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John Deere 7820 vs John Deere 8450

Verdict: John Deere 7820 vs John Deere 8450

The John Deere 7820 and the John Deere 8450 are both tractors — here is how they stack up on the figures that matter. John Deere 7820 leads on rated power with 189 hp against 187 hp. John Deere 7820 is the lighter machine (16,002 kg vs 27,560 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. John Deere 7820 is the newer design (2004 vs 1982). In short: choose the John Deere 7820 for outright pulling power, or the John Deere 8450 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 7820 Tractor
John Deere
94
Fit score
Best match
Clear
John Deere 8450 Tractor
John Deere
94
Fit score
Best match
Clear
Rated power
189 hp
187 hp
Confidence
98%
98%
Guide price
Overview
Manufacturer
John DeereReference
John DeereReference
Hydro-mechanical IVT controlled via right-hand speed lever and left-hand reverser lever. Knob on the speed lever adjusts the set speeds for two ranges. Minimum speed of 50 meters per hour (164 feet per hour). The IVT was available on the 7820 only when equipped with four-wheel drive.Reference
18.4-38 tiresReference
Final drives
inboard planetaryReference
Differential lock
electro-hydraulic front and rearReference
Engine
Engine (gross)
141.0 kWReference
Engine (net)
136.0 kWReference
Engine (max)
149.0 kWReference
Drawbar (tested)
107.0 kWReference
129.4 kWReference
Displacement
8.1 LReference
7.6 LReference
Bore/Stroke
116 x 129 mmReference
116 x 121 mmReference
Rated Power (net)
136.0 kWReference
Rated Power (gross)
141.0 kWReference
Maximum Power (net)
145.0 kWReference
Maximum Power (gross)
149.0 kWReference
Compression
16.5:1Reference
15.5:1Reference
Rated RPM
2100Reference
2100Reference
Idle RPM
875-2200Reference
Starter volts
12Reference
12Reference
Oil capacity
24.0 LReference
142.0 LReference
Coolant capacity
32.0 LReference
39.7 LReference
Max power
107.0 kWReference
129.4 kWReference
Power at rated engine speed
116.7 kWReference
139.4 kWReference
Engine
167.8 kWReference
Power
167.8 kWReference
Firing order
1-5-3-6-2-4Reference
Transmission
Transmission
AutoPowr IVTReference
Quad-RangeReference
Gears
infinite forward and reverseReference
16 forward and 6 reverseReference
PTO & Hydraulics
PTO (claimed)
115.6 kWReference
138.0 kWReference
PTO (tested)
130.0 kWReference
139.4 kWReference
Hydraulic system
107.9 LReference
141.9 LReference
Type
infinitely variable transmissionReference
partial power shiftReference
Capacity
107.9 LReference
141.9 LReference
Pressure
210.0 barReference
Valves
7Reference
2 to 4Reference
Pump flow
121.9 lpmReference
121.1 lpmReference
SCV flow
113.6 lpmReference
Rear Type
3/3NReference
3/3NReference
Rear lift
6350 kgReference
4201 kgReference
Rear PTO
independentReference
independentReference
Clutch
hydraulic wet discsReference
Perma-Clutch hydraulic wet discsReference
Rear PTO Type
1000 (1.75)Reference
1000 (1.75)Reference
Engine RPM
1000E@1750Reference
Front PTO
independentReference
Front PTO Type
1000 (1.75)Reference
Power at rated PTO speed
127.5 kWReference
Control
lower-link draft sensingReference
Capacities
Fuel
358.4 LReference
700.2 LReference
Front axle
14.4 LReference
99 by 3012 mmReference
Front hubs
1.9 LReference
HD Front hubs
3.8 LReference
Dimensions
Wheelbase
286 cmReference
317 cmReference
Weight
16002 to 17603 poundsReference
27560 to 29150 poundsReference
Front tire
11.00-16Reference
18.4-34Reference
Rear tire
18.4R42 (2WD)Reference
18.4-34Reference
Standard tires (ag)
Front: 14.9R30. Rear: 18.4R42 (4WD)Reference
Length
610 cmReference
567 cmReference
Width
299 cmReference
Height (cab)
318 cmReference
2WD Clearance (front axle)
65 cmReference
4WD Clearance (front axle)
56 cmReference
2WD Clearance (drawbar)
42 cmReference
4WD Clearance (drawbar)
41 cmReference
Rear axle
99 by 2997 mmReference
2WD Shipping
7258 kgReference
4WD Shipping
7757 kgReference
4WD IVT Shipping
7984 kgReference
Operating
7815 kgReference
Ag front
20.8-38Reference
Ag rear
20.8-38Reference
Shipping weight
12501 kgReference
Operating weight
13222 kgReference
Standard axle rear axle
100 by 2438 mmReference
Long axle rear axle
99 by 3012 mmReference
John Deere 7820 attachments
7820 Serial Number Location
Electrical
Ground
negativeReference
negativeReference
Charging system
alternatorReference
alternatorReference
Charging amps
150Reference
110Reference
Batteries
2Reference
2Reference
Battery CCA
925Reference
800Reference
Battery volts
12Reference
6Reference
Test results
Fuel use
36.0 l/hourReference
45.4 l/hourReference
Max pull
9813 kgReference
12050 kgReference
Speeds
John Deere 8450 attachments
8450 Serial Numbers
1982
1000Reference
1983
2000Reference
1984
3501Reference
1985
5001Reference
1986
5501Reference
1987
6001Reference
1988
6501Reference
Location:
Serial number plate on the rear of the tractor.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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