6 hydraulic cylinder unit 2012

8/13/2019 6 Hydraulic Cylinder Unit 2012

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Hydraulic Cylinder Unit (HCU)p

01/01/2012 MAN Diesel & TurboHydraulic Cylinder Unit < 1 >


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High pressure pipes

Hydraulic Cylinder Unit

End cover

ELFI Valve

Fuel oil pressure boosterAccumulator

C linder Lubrication

Pressure Decay Time and other t rouble

shooting issues

01/01/2012 MAN Diesel & TurboME-B Hydraulic Cylinder Unit


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HCUHCUH drau li c C l inder Un itH d rau li c C l inder Un it

HPSHPSHydraulic Power SupplyHydraulic Power Supply

BOLL filterBOLL filter



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Dual cylinderHPS


High Pressure Pipes


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Fuel Oil Pressure boosterFuel Oil Pressure booster

ME LubricatorME Lubricator

AccumulatorAccumulator

ELFI valveELFI valve

01/01/2012 MAN Diesel & TurboME-B Hydraulic Cylinder Unit 3333572.2006.04.12 (2200/OZS)

Distribution blockDistribution block


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Distribution Blockp



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Distribution Blockp



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Distribution Blockp



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End cover fore sidep



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End cover fore sidep



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End cover aft sidep



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-p



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Suction valveSuction valve Slide Fuel

High pressure pipeHigh pressure pipe

Fuel pumpFuel pump

va ve

Fuel pumpFuel pump

Fuel oil inlet

8 bar

Fuel oil inlet

8 bar

p ungerp unger

Hydraulic

piston

Hydraulic

piston

Membrane

accumulator

Membrane

accumulatorELFI

Proportional

valve

ELFI

Proportional

valve


drain

drain High pressure hydraulic oil inletHigh pressure hydraulic oil inlet


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Fuel Oil Pressure Boosterp



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y


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y


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Fuel Oil Pressure Booster and ELFI valvep


y


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Engine:

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ly


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Engine:

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gly

E i


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Engine:

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The ELFI is immediately set to Drain Position (safe position) if:

The ELFI valve feedback signal is not valid, i.e. outside 3.5 - 20.5 mA

The ELFI valve feedback signal indicates a too high (not physical possible)

speed

The ELFI valve feedback signal indicates a position not allowed outside a

window around TDC

Pressing the Re-enable button on the Engine->Chief Limiters Screen

Fuel Injection is re-enabled by either:

Invalidation and then re-validation of the input ch. 30(cyl. A) or ch. 33 (cyl. B)

on the relevant CCU


Resetting the CCU

g nly


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TDC

Injection start

angle trig

In ection control

Injection

ELFI valve window

supervision


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Engine:

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Accumulator


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The accumulator charge pressure should be

checked within the first week of service.

Next check should be made around 4 months

later, followed by checking every 6 months.

A minor leakage from the accumulators isunavoidable, and service experience shows

that a pressure drop in the range of 2-5

bar/month is to be expected.

The charge pressure is dependent on the

accumulatortemperature. E.g.:


136 bar @ 20C, 154 bar @ 50C


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Cylinder Lubricatorp



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The ME Engine


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Inductive proximity sensor

ivin feedback si nal forC linder lub. oil

control of piston movement Lubricator

activation signal

from controller

inlet

ow sensor

Injection plunger

Spacer for

basic setting of

Stroke

adjusting

screw

Drain

oil

outlet

200 to 300 bar system oil supply

stroke

ActuatorNon-return valve


Sealing ring

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Channel J51 on a working CCU

In case of CCU failure, where theCCU cannot be replaced

immediately, backup cylinder

follows:

Connect temporary cables from

two other CCU units, plug 51, to

the solenoid valves on the

The lubrication will be with random

timing.


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H d li P D


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Hydraulic Pressure Decayp



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Hydraulic System complete


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6 hydraulic cylinder unit 2012

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