heui.pdf
TRANSCRIPT
Service TrainingMALAGA
Large Track Type Tractors
AdolfoMay 1997
1 ENGINE CONTROL 3400 HEUI
1. Components Layout2. Operation3. Testing & Adjusting
CH
AP
TE
R : 3400 H
EU
I
HE
UI F
UE
L SY
ST
EM
Large Track Type Tractors
1-2P
age:
High PressureOil Pump
HIGH PRESSURE OIL MANIFOLD
Fuel Return Line
ECM
FuelFilter
FuelTransPump
Fuel Tank
OilPump
OilSump
OilCooler
OilFilter
VehicleSystem
Engine System
RegulatorPressureControlValve
40 to 210 BAR
LOW PRESSURE 3 BAR
CHAPTER : 3400 HEUI
HEUI FUEL SYSTEM
Large Track Type Tractors
1-3Page:
The electronic components in the HEUI fuel system are very similar to those used in other EUI systems.However, in the HEUI system, the injectors are not actuated by a camshaft
The seven major types of components in the HEUI fuel system are:
• Hydraulic Supply Pump Group containing:
- High pressure hydraulic pump
- Pump control valve
- Transfer pump
• ECM
• Throttle Control
• Speed/Timing Sensor
• Injector
• Temperature Sensor
• Pressure Sensor
CHAPTER : 3400 HEUI
INJECTOR COMPONENTS
Large Track Type Tractors
1-4Page:
BARREL
PISTON
VALVE
FUEL INLETCHECK VALVE
PIN
SPACER
SLEEVE
VALVE BODY
CHECK
SHIM
ADAPTER
SPACER
ARMATURE
SOLENOID
WASHER
PLUNGER
SLEEVE
LOWER FUEL SEAL
UPPER FUEL SEAL
NOZZLE
CHAPTER : 3400 HEUI
INJECTION CYCLE
Large Track Type Tractors
1-5Page:
CHAPTER : 3400 HEUI
POPPET VALVE OPEN
Large Track Type Tractors
1-6Page:
ARMATURESCREW
POPPETSPRING
CHAPTER : 3400 HEUI
DRAIN CYCLE
Large Track Type Tractors
1-7Page:
CHAPTER : 3400 HEUI
POPPET VALVE CLOSED
Large Track Type Tractors
1-8Page:
INLETVALVE SEAT
SOLENOID
POPPET VALVE
ARMATURE
EXHAUSTVALVE SEAT
CHAPTER : 3400 HEUI
NOZZLE GROUP
Large Track Type Tractors
1-9Page:
FUEL ATOMIZATION
NOZZLE GROUP
CHECK VALVE
REVERSE FLOWCHECK VALVE
CHAPTER : 3400 HEUI
PRIME RATE SHAPING
Large Track Type Tractors
1-10Page:
CROSS SECTIONOF PLUNGER
START OF INJECTION PRESSURE DROP
INJECTIONRATE
START OFINJECTION DURATION
FINALPRESSURE INCREASE
TIME (MILLISECONDS)
END OFINJECTION
CHAPTER : 3400 HEUI
VENTING INTERNAL LEAKS
Large Track Type Tractors
1-11Page:
During the normal injection cycle, the pressure of the oil supplied to the top of the intensifierpiston can increase to 22800 kPa (3300 psi). A seal is installed to minimize leakage past thepiston.
Some oil which is necessary for lubrication of the intensifier piston may pass the seal and settlemomentarily below the piston.
Also, a small amount of fuel may leak past the plunger and barrel. This fuel will settlemomentarily in the cavity below the intensifier piston.
If the fluids which accumulate below the piston are not vented, a hydraulic lock could occur. Asthe piston moves down, the fuel is ejected past the barrel ball check valve to the low pressureinlet. The check valve then closes during the plunger and piston upstroke.
INTENSIFIERPISTON SEAL
BARREL
INTENSIFIERPISTON
VENTINGCHECK VALVE
CHAPTER : 3400 HEUI
INJECTOR CHECK VALVES
Large Track Type Tractors
1-12Page:
BARREL GROUP NOZZLE GROUPFUEL INLETCHECK VALVE
NOZZLECHECK VALVE
FUELATOMIZATION
VENTINGCHECK VALVE
REVERSE FLOWCHECK VALVE
The Fuel Inlet Check Valveallows fuel to fill the barrel below the plunger, but closes as the plungermoves down and pressure increases.
The Venting Check Valvevents fluids from below the intensifier piston.
The Reverse Flow Check Valveprevents combustion gasses from flowing back through the injectorfrom the nozzle.
The Nozzle Check Valvecontrols valve opening pressure by preventing the flow of fuel through thenozzle holes until sufficient pressure is available to lift the valve from its seat
CHAPTER : 3400 HEUI
PRESSURE CONTROL
Large Track Type Tractors
1-13Page:
IDLE
INJE
CT
ION
PR
ES
SU
RE
MECHANICALLY ACTUATEDFUEL SYSTEM
H E U I
ENGINE SPEED
CH
AP
TE
R : 3400 H
EU
I
LOW
PR
ES
SU
RE
OIL (H
YD
R.) S
UP
PLY
Large Track Type Tractors
1-14P
age:
TO LUBESYSTEM
FUELTRANSFER
PUMP
PUMPCONTROL
VALVE
OILFILTER
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSOR
OIL PRESSURESENSOR
ECM
COOL DOWNCIRCUIT
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTERPRIMARY
FUEL FILTERWATER
SEPARATOR
LUBE OILPUMP
COLD STARTOIL
RESERVOIR
HYDRAULICSUPPLYPUMP
GROUP
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
CHAPTER : 3400 HEUI
HIGH PRESSURE HYDRAULICS
Large Track Type Tractors
1-15Page:
TO
LU
BE
SY
ST
EM
FU
EL
TR
AN
SF
ER
PU
MP
PU
MP
CO
NT
RO
LV
ALV
E
OIL
FIL
TE
R OIL
CO
OLE
R
HE
UI
HE
UI
OIL
SU
MP
HY
DR
AU
LIC
PR
ES
SU
RE
SE
NS
OR
HY
DR
AU
LIC
TE
MP
ER
AT
UR
ES
EN
SO
R
OIL
PR
ES
SU
RE
SE
NS
OR
HY
DR
AU
LIC
SU
PP
LYP
UM
PG
RO
UP
CO
OL
DO
WN
CIR
CU
ITF
UE
LT
EM
PE
RA
TU
RE
SE
NS
OR
EC
M
FU
EL
TA
NK
PR
ES
SU
RE
RE
GU
LAT
ING
VA
LVE
SE
CO
ND
AR
YF
UE
LF
ILT
ER
PR
IMA
RY
FU
EL
FIL
TE
RW
AT
ER
SE
PA
RA
TO
R
LUB
E O
ILP
UM
P
CO
LD S
TA
RT
OIL
RE
SE
RV
OIR
FLU
ID M
AN
IFO
LDH
YD
RA
ULI
C P
AS
SA
GE
FLU
ID M
AN
IFO
LDH
YD
RA
ULI
C P
AS
SA
GE
CHAPTER : 3400 HEUI
REVERSE FLOW CHECK VALVE
Large Track Type Tractors
1-16Page:
CH
EC
KF
ITT
ING
SP
RIN
GV
ALV
E B
LOC
KS
EA
TFR
OM
PU
MP
TO
INJE
CT
OR
S
SE
AT
(EN
D V
IEW
)
CHAPTER : 3400 HEUI
REVERSE FLOW CHECK VALVE
Large Track Type Tractors
1-17Page:
The hydraulic supply pump group has two outlet ports, each connected by steel tubes to a hydraulicsupply manifold. An integral reverse flow check valve is located in each outlet port.
This view shows that pressure surges travelling back from the injectors toward the pump will cause thecheck valve to close and block any interference between the banks. In normal operation, the valve willoscillate at high frequency as it blocks the pressure surges.
The valve check fits loosely on the shaft to allow oil flow from the reservoir during the cooling process.
If the check valves were not in the system, pressure surges between the banks would cause erraticoperation of the injectors by adversely affecting timing. The pressure surge causes the poppet valves toopen prematurely. This condition would start
fuel injection earlier than normal, thereby advancing the timing.
CHAPTER : 3400 HEUI
LOW PRESSURE FUEL SUPPLY
Large Track Type Tractors
1-18Page:
TO L
UBE
SYST
EM
FUEL
TRAN
SFER
PUM
PPR
ESSU
RE
REG
ULA
TIN
GVA
LVE
PUM
PC
ON
TRO
LVA
LVE
OIL
FILT
ER OIL
CO
OLE
R
LUBE
OIL P
UM
P
HEU
I
HEU
I
OIL
SUM
P
HYD
RAU
LIC
PRES
SUR
ESE
NSO
R
HYD
RAU
LIC
TEM
PER
ATU
RE
SEN
SOR
OIL
PR
ESSU
RE
SEN
SOR
ECM
CO
OL
DO
WN
CIR
CU
ITFU
ELTE
MPE
RAT
UR
ESE
NSO
R
FUEL
TAN
K
SEC
ON
DAR
YFU
EL F
ILTE
R(2
MIC
RO
N)
PRIM
ARY
FUEL
FIL
TER
WAT
ERSE
PAR
ATO
R
CO
LD S
TAR
TO
ILR
ESER
VOIR
HYD
RAU
LIC
SUPP
LYPU
MP
GR
OU
P
FLU
ID M
ANIF
OLD
HYD
RAU
LIC
PAS
SAG
E
FLU
ID M
ANIF
OLD
HYD
RAU
LIC
PAS
SAG
E
CHAPTER : 3400 HEUI
LOW PRESSURE FUEL SUPPLY
Large Track Type Tractors
1-19Page:
On a HEUI equipped engine, the lubrication pump has two functions:
1. Provides lubrication to the engine
2. Provides low pressure charge oil to the HEUI hydraulic pump
The engine lubrication pump has been enlarged to provide the required increase in flow.
During normal operation conditions, oil is pressurized between 5000 and 21500 kPa (725 and 3100 psi)by the high pressure hydraulic pump to actuate the injectors.
The pressure regulating valve regulates fuel pressure between 310 and 415 kPa (45 and 60 psi).
The ratio of fuel between combustion and fuel return to the tank is about 1:3 (i.e. four times the volumerequired for combustion is supplied to the system for combustion and injector cooling purposes).
CH
AP
TE
R : 3400 H
EU
I
Large Track Type Tractors
1-20P
age:
INJE
CTO
R F
LUID
FLO
W
LOW PRESSUREFUEL SUPPLY
CYLINDER HEADINJECTOR SLEEVE
FLUID SUPPLYMANIFOLD
INJECTOR
INJECTOR OILADAPTER
JUMPER TUBE
INJECTOR CLAMP
HIGH PRESSUREHYDRAULIC PASSAGE
CYLINDER HEAD
ROCKER ARM BASE
LUBE OIL PASSAGE
CYLINDER BLOCKCOOLANT
METAL WASHER
HIGH PRESSUREHYDRAULIC OIL
CH
AP
TE
R : 3400 H
EU
I
INJE
CTO
R F
UE
L SU
PP
LY
Large Track Type Tractors
1-21P
age:
FLUID SUPPLYMANIFOLD
INJECTOR
CYLINDERHEAD
LOWER INJECTORO-RING SEAL
UPPER INJECTORO-RING SEAL
METAL-TO- METALCONTACT
LOW PRESSUREFUEL SUPPLY
CYLINDER HEADINJECTOR SLEEVE
UPPER SLEEVEO-RING SEAL
LOWER SLEEVEO-RING SEAL
CH
AP
TE
R : 3400 H
EU
I
HE
UI P
UM
P
Large Track Type Tractors
1-22P
age:
PRIMING PORT
ORIFICE
RESERVOIR
SWASHPLATE
TRANSFER PUMP
COMPENSATORVALVE
VALVE BASE
DRAIN PASSAGE
CH
AP
TE
R : 3400 H
EU
I
STA
RT-U
P
Large Track Type Tractors
1-23P
age:
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLDCOLD START
RESERVIOR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(ENERGIZED)
DISPLACEMENTCONTROL PISTON
CHECK VALVE
SUPPLY PUMP
CH
AP
TE
R : 3400 H
EU
I
STA
RT-U
P
Large Track Type Tractors
1-24P
age:
PRESSURE LIMITER SPOOL
CHECK VALVE
PUMP CONTROLVALVE
DRAIN ORIFICE
ORIFICE
TOCASEDRAIN
LOAD SENSING SPOOL
FROM DISPLACEMENTCONTROL PISTON
REVERSE FLOWCHECK VALVES
TO CASE DRAIN
CHAPTER : 3400 HEUI
START-UP
Large Track Type Tractors
1-25Page:
The displacement of the pump is controlled to maintain the desired operating pressure at the flow raterequired by the injectors. The displacement is regulated by an electro-hydraulic control.
Displacement of the pump is varied by pivoting the swashplate from 0 degrees to a maximum angle of 15.5 degrees. When the engine is not running, the swashplate is at themaximum angle. During operation, the displacement control piston adjusts the swashplate position tomeet the system flow demand.
During initial cranking, the swashplate is at full displacement until the supply pressure increases to 6200kPa (900 psi). The spring at the end of the load sensing spool regulates this pressure. Then, thespecification programmed into the ECM for normal cranking will override this pressure. Until this point,the control valve solenoid is fully energized for the pressure increase.
During START-UP, pressure from the pump enters the compensator assembly. The Pump Control Valveis energized for quick pressure build-up.
Pressure is felt at both ends of the Load Sensing Spool. The spool is shifted to the right and oil from theDisplacement Control Piston is vented to case drain. The swashplate is at maximum angle.
The drain orifice below the Pump Control Valve provides a small amount of restriction to improve valvestability
CH
AP
TE
R : 3400 H
EU
I
DE
ST
RO
KE
Large Track Type Tractors
1-26P
age:
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLDCOLD START
RESERVIOR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(DE-ENERGIZED)
CHECK VALVE
DISPLACEMENTCONTROL PISTON
SUPPLY PUMP
CH
AP
TE
R : 3400 H
EU
I
DE
ST
RO
KE
Large Track Type Tractors
1-27P
age:
PUMPCONTROL VALVE
DRAIN ORIFICE
TO DISPLACEMENT CONTROL PISTON
TO CASE DRAIN
PRESSURELIMITER SPOOL
CHECK VALVE
ORIFICE
LOAD SENSINGSPOOL
CHAPTER : 3400 HEUI
DESTROKE
Large Track Type Tractors
1-28Page:
After the engine starts and pressure increases, the ECM will signal the control valve to match the actualwith the desired pressure by momentarily de-energizing and then regulating the current flow to the pumpcontrol valve solenoid.
The decrease in current applied to the pump control valve solenoid lowers the pressure required toinitiate flow through the pump control valve. This lower cracking pressure on the pump control valvecreates a force imbalance on the load sensing spool, causing the spool to move toward the spring end ofthe compensator. This spool motion connects the displacement control piston to pump output flow,allowing the swashplate to decrease the displacement of the pump. The decreased displacement lowersthe pump output to the pressure level required by the ECM.
During DESTROKE, the ECM momentarily de-energizes the Pump Control Valve causing a pressuredrop in the spring chamber of the Load Sensing Spool.
Unbalanced pressures force the spool to the left, allowing the oil to enter the Displacement ControlPiston and move the swashplate toward minimum angle.
CH
AP
TE
R : 3400 H
EU
I
UP
ST
RO
KE
Large Track Type Tractors
1-29P
age:
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLDCOLD START
RESERVIOR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(ENERGIZED)
CHECK VALVE
DISPLACEMENTCONTROL PISTON
SUPPLY PUMP
CH
AP
TE
R : 3400 H
EU
I
UP
ST
RO
KE
Large Track Type Tractors
1-30P
age:
PRESSURELIMITER SPOOL
CHECK VALVE
ORIFICE
LOAD SENSINGSPOOL
PUMPCONTROL VALVE
DRAIN ORIFICE
FROMDISPLACEMENT
CONTROL PISTON
TO CASE DRAIN
CHAPTER : 3400 HEUI
UPSTROKE
Large Track Type Tractors
1-31Page:
As the load on the engine increases and higher pressure is required, the ECM will signal the controlvalve to increase pressure by increasing the current flow to the pump control valve solenoid.
The increase in current applied to the pump control valve solenoid raises the pressure setting of thepump control valve. This higher pressure at the pump control valve creates a force imbalance on theload sensing spool, causing the spool to move toward the supply signal line end of the compensator.This spool motion vents the displacement control piston to case drain, allowing the spring to move theswashplate to increase the displacement of the pump. The increased displacement raises the pumpoutput to the desired pressure level required by the ECM.
As the load is applied to the engine, the ECM increases current to the Pump Control Valve.
Pressure is felt at both ends of the Load Sensing Spool. The spool moves to the right (due to springforce) and oil from the Displacement Control Piston is vented to case drain, which allows the swashplateto momentarily go to maximum angle and build pressure quickly.
CH
AP
TE
R : 3400 H
EU
I
PR
ES
SU
RE
LIMIT
ER
OP
ER
ATIO
N
Large Track Type Tractors
1-32P
age:
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLDCOLD START
RESERVIOR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(DE-ENERGIZED)
DISPLACEMENTCONTROL PISTON
SUPPLY PUMP
PLUGGEDORIFICE
CH
AP
TE
R : 3400 H
EU
I
PR
ES
SU
RE
LIMIT
ER
OP
ER
ATIO
N
Large Track Type Tractors
1-33P
age:
PRESSURE LIMITERSPOOL
CHECK VALVE
ORIFICE
LOAD SENSINGSPOOL
PUMPCONTROL VALVE
DRAIN ORIFICE
TODISPLACEMENT
CONTROL PISTON
TO CASE DRAIN
RESTRICTION
CHAPTER : 3400 HEUI
PRESSURE LIMITER OPERATION
Large Track Type Tractors
1-34Page:
If the load sensing spool or pump control valve sticks or otherwise malfunctions to create higher thandesired operating pressures, the maximum pressure limiter spool is utilized. In this schematic, a pluggedorifice is simulated. (This example represents an actual condition which was caused by debris beingintroduced during a field replacement of the compensator valve.)
The Pressure Limiter Spool directs pump outlet flow to the displacement control piston and reduces thestroke of the pump if the system pressure exceeds 25600 kPa (3700 psi).
During these conditions, the pump will develop 24800 to 25600 kPa (3600 to 3700 psi) maximumpressure, regardless of the desired hydraulic pressure. The Check Engine Lamp will be ON, indicating afault.
A Pump Control Valve Test will verify the control valve operation. This test enables the technician tomanually ramp the pressure up and down using the ET service tool. This procedure will also be usefulwhen evaluating the condition of the hydraulic system.
If the supply pressure exceeds 25600 kPa (3700 psi), the force acts on the Pressure Limiter Spool andshifts it to the left. This movement compresses the spring and allows oil to unseat the check valve andpressurize the displacement control piston. The swashplate moves to minimum angle to decrease flowand limit system pressure.
CH
AP
TE
R : 3400 H
EU
I
PU
MP
CO
NT
RO
L VALV
E
Large Track Type Tractors
1-35P
age:
ADAPTER CAGE
RINGSHELLPIN
STATOR
SEAL SEATPOPPETVALVE
SOLENOIDARMATURE
STOP
TOCASE DRAIN
FROM LOADSENSING SPOOL
VALVE
NO CURRENT FLOW
COILASSEMBLY
EDGEFILTER
SPRINGRETAINER
VALVEBLOCK
CH
AP
TE
R : 3400 H
EU
I
PU
MP
CO
NT
RO
L VALV
E
Large Track Type Tractors
1-36P
age:
ADAPTER CAGE
RINGSHELLPIN
STATOR
SEAL SEATPOPPETVALVE
SOLENOIDARMATURE
STOP
COILASSEMBLY
EDGEFILTER
SPRINGRETAINER
FROM LOADSENSING SPOOL
VALVE
VALVEBLOCK
HIGH CURRENT FLOW
TOCASE DRAIN
CH
AP
TE
R : 3400 H
EU
I
CO
MP
ON
EN
TS
DIA
GR
AM
Large Track Type Tractors
1-37P
age:
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY KEY
SWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMPCONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
INSTRUMENTPANEL
AUTO RETARDER CONTROL
EPTC II TRANSMISSION CONTROL
ELECTRONIC SERVICE TOOL
CAT DATA LINK
FANFAN SPEED SENSOR
FAN CONTROL VALVE
TURBO INLET PRESSURE SENSOR
THROTTLE BACK-UP, ELEVATED LOW IDLE ENABLE,AND GROUND LEVEL SHUTDOWN (2) SWITCHES
THROTTLESENSOR ACCELERATOR
PEDAL
DISCONNECT SWITCH
MACHINEHARNESS
CHAPTER : 3400 HEUI
SENSORS - ANALOG & DIGITAL
Large Track Type Tractors
1-38Page:
ANALOG SENSORS
- HYDRAULIC PRESSURE
- COOLANT TEMPERATURE
- ATMOSPHERIC PRESSURE
- TURBOCHARGER INLET PRESSURE
- TURBOCHARGER OUTLET PRESSURE
- LUB. OIL PRESSURE
- HYDRAULIC TEMPERATURE
- FUEL TEMPERATURE
DIGITAL SENSORS
- THROTTLE POSITION
- PUMP CONTROL VALVE SIGNAL
- EXHAUST TEMPERATURE (not installed on machine engines at this time)
CHAPTER : 3400 HEUI
SYSTEM POWER SUPPLIES
Large Track Type Tractors
1-39Page:
The HEUI system has six power supplies with various voltages as shown.
EXTERNAL POWER SUPPLY
ECM power supply 24 Volts
INTERNAL POWER SUPPLIES
Speed/Timing Sensor power supply 12.5 Volts
Injector power supply 105 Volts
Analog Sensor power supply 5 Volts
Digital Sensor power supply 8 Volts
Pump Control Valve power supply 0 to 24 Volts
The power supply to the ECM and the system is drawn from the 24-Volt machine battery. The principlecomponents in this circuit are:
- Battery- Key Start Switch- Main Power Relay- 15 Amp Breaker- Ground Bolt- ECM Connector (P1/JI)- Machine Interface Connector (J3/P3)
If the supply voltage exceeds 32.5 Volts or is less than 9.0 Volts, a diagnostic code is logged. (See theTroubleshooting Guide for complete details on voltage event logging.)
NOTE: The ground bolt is the only power supply component mounted on the engine.
CHAPTER : 3400 HEUI
LOGGED EVENTS
Large Track Type Tractors
1-40Page:
Logged events are abnormal to the operation of the engine (for example: high temperature, low pressureor excessive engine speed). These conditions would not normally be caused by an electronic problem.
Some of the parameters listed in this presentation are used in the ET events list. They are:
- High coolant temperature above 107°C (225°F)
- Loss of coolant flow
- Low (lubrication) oil pressure (according to the oil pressure map)
- Abnormal injection actuation hydraulic pressure (low or high)
- Injection actuation pressure system fault
- User defined shutdown (if installed)
- Air inlet restriction (if installed)
- Engine overspeed histogram
- Low fuel pressure (industrial engine only)
Events are not logged if an electronic fault is detected.
Passwords are required to clear events. This process would normally be performed during an engineoverhaul. At other times, the events would be left as a record of the engine history prior to overhaul time.
CHAPTER : 3400 HEUI
SYSTEM LIMITS & DERATE
Large Track Type Tractors
1-41Page:
FUEL SYSTEM DERATES
AUTOMATIC ALTITUDE COMPENSATION( Altitude derate)
AUTOMATIC FILTER COMPENSATION( Derate for air filter restriction if installed )
ENGINE WARNING DERATE ( Derates for LOW OIL PRESSURE, HIGH COOLANT TEMP not install in HEUI at the time)
MAXIMUM HORSEPOWER
TORQUE LIMIT ( Determines torque rise characteristics)
FUEL RATIO CONTROL ( Limits fuel until sufficient boost )
COLD MODE ( Limits fuel to control white smoke )
CRANKING FUEL ( Limits fuel during cranking )
FUEL SYSTEM LIMITS
FUEL SYSTEM DERATES
AUTOMATIC ALTITUDE COMPENSATION( Altitude derate)
AUTOMATIC FILTER COMPENSATION ( Derate for air filter restriction if insatalled At 6.25 kPa (30 inc of water) the engine will derate 2% of its power per 1 kPa until a maxi 20% Event is logged if exeeds 30 inch of water )
ENGINE WARNING DERATE ( Derates for LOW OIL PRESSURE , HIGH COOLANT TEMP not installed yet on HEUI)
CH
AP
TE
R : 3400 H
EU
I
TIM
ING
WH
EE
L
Large Track Type Tractors
1-42P
age:
4
3
6
5
7
2
1
8
REF
REF
REF
REF
REF
REF
REF
REF
TDCTDC
TDC
TDCTDC
TDC
TDC
SINGLE50/50 TOOTH
TIMING WHEELROTATION
TDC CYLINDER No. 1
TIMINGCALIBRATIONRANGE ± 10°
PRIMARYSPEED/TIMING
SENSOR
SECONDARYSPEED/TIMING
SENSOR
CH
AP
TE
R : 3400 H
EU
I
CR
AN
KIN
G
Large Track Type Tractors
1-43P
age:
A B C D E F G H
TIMING WHEEL ROTATION
80/20 % 80/20 % 80/20 %80/20 % 50/50%80/20 % 80/20 %
TIMING GEAR TOOTH TABLE
TABLEENTRY
CYLINDERREFERENCE
ABCDEFGH
80 %80 %80 %80 %80 %80 %80 %50 %
NONE IDENTIFIED
PWM DUTYCYCLE
CH
AP
TE
R : 3400 H
EU
I
AF
TE
R PAT
TE
RN
RE
CO
GN
ITIO
N
Large Track Type Tractors
1-44P
age:
TIMING WHEEL ROTATION
CYL NO. 3REFERENCE
EDGE
CYL NO. 4TDC
CYL NO. 4REFERENCE
EDGE
CYL NO. 8REFERENCE
EDGE
CYL NO. 3TDC
TIMING GEAR TOOTH TABLE
CYLINDERREFERENCE
80 %80 %80 %80 %80 %80 %80 %50 %
NOCYL NO. 3NONOCYL NO. 4NONOCYL NO. 8
TABLEENTRY
ABCDEFGH
PWM DUTYCYCLE
A B C D E F G H
CH
AP
TE
R : 3400 H
EU
I
NO
RM
AL O
PE
RAT
ION
Large Track Type Tractors
1-45P
age:
TIMING GEAR TOOTH TABLE
PWM DUTYCYCLE
CYLINDERREFERENCE
80 %80 %80 %80 %80 %80 %80 %50 %
NOCYL NO. 3NONOCYL NO. 4NONOCYL NO. 8
CYL NO. 4(REFERENCE)
CYL NO. 4ACTUAL TDC
(CALIBRATED)
62° BTDC (EEPROM)
DES TIMING
NO. 4INJECTION
TABLEENTRY
TIMING WHEEL ROTATION
ABCDEFGH
A B C D E F G H
CYL NO. 3(REFERENCE)
CYL NO. 3ACTUAL TDC
(CALIBRATED)
62° BTDC (EEPROM)
DES TIMING
DELAY NO. 3INJECTION
DELAY
ASSUMEDTDC
ASSUMEDTDC
CH
AP
TE
R : 3400 H
EU
I
TIM
ING
CA
LIBR
ATIO
N
Large Track Type Tractors
1-46P
age:
REFERENCE EDGE TO TDC DISTANCE
REFERENCEEDGE ASSUMED
CYL. NO. 1 TDCACTUAL
CYL. NO. 1 TDC
TIMINGREFERENCE
OFFSET
MAXIMUM TIMING REFERENCE OFFSET ± 10 DEGREES
TIMING CALIBRATIONSENSOR SIGNAL
TIMINGWHEEL
+10°± 10°
-10°
CH
AP
TE
R : 3400 H
EU
I
INJE
CT
ION
CU
RR
EN
T W
AVE
FO
RM
Large Track Type Tractors
1-47P
age:
0 1 2 3 4
CU
RR
EN
T F
LOW
TIME (MILLISECONDS)
PULL-IN PEAK CURRENT
HOLD-IN PEAK CURRENT
ONE CYCLE
5
CH
AP
TE
R : 3400 H
EU
I
PO
PP
ET
VALV
E M
OV
EM
EN
T
Large Track Type Tractors
1-48P
age:
0 1 2 3 4
CU
RR
EN
T F
LOW
TIME (MILLISECONDS)
CURRENT
POPPETLIFT
5
CH
AP
TE
R : 3400 H
EU
I
WAV
EF
OR
M&
RE
SP. C
HA
RA
CT
ER
IST
ICS
Large Track Type Tractors
1-49P
age:
0 1 2 3 4
CU
RR
EN
T F
LOW
TIME (MILLISECONDS)
CURRENT
POPPETLIFT
INJECTIONRATE
START OFINJECTION
DURATION
5END OF
INJECTION