John Deere AR

Last Updated: July 2024

Overview

The John Deere AR is a vintage standard-tread tractor produced between 1935 and 1941. It features a two-cylinder all-fuel engine with a displacement of 321 cubic inches and a rated power output of 26.6 hp at 957 rpm. The tractor has an unsynchronized gear transmission with 4 forward and 1 reverse gears. According to independent test results, the AR achieved a maximum torque of 155 lb.-ft. at 957 rpm and a brake mean effective pressure of 79.7 psi. Its fuel efficiency was measured at 10.86 Hp.hr/gal at 1900 rpm. The drawbar performance showed a power of 23.34 hp at rated engine speed with a drawbar pull of 2967 lbs and a speed of 3.43 mph. The fuel consumption at maximum power was 2.55 gal/hr with a fuel efficiency of 0.656 lb/hp.hr.

Key Specifications

Category: Utility, Standard Tread

Power Output: 26.6

Transmission: Unsynchronized Gear

Drive Type: 2WD

Operating Weight: 4751

Fuel Type: All-fuel

John Deere AR vs. Similar Tractors

Power Output

Poor

Greater than 7% of similar tractors.

Operating Weight

Average

Greater than 42% of similar tractors.

Technical Specifications

Engine

Manufacturer: John Deere
Model: John Deere
Cooling Type: Liquid-cooled
Cylinder Orientation: -
Valve Configuration: -
Fuel Type: All-fuel
Induction Type: Naturally Aspirated
Cylinders: 2
Displacement (ci): 321.0
Bore (in): 5.51
Stroke (in): 6.73
Rated RPM: 957
Power Output (hp): 26.6

Transmission

Type: Unsynchronized Gear
Forward Gears: 4
Reverse Gears: 1
Total Gears: -

Dimensions

Length (in): 123.6
Width (in): 63.8
Height (in): 54.7
Operating Weight (lb): 4751

Power Take-Off (PTO)

PTO Type: Transmission
PTO Speed 1 (rpm): 540
PTO Speed 2 (rpm): -
PTO Speed 3 (rpm): -

Miscellaneous

Chassis: 4x2 2WD
Drive Type: 2WD
Steering Type: Manual
Coolant Capacity (qts): 32
Front Tire Diameter (in): 28
Front Tire Width (in): 6
Rear Tire Diameter (in): 42.75
Rear Tire Width (in): 10
Front/Rear Rim Diameter (in): -
Tire Type: Ag
Manufacture - End Year: 1941
Hitch Type: -
Hitch Category: -
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: Open
Starter Type: Electric
Brake Type: Mechanical Shoe
Hydraulic System Type: Powr-Trol

Test Results

Nebraska Tractor Test Laboratory - Test Date: January 1941

Maximum Power and Fuel Consumption

Maximum Power: 16.61 HP (12.39 kW) at 975 rpm
Fuel Consumption at Maximum Power: 3.08 Gal/hr (11.65 l/h) with a fuel efficiency of 0.485 lb/hp.hr (0.295 kg/kW.h)

Drawbar Performance

Power at Rated Engine Speed: 13.38 HP (9.98 kW) with a drawbar pull of 1236 lbs (5.50 kN) and a speed of 2.89 mph (4.65 km/h)
Fuel Consumption at Rated Speed: 0.596 lb/hp.hr (0.363 kg/kW.h) with a fuel efficiency of 11.21 Hp.hr/gal (2.21 kW.h/l)

Torque and Engine Performance

Maximum Torque: 109 lb.-ft. (148 Nm) at 975 rpm
Torque Rise: Not specified

Hydraulic Performance

Hydraulic Lift Capacity: Not applicable as the model might not be equipped with a hydraulic system

Overall Efficiency

Brake Mean Effective Pressure (BMEP): 79.7 psi (0.55 MPa)
Fuel Efficiency: 10.86 Hp.hr/gal (2.15 kW.h/l) at 1900 rpm

Nebraska Tractor Test Lab. (1941). Test 378: John Deere AR. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/52