John Deere 6068HFC48 Specifications
| Engine Model: John Deere PowerTech Plus 6068HFC48 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 180-282 Hp (134-210 kW) at 2400 rpm |
| Fuel System Type: Common Rail Direct Injection |
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The John Deere 6068HFC48 is a 6.8-liter, inline
6-cylinder diesel engine from the PowerTech Plus series. This model is
certified to EPA Tier 3 and EU Stage IIIA emissions standards and is
primarily utilized as an original equipment manufacturer (OEM) power
unit for specialized industrial applications, notably for Clarke Fire
pumps and various forestry machines. The “HFC” designation indicates a
High-pressure Common-Rail (HPCR) fuel system with advanced electronic
controls and an optimized air handling system.
The 6068HFC48 represents the high-output configuration within the 6.8L
PowerTech Plus family, distinguished by its use of a High-Pressure
Common-Rail (HPCR) fuel system and a Variable Geometry Turbocharger
(VGT). This combination delivers superior transient response and precise
fuel management compared to mechanical predecessors. The engine is
engineered for demanding intermittent and heavy-duty industrial cycles,
offering a substantial torque rise for load acceptance.
Known for its robust construction using wet-sleeve cylinder liners, the
HFC48 variant prioritizes reliability in stationary and mobile
off-highway equipment. Maintenance is structured around a 500-hour
service interval for oil and filters. Service documentation confirms the
availability of detailed technical manuals (Component Technical Manual
CTM146 and CTM113) for this engine series, which provide comprehensive
repair instructions and diagnostic procedures.
Engine Family: John Deere PowerTech Plus.
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.
Aspiration: Turbocharged and air-to-air aftercooled (ATAAC).
Turbocharged Type: Variable Geometry Turbocharger (VGT).
Rated Power (Industrial High-Output): Up to 210 kW (282 hp) at 2400 rpm.
Rated Power (Industrial Range): 134-205 kW (180-275 hp).
Power (Generator - 60 Hz): Configurable for 1800 rpm operation.
Peak Torque: 1025 Nm (756 lb-ft) at 1400 rpm.
Torque Rise: 26-32% depending on the power curve calibration.
Low Idle Speed: 900 rpm.
High Idle Speed (No Load): 2540 rpm.
Emission Standard: EPA Tier 3, EU Stage IIIA.
Material: High-strength cast iron with deep-skirt design.
Cylinder Liners: Replaceable wet-sleeve design.
Number of Cylinders: 6.
Bore Diameter: 106 mm (4.17 in).
Main Bearings: 7 main bearing caps (one between each cylinder).
Crankcase Ventilation: Closed breather system with oil separator.
Block Features: The design incorporates a rigid crankcase to minimize
vibration at variable speeds. The engine serial number is located on the
left side of the cylinder block.
Material: Cast iron.
Valvetrain: Overhead valve (OHV) with pushrods and forged rocker arms.
Valves per Cylinder: 4 (2 intake, 2 exhaust).
Total Valves: 24.
Valve Arrangement: Cross-flow design (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).
Cylinder Head Gasket: Multi-layer steel (MLS) construction.
The Component Technical Manual (CTM146) provides specific procedures for
disassembly and inspection of the 4-valve cylinder head assembly.
System Type: High-Pressure Common-Rail (HPCR) electronically controlled.
Injection Pressure (Maximum): 1600 bar (23,200 psi).
Control Unit: Electronic Engine Control Unit (ECU) with proprietary JD
software.
High-Pressure Pump: Bosch CP3 (radial piston pump).
Injectors: Electronically actuated solenoid injectors.
Fuel Filter: Two-stage filtration system with integral water separator.
Fuel Type: No. 1-D or No. 2-D Diesel.
System Features: The HPCR system eliminates mechanical timing
adjustments. All timing and injection duration are controlled by the ECU
based on sensor input (crank position, cam position, rail pressure,
boost pressure).
System Type: Gear-type positive displacement pump with full-flow
filtration.
Oil Capacity (including filter): 19.0 L (20.0 qt).
Oil Pressure (Hot, Rated Speed): 310-450 kPa (45-65 psi).
Oil Specification: API CI-4, CJ-4, or CK-4; SAE 15W-40 preferred.
Oil Change Interval (Industrial): 500 hours.
Oil Filter: Full-flow spin-on element.
Oil Pan: Stamped steel or cast aluminum depending on application
configuration.
System Type: Water-cooled with high-flow centrifugal pump.
Coolant Capacity (Engine only): 11.9 L (12.6 qt).
Thermostat (Opening Temperature): 82°C (180°F).
Thermostat (Full Open): 94°C (202°F).
Coolant Specification: Ethylene glycol base, 50/50 mix with distilled
water, low silicate.
Water Pump Drive: Poly-vee belt with automatic tensioner.
Aftercooler Type: Air-to-air (ATAAC) - separate from the engine coolant
loop.
Turbocharger: Variable Geometry Turbocharger (VGT) - Schwitzer S200
series (BorgWarner).
Electrical System (Standard): 12 Volt.
Electrical System (Optional): 24 Volt.
Starter Motor: 24 Volt (OSGR - Offset Gear Reduction, 7.5 kW, 11 teeth).
Alternator: 12V or 24V depending on machine configuration.
Flywheel Housing: SAE (Society of Automotive Engineers) configuration,
varies by application (generator drive or industrial).
Governing: Electronic speed control with droop settings configurable for
generator or variable speed machinery.
Dry Weight: 678 kg (1495 lb).
Length: 1161 mm (45.7 in).
Width: 616 mm (24.3 in).
Height: 1128 mm (44.4 in).
Oil Change Interval: 500 hours or 12 months.
Fuel Filter Change Interval: 500 hours.
Coolant Change Interval: 3000 hours or 3 years.
Valve Lash Inspection Interval: 1000 hours (first check at 500 hours
after overhaul).
Air Filter Service: Replace when restriction indicator shows 635 mm H2O
(25 in H2O).
Injection Interval (Service): 6000 hours (injector replacement
recommended).
Belt Inspection: Every 500 hours; automatic tensioner requires no
adjustment.
Cylinder Liner Protrusion (Block Deck): 0.06-0.12 mm (0.0024-0.0047 in).
Cylinder Head Bolts (M12 x 1.75), Stage 1: 100 Nm (75 lb-ft).
Cylinder Head Bolts (M12 x 1.75), Stage 2: 150 Nm (110 lb-ft).
Connecting Rod Bolts: 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 Connections: 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).
Fire Pumps: Clarke OEM Engine packages (primary designated use for the
“C48” specification).
Forestry Equipment: Forwarders (1110E, 1110G, 1210E, 1210G) and Wheeled
Harvesters (1170E).
Forestry Swing Machines: 2954D Forestry Swing Machine.
Wheel Loaders: 444H, 444J, 444K, 524K, 544H, 544J, 624H, 624J, 624K,
644H, 644J, 644K, 724J, 744K.
Excavators: 230LC, 270LC, 330C, 330LC, 608B, 753G, 759G, 853G, 903G,
953G.
Articulated Trucks: 250D, 300D.
Self-Propelled Sprayers: 4730, 4830, M4030, M4040.
Combines/Harvesters: 770D, 9560 STS, 9570 STS, 1070D, 1270D, S440, S540,
S550, T550, W540, W550, W650.
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