John Deere 6068HL280 Specifications
| Engine Model: John Deere PowerTech E 6068HL280 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 130-137 Hp (97-102 kW) at 2300 rpm |
| Fuel System Type: Common Rail Direct Injection |
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The John Deere 6068HL280 is a 6.8-liter, inline
6-cylinder diesel engine from the PowerTech E series. It represents a
transition from mechanical to electronic fuel management, incorporating
a high-pressure common rail (HPCR) injection system with an electronic
engine control unit (ECU). This engine is turbocharged and equipped with
an air-to-air aftercooler to reduce intake air temperatures and improve
combustion efficiency.
The "HL" designation indicates a high-power, lugging curve configuration
suitable for variable-speed industrial and agricultural applications.
Certified to EPA Tier 3 and EU Stage III A emissions standards, the
6068HL280 uses replaceable wet cylinder liners, a forged steel
crankshaft, and a 12-valve overhead valve layout. Rotation is
counter-clockwise when viewed from the flywheel end.
Engine Type: Inline, 4-cycle, turbocharged diesel with air-to-air
aftercooling
Family: John Deere PowerTech E series
Number of Cylinders: 6
Valves per Cylinder: 2 (12 valves total)
Displacement: 415 cu-in (6.8 L)
Bore x Stroke: 4.19 in x 5.00 in (106 mm x 127 mm)
Compression Ratio: 19.0:1
Firing Order: 1-5-3-6-2-4
Aspiration: Turbocharged, fixed geometry with air-to-air aftercooler
Rotation (facing flywheel): Counter-clockwise
Rated Power (EC 97/98, gross): 130 hp (97 kW) at 2300 rpm
Rated Power (ECE R24, net): 126 hp (94 kW) at 2300 rpm
Maximum Power (EC 97/68, gross): 137 hp (102 kW) at 2300 rpm
Peak Torque (6030 series): 389 lb-ft (527.5 Nm) at 1600 rpm
Peak Torque (7030 series): 358 lb-ft (485.4 Nm) at 1500 rpm
Torque Rise: 28-32%
Rated Speed: 2300 rpm
Low Idle Speed: 850 rpm
High Idle Speed (no load): 2460 rpm
Operating Speed Range: 1600-2300 rpm
Emissions Standard: EPA Tier 3 / EU Stage III A
The cylinder block is fabricated from high-strength cast iron with a
deep-skirt design for maximum rigidity under high cylinder pressures. It
incorporates seven main bearing supports to maintain crankshaft
alignment throughout the operating range. A defining feature is the use
of replaceable wet cylinder liners. These liners are in direct contact
with engine coolant through ports machined into the block, providing
efficient heat transfer from the combustion zone to the cooling system.
The wet liner design permits in-frame overhaul without removing the
engine from the vehicle or machinery. The block includes integrated oil
galleries feeding the crankshaft, camshaft, and piston cooling jets. A
rear-mounted gear train drives the camshaft, high-pressure injection
pump, and auxiliary equipment.
The cylinder head is manufactured from cast iron with a cross-flow
design optimized for turbocharged operation. Intake ports are on the
right side, and exhaust ports are on the left side when viewed from the
flywheel end. Each cylinder receives two valves: one intake and one
exhaust, totaling twelve valves for the entire engine. The overhead
valve (OHV) configuration uses pushrods and rocker arms actuated by a
camshaft located within the cylinder block.
Valve rotators are installed on all exhaust valves and on selected
intake valves to prevent carbon buildup and promote even seat wear under
sustained high-load operation. The valve seat inserts are
induction-hardened and replaceable. Valve clearance adjustment is
performed by loosening a locknut and turning an adjusting screw on the
rocker arm. The cylinder head gasket is a multi-layer steel (MLS) design
capable of withstanding the increased cylinder pressures generated by
the HPCR fuel system.
The engine employs a high-pressure common rail (HPCR) injection system
controlled by an electronic engine control unit (ECU). This system
replaces the mechanical Stanadyne rotary pump found on earlier 6068
engines. A gear-type fuel transfer pump draws fuel from the tank through
a primary filter (water separator) before supplying the HPCR pump. The
pump pressurizes fuel to accumulation pressures significantly higher
than mechanical systems, delivering it to a common rail mounted on the
cylinder head.
Each cylinder has a dedicated electronic injector actuated by the ECU
based on engine speed, load, temperature, and other sensor inputs. The
ECU maintains precise injection timing and fuel quantity for emissions
compliance and optimal combustion. A manual primer lever is provided for
system priming after filter or injector service. Excess fuel returns to
the tank through a leak-off line.
Oil Capacity (with filter): 20.6-20.8 qt (19.5-19.7 L)
Oil Pressure at rated speed: 40-60 psi (2.8-4.1 bar)
Recommended Oil Grade: SAE 15W-40 (API CI-4, CJ-4, or CK-4)
Oil Filter: Full-flow spin-on type with integral bypass valve
Service Interval (engine oil change): 500 hours
System Features: A gear-type oil pump mounted on the front of the
crankshaft draws oil through a strainer inside the oil pan. Piston
cooling jets are installed in the crankcase, directing a continuous oil
spray to the underside of each piston crown. This system manages piston
temperature under full turbocharged load. An oil cooler, integrated into
the coolant circuit, maintains oil temperature within operational
limits.
Coolant Capacity (engine only): 11.9 L (12.6 qt)
Coolant Capacity (with radiator, 6030/7030 tractors): 28.0 L (29.6 qt)
Thermostat opening temperature: 180°F (82°C)
Thermostat fully open temperature: 203°F (95°C)
Coolant Change Interval: 3000 hours
Coolant Type: Ethylene glycol-based with supplemental coolant additives
(SCA)
Water Pump: Belt-driven centrifugal type with a cast iron housing
Cooling Fan: Viscous fan drive (variable speed)
System Features: A bypass thermostat circuit maintains rapid warm-up and
prevents thermal shock. The cooling system includes a separate circuit
for the oil cooler. A coolant recovery tank is standard on industrial
applications.
| Intake and Exhaust Systems |
Air Intake System: Dry element air cleaner with dual paper filter
elements. An air-to-air aftercooler (ATAAC) reduces intake air
temperature after turbocharging, increasing charge density and
combustion efficiency.
Exhaust System: Cast iron exhaust manifold with a single inlet to the
turbocharger. The turbocharger is a fixed-geometry, journal-bearing unit
receiving oil from the main gallery.
Electrical System: 12 volt with 800 CCA battery capacity.
Starter Motor: 12V, pre-engaged type with solenoid, rated at 4.0 hp (3.0
kW).
Alternator: 12V, output varies by application.
Engine Control Unit (ECU): Electronic control unit managing fuel
injection timing, quantity, and pressure based on multiple sensor inputs
including engine speed, coolant temperature, intake air temperature,
boost pressure, and throttle position.
Dry Weight: 608 kg (1340 lb)
Length (flywheel to front pulley): 1123 mm (44.2 in)
Width (maximum): 657 mm (25.9 in)
Height (from oil pan rail to rocker cover): 1036 mm (40.8 in)
Engine Oil Change Interval: 500 hours under normal industrial duty.
Engine Oil Change Interval (severe service): 250 hours.
Oil Filter Change: Every oil change.
Fuel Filter Change (secondary): 500 hours.
Fuel Filter Change (primary/water separator): 250 hours or when
water-in-fuel sensor indicates.
Valve Clearance (intake - cold engine): 0.014 in (0.356 mm).
Valve Clearance (exhaust - cold engine): 0.018 in (0.457 mm).
Valve Clearance Inspection Interval: 1000 hours.
Air Cleaner Service Interval: When restriction indicator shows red or at
500 hours maximum.
Coolant Change Interval: 3000 hours or 36 months.
Wet Liner Protrusion above block deck: 0.001-0.005 in (0.03-0.13 mm).
Low Idle Speed Adjustment: 850 rpm.
High Idle Speed (no load): 2460 rpm.
Rated Speed Adjustment (full load): 2300 rpm.
Cylinder Head Bolts (Step 1): 75 lb-ft (102 Nm)
Cylinder Head Bolts (Step 2): 110 lb-ft (150 Nm)
Connecting Rod Bolts: 43 lb-ft (58 Nm)
Main Bearing Cap Bolts: 100 lb-ft (135 Nm)
Flywheel Bolts: 95 lb-ft (129 Nm)
Flywheel Housing Bolts: 45 lb-ft (61 Nm)
Crankshaft Pulley/Vibration Damper Bolt: 200 lb-ft (270 Nm)
Rocker Arm Shaft Bracket Bolts: 18 lb-ft (24 Nm)
Valve Rocker Adjusting Locknut: 15 lb-ft (20 Nm)
Injection Pump Drive Gear Nut: 90 lb-ft (122 Nm)
Common Rail Mounting Bolts: 18 lb-ft (24 Nm)
Injector Clamp Bolts: 18 lb-ft (24 Nm)
Oil Pan Bolts: 18 lb-ft (24 Nm)
Water Pump Mounting Bolts: 18 lb-ft (24 Nm)
Starter Motor Mounting Bolts: 35 lb-ft (47 Nm)
Alternator Mounting Bracket Bolts: 45 lb-ft (61 Nm)
Front Timing Gear Cover Bolts: 18 lb-ft (24 Nm)
Turbocharger Mounting Nuts: 35 lb-ft (47 Nm)
Oil Cooler to Block Bolts: 35 lb-ft (47 Nm)
The John Deere 6068HL280 engine is installed in a range of agricultural
tractors, construction equipment, and industrial machinery produced from
approximately 2006 to 2011.
Agricultural Tractors (6030 Series): John Deere 6630 (130 hp), 6530,
6430.
Agricultural Tractors (7030 Small-Frame Series): John Deere 7130 (121
hp), 7230.
Combines: Select John Deere 60 and 70 series combines as a primary power
unit.
Construction Backhoe Loaders: John Deere 310K, 410K series.
Wheel Loaders: John Deere 544K series.
Motor Graders: John Deere 672G series.
Industrial Power Units: Stationary units for irrigation pumps, hydraulic
power packs, air compressors, and generator sets.
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