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John Deere 40 vs John Deere AR Unstyled

Verdict: John Deere 40 vs John Deere AR Unstyled

The John Deere 40 and the John Deere AR Unstyled are both tractors — here is how they stack up on the figures that matter. John Deere AR Unstyled leads on rated power with 18 hp against 17 hp. John Deere AR Unstyled is the lighter machine (2,154 kg vs 2,900 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. John Deere 40 is the newer design (1953 vs 1935). In short: choose the John Deere AR Unstyled for outright pulling power, or the John Deere 40 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Fit & specs
John Deere 40 Tractor
John Deere
71
Fit score
Best match
Clear
John Deere AR Unstyled Tractor
John Deere
71
Fit score
Best match
Clear
Rated power
17 hp
18 hp
Confidence
98%
98%
Guide price
Overview
Manufacturer
John DeereReference
John DeereReference
All-fuel 4-speed standardJune 3 - 10, 1955Link: Nebraska Tractor Test 546 fileReference
Gear 1 used for pull test.Reference
Total built
18,000Reference
AR Total built
17,394Reference
AO Total built
2,686Reference
Variants
40C
tracked tractorReference
40H
high-cropReference
40S
standardReference
40T
tricycleReference
40V
specialReference
40U
utilityReference
40W
two-row utilityReference
A
Row-cropReference
AR
Standard front axleReference
AO
OrchardReference
AOS
narrow orchardReference
AW
Adjustable wide-frontReference
AN
Single front wheelReference
AH
High-cropReference
Engine
Fuel tank
39.7 LReference
Aux. fuel
3.4 LReference
3.8 LReference
Drawbar (claimed)
12.5 kWReference
13.4 kWReference
Belt (claimed)
15.8 kWReference
17.9 kWReference
Drawbar (tested)
16.2 kWReference
19.8 kWReference
Belt (tested)
18.1 kWReference
22.6 kWReference
Displacement
1.6 LReference
5.3 LReference
Bore/Stroke
102 x 102 mmReference
140 x 171 mmReference
Air cleaner
oil bathReference
oil bathReference
Compression
6.5:1Reference
4.45:1Reference
Rated RPM
1850Reference
975Reference
Firing order
1-2Reference
1-2Reference
Starter volts
6Reference
Oil capacity
4.7 LReference
10.4 LReference
Coolant capacity
13.2 LReference
30.3 LReference
Sparkplug gap
0.635 mmReference
0.762 mmReference
Point gap
0.559 mmReference
Intake valve clearance
0.305 mmReference
Exhaust valve clearance
0.305 mmReference
Belt power (max)
15.6 kWReference
22.6 kWReference
Max power
13.5 kWReference
19.8 kWReference
Plows
2Reference
Cooling system
thermo-siphonReference
Transmission
Type
gearReference
unsynchronized gearReference
Gears
4 forward and 1 reverseReference
4 forward and 1 reverseReference
Clutch
dry discReference
dry discReference
Transmission
John DeereReference
PTO & Hydraulics
Rear Type
IReference
Rear PTO
transmissionReference
transmissionReference
Rear PTO Type
540Reference
540Reference
Hydraulic system
7.9 LReference
Capacity
7.9 LReference
Valves
1Reference
Pump flow
33.7 lpmReference
Dimensions
Weight
2900 to 3220 poundsReference
2154 kgReference
Front tire
5.00-15Reference
28x6Reference
Rear tire
9-24Reference
42.75x10Reference
Ag front
6.00x16Reference
6.00-16Reference
Ag rear
11-38 (40H)Reference
12-26Reference
Length
291 cmReference
314 cmReference
Height
142 cmReference
Front tread
99 to 137 cmReference
121 cmReference
Rear tread
98 to 137 cmReference
131 cmReference
40S Operating
1315 kgReference
40T Operating
1460 kgReference
40S Ballasted
1900 kgReference
40T Ballasted
2065 kgReference
Height (hood)
139 cmReference
Operating weight
2154 kgReference
Ballasted weight
2880 kgReference
Rear axle
69 mmReference
John Deere 40 attachments
40 Serial Number Location
40 Serial Numbers
1953
60001 (Utility)Reference
282351 (Styled)Reference
1954
60001 (Hi-Crop)Reference
1955
60060 (Hi-Crop)Reference
Links
Capacities
Diameter
23 cmReference
32 cmReference
Width
140 cmReference
162 cmReference
RPM
1267Reference
975Reference
Speed
916.23 meters/minReference
996.70 meters/minReference
Fuel
60.6 LReference
Electrical
Ground
positiveReference
positiveReference
Battery volts
6Reference
6Reference
Attachment overview
Test results
Belt fuel use (max)
7.9 l/hourReference
11.7 l/hourReference
Max pull
1138 kgReference
1926 kgReference
AR Serial Number Location
AR Serial Numbers
1935
250000 (Unstyled)Reference
1936
251486 (Unstyled)Reference
1937
253521 (Unstyled)Reference
1938
255416 (Unstyled)Reference
1939
256700 (Unstyled)Reference
1940
257647 (Unstyled)Reference
1941
260000 (Unstyled)Reference
1942
261125 (Unstyled)Reference
1943
262157 (Unstyled)Reference
1944
262755 (Unstyled)Reference
1945
264198 (Unstyled)Reference
1946
265535 (Unstyled)Reference
1947
266643 (Unstyled)Reference
1948
268410 (Unstyled)Reference
1949
270131 (Unstyled)Reference
1950
272000 (Styled)Reference
1951
275938 (Styled)Reference
1952
278700 (Styled)Reference
Final
284074 (Styled)Reference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.

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