Engine - Engine and crankcase

Engine - Static description

General information

The diesel engines the 620 series described this manual are water - cooled four stroke straight - type engines with common rail injection All the models are equipped with replaceable cylinder liners and exhaust turbochargers and charge air cooling (air / The engines are controlled the EEM3 control The exhaust regulations according Level are complied

Cylinder block

The rib - braced cylinder block the main unit the which the other engine components are

The wet and replaceable cylinder liners are supported the reducing vibrations and feeding most the coolant flow the upper part the cylinder liners. The seal between the lower part the cylinder liner and the cylinder block made three O - which are inserted the grooves the cylinder liner The upper part sealed the cylinder head

The camshaft the cylinder block. All camshaft bearings are equipped with replaceable Guide bearings are integrated both sides the rear main bearing the crankshaft (crankshaft axial

Flywheel housing

The flywheel housing positioned the rear end the cylinder block. The gasket for the rear end the crankshaft inserted a hole the The point starter attachment the flywheel The underside the flywheel housing serves the sealing surface for the oil pan This means that the lower surface the cylinder block must make a flush seal with the flywheel When installing the flywheel its position determined roll

Cylinder head

The engines have two cylinder heads which can Each cylinder has its own intake and exhaust channel the cylinder There inlet valve between the outlet valves compensate the thermal load.

The cylinder head bolts are high - strength pre - tensioned bolts that are tightened their yield limit following the principle angular Given the high level the tightening forces are kept constant over the entire usage period which means that tightening not

The injection nozzle seats are machined directly the cylinder The inlet and outlet valve guides are identical and can addition the inlet and outlet valves are equipped with replaceable valve seat

V alve mechanism

The valve mechanism actuated the camshaft the cylinder The actuation force transferred valve tappets and tappet

The press - fit camshaft gear sits the camshaft and radially fixed with a feather key The bearings are lubricated through holes the engine block with pressurised

Exhaust gas return system (EGR)

Due a tightening legal regulations concerning exhaust emissions (tier has become necessary employ a range measures fulfill these One these measures internal exhaust gas recirculation system A special camshaft allows internal exchange gases without the need for additional additional inlet cam (c) the camshaft opens the inlet valve 2 during the exhaust Using this method a part the exhaust gas channelled into the intake channel and recirculated back the cylinder during the intake Because the cam (c) opens the inlet valve every operating depends the boost pressure the one hand and the exhaust gas pressure the other how much exhaust gas returned and whether any exhaust gas returned

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(A) Angular degrees for the crankshaft (B) Opening stroke for the valves

(a) Outlet cam

(c) EGR cam

Crank drive

(b) Inlet cam

The crankshaft forged chrome alloyed steel and inductively hardened the bearing and sealing

The bearings can ground four times without the need for rehardening. The press - fit gears sit the front end the They drive the the high pressure pump and the oil addition the front end the crankshaft has keyways take the drive The pulley and rotational vibration absorber isco) are fitted the The front PT O shaft also driven this hub (if oil - repellent ring fitted between the hub and gear One the crank webs carries the transmitter wheel for the speed sensor

There a main bearing for the crankshaft both sides each cylinder . therefore has seven bearings. The axial bearings are both sides the rearmost main the rear end the crankshaft there a which a press - fit sprocket

The forged connecting rods have I - shaped cross - The connecting rod bearing divided horizontally “breaking”. The bearing cover fastened with two special The upper part has a tapered bearing seat into which the press - fit piston pin bearing bush fitted.

The material from which the pistons are made eutectic aluminium alloy There a combustion cavity the piston optimum mix air and fuel achieved thanks the shape the optimised combustion cavity The pistons have two sealing rings and oil scraper The upper piston coated with has a trapezoidshaped cross -

The middle piston ring a tapered compression piston ring (the outer diameter has a conical surface). The oil scraper ring suspended and has two chromed stripper

The pistons are ring carrier pistons (for the receptacle for the upper piston a ring carrier made special cast iron poured into the piston). The piston shaft also coated with graphite the sliding surface ensure a perfect run The piston top cooled from below additional splash oil soon the oil pressure exceeds 3 bar

Damper (vibration absorber)

Housing

Space for silicone oil Absorber bulk

Bearing bush

The damper stops the crankshaft from torsional vibrations and thus ensures that the engine runs smoothly The housing screwed the front end the crankshaft together with the forms a ring - shaped cavity with a right - angled cross - Inside there a ring - shaped absorber bulk which mounted radially a bearing bush with little clearance. The free space filled with semifluid silicone oil with a stable temperature. The housing tightly The damper maintenance -

NOTE: The housing must not deformed during disassembly and assembly Dents into the ing could jam the absorber bulk (which otherwise moves freely) and thereby restrict the Damage which leads the absorber unit becoming leaky make the absorber ineffective the silicone oil Absorbers with dents their housing must not

NOTE: markings need made the absorber housing aid performing certain adjustment work the engine, only marker pens electric engraver may used for this purpose. Never make dents for markings.

T imer gears

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Camshaft gear

T win idler gear

Idler gear Drive wheel - crankshaft

Drive wheel - high pressure fuel pump

The meshings the engine control unit gears are hardened and

The gears are located the timer gear housing which fitted the front the engine.

The high pressure fuel pump driven the twin idler gear (4) The idler gear (2) runs pressure - lubricated plain does the The journal fastened the front cylinder block surface. The twin idler gear mounted with two taper roller bearings.

The timer gears drive the the high pressure fuel pump and the oil

Lubrication system

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Lube oil pump Oil pressure valve Oil filter T urbocharger

Main oil duct Oil injection nozzle Sensor

The engine equipped with a pressure lubrication system whose oil pump (gear pump) attached the underside the cylinder The oil sucked the pump through a screener From the the oil fed through oil line the oil cooler (heat exchanger) and oil filter The oil pressure valve positioned parallel Then the oil fed into the main oil duct from which other oil holes branch The oil fed through holes the main bearings and through the crankshaft the connecting rod

The pressurised oil fed from the main oil duct the turbocharger and the pressurised air compressor (if the bearings the idler gear , the camshaft bearings and the valve mechanism are lubricated with pressurised oil via the main oil

The piston tops are sprayed with and cooled oil from below long the lube oil pressure greater than 3 bar . The oil pressure valve regulates the lube oil pressure such that held a certain range regardless the engine Depending oil viscosity and the oil pressure between 2.5 - 5 bar engine idling the oil pressure must least 1 bar

The oil filter a one - way main flow filter overflow valve located the underside the filter ensures the engine lubricated after a cold start extremely low outside temperatures and ensures appropriate lubrication the event the filter being A check valve prevents the filter being completely emptied oil after the engine switched

Cooling system

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Coolant pump Thermostats

Diversion duct Radiator Expansion tank Oil cooler Sensor , engine temperature

The coolant pump driven the belt fitted the front end the cylinder block. The thermostat housing located above the The cooling system equipped with two thermostats which regulate the flow The thermostats have dif ferent opening the coolant temperature below the opening temperature, the coolant (A) flows back the coolant pump via the diversion The smaller single - action thermostat (1) starts open and allows some the coolant (B) flow into the radiator the temperature the engine the dual - circuit thermostat (2) also starts open. When closes the diversion and directs the entire flow coolant (C) into the radiator

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Fan

V isco fan with modulating hub (standard equipment) : With the modulating each incoming air temperature corresponds one particular long there only little cooling requirement the fan turns low speed high slip) but dependent the engine The airflow through the cooling set (air conditioning condenser - charge air cooler - transmission oil cooler - engine coolant cooler) acts upon the front the V isco this point there a - metallic spring which constantly measures the outgoing air temperature after the coolant cooler As the outgoing air temperature rises (increasing tractor load), the control valve reduces the slip and the fan rotates faster depending the temperature until the minimum slip 5 % the outgoing air temperature falls (decreasing tractor the control valve increases the slip and the fan rotates more slowly depending the temperature. The advantages the V isco fan with modulating hub are: more precise adjustment cooling output tractor further reduction power requirements and lower noise The V isco fan maintenance -

Reverse fan (option):

The blades the reverse fan are fitted the hub such that they are able

The built - thermo - elements allow the angle the blades varied during operation and the degree cooling the fan adjusted the level Return springs hold the blades a secure The following automatic sequence activated tipping the button:

The electronic central control unit (ECCU3) controls a small air compressor , driven electric motor , and a solenoid This control unit mounted the left the V a pressure line and a special pressurised air reaches the centering actuators which rotate with the hub and the turning the a a powerful flow air blows the opposite direction through the cooler and any material drawn in, such grass, insects removed the After seconds the blades automatically return the home the driver undertakes the relevant programming the activation the fan reverse function can also take place automatically , e.g. connection with automated processes involving the rear front powerlift the AUX auxiliary control

Intake and exhaust system

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Compared aspirated engines which are turbocharged react more sensitively badly maintained air filters and leaks the intake and exhaust

Therefore the prescribed maintenance and inspection work carried out conscientiously and the maintenance intervals observed.

Condition the air filter and the intake system:

The s performance and the life the engine are also largely dependent the condition the air filter and the intake

T dirty air filter a bent intake hose will reduce the performance and result engine oil being drawn through the shaft mounting gasket the turbocharger

NOTE: A leaky air filter (damaged air damaged missing seal) leaks the intake system between the air filter and the turbocharger allow larger impurities enter the turbocharger and subsequently the cylinders the engine.

The filter system for the intake air consists advance cyclone filter (integrated the air filter) and a dry air filter with safety cartridge. The intake air rotated the advance cyclone filter . Heavy particles dirt are thereby deposited towards the outside and are separated the advance cyclone filter ’ s dust removal

Ejector:

The tractor can equipped with for use extremely dusty injector , whose hose connection sucks continuously when the engine fitted the exhaust The dust particles rating the pre - filter are continuously sucked via a hose connection and discharged into the atmosphere together with the exhaust

Design the filter cartridges:

The dirt particles the air are collected the main cartridge which can cleaned necessary The inner safety cartridge prevents dirt particles penetrating into the engine the event a fault incorrectly installed main For maintenance the filter cartridge please see the operating

Display for filter service:

There a pressure dif ference switch the filter This switch illuminates a monitoring lamp and a symbol the ADIC when the air filter has reached a particular level contamination. The intake system also includes the air pipes between the air filter and the turbocharger , and between the turbocharger and the charge air cooler , well between the charge air cooler and the intake

The exhaust manifold fixed the cylinder head with special screws without a separate gasket. Retightening the special screws not necessary

The turbocharger lubricated and cooled with oil from the engine lubrication

Charge air cooling:

The intake air compressed the turbocharger can reach a temperature 150 for high degrees capacity cooled - a charge air cooler which located front the engine radiator (air / air Cooling the charge air lowers the thermal and mechanical load the engine and reduces the discharge nitrogen oxides and sooty particles.

Boost pressure and charged air temperature parameters for engine control:

A combined sensor located the air collector . continually supplies the electronic engine management (EEM3) with information about the boost pressure and charged air conjunction with the common rail injection fuel injection optimised and the discharge nitrogen oxides and sooty particles significantly

The charge air cooler designed service - friendly . can folded and can thus fectively cleaned against the direction the outside air blowing against The folding charge air cooler also allows easy access the other

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