Overview
The Nuffield PM-4 Universal is a gasoline-powered utility tractor manufactured in Birmingham, England, between 1950 and 1957. It features a Morris Motors 3.8L 4-cylinder liquid-cooled engine and a 5-speed gear transmission with an open operator station.
Ideal Applications
Tested Power Output:
According to Nebraska Tractor Test 559, the PM-4 Universal recorded a maximum belt power of 38.4 hp and a maximum drawbar pull of 5,216 lbs when operating in first gear.
Adjustable Tread Configuration:
The chassis is designed with a 78-inch wheelbase and adjustable tread widths, ranging from 52.8 to 70.9 inches for the front and 53.2 to 88.2 inches for the rear.
Mechanical Specifications:
The vehicle is equipped with manual steering, independent mechanical expanding band brakes, and an open center hydraulic system operating at 1,200 psi.
Production
| Description | Utility tractor / Built in Birmingham, England |
|---|---|
| Manufacturer | Nuffield |
Engine
| Aux. fuel | 1.8 gal (6.8 L) |
|---|---|
| Engine type | Morris Motors 3.8L 4-cyl gasoline |
| Fuel tank | 16.8 gal (63.6 L) |
| Air cleaner | oil bath |
| Bore/Stroke | 3.937x4.724 inches (100 x 120 mm) |
| Compression | 6:1 |
| Coolant capacity | 18 qts (17.0 L) |
| Description | Morris Motors / gasoline / 4-cylinder / liquid-cooled vertical L-head |
| Displacement | 230 ci (3.8 L) |
| Power | 40.8 hp (30.4 kW) |
| Rated RPM | 2000 |
| Starter volts | 12 |
| Torque | 226 lb-ft (306.5 Nm) |
| Torque RPM | 950 |
| Belt (claimed) | 43.5 hp (32.4 kW) |
| Belt (tested) | 38.4 hp (28.6 kW) |
| Drawbar (claimed) | 34.2 hp (25.5 kW) |
| Drawbar (tested) | 33.66 hp (25.1 kW) |
Transmission
| Clutch | 280mm dry disc |
|---|---|
| Gears | 5 forward and 1 reverse |
| Transmission type | 5-speed gear |
| Type | gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Manual steering / Independent mechanical expanding band brakes |
| Drive type | Two-wheel drive |
Hydraulics
| Pressure | 1200 psi (82.7 bar) |
|---|---|
| Type | open center |
PTO
| Engine RPM | 528@1400 |
|---|---|
| Rear PTO Type | 540 (1.375) |
Dimensions & Tires
| Ballasted weight | 7,765 lbs (3522 kg) |
|---|---|
| Clearance (drawbar) | 21.4 inches (54 cm) |
| Clearance (front axle) | 17 inches (43 cm) |
| Front tread | 52.8 to 70.9 inches (134 to 180 cm) |
| Ground clearance | 21 inches (at frame) (53 cm) |
| Height (exhaust) | 80.7 inches (204 cm) |
| Height (hood) | 59.5 inches (151 cm) |
| Length | 121.7 inches (309 cm) |
| Operating weight | 5,307 lbs (2407 kg) |
| Rear tread | 53.2 to 88.2 inches (135 to 224 cm) |
| Wheelbase | 78 inches (198 cm) |
| Front tire | 6.00-16 |
| Rear tire | 11.00-36 |
| Weight | 5,307 lbs (2407 kg) |
| Wheelbase | 78 inches (198 cm) |
| Ag front | 6.00-16 / 7.50-18 |
| Ag rear | 11.00-36 / 13.00-30 |
Nebraska Tractor Test 559
| Belt fuel use (max) | 3.9 gal/hour (14.8 l/hour) |
|---|---|
| Belt power (max) | 38.4 hp (28.6 kW) |
| Description | Gasoline 5-speed 2WDAugust 29 - September 8, 1955Link: Nebraska Tractor Test 559 file / Drawbar performance / Gear 3 used for power test. / Gear 1 used for pull test. |
| Max power | 33.66 hp (25.1 kW) |
| Max pull | 5216 lbs (2365 kg) |
References
| Description | The Nuffield Universal Tractor published in 1956 / The Nuffield Universal Tractor published in 1956 |
|---|
Variants
| DM3V | diesel tricycle |
|---|---|
| DM4 | diesel standard |
| PM3V | gasoline tricycle |
| PM4 | gasoline standard |