John Deere 6068HF475 Specifications
| Engine Model: John Deere PowerTech 6068HF475 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 173-250 Hp (129-187 kW) at 2400 rpm |
| Fuel System Type: Common Rail Direct Injection |
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The John Deere 6068HF475 is a 6.8-liter, inline
6-cylinder diesel engine from the PowerTech E product family. This model
incorporates a High-Pressure Common-Rail (HPCR) fuel system with
electronic control, combined with turbocharging and air-to-air
aftercooling (ATAAC). Designed to meet EPA Tier 3 and EU Stage IIIA
emissions standards, the HF475 replaces older mechanically governed
units in industrial, generator drive, and agricultural machinery. The
engine provides a steep torque rise and variable speed capability
without sacrificing fuel efficiency.
The 6068HF475 represents a transition from mechanical to electronic
diesel control while retaining the robust wet-sleeve cylinder
architecture of earlier PowerTech engines. Its HPCR fuel system delivers
injection pressures up to 1600 bar, enabling quieter operation and
reduced particulate emissions compared to rotary pump predecessors. The
directed top-liner cooling system lowers ring zone temperatures,
extending overhaul intervals.
Users report reliable cold starting and stable governing under variable
electrical loads. Known concerns include injector driver module failures
at high hours and oil leaks from the front crankshaft seal. Overall, the
HF475 remains a preferred powerplant for loaders, combines, and prime
generator sets where electronic diagnostics are accessible.
Engine Family: John Deere PowerTech E.
Configuration: Inline 6-cylinder, 4-stroke diesel.
Displacement: 6.8 L (415 cu.in).
Bore x Stroke: 106 mm x 127 mm (4.17 in x 5.00 in).
Compression Ratio: 17.0:1.
Firing Order: 1-5-3-6-2-4.
Rotation (facing flywheel): Counterclockwise.
Aspiration: Turbocharged with air-to-air aftercooler (ATAAC).
Rated Power (Industrial): 173-250 hp (129-187 kW) at 2000-2400 rpm.
Rated Power (Generator, 60 Hz): 212-283 hp (158-211 kW) at 1800 rpm.
Rated Power (Generator, 50 Hz): 185-247 hp (138-184 kW) at 1500 rpm.
Peak Torque: 1023 Nm (754 lb-ft) at 1400 rpm.
Torque Rise: 35%.
Governed Speed (high idle, industrial): 2650 rpm.
Low idle speed: 850 rpm.
Emissions Standard: EPA Tier 3, EU Stage IIIA.
Material: Cast iron with deep-skirt design.
Cylinder Liners: Replaceable wet-sleeve.
Number of Cylinders: 6.
Bore Diameter: 106.00 mm (4.173 in).
Main Bearings: 7 main bearing caps (one between each cylinder).
Liner Protrusion (above block deck): 0.06-0.12 mm (0.0024-0.0047 in).
Block Features: Directed top-liner cooling passages integrated into the
upper block casting. The engine serial number is stamped on the left
side of the block adjacent to the injection pump mounting pad.
Material: Cast iron (single head for all 6 cylinders).
Valvetrain: Overhead valve with pushrods and forged steel rocker arms.
Valves per Cylinder: 4 (2 intake, 2 exhaust).
Total Valves: 24.
Valve Arrangement: Cross-flow (intake on right side, exhaust on left).
Valve Clearance (cold - intake): 0.36 mm (0.014 in).
Valve Clearance (cold - exhaust): 0.46 mm (0.018 in).
Valve Seat Angle (intake/exhaust): 45°.
System Type: High-Pressure Common-Rail (HPCR) electronically controlled.
Injection Pressure (maximum): 1600 bar (23,200 psi).
High-Pressure Pump: Bosch CP3 or Denso HP0 (2-piston radial plunger).
Fuel Rail Volume: 42 cm3 (internal) with pressure sensor and pressure
limiting valve.
Injectors: Solenoid-actuated 7-hole nozzle, flow rate 450-520 cm3 per 30
s at 100 bar.
Fuel Filter: Two-stage: primary (water separator, 30 micron) + secondary
(10 micron).
Fuel Priming: Electric lift pump (internal to HP pump on later builds)
or manual plunger.
Injection Timing: Variable by ECU (no static timing adjustment).
Return Fuel Flow: 60-80 L/h (15.8-21.1 gal/h) at rated speed.
System Type: Gear-type positive displacement pump with full-flow
filtration.
Oil Capacity (including filter): 19.0 L (20.0 US qt).
Oil Pressure (hot, rated speed): 310-450 kPa (45-65 psi).
Oil Pressure (low idle, hot): Minimum 100 kPa (15 psi).
Oil Specification: API CI-4, CJ-4 or CK-4; SAE 15W-40.
Oil Change Interval (industrial): 500 hours.
Oil Change Interval (generator standby): 750 hours or 12 months.
Oil Filter: Full-flow spin-on (John Deere RE61573) with integral bypass
valve.
Oil Pan Depth (standard front sump): 230 mm (9.1 in).
Oil Drain Plug Thread: M18 x 1.5.
System Type: Centrifugal water pump, thermostatically controlled,
pressurized.
Coolant Capacity (engine only, no radiator): 11.9 L (12.6 US qt).
Thermostat (opening temperature): 85°C (185°F).
Thermostat (full open): 98°C (208°F).
Water Pump Drive: Poly-vee belt with automatic tensioner.
Aftercooler Type: Air-to-air (ATAAC) - not coolant-based.
Coolant Specification: Ethylene glycol, 50/50 mix, low silicate.
Radiator Cap Pressure: 105 kPa (15 psi).
Fan Drive (standard): Viscous clutch fan, engagement temperature 93°C
(200°F).
Turbocharger: Fixed geometry with wastegate (Garrett GT32 or BorgWarner
S300). Compressor outlet to aftercooler ducting included.
Electrical System (standard): 12 V / 120 A alternator.
Electrical System (optional): 24 V / 60 A alternator.
Starter Motor: 4.0 kW (12 V) or 4.5 kW (24 V), pinion teeth: 13.
Glow Plugs: 6 units (12 V or 24 V), pre-heat time 4-6 seconds at -10°C.
ECU Sensors: Crank position, cam position, rail pressure, intake
manifold pressure, coolant temperature, oil pressure, fuel temperature.
Emissions Controls: Internal EGR mapping (no external EGR valve on this
Tier 3 variant) plus high-pressure injection.
Dry Weight (without flywheel, starter, alternator): 591 kg (1303 lb).
Length (fan to flywheel housing): 1168 mm (46.0 in).
Width (overall, exhaust manifold to intake manifold): 698 mm (27.5 in).
Height (oil pan rail to rocker cover): 978 mm (38.5 in).
Oil Pan Depth (standard): 230 mm (9.1 in).
Crankshaft Centerline Height: 348 mm (13.7 in) from pan rail.
Valve Lash Inspection Interval: 1000 hours (first check at 500 hours).
Fuel Filter Replacement (primary): 500 hours.
Fuel Filter Replacement (secondary): 1000 hours.
Coolant Change Interval: 3000 hours or 3 years.
Belt Replacement Interval (poly-vee): 1500 hours or when cracking
appears.
Air Filter (radial seal type): Replace when restriction indicator shows
635 mm H2O.
Injector Replacement Interval: 6000 hours (recommended).
HPCR Pump Overhaul: 8000 hours.
Cylinder Liner Protrusion Check: During any cylinder head removal.
ECU Diagnostic Connector: 9-pin Deutsch (J1939 protocol).
Cylinder Head Bolts (M12 x 1.75), Step 1: 100 Nm (75 lb-ft).
Cylinder Head Bolts (M12 x 1.75), Step 2: 150 Nm (110 lb-ft).
Connecting Rod Bolts: Step 1: 58 Nm (43 lb-ft).
Main Bearing Cap Bolts: 135 Nm (100 lb-ft).
Flywheel to Crankshaft Bolts: 128 Nm (95 lb-ft).
Flywheel Housing to Block: 80 Nm (59 lb-ft).
Rocker Arm Shaft Bracket: 40 Nm (30 lb-ft).
Intake Manifold: 30 Nm (22 lb-ft).
Exhaust Manifold: 45 Nm (33 lb-ft).
Injector Hold-Down Clamp: 28 Nm (21 lb-ft).
High-Pressure Fuel Line Nuts: 35 Nm (26 lb-ft).
Glow Plug: 20 Nm (15 lb-ft).
Oil Pan Drain Plug: 45 Nm (33 lb-ft).
Thermostat Housing Bolts: 25 Nm (18 lb-ft).
Valve Cover Bolts: 12 Nm (9 lb-ft).
Poly-vee Belt Tensioner Bolt: 48 Nm (35 lb-ft).
Crankshaft Pulley Bolt: 450 Nm (332 lb-ft).
Construction: John Deere 744J, 824J, 844J wheel loaders.
Construction: Deere 672J, 772J motor graders; 330C, 410G backhoe
loaders; 550J, 650J, 700J crawler dozers.
Agricultural: John Deere 7030 series (7530, 7630, 7730) row-crop
tractors.
Agricultural: Deere 8530, 8630 large-frame tractors; 9670 STS, 9770 STS
combines.
Generator Drive: John Deere 250-300 kVA prime power sets (Powersys, FG
Wilson, Multiquip).
Industrial: Hydraulic power units, wood chippers, concrete pump trucks,
and irrigation pump stations.
Material Handling: Sullair air compressors (185-375 cfm range) and Genie
telescopic boom lifts (S-125, S-120 models).
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