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Nuffield PM-4 Universal

Nuffield PM-4 Universal tractor
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The Nuffield PM-4 Universal is a utility tractor produced from 1950 to 1957 by Nuffield in Birmingham, England. It features a Morris Motors 3.8L 4-cylinder gasoline engine with 40.8 hp, a 5-speed gear transmission, and two-wheel drive. The tractor has an open operator station, manual steering, and independent mechanical expanding band brakes. It offers hydraulic open center system with pressures up to 2000 psi from 1955 onward and a rear PTO type 540. The PM-4 was available in several variants including gasoline and diesel versions, as well as tricycle configurations. It has a wheelbase of 78 inches and an operating weight of 5,307 lbs.
Nuffield PM-4Nuffield PM4utility tractor40 hp tractorMorris Motors engine5-speed transmissiontractor specifications
Power-
Founded-
ModelPM-4

Technical Specifications

Detailed specifications and technical data for Nuffield PM-4 Universal

Power

Engine power:40.8 hp (30.4 kW)
Belt (tested):38.4 hp (28.6 kW)
Belt (claimed):43.5 hp (32.4 kW)
Drawbar (tested):33.66 hp (25.1 kW)
Drawbar (claimed):34.2 hp (25.5 kW)

Tires

Ag rear:11.00-36, 13.00-30, 14.00-30, 9.00-36
Ag front:6.00-16, 7.50-18

Engine

Type:gasoline
Power:40.8 hp (30.4 kW)
Torque:226 lb-ft (306.5 Nm)
Cooling:liquid-cooled vertical L-head
Aux. fuel:1.8 gal (6.8 L)
Cylinders:4-cylinder
Fuel tank:16.8 gal (63.6 L)
Rated RPM:2000
Torque RPM:950
Air cleaner:oil bath
Bore/Stroke:3.937x4.724 inches (100 x 120 mm)
Displacement:230 ci (3.8 L)
Manufacturer:Morris Motors
Starter volts:12
Coolant capacity:18 qts (17.0 L)
Compression ratio:6:1

Variants

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

Dimensions

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

Hydraulics

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

Mechanical

Drive:Two-wheel drive
Brakes:Independent mechanical expanding band brakes
Steering:Manual steering
Operator station:Open operator station

Production

Type:Utility tractor
Built in:Birmingham, England
Years produced:1950 - 1957

Transmission

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

Power Take-off (PTO)

Engine RPM:528@1400
Rear PTO Type:540 (1.375)