Nuffield PM-4 Universal

The Nuffield PM-4 Universal is a tractor produced by Nuffield. It is equipped with a 230 ci 3.8 L engine. The listed engine power is Gasoline (listed): 40.8 hp / 30.4 kW. Transmission: 5 forward and 1 reverse. Operating weight: 5,307 lbs 2407 kg.

Engine Power

Gasoline (listed): 40.8 hp / 30.4 kW

Fuel & Capacities

16.8 gal 63.6 L

Transmission

5 forward and 1 reverse

Operating Weight

5,307 lbs 2407 kg

Overview

	1950 - 1957 Utility tractor

Production
Manufacturer	Nuffield
Utility tractor
Built in Birmingham, England

Variants
PM4	gasoline standard
DM4	diesel standard
PM3V	gasoline tricycle
DM3V	diesel tricycle

Nuffield PM-4 Engine
Morris Motors 3.8L 4-cyl gasoline
Fuel tank	16.8 gal 63.6 L
Aux. fuel	1.8 gal 6.8 L
Engine details ...

Nuffield PM-4 Transmission
5-speed gear
Transmission details ...

Nuffield PM-4 Power
Engine	40.8 hp 30.4 kW
Drawbar (claimed)	34.2 hp 25.5 kW
Belt (claimed)	43.5 hp 32.4 kW
Drawbar (tested)	33.66 hp 25.1 kW
Belt (tested)	38.4 hp 28.6 kW
Performance test details ...

Mechanical
Two-wheel drive
Manual steering
Independent mechanical expanding band brakes
Open operator station.

Hydraulics
Type	open center
Pressure	1200 psi 82.7 bar
	2000 psi (1955 onward) 137.9 bar

Power Take-off (PTO)
Rear PTO Type	540 (1.375)
Engine RPM	528@1400

Dimensions & Tires
Wheelbase	78 inches 198 cm
Weight	5,307 lbs 2407 kg
Front tire	6.00-16
Rear tire	11.00-36
Full dimensions and tires ...

References

The Nuffield Universal Tractor published in 1956

Engine

Engine Detail — 230 ci / 3.8 L Gasoline

Manufacturer	Morris Motors
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled vertical L-head
Displacement	230 ci 3.8 L
Bore/Stroke	3.937x4.724 inches 100 x 120 mm
Power	40.8 hp 30.4 kW
Air cleaner	oil bath
Compression	6:1
Rated RPM	2000
Torque	226 lb-ft 306.5 Nm
Torque RPM	950
Starter volts	12
Coolant capacity	18 qts 17.0 L

Transmission

Transmission — 5 forward and 1 reverse gear

Type	gear
Gears	5 forward and 1 reverse
Clutch	280mm dry disc

Dimensions

Nuffield PM-4 Tires
Ag front	6.00-16
Ag rear	11.00-36
Ag front	7.50-18
Ag rear	13.00-30
	14.00-30
	9.00-36

Dimensions
Wheelbase	78 inches 198 cm
Length	121.7 inches 309 cm
Height (hood)	59.5 inches 151 cm
Height (exhaust)	80.7 inches 204 cm
Operating weight	5,307 lbs 2407 kg
Ballasted weight	7,765 lbs 3522 kg
Ground clearance	21 inches (at frame) 53 cm
Clearance (front axle)	17 inches 43 cm
Clearance (drawbar)	21.4 inches 54 cm
Front tread	52.8 to 70.9 inches 134 to 180 cm
Rear tread	53.2 to 88.2 inches 135 to 224 cm

Tests

Nebraska Tractor Test 559
Gasoline 5-speed 2WD August 29 - September 8, 1955 Link: Nebraska Tractor Test 559 file
Belt power (max)	38.4 hp 28.6 kW
Belt fuel use (max)	3.9 gal/hour 14.8 l/hour
Drawbar performance
Max power	33.66 hp 25.1 kW
Gear 3 used for power test.
Max pull	5216 lbs 2365 kg
Gear 1 used for pull test.

Photos

Nuffield PM-4 Universal tractor photo

Recommended Implements & Sizing Guide

Engineering recommendations for Nuffield PM-4 Universal based on its 40.8 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm)	Medium Duty	Standard utility farm tillage.
Rotary Cutter / MowerMowing & Clearing	6 ft (72 in)1.8 m	Medium Duty	Medium pasture clearing; rear slip-clutch recommended.
Rotary TillerSeedbed Prep	66 to 72 in165 - 180 cm	Medium Duty	Standard utility tiller; slip clutch protection required.
Disc HarrowSecondary Tillage	7 to 8 ft Tandem Disc2.1 - 2.4 m 对开双排耙	Medium Duty	Field leveling and clod breaking behind plows.
Hay BalerHay & Forage	Small Square Baler (14x18")小方捆打捆机 (36x46 cm)	Medium Duty	Classic 2-string baler for horse and small livestock hay.

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Nuffield PM-4 Universal.

Estimated Continuous Field Runtime: 7.9 hrs

Approximately 7.9 hours of continuous field operation at ~75% rated power on a full tank (16.8 gal / 63.6 L).

Estimated 75% Load Fuel Burn~2.1 gal/hr (8 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours