PM-4 engine takes 8.5 qt (8.0 L). Single source, not independently verified — always confirm against the operator’s manual for your machine.

PM-4 fluid capacities, grades and service intervals
SystemCapacity
Engine oil8.5 qt · 8.0 LSource: Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)” · single source, not independently verified
Transmission57.6 qt · 54.5 LSource: Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)” · single source, not independently verified
Cooling system18.0 qt · 17.0 LSource: Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)” · single source, not independently verified

Always confirm against the operator’s manual for your machine before service.

Which tractors compare with a PM-4?

Within 10% of its 33.9 hp at the PTO as the maker claimed it, with no laboratory test on file, the same type, and first built within 15 years of it.

Common questions about the Nuffield PM-4

Is a PM-4 two-wheel drive or four-wheel drive?

The Nuffield PM-4 is two-wheel drive (2WD).

What PTO does a PM-4 have?

A PM-4 has a dependent 540 rpm rear PTO on a 1 3/8"- 6 splines shaft.

Sources and how this page was built

Compiled from Traktorenlexikon, “Nuffield Universal PM 4 / Petrol (1948-1954)”.

Sources checked

14 SEP 2026

Spotted an error?

Sources

Facts taken from these documents, units converted. Numbers beside a figure refer to this list. Licences and attribution

  1. Traktorenlexikon: Nuffield Universal PM 4 / Petrol (1948-1954) — CC BY-SA 4.0, WIKIBOOKS-TL-116023 · revision 991975. Wikibooks contributors (Traktorenlexikon). Original document