JD 6420 Engine Specifications
Engine Model – 4045HL271 / 4045HL473
Engine power at rated engine speed – 81 kW (110 hp)
Max. torque at 1500 rpm – 470 Nm (346 lb-ft)
Number of cylinders – 4
Bore – 106.5 mm (4.19 in.)
Stroke – 127.0 mm (5.00 in.)
Displacement – 4530 cm3 (276 in3)
Firing order – 1-3-4-2
Fuel injection pump – Denso HPCR
Intake valve clearance – 0.35 mm (0.014 in.)
Exhaust valve clearance – 0.45 mm (0.018 in.)
Slow idle – 845 to 855 rpm
Fast idle – 2455 to 2465 rpm
Rated engine speed – 2300 rpm
Working speed range – 1500 to 2300 rpm
Engine speed 540 rpm rear PTO – 2143 rpm
Engine speed 1000 rpm front PTO with 6 splines – 2185 rpm
Max. PTO power at rated PTO speed – 72 kW (98 hp)
John Deere 6420 Transmission
SyncroPlus transmission – synchronized gears, mechanically actuated
Gear selections – 12 forward gears, 4 reverse gears
Power Reverser transmission – synchronized gears, mechanically actuated
Gear selections – 16 forward gears, 16 reverse gears
Actuation of reverse drive lever – mechanical/hydraulic, under load,
without operating the clutch
PowrQuad transmission – planetary gears, hydraulically actuated
Gear selections – 16 or 24 forward gears, 12, 16 or 24 reverse gears
Actuation of reverse drive lever – mechanical/hydraulic, under load,
without operating the clutch
PowrQuad Plus transmission – planetary gears, hydraulically actuated
Gear selections – 24 forward gears, 12, 16 or 24 reverse gears
Actuation of reverse drive lever – mechanical/hydraulic or
electrical/hydraulic, under load, no operating clutch
Clutch – electric/hydraulic
AutoPowr transmission – infinitely variable mechanical/hydraulic
transmission
Speed ranges – 0.05 – 40 km/h (0.03 – 25 mph) or 0.05 – 50 km/h (0.03 –
31 mph)
Change of direction of travel – electrical, under load, without
operating clutch
JD 6420 Hydraulic System
Type of Hydraulic System – Load-Sensing system with fixed-displacement
pump
Pump type – gear-type pump
System pressure min. (stand-by) / max – 1500 kPa (15 bar; 220 psi) /
20000 kPa (200 bar; 2900 psi)
Steering system – hydrostatic
JD 6420 Tires Index radius
13.6-28 – 610 mm (24.0 in.)
14.9-28 – 640 mm (25.2 in.)
13.6-38 – 772 mm (30.4 in.)
540/65-24 – 620 mm (24.4 in.)
280/85-28 – 560 mm (22.0 in.)
320/85-28 – 590 mm (23.2 in.)
340/85-28 – 610 mm (24.0 in.)
380/70-28 – 610 mm (24.0 in.)
380/85-28 – 640 mm (25.2 in.)
420/70-28 – 640 mm (25.2 in.)
480/65-28 – 640 mm (25.2 in.)
520/60-28 – 640 mm (25.2 in.)
John Deere 6420 Capacities
Fuel tank – 165 L (43.6 U.S.gal.) or 185 L (48.9 U.S.gal.)
Cooling system (engines without intercooler, tractors without cab) –
11.0 L (2.9 U.S.gal)
Cooling system (engines without intercooler, tractors with cab) – 13.5 L
(3.6 U.S.gal.)
Cooling system engine type designation includes the letter “H”) – 24.0 L
(6.3 U.S.gal)
Crankcase with filter – 16 L (4.2 U.S.gal.)
SyncroPlus transmission with 12/4 gears – 52 L (13.7 U.S.gal.)
Power Reverser with 16/16 gears – 52 L (13.7 U.S.gal.)
PowrQuad transmission with 16/16 or 16/12 gears – 49 L (12.9 U.S.gal.)
PowrQuad transmission with 24/24 or 24/16 gears – 50 L (13.2 U.S.gal.)
PowrQuad Plus transmission with 24/24 or 24/16 gears – 50 L (13.2
U.S.gal.)
AutoQuad Plus transmission with 24/24 or 24/16 gears – 50 L (13.2
U.S.gal.)
AutoPowr transmission – 60 L (15.9 U.S.gal.)
AutoPowr extra with creeper transmission – 1 L (0.3 U.S.gal.)
AutoPowr extra with front-wheel drive – 3 L (0.8 U.S.gal.)
AutoPowr extra with TLS axle – 3 L (0.8 U.S.gal.)
Front PTO – 3.5 L (0.9 U.S.gal.)
Front-wheel drive Axle housing – 6.5 L (1.7 U.S.gal.)
Front-wheel drive Final drives (without brake) – 0.6 L (0.2 U.S.gal.)
Front-wheel drive Final drives (with brake) – 0.9 L (0.3 U.S.gal.)
John Deere 6420 Loads and Weights
Max. permissible static vertical load
– on drawbar (transport pos., 250 mm; 9.8 in.) – 1600 kg (3525 lb.)
– on trailer hitch – 2000 kg (4410 lb.)
– on hook of pick-up hitch – 3000 kg (6615 lb.)
– on piton-fix – 3000 kg (6615 lb.)
– on ball-type tow hitch (transport) – 3000 kg (6615 lb.)
– on ball-type tow hitch (in field) – 4000 kg (8815 lb.)
Maximum permissible front axle load (without front-wheel drive)
– normal operation – 2050 kg (4520 lb.)
– front loader operation – 5000 kg (11025 lb.)
Maximum permissible front axle load (with front-wheel drive)
– normal operation (axle without brake) – 3800 kg (8375 lb.)
– normal operation (axle with brake) – 4200 kg (9260 lb.)
– front loader operation – 5800 kg (12790 lb.)
Maximum permissible rear axle load – 6500 kg (14325 lb.)
Maximum permissible total weight – 8200 kg (18075 lb.)