The John Deere 6603 tractor is powered by a John Deere 6.8L 6-cyl diesel engine that provides 112hp / 83.5kW of horsepower and torque. It has a 4x2 2WD/4x4 MFWD 4WD drive configuration and a partially synchronized transmission.

Engine

The engine is a John Deere 6068T turbocharged diesel 6-cylinder liquid-cooled with a displacement of 414ci / 6.8L and a bore/stroke of 4.19x5.00inches / 106x 127mm. It has a power output of 112hp / 83.5kW and a compression ratio of 17:1. The engine has a rated RPM of 2100 and a firing order of 1-5-3-6-2-4. The starter volts are 12 and the starter power is 4.2hp / 3.1kW. The engine has an oil capacity of 20qts / 18.9L and a coolant capacity of 19.5qts / 18.5L. The intake valve clearance is 0.013inches / 0.330mm and the exhaust valve clearance is 0.017inches / 0.432mm.


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Transmission

The transmission is a partially synchronized Top Shaft Synchronized (TSS) with 9 forward and 3 reverse gears. The clutch is a 305mm cerametalic dry disc. The transmission has three gears (1-3), plus reverse, (R) in three ranges (A-C). Gear shifts are synchronized. The tractor must be stopped to shift range. The engine has a power take-off (PTO) output of 95hp / 70.8kW. The transmission is designed to work with the engine to provide the necessary power and torque to the wheels. The transmission is an essential component of the tractor that ensures smooth and efficient operation.

Brakes

The brakes are mechanical wet disc brakes. They are designed to provide reliable and consistent stopping power. The brakes are an essential safety feature of the tractor. The John Deere 6603 has a mechanical rear differential lock. The final drives are inboard planetary. The chassis is available in 4x2 2WD/4x4 MFWD 4WD. The steering is power-assisted. The cab is a two-post folding ROPS. Comfort Vantage Cab is optional. The brakes work in conjunction with the transmission and engine to provide the necessary stopping power.



Steering

The steering is power-assisted and is designed to provide precise and responsive control of the tractor. The John Deere 6603 has a fuel tank capacity of 41.7gal / 157.8L. The steering is an essential component of the tractor that ensures safe and efficient operation. The steering is designed to work in conjunction with the brakes, transmission, and engine to provide the necessary control and maneuverability.


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Common Problems

Users have reported issues with the transmission, particularly with the 9-speed partially synchronized transmission. Some users have also reported issues with the chassis, final drives, and differential lock. The cab has been reported to be uncomfortable for some users. The brakes have been reported to wear out quickly. Some users have also reported issues with the power steering. However, these issues are not common and can be resolved with proper maintenance and care.

What Users Like

Users appreciate the power and torque of the John Deere 6603. The tractor is also praised for its reliability and durability. Users like the fuel efficiency of the tractor and the ease of maintenance. The tractor is also praised for its versatility and ability to handle a variety of tasks. Users appreciate the comfortable ride and the ease of use of the tractor. The standard tires (ag) are also appreciated for their durability and traction on a variety of terrains.

John Deere 6603 Technical Specifications

Power

Engine112hp / 83.5kW
Pto (claimed)95hp / 70.8kW

Engine Detail

DescriptionJohn Deere 6068T turbocharged diesel 6-cylinder liquid-cooled
Displacement414ci / 6.8L
Bore/stroke4.19x5.00inches / 106x 127mm
Power112hp / 83.5kW
Compression17:1
Rated Rpm2100
Firing Order1-5-3-6-2-4
Starter Volts12
Starter Power4.2hp / 3.1kW
Oil Capacity20qts / 18.9L
Coolant Capacity19.5qts / 18.5L
Intake Valve Clearance0.013inches / 0.330mm
Exhaust Valve Clearance0.017inches / 0.432mm

Engine

DescriptionJohn Deere 6.8L 6-cyl diesel
Fuel Tank41.7gal / 157.8L

Transmission

TransmissionTop Shaft Synchronized (TSS)
Typepartially synchronized
Gears9 forward and 3 reverse
Clutch305mm cerametalic dry disc
Oil Capacity61.2qts / 57.9L
DescriptionThree gears (1-3), plus reverse, (R) in three ranges (A-C). Gear shifts are synchronized. Tractor must be stopped to shift range

Mechanical

Chassis4x2 2WD/4x4 MFWD 4WD
Final Drivesinboard planetary
Differential Lockmechanical rear
Steeringpower
Brakesmechanical wet disc
CabTwo-post folding ROPS. Comfort Vantage Cab optional
Transmission9-speed partially synchronized

Tires

Standard Tires (ag)Front: 10.00-16. Rear: 18.4-38 Front: 14.9-24. Rear: 18.4-38

Dimensions

2wd Wheelbase104.1inches / 264cm
4wd Wheelbase103.8inches / 263cm
2wd Length175inches / 444cm
4wd Length171.6inches / 435cm
Width73inches / 185cm (rear fenders)
Ground Clearance18inches / 45cm
Rear AxleFlanged: 65.8inch length / 1671mm
2wd Front Tread58.7 to 80.4inches / 149to 204cm
4wd Front Tread63.6 to 79.4inches / 161to 201cm
Rear Tread59.5 to 79.4inches / 151to 201cm

Dimensions And Tires

2wd Wheelbase104.1inches / 264cm
4wd Wheelbase103.8inches / 263cm
Weight8776 to 10252 pounds
Front Tire10.00-16
Rear Tire18.4-38

Serial Numbers

LocationSerial number plate on the right side of the tractor frame, above the front axle
20021228
20031486
20041908
20052363
20063178
20073986

Hydraulics

Typeopen center
Pressure2750psi / 189.6bar
Rear Valves2 or 3
Pump Flow15gpm / 56.8lpm
Total Flow15gpm / 56.8lpm

Tractor Hitch

Rear TypeII
Controlmechanical lower-link draft sensing
Rear Lift (at Ends)5,292lbs / 2400kg
Rear Lift (at 244828lbs / 2189kg

Electrical

Groundnegative
Charging Systemalternator
Charging Amps65
Battery Cca925
Battery Volts12

Power Take Off Pto

Rear Ptoindependent
Clutchdry disc
Rear Rpm540/1000
Engine Rpm540@2100 / 1000@2100

Weight

2wd Rops Shipping8776lbs / 3980kg
4wd Rops Shipping9361lbs / 4246kg
2wd Cab Shipping9658lbs / 4380kg
4wd Cab Shipping10252lbs / 4650kg

Height

Steering Wheel82.3inches / 209cm
Hood70inches / 177cm
Rops110.7inches / 281cm
Cab78inches / 198cm
Exhaust118inches / 299cm

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