| Manufacturer | John Deere |
| Price | 30,942(USD) |
| Model | 6403 |
| Equipment Type | Utility Tractors |
| Factory | Saltillo, Mexico |
OCED TRACTOR TEST 1808
| Description | Diesel 9-speed 4WD September 10 - 23, 2002 Link: OCED Tractor Test 1808 file PTO performance Drawbar performance |
| Max power | 72.87hp / 54.3kW |
| Fuel use | 5.2gal/hour / 19.7l/hour |
| Power at rated engine speed | 86.77hp / 64.7kW |
| Power at rated PTO speed | 88.09hp / 65.7kW |
JOHN DEERE 6403 POWER
| Engine | 102hp / 76.1kW |
| PTO (claimed) | 85hp / 63.4kW |
| Drawbar (tested) | 72.87hp / 54.3kW |
| PTO (tested) | 89.43hp / 66.7kW |
ENGINE DETAIL
The John Deere 6403 features a turbocharged 4-cylinder diesel engine with a substantial displacement of 4.5L, delivering 102hp at an optimal rated RPM of 2100, ensuring efficient performance for agricultural tasks. Its high compression ratio of 17:1 enhances fuel efficiency and power output, while the 12-volt starter system provides reliable ignition in varying conditions. Maintenance considerations include a significant oil capacity of 13 quarts and coolant capacity of 14.3 quarts, essential for prolonged engine life and optimal thermal management during heavy operation.
| Description | John Deere turbocharged diesel 4-cylinder liquid-cooled |
| Displacement | 276ci / 4.5L |
| Bore/Stroke | 4.19x5.00inches / 106x 127mm |
| Power | 102hp / 76.1kW |
| Compression | 17:1 |
| Rated RPM | 2100 |
| Firing order | 1-3-4-2 |
| Starter volts | 12 |
| Oil capacity | 13qts / 12.3L |
| Coolant capacity | 14.3qts / 13.5L |
JOHN DEERE 6403 ENGINE
The John Deere 6403 features a robust 4.5L 4-cylinder diesel engine, providing reliable power for various agricultural tasks. With a fuel tank capacity of 41.7 gallons (157.8 liters), it offers extended operational time, reducing the frequency of refueling during extensive work periods. However, the engine's size may lead to higher emissions, and potential buyers should consider compliance with environmental regulations in their region.
| Description | John Deere 4.5L 4-cyl diesel |
| Fuel tank | 41.7gal / 157.8L |
TRANSMISSION
The John Deere 6403's partially synchronized Top Shaft Synchronized (TSS) transmission allows for seamless gear shifting between the 9 forward and 3 reverse speeds, enhancing operational efficiency. The requirement to stop the tractor for range changes can be a minor inconvenience but adds to the durability of the transmission. Operators in agricultural scenarios where frequent speed adjustments are needed might appreciate the smooth transitions, despite the stoppage for range shifts.
| Transmission | Top Shaft Synchronized (TSS) |
| Type | partially synchronized |
| Gears | 9 forward and 3 reverse |
| Clutch | 305mm cerametalic dry disc |
| Description | Three gears (1-3), plus reverse, (R) in three ranges (A-C). Gear shifts are synchronized. Tractor must be stopped to shift range |
MECHANICAL
The John Deere 6403 tractor, with its 4x2 2WD or 4x4 MFWD options, benefits from enhanced traction in diverse field conditions, particularly when using the mechanical rear differential lock for improved maneuverability. Its inboard planetary final drives offer efficient power transfer while reducing maintenance needs, though they may present challenges in terms of replacement costs if failures occur. The 9-speed partially synchronized transmission allows for smooth gear shifts, enhancing operator comfort, especially in varying applications, complemented by the optional Comfort Vantage Cab for improved ergonomics.
| Chassis | 4x2 2WD/4x4 MFWD 4WD |
| Final drives | inboard planetary |
| Differential lock | mechanical rear |
| Steering | power |
| Brakes | mechanical wet disc |
| Cab | Two-post folding ROPS. Comfort Vantage Cab optional |
| Transmission | 9-speed partially synchronized |
HYDRAULICS
| Type | open center |
| Pressure | 2750psi / 189.6bar |
| Rear valves | 2 or 3 |
| Pump flow | 12.1gpm / 45.8lpm |
| Total flow | 15gpm / 56.8lpm |
TRACTOR HITCH
| Rear Type | II |
| Control | mechanical lower-link draft sensing |
| Rear lift (at 24 | 4828lbs / 2189kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Clutch | dry disc |
| Rear RPM | 540/1000 |
| Engine RPM | 540@2100 / 1000@2100 |
JOHN DEERE 6403 TIRES
The John Deere 6403 tractor features standard agricultural tires with options for both front and rear configurations, providing versatility in various field conditions. The 10.00-16 front options offer improved maneuverability in tight spaces, while the larger 18.4-34 rear tires enhance stability and traction on uneven terrain. Consider potential challenges with tire wear on hard surfaces versus optimal performance in soft, muddy fields to maximize operational efficiency.
| Standard tires (ag) | Front: 10.00-16. Rear: 18.4-34 Front: 13.6-24. Rear: 18.4-34 |
DIMENSIONS
| 2WD Wheelbase | 91.3inches / 231cm |
| 4WD Wheelbase | 90.9inches / 230cm |
| 2WD Length | 162.4inches / 412cm |
| 4WD Length | 163.1inches / 414cm |
| Width | 73inches / 185cm (rear fenders) |
| Rear axle | Flanged: 65.8inch length / 1671mm |
| 2WD Front tread | 58.7 to 80.4inches / 149to 204cm |
| 4WD Front tread | 59.7 to 79.4inches / 151to 201cm |
| Rear tread | 59.5 to 79.4inches / 151to 201cm |
JOHN DEERE 6403 WEIGHT
| 2WD ROPS Shipping | 7695lbs / 3490kg |
| 4WD ROPS Shipping | 8130lbs / 3687kg |
| 2WD Cab Shipping | 8580lbs / 3891kg |
| 4WD Cab Shipping | 8987lbs / 4076kg |
| 4WD ROPS Operating | 8750lbs / 3969kg |
| Ballasted | 11515lbs / 5223kg |
JOHN DEERE 6403 HEIGHT
| Steering wheel | 80.3inches / 203cm |
| 2WD Hood | 68.3inches / 173cm |
| 4WD Hood | 67.9inches / 172cm |
| ROPS | 108.7inches / 276cm |
| Exhaust | 113.5inches / 288cm |
DIMENSIONS & TIRES
The John Deere 6403 offers both 2WD and 4WD configurations, with a wheelbase of 91.3 inches for 2WD and 90.9 inches for 4WD, enhancing stability in varied terrain. Its weight range of 7695 to 8987 pounds contributes to a robust build, suitable for heavy-duty agricultural tasks while the tire sizes (10.00-16 front and 18.4-34 rear) provide adequate traction and load capacity. However, operators should consider that the 2WD version may struggle in muddy conditions compared to the 4WD variant, which excels in traction and maneuverability.
| 2WD Wheelbase | 91.3inches / 231cm |
| 4WD Wheelbase | 90.9inches / 230cm |
| Weight | 7695 to 8987 pounds |
| Front tire | 10.00-16 |
| Rear tire | 18.4-34 |
6403 SERIAL NUMBERS
| Location | Serial number plate on the right side of the tractor frame, above the front axle |
| 2002 | 1339 |
| 2003 | 1557 |
| 2004 | 2129 |
| 2005 | 2621 |
| 2006 | 3762 |
| 2007 | 5342 |
ELECTRICAL
| Ground | negatve |
| Charging system | alternator |
| Charging amps | 65 |
| Battery CCA | 925 |
| Battery volts | 12 |