Big Bud 400/20

Big Bud 400/20 Four-wheel Drive (4WD) tractor Technical Specifications

Big Bud 400/20 is a Row-Crop tractor that was produced by the John Deere between 1979 – 1981.

Below you will find detailed technical specifications for Big Bud 400/20 covering engine types, horsepower ratings, weight, height, fuel type and tank volume, oil capacity and type, hydraulic system diagram, wiring diagram, battery specs, etc.

Big Bud 400/20 Production

Manufacturer: Big Bud
Type: Four-wheel Drive (4WD) tractor
Factory: Havre, Montana, USA
Original price: $109,000 (1978 )

Big Bud 400/20 Electrical

Ground: negative
Charging system: alternator
Charging amps: 75
Battery volts: 12

Big Bud 400/20 Mechanical

Chassis: 4×4 articulated 4WD
Final drives: planetary
Steering: articulated power
Brakes: pneumatic drum
Cab: Cruiser Cab standard with air-conditioning.
Transmission: 12-speed gear


Type: closed center load sensing
Valves: 4
Pump flow: 36 gpm
136.3 lpm
Steering flow: 35 gpm
132.5 lpm

Big Bud 400/20 Engine detail

Engine Detail
Detroit Diesel 8V-92T
turbocharged diesel
Displacement: 736 ci
12.1 L
Bore/Stroke: 4.84×5.00 inches
123 x 127 mm
Power: 400 hp
298.3 kW
Compression: 19:1
Rated RPM: 2100
Starter: electric
Starter volts: 24

Big Bud 400/20 Transmission overview

Engine Oil

Transmission: Fuller Roadranger RT 12513
Type: gear
Gears: 12 forward and 2 reverse

Big Bud 400/20 Dimensions

Wheelbase: 150 inches
381 cm
Length: 267.6 inches
679 cm
Width: 120 inches
304 cm
Height (cab): 144.5 inches
367 cm
Height (exhaust): 156 inches
396 cm
Shipping weight: 40000 lbs
18144 kg
Max weight: 50000 lbs
22680 kg
Ground clearance: 14.5 inches
36 cm


Is Big Bud 400/20 a good tractor?

The Big Bud 400/20 is one of the great tractors in the Big Bud stable, and it has earned Big Bud a fantastic reputation.

How much oil does a Big Bud 400/20 take?

Check out the Big Bud 400/20 oil capacity and oil type in the engine specs section as it may vary across the engines. Keep in mind, that older models might have their oil capacity increased over time. You may compare between the early and late oil capacity.

Do tractors have VIN numbers?

Every tractor has a VIN number. The number is usually engraved below the driver’s seat. Tractor manufacturers put the number in different places on the tractor body.

What was the last year Big Bud made the ?

The Big Bud 400/20 was an agricultural tractor model made from 1979 – 1981

Leave a Comment