Challenger MT645B

The Challenger MT645B is a tractor produced by Challenger. It is equipped with a 449 ci 7.4 L engine. The listed engine power is Diesel (listed): 235 hp / 175.2 kW. Transmission: TechStar. Operating weight: 18308 to 19595 pounds.

Engine Power

Diesel (listed): 235 hp / 175.2 kW

Fuel & Capacities

159 gal 601.8 L

Transmission

TechStar

Operating Weight

18308 to 19595 pounds

Overview

	2005 - 2008 MT600B SeriesRow-Crop tractor MT600B Series Row-Crop tractor

Production
Manufacturer	Challenger (a part of AGCO)
Row-Crop tractor
Built in Beauvais, France

Challenger MT645B Engine
Sisu 7.4L 6-cyl diesel
Engine details ...

Challenger MT645B Transmission
continuously variable transmission (CVT)
Transmission details ...

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
Performance test details ...

Mechanical
Four-wheel drive
Final drives	inboard planetary
Differential lock	electrohydraulic front and rear
Power steering
Hydraulic wet disc brakes
Trailer brakes	hydraulic OptOptional
Cab standard with heat and A/C. Optional pneumatic cab suspension and automatic climate control.

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

Hydraulics
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

Tractor hitch
Rear Type	III
Rear lift (at 24"/610mm)	15,600 lbs 7076 kg
Front Hitch	II OptOptional
Front lift	7,700 lbs 3492 kg
	12,100 lbsOptOptional 5488 kg

Power Take-off (PTO)
Rear PTO	independent
Clutch	electro-hydraulic wet disc
Rear PTO Type	540 (1.375)
	540/540E OptOptional
	1000 (1.375)
	1000 (1.75)
Engine RPM	540@2037
	540E@ 1598
	1000@2031

Dimensions & Tires
Wheelbase	121.1 inches 307 cm
Weight	18308 to 19595 pounds
Front tire	380/85R34
Rear tire	480/80R46
Full dimensions and tires ...

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

References

Challenger MT600B Seires published in 2005, by AGCO
Challenger MT600B Product Information Guide published in 2005, by AGCO
Challenger Specialty Wheel Tractors published in 2007

Engine

Engine Detail — 449 ci / 7.4 L Diesel

Manufacturer	Sisu 74ETA
Configuration	turbocharged diesel, 6-cylinder 24-valve, liquid-cooled vertical inline
Displacement	449 ci 7.4 L
Bore/Stroke	4.251x5.278 inches 108 x 134 mm
Power	235 hp 175.2 kW
Air cleaner	dual paper elements
Pre-heating	1000W coolant heater OptOptional
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

Transmission

Transmission — TechStar

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

Dimensions

Challenger MT645B Tires
Ag front	380/85R34
Ag rear	480/80R46

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
Bar rear axle	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

Tests

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

Photos

Challenger MT645B

Recommended Implements & Sizing Guide

Engineering recommendations for Challenger MT645B based on its 235 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	8+ Bottom On-Land Hitch8+ 铧重型机外牵引犁	Commercial / Field Scale	High horsepower articulated/4WD field plowing.
Rotary Cutter / MowerMowing & Clearing	15 to 20 ft Batwing4.6 - 6.1 m 宽幅折叠翼	Commercial / Field Scale	Large commercial field and roadside mowing operations.
Rotary TillerSeedbed Prep	90 to 120 in Heavy Duty230 - 300 cm 重型旋耕机	Commercial / Field Scale	Deep intensive seedbed preparation for commercial row crops.
Disc HarrowSecondary Tillage	24 to 36 ft Heavy Duty Field Disc7.3 - 11.0 m 超宽重型整地耙	Commercial / Field Scale	Broad-acre grain tillage for high-drawbar tractors.
Hay BalerHay & Forage	Large Square Baler (3x4 or 4x4)大方捆商用打捆机 (1.2x1.2 m)	Commercial / Field Scale	High-capacity commercial forage harvesting (1000 RPM PTO).

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Challenger MT645B.

Estimated Continuous Field Runtime: 13 hrs

Approximately 13 hours of continuous field operation at ~75% rated power on a full tank (159 gal / 601.9 L).

Estimated 75% Load Fuel Burn~12.2 gal/hr (46.3 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours