Challenger MT645B

Challenger MT645B Row-Crop tractor Technical Specifications

Challenger MT645B is a Row-Crop tractor that was produced by the John Deere between 2005 – 2008.

Below you will find detailed technical specifications for Challenger MT645B covering engine types, horsepower ratings, weight, height, fuel type and tank volume, oil capacity and type, hydraulic system diagram, wiring diagram, battery specs, etc.

Challenger MT645B Production

Manufacturer: Challenger (a part of AGCO)
Type: Row-Crop tractor
Factory: Beauvais, France

Challenger MT645B Power

Engine: 235 hp
175.2 kW
PTO (claimed): 200 hp
149.1 kW
Drawbar (tested): 172.30 hp
128.5 kW
PTO (tested): 222.9 hp
166.2 kW

Challenger MT645B Electrical

Ground: negative
Charging system: alternator
Charging amps: 150
Batteries: 2
Battery CCA: 775
Battery volts: 12

Challenger MT645B Mechanical

Chassis: 4×4 MFWD 4WD
Final drives: inboard planetary
Differential lock: electrohydraulic front and rear
Steering: power
Brakes: hydraulic wet disc
Trailer brakes: hydraulic*Optional
Cab: Cab standard with heat and A/C. Optional pneumatic cab suspension and automatic climate control.
Transmission: continuously variable transmission (CVT)


Fuel: 159 gal
601.8 L
Hydraulic system: 26.4 gal
99.9 L


Type: pressure flow compensated (PFC)
Capacity: 26.4 gal
99.9 L
Pressure: 2900 psi
200.0 bar
Valves: 4 to 6
Total flow: 39 gpm
147.6 lpm

Tracktor Hitch

Rear Type: III
Rear lift (at 24″/610mm): 15,600 lbs
7076 kg
Front Hitch: II*Optional
Front lift: 7,700 lbs
3492 kg
  12,100 lbs
5488 kg *Optional

Power Take-off (PTO)

Rear PTO: independent
Clutch: electro-hydraulic wet disc
Rear RPM: 540 (1.375)
  1000 (1.375)
  1000 (1.75)
Engine RPM: 540@2037
540E@ 1598

Challenger MT645B Engine detail

Engine Detail
Sisu 74ETA
turbocharged diesel
6-cylinder 24-valve
liquid-cooled vertical inline
Displacement: 449 ci
7.4 L
Bore/Stroke: 4.251×5.278 inches
108 x 134 mm
Power: 235 hp
175.2 kW
Air cleaner: dual paper elements
Pre-heating: 1000W coolant heater (optional)
Compression: 17.5:1
Rated RPM: 2200
Starter volts: 12
Oil capacity: 20 qts
18.9 L
Coolant capacity: 35.6 qts
33.7 L

Challenger MT645B Transmission overview

Engine Oil

Transmission: TechStar
Type: continuously variable transmission (CVT)
Gears: infinite (2-range) forward and reverse
Oil capacity: 70.8 qts
67.0 L

Challenger MT645B Dimensions

Wheelbase: 121.1 inches
307 cm
Length: 206 inches
523 cm
Width: 118 inches
299 cm
Height (cab): 123.6 inches
313 cm
Ground clearance: 22.4 inches
56 cm
Rear axle: Bar: 4.33 by 118 inches
109 by 2997 mm
Rear tread: 60 to 88 inches
152 to 223 cm

Challenger MT645B Weight
Shipping: 18,308 lbs
8304 kg
Operating: 19,595 lbs
8888 kg
Max Drawbar: 5620 lbs
2549 kg
Max front axle: 10861 lbs
4926 kg
Max rear axle: 17044 lbs
7731 kg

Challenger MT645B Tests

OCED Tractor Test 1876

OCED Tractor Test 1876
Diesel CVT 4WD
April 12 – 20, 2006
Link: OCED Tractor Test 1876 file
PTO performance
Max power: 222.9 hp
166.2 kW
Fuel use: 11.8 gal/hour
44.7 l/hour
Power at rated engine speed: 204.79 hp
152.7 kW
Fuel use: 12.1 gal/hour
45.8 l/hour
Power at rated PTO speed: 221.55 hp
165.2 kW
Fuel use: 12.0 gal/hour
45.4 l/hour
Drawbar performance
Max power: 172.30 hp
128.5 kW
Fuel use: 12.0 gal/hour
45.4 l/hour
Pull at 9.6 KPH
Max pull: 16,954 lbs
7690 kg
Pull at 10 KPH


Is Challenger MT645B a good tractor?

The Challenger MT645B is one of the great tractors in the Challenger (a part of AGCO) stable, and it has earned Challenger (a part of AGCO) a fantastic reputation.

How much oil does a Challenger MT645B take?

Check out the Challenger MT645B 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 Challenger (a part of AGCO) made the MT635B

The Challenger MT645B was an agricultural tractor model made from 2005 – 2008

Leave a Comment