7.PPPC vs LSPC
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Transcript of 7.PPPC vs LSPC
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Proportional, Priority, Pressure
Compensated Hydraulic Systems
Objectives:
• Provide students with a comparison of a basic PPPC
hydraulic system to a basic LS/PC hydraulic system
• Explain PPPC hydraulics as it is used on representative Cat
products
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ORIFICE
PRESSURE
REDUCING
VALVE
FLOW CONTROL VALVE
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ENGINE
FIXED
DISPLACEMENTPUMP
CLOSED CENTER
CONTROL VALVE
3000 PSISPRING
DOUBLE
CHECK VALVE
PRESSURE
REDUCING VALVE
50 PSI
SPRING
LOAD
PRESSURE COMPENSATION
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Definition:
Pressure CompensationA control system which results in constant
implement speed for a given lever displacement.The system does this by maintaining a
controlled pressure drop across the main
control or directional spool in each circuit.
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3000 PSI
SPRING
300 PSI
SPRING
A
B
LOAD
LOAD
ENGINE
FLOWCONTROLVALVE
RESOLVER
RESOLVER
RESOLVER
RELIEFVALVE
LOAD SENSING WITH SIGNAL NETWORK
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BOOM
PRIMARYRESOLVER
SECONDARY
RESOLVER
TO IMPLEMENT
CONTROL VALVES
SIGNAL NETWORK
SWING BUCKET STICKRIGHT
STABILIZER
LEFT
STABILIZER
3000 PSISPRING
300 PSI
SPRING
ENGINE
FLOWCONTROLVALVE
RELIEFVALVE
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Definition:
Load Sensing
A control system that maintains a pump supplypressure at a fixed value above the highest
system pressure requirement.
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VARIABLE DISPLACEMENT PUMPPUMP OUTPUT
LARGE ACTUATOR
SMALL ACTUATOR
& BIAS SPRING
SWASH PLATE
DRIVESHAFT
YOKE PAD
PRESSURE
COMPENSATOR
(PRESSURE CUT-OFF)
FLOW COMPENSATOR
( MARGIN SPOOL)
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ENGINE FIXED
DISPLACEMENT
PUMP
CLOSED CENTER
CONTROL VALVE
3000 PSISPRING
DOUBLE
CHECK VALVE
50 PSI
SPRING
300 PSI
SPRING
LOAD
LOAD SENSING / PRESSURE COMPENSATION
FLOWCONTROL
VALVE
PRESSURE
REDUCING VALVE
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ENGINE
VARIABLEDISPLACEMENT
PUMP
CLOSED CENTERCONTROL VALVE
DOUBLECHECK VALVE
PRESSUREREDUCING VALVE
50 PSISPRING
PUMPCONTROL
VALVE LOAD
LOAD SENSING / PRESSURE COMPENSATION
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MOTOR
3000 PSISPRING
300 PSI
SPRING
A
B
LOAD
LOAD
LOAD SENSING
TWO VALVE OPERATION
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LS Only - Pressure DifferentialsFlow Needs Met
Maximum Pump Flow = 30 gpm
Valve A desired flow = 10 gpm
Valve B desired flow = 10 gpmMargin Pressure is normal
System Pressure = Valve A load plus margin pressure = 2300 psi
∆P Directional Spool
Valve A @ 2000 psi 2300 - 2000 = 300 psi
Valve B @ 1000 psi 2300 - 1000 = 1300 psi
Pressure ∆P Varies
If Valve A load stayed the same and Valve B would vary as the load on the circuit
varied, the operator would have to constantly shift the lever to maintain implement
control.
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ENGINE
3000 PSI
SPRING
50 PSISPRING
300 PSI
SPRING
50 PSI
SPRING
LOAD
LOAD
A
B
LOAD SENSING / PRESSURE COMPENSATION
TWO VALVE OPERATION
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LS/PC - Pressure DifferentialsFlow Needs Met
Maximum Pump Flow = 30 gpmValve A desired flow = 10 gpm
Valve B desired flow = 10 gpm
Margin Pressure is normal
System Pressure = Valve A load plus margin pressure = 2300 psi
∆P Compensator ∆P Directional Spool
Valve A @ 2000 psi 2300 - (2000+50) = 250 psi 2050 - 2000 psi = 50 psi
Valve B @ 1000 psi 2300 - (1000+50) = 1250 psi 1050 psi - 1000 psi = 50 psi
∆P Varies ∆P the Same
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LS/PC - When Flow Demand Exceeds
Available Pump Flow
Maximum Pump Flow = 30 gpm
Margin Pressure less than normal
Desired Flow Available FlowValve A @ 2000 psi 30 gpm 0 gpm
Valve B @ 1000 psi 20 gpm 20 gpm
Valve C @ 500 psi 10 gpm 10 gpm
Total 60 gpm 30 gpm
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PPPC HYDRAULIC SYSTEMTWO VALVE OPERATION / FLOW NEEDS MET
PUMP
SIGNAL
LIMITER
VALVE
2000PSI
1000PSI
50 PSISPRING
50 PSISPRING
VALVE A VALVE B
300 PSIMARGINSPRING
3500 PSICUTOFFSPRING
PRESSURECOMPENSATINGCHECK VALVE
PILOT OIL PILOT OIL
BRIDGEPASSAGE
FEEDERPASSAGE
DIRECTIONALSPOOL
30 GPM
MAXIMUM
FLOW
10 GPMFLOWREQ'D
10 GPMFLOWREQ'D
3000 PSISPRING
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PPPC - Pressure DifferentialsFlow Needs Met
Maximum Pump Flow = 30 gpmValve A desired flow = 10 gpm
Valve B desired flow = 10 gpm
Margin Pressure is normal
System Pressure = Valve A load plus margin pressure = 2300 psi
∆P Directional Spool ∆P Compensator
Valve A @ 2000 psi 2300 - (2000+50) = 250 psi 2050 - 2000 psi = 50 psi
Valve B @ 1000 psi 2300 - (2000+50) = 250 psi 2050 psi - 1000 psi = 1050 psi
∆P the Same ∆P Varies
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PUMP
SIGNAL
LIMITER
VALVE
2000PSI
1000PSI
50 PSISPRING
50 PSISPRING
VALVE A VALVE B
300 PSIMARGINSPRING
3000 PSISPRING
PRESSURECOMPENSATINGCHECK VALVE
PILOT OIL PILOT OIL
BRIDGEPASSAGE
FEEDERPASSAGE
DIRECTIONALSPOOL
30 GPM
MAXIMUM
FLOW
20 GPMFLOWREQ'D
20 GPMFLOWREQ'D
PPPC HYDRAULIC SYSTEMTWO VALVE OPERATION / HIGH FLOW DEMAND
3500 PSICUTOFFSPRING
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PPPC - Pressure DifferentialsFlow Needs Not Met
Maximum Pump Flow = 30 gpmValve A desired flow = 20 gpm Proportioned Flow = 15 gpm
Valve B desired flow = 20 gpm Proportioned Flow = 15 gpm
Margin pressure less than normal
System Pressure = Valve A load plus reduced margin pressure = 2200 psi
∆P Directional Spool ∆P Compensator
Valve A @ 2000 psi 2200 - (2000+50) = 150 psi 2050 - 2000 psi = 50 psi
Valve B @ 1000 psi 2200 - (2000+50) = 150 psi 2050 psi - 1000 psi = 1050 psi
∆P the Same ∆P Varies
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PPPC - When Flow Demand Exceeds
Available Pump Flow
Maximum Pump Flow = 30 gpm
Margin pressure less than normal
Desired Flow Available FlowValve A @ 2000 psi 30 gpm 15 gpm
Valve B @ 1000 psi 20 gpm 10 gpm
Valve C @ 500 psi 10 gpm 5 gpm
Total 60 gpm 30 gpm
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Definition:Proportional, Priority, Pressure
Compensated Hydraulic System
Provides precise multiple circuit flow control
whenever pump flow is exceeded. This is
accomplished through post main spool pressure
compensation, which results in proportional
flow division.
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PPPC HYDRAULIC SYSTEMTWO VALVE OPERATION / CUTOFF CONTROLS MAX. PRESSURE
PUMP
SIGNAL
LIMITER
VALVE
3500PSI
1000PSI
50 PSISPRING
50 PSISPRING
VALVE A VALVE B
300 PSIMARGINSPRING
3500 PSICUTOFFSPRING
PRESSURECOMPENSATINGCHECK VALVE
PILOT OIL PILOT OIL
BRIDGEPASSAGE
FEEDERPASSAGE
DIRECTIONALSPOOL
30 GPM
MAXIMUM
FLOW
10 GPMFLOWREQ'D
4000 PSISPRING
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PPPC - Pressure DifferentialsPressure Cutoff Controls Maximum System Pressure
Maximum Pump Flow = 30 gpmValve A desired flow = Stalled
Valve B desired flow = 10 gpm Actual Flow = 0 gpm
Margin pressure = 0
System Pressure = Controlled by Pressure Cutoff = 3500 psi
∆P Directional Spool ∆P Compensator
Valve A @ 3500 psi 3500 - 3500 = 0 psi 3500 - 3550 psi = -50 psi
Valve B @ 1000 psi 3500 - 3500 = 0 psi 1000 - 3550 psi = -2550 psi
∆P the Same Neg ∆P Varies = No Flow
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Telehandlers
PPPC Hydraulic System
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HYDRAULIC
PUMP
SIGNAL
LINE
TANK
FILTER
HMU
FRAME
LEVEL
CONTROLVALVE FRAME
LEVEL
JOYSTICK
FORKS
ATTACHMENT
CARRIER
ROTATE TILT
COMPENSATING
VALVE
COMPENSATING
CYLINDERS
DIRECTIONAL
CONTROL
VALVES
BOOM
EXTEND/RETRACT
BOOM
RAISE/LOWER
DIFFERENTIAL LOCKSELECTOR
VALVE MANIFOLD
IMPLEMENT AND STEERING SYSTEM
TO BRAKE
BOOST CYLINDER
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DIFFERENTIALLOCK
TO OTHER
VALVES
SIGNAL
RELIEF
VALVE SIGNAL FROM
OTHER VALVES
RETURN FROM
OTHER VALVES
BOOM
RETRACT
BOOM
EXTEND
BOOM
LOWER
BOOM
RAISE
HYDRAULIC SYSTEM
PUMP
TILT
BACKTILT
FORWARD
PRESSURE
REDUCING
VALVE
MANUAL
OVERRIDE
JOYSTICK
PILOT
CONTROL
VALVESERVICE BRAKE
BOOST CYLINDER
SELECTOR
VALVE
MANIFOLD
STEERING
VALVE
BOOM
RAISE/LOWER
CONTROL VALVE
BOOM
RETRACT/EXTEND
CONTROL VALVE
TILT
CONTROL
VALVE
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COMPENSATOR VALVESTEERING AND IMPLEMENT PUMPCONSTANT FLOW
SIGNAL
PRESSURE
TO CONTROL
VALVE GROUP
PRESSURE
CUTOFF SPOOL
MARGIN
SPOOL
BIAS
SPRING
ACTUATOR
PISTON
SWASHPLATE
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JOYSTICK
PILOT
CONTROL
VALVE
DIFFERENTIALLOCK
TO OTHER
VALVES
SIGNAL
RELIEF
VALVESIGNAL FROM
OTHER VALVES
RETURN FROM
OTHER VALVES
BOOM
RETRACTBOOM
EXTEND
BOOM
LOWER
BOOM
RAISE
HYDRAULIC SYSTEM IMPLEMENTS IN HOLD
SELECTOR
VALVEMANIFOLD
TO
HMU
TILT
BACKTILT
FORWARD
PRESSURE
REDUCING
VALVE
STEERING
PRIORITY
VALVE
PRESSURE
COMPENSATINGCHECK VALVE
RESOLVER
SERVICE BRAKE
BOOST CYLINDER
PUMP
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PORT A PORT B
FROM PILOT
SYSTEM
PRESSURE
COMPENSATINGCHECK VALVE
RESOLVERVALVE
RETURN
TO TANK
BRIDGE
PASSAGE
FEEDER
PASSAGE
A B
SIGNAL
PASSAGE
FEEDER
PASSAGE
PUMP
SUPPLY
IMPLEMENT
CONTROL VALVEHOLD
DIRECTIONAL
CONTROLSPOOL
RESOLVED
SIGNALTO NEXT
VALVE
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B
PORT A PORT B
FROM PILOT
SYSTEM
PRESSURE
COMPENSATINGCHECK VALVE
RESOLVERVALVE
RETURN
TO TANK
BRIDGE
PASSAGE
FEEDER
PASSAGE
A
SIGNAL
PASSAGE
FEEDER
PASSAGE
PUMP
SUPPLY
RESOLVED
SIGNAL
IMPLEMENT
CONTROL VALVESHIFT
DIRECTIONAL
CONTROL
SPOOL
TO NEXT
VALVE
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B
A B
A B
A B
PILOT OIL
SIGNAL TO
PUMP CONTROL
STEERINGVALVE
BOOM
RAISE/LOWER
VALVE
BOOM
EXTEND/RETRACTVALVE
TILT
VALVE
AUX.
VALVE
SIGNAL
RELIEF VALVEPRESSURE
REDUCING
VALVE
TELEHANDLER IMPLEMENT VALVE GROUP
LINE
RELIEF
VALVE
A
PUMP SUPPLY
RESOLVER
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JOYSTICK
PILOT
CONTROL
VALVE
DIFFERENTIALLOCK
TO OTHER
VALVES
SIGNAL
RELIEF
VALVESIGNAL FROM
OTHER VALVES
RETURN FROM
OTHER VALVES
BOOM
RETRACT
BOOM
EXTEND
BOOM
LOWER
BOOM
RAISE
HYDRAULIC SYSTEM BOOM RAISE
SELECTOR
VALVEMANIFOLD
TO
HMU
TILT
BACKTILT
FORWARD
PRESSURE
REDUCING
VALVE
STEERING
PRIORITY
VALVE
PRESSURE
COMPENSATINGCHECK VALVE
RESOLVER
SERVICE BRAKE
BOOST CYLINDER
PUMP
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'H' Series Motor Graders
PPPC Hydraulic System
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RIGHT
VALVE BANK
LEFT
VALVE
BANK
PUMP
COMPENSATOR
VALVEACCUMULATOR
COMBINATION
VALVE
HAND
METERING
UNIT
TANK
STEERING AND IMPLEMENT HYDRAULIC SYSTEM
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TO IMPLEMENTCYLINDERS
TO IMPLEMENTCYLINDERS
TO STEERINGCYLINDERS
LEFTVALVEBANK
RIGHT
VALVEBANK
STEERINGACCUMULATOR
HANDMETERING
UNIT
COMBINATIONVALVE
PUMP
COMPENSATORVALVE
FILTER
IMPLEMENTSIGNAL LINE
H-SERIES
HYDRAULIC SYSTEM
STEERINGSIGNAL LINE
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PUMP OUTPUTSIGNAL
REDUCED PRESSURE
PUMP AND COMPENSATOR OPERATIONCONSTANT FLOW
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FROM STEERINGHAND METERING UNIT
TO PUMPCOMPENSATOR VALVE
RIGHTBLADE LIFT
LEFTBLADE LIFT
WHEELLEAN
CENTERSHIFT
ARTICULATION
SIDESHIFT
CIRCLEDRIVE
BLADE TIP
TO
COMPENSATORVALVES
SIGNAL RESOLVER VALVE
COMBINATION VALVE
FROM PRIORITY ANDSTEERING RELIEF VALVE
TO SIGNAL BLEEDAND SIGNAL PRESSURE
RELIEF VALVES
SIGNALCHECKVALVE
SIGNAL NETWORKRIGHT BLADE LIFT
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LEFT BLADE LIFT
SIDESHIFT
BLADETIP
CIRCLE DRIVE
LEFT IMPLEMENT CONTROL VALVESHOLD
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ARTICULATION CENTER SHIFT WHEEL LEAN RIGHT BLADE LIFT
RIGHT IMPLEMENT CONTROL VALVESHOLD
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FROMPUMP
TO TANK
TO TANK
PORT BPORT A
LOCK VALVE
PISTON
LOCK VALVE POPPETLOCK VALVE
POPPET
LOCK VALVE SEATS
COMPENSATOR VALVE
SIGNALCHECK BALLCONTROL
STEM
TYPICALIMPLEMENT VALVE
HOLD
ROTARYACTUATOR
MANIFOLD
TOCOMBINATION
VALVE
COUNTERBALANCESPRING
CENTERING SPRING
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SIGNAL
CHECK BALLFROMPUMP
COMPENSATORVALVE
CONTROLSTEM
BLADE LIFT VALVE
HOLD
MANIFOLD
TO COMBINATIONVALVE
TO TANK
TOTANK
TOROD END
TOHEAD END
LOCK VALVEPISTONS
LOCK VALVEPOPPET
LOCK VALVEPOPPET
LOCK VALVE SEATS
ROTARYACTUATOR
ROD END LINERELIEF VALVE
DETENTSPRING
CENTERING
SPRING
COUNTERBALANCESPRING
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SIGNALCHECK BALL
FROM
PUMP
PORT BPORT A
COMPENSATORVALVE
CONTROLSTEM
BLADE LIFT VALVEFULLY SHIFTED TO THE RIGHT
MANIFOLD
TO COMBINATIONVALVE
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TO TANK
PORT BPORT A
COMPENSATORVALVE
CONTROLSTEM
FROM PUMP
PORT BPORT A
COMPENSATORVALVE
SIGNALCHECK BALL
(OPEN) FROM PUMP
SIGNALCHECK BALL
(SEATED)
MANIFOLD
IMPLEMENT VALVE WITHHIGHEST LOAD
IMPLEMENT VALVE WITHLOWEST LOAD
TOCOMBINATION
VALVE
TYPICALIMPLEMENT VALVES
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924G/924Gz Wheel Loaders
PPPC Hydraulic System
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M300 Wheeled Excavators
PPPC Hydraulic System
BUCKETSTICK BOOM
M300 SERIES EXCAVATOR HYDRAULIC SYSTEMGENERATION 2 AND 4 MACHINES
PILOT AND IMPLEMENT HYDRAULIC SYSTEMS
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PILOT MANIFOLD
OIL
COOLER
RETURN
MANIFOLD
SWING
PUMP
MAIN
PUMP
BRAKE
AND
STEERING
PUMPS
DOZER
PILOT
VALVE
STICK
AND
SWING
PILOT
VALVE
TRAVEL
PILOT
VALVE
BOOM AND
BUCKET
PILOT
VALVE
MAIN CONTROL VALVE GROUP
SWING
MOTOR
TO DOZERBLADE/
STABILIZERS
A
WHEEL BRAKE
VALVE
STEERING
VALVE
TRAVEL
MOTOR
TRANSMISSIONTO
BRAKES
TO L
ATT
TO
SWING
PUMP
TRANSMISSION
SHIFT
PARKING
BRAKE
CONTROL
GOVERNORACTUATOR
MOTOR
ENGINE
LOAD
M312/M315/M318
MAIN PUMP CONTRO
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A
SENSING
SPOOL
LEVER
POWER SHIFT
PRESSURE PISTON
ACTUATOR PISTON
SECTION A - A
LEVER
A
MARGIN PRESSURE
ADJUSTMENT SCREW
SIGNALLIMITER VALVE
COMPONENTS
POWER SHIFT
PRESSURE
FROM MAIN
PUMP PRV
MAXIMUM ANGLE PISTON
MINIMUM ANGLE
PISTON
HORSEPOWER CONTROL SPOOL
LOAD SENSING
ORIFICE SPOOL
LOAD SENSING
ORIFICE ADJUSTMENT
SCREW
LOAD SENSING ORIFICE
HORSEPOWER
ADJUSTMENT SCREW
HORSEPOWER
CONTROL SPOOL
MAIN RELIEF
VALVE
PUMP
SUPPLY
CONT
PRES
LOAD SENSING
SIGNAL
MAIN CONTROL
VALVE
TO IMPLEMENTS
PIVOT PIN
CONTROL VALVE
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SHOCK
VA
PORT A PORT B
TRAV
S
LINE RELIEF AND
MAKEUP VALVE
COMPENSATOR VALVE
LOAD CHECK VALVE
SIGNAL
PUMP
SUPPLYFROM
JOYSTICK
FROM
JOYSTICK
CONTROL
SPOOL
LOAD SENSING
PORT
CONTROL VALVENEUTRAL
FEEDER
PASSAGE
TO SIGNALCOMPENSATOR VALVES
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HIGH CIRCUIT
PRESSURE
NEUTRAL LOW CIRCUIT
PRESSURE
CONTROL
SPOOL
FEEDER
PASSAGE
PASSAGE TO
CYLINDER
LOAD
SENSING
PORT
SUPPLYOIL
CROSS-DRILLED
PASSAGE
SIGNAL
COM
TO PUMP
CONTROLS
TO SIGNAL
LIMITER VALVECOMPENSATOR VALVES
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PUMP
SUPPLY
FROM
JOYSTICK
SHOCK REDUCING
VALVE
PORT A PORT B
LINE RELIEF AND
MAKEUP VALVE
COMPENSATOR VALVE
LOAD CHECK
VALVE
SIGNAL
FEEDER
PASSAGE
CONTROL VALVEHIGH PRESSURE
CONTROL VALVE
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PUMP
SUPPLYFROM
JOYSTICK
SHOCK R
VA
PORT A PORT B
LINE RELIEF AN
MAKEUP VALVE
COMPENSATOR VALVE
LOAD CHECK
VALVE
SIGNAL
FEEDER
PASSAGE
LOW PRESSURE
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'B' Series Telehandlers
PPPC Hydraulic System
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PHS
SOLENOID
IMPLEMENTELECTRONIC
JOYSTICK
PWMSIGNAL
CATERPILLARELECTRONIC
TECHNICIAN(ET)
% NORMALIZEDLEVER POSITION
% VALVECOMMAND
CURRENT
PHS CAN
DATA LINK
CATDATA LINK
PHS PILOT MODULE
% VALVECOMMAND
+10 V POWER SUPPLYADDRESS LINE IN
ADDRESS LINE OUT
PHS DATA LINK +
PHS DATA LINK -
+12 V BATTERY
GROUNDMACHINE
ECM PHSECM
PROGRAMMABLE HYDRAULIC SYSTEM (PHS)ELECTRICAL BLOCK DIAGRAM
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