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Nuffield

Nuffield PM-4 Universal

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.
Power-
Founded-
ModelPM-4
Nuffield PM-4 Universal tractor
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Technical Specifications

Detailed specifications and technical data for Nuffield PM-4 Universal

Power
Engine power40.8 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 rear11.00-36, 13.00-30, 14.00-30, 9.00-36
Ag front6.00-16, 7.50-18
Engine
Typegasoline
Power40.8 hp (30.4 kW)
Torque226 lb-ft (306.5 Nm)
Coolingliquid-cooled vertical L-head
Aux. fuel1.8 gal (6.8 L)
Cylinders4-cylinder
Fuel tank16.8 gal (63.6 L)
Rated RPM2000
Torque RPM950
Air cleaneroil bath
Bore/Stroke3.937x4.724 inches (100 x 120 mm)
Displacement230 ci (3.8 L)
ManufacturerMorris Motors
Starter volts12
Coolant capacity18 qts (17.0 L)
Compression ratio6:1
Variants
DM4diesel standard
PM4gasoline standard
DM3Vdiesel tricycle
PM3Vgasoline tricycle
Dimensions
Length121.7 inches (309 cm)
Wheelbase78 inches (198 cm)
Rear tread53.2 to 88.2 inches (135 to 224 cm)
Front tread52.8 to 70.9 inches (134 to 180 cm)
Height (hood)59.5 inches (151 cm)
Ballasted weight7,765 lbs (3522 kg)
Ground clearance21 inches (at frame) (53 cm)
Height (exhaust)80.7 inches (204 cm)
Operating weight5,307 lbs (2407 kg)
Clearance (drawbar)21.4 inches (54 cm)
Clearance (front axle)17 inches (43 cm)
Hydraulics
Typeopen center
Pressure1200 psi (82.7 bar), 2000 psi (137.9 bar) (1955 onward)
Mechanical
DriveTwo-wheel drive
BrakesIndependent mechanical expanding band brakes
SteeringManual steering
Operator stationOpen operator station
Production
TypeUtility tractor
Built inBirmingham, England
Years produced1950 - 1957
Transmission
Typegear
Gears5 forward and 1 reverse
Clutch280mm dry disc
Power Take-off (PTO)
Engine RPM528@1400
Rear PTO Type540 (1.375)

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