740 ARTIICULATED TRUCK POWER TRAIN

740

777744440000 AAAARRRRTTTTIIIICCCCUUUULLLLAAAATTTTEEEEDDDD TTTTRRRRUUUUCCCCKKKKPPPPOOOOWWWWEEEERRRR TTTTRRRRAAAAIIIINNNN

2001 Caterpillar Inc.

CDOWNSHIFTSOLENOID

UPSHIFTSOLENOID

FILTERROTARY

ACTUATOR

SELECTORVALVEGROUP

ROTARYSELECTOR

SPOOL

NEUTRALIZERVALVE

PRIORITYREDUCTION

VALVE

LUBERELIEF VALVE

RELIEFVALVE

A

B

D

E

F

G

H

PUMPPRESSURE

DOWNSHIFTPRESSURE

PILOT OILPRESSURE

LUBEPRESSURE

740 TRANSMISSIONHYDRAULIC SYSTEM

NEUTRALUPSHIFT

PRESSURE

ON

PRESSURE CONTROLGROUP

T/C LOCKUPSOLENOID

TORQUE CONVERTERSUMP

TRANSMISSIONPUMP

CHARGEPUMP

MAGNETICSCREEN

SOLENOIDVALVE

PRIORITYVALVE

RELIEFVALVE

INTERAXLEDIFFERENTIAL

TRANSFERGEAR

AXLE AXLE AXLE

OUTPUT TRANSFER GEAR HYDRAULIC CIRCUITDIFFERENTIAL LOCKS RELEASED

SOLENOIDVALVE

CHARGEPUMP

MAGNETICSCREEN

SOLENOIDVALVE

PRIORITYVALVE

RELIEFVALVE

INTERAXLEDIFFERENTIAL

TRANSFERGEAR

AXLE AXLE AXLE

OUTPUT TRANSFER GEAR HYDRAULIC CIRCUITINTERAXLE LOCK ENGAGED

SOLENOIDVALVE

CHARGEPUMP

MAGNETICSCREEN

SOLENOIDVALVE

PRIORITYVALVE

RELIEFVALVE

INTERAXLEDIFFERENTIAL

TRANSFERGEAR

AXLE AXLE AXLE

OUTPUT TRANSFER GEAR HYDRAULIC CIRCUITINTERAXLE AND DIFFERENTIAL LOCKS ENGAGED

SOLENOIDVALVE

CDOWNSHIFTSOLENOID

UPSHIFTSOLENOID

TORQUE CONVERTERSUMP

TRANSMISSIONPUMP

FILTERROTARY

ACTUATOR

SELECTORVALVEGROUP

ROTARYSELECTOR

SPOOL

NEUTRALIZERVALVE

PRIORITYREDUCTION

VALVE

LUBERELIEF VALVE

RELIEFVALVE

A

B

D

E

F

G

H

PUMPPRESSURE

DOWNSHIFTPRESSURE

PILOT OILPRESSURE

LUBEPRESSURE

740 TRANSMISSIONHYDRAULIC SYSTEM

NEUTRALUPSHIFT

PRESSURE

ON

PRESSURE CONTROLGROUP

T/C LOCKUPSOLENOID

JI

H

GF

E

D

C

B

A

10 9 8 7 6 4 3 2 1

GND VERIFYGEAR 5GEAR 4+ BATT

GEAR 3GEAR 2GEAR 1

GROUND

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10

TRANSMISSIONGEAR POSITION

SWITCH

CA

B

D

E

F

G

H

TRANSMISSION PRESSURECONTROL VALVE

NEUTRAL

FROM SELECTORAND PRESSURE

CONTROL VALVE

MODULATIONREDUCTION VALVE

(STATION DFOR T/C LOCKUP CLUTCH)

MODULATIONREDUCTION VALVES

(STATIONS A, B, C, E, F, G AND HFOR TRANS. PLANETARY)

FROM SELECTOR AND

PRESSURE CONTROLVALVE

LOAD PISTONBODY

FROM SELECTOR ANDPRESSURE

CONTROL VALVEPUMP

PASSAGEPRESSURE

CONTROL VALVE

LOAD PISTONORIFICE

TOTANK

TO TANK

PISTONPASSAGE SELECTOR

PISTONLOAD

PISTONMODULATION

REDUCTION VALVE

FROM SELECTIONAND PRESSURE

CONTROL VALVE

TRANSMISSION PLANETARYVALVE STATION

CLUTCH FILLING

TRANSMISSION PLANETARYVALVE STATION

CLUTCH ENGAGED

TO TRANSMISSIONLUBE

TRANSMISSION PLANETARYVALVE STATION

CLUTCH DECAY

DECAYORIFICE

FROMT/C LOCKUPSOLENOID

TO TANK

FROMSELECTOR AND

PRESSURECONTROL VALVE

LOAD PISTONORIFICE

BALLCHECKVALVE

MODULATIONREDUCTION

VALVE

SELECTORPISTON

LOADPISTON

TORQUE CONVERTER LOCKUP VALVE STATION

ROTARYSELECTOR

SPOOLNEUTRALIZERVALVE

PRIORITYREDUCTION

VALVE

LUBERELIEF VALVE

RELIEF VALVE

LUBRICATIONPRESSURE TAP

PILOT OILPRESSURE TAP

SCREEN

TO TRANSMISSIONPRESSURE

CONTROL VALVE

TO TRANSMISSIONPRESSURE

CONTROL VALVE

FROMTRANSMISSION

PUMP

740 TRANSMISSIONSELECTOR VALVE GROUP

NEUTRAL

ON

DOWNSHIFTSOLENOID

UPSHIFTSOLENOID

FROM TRANSMISSIONOIL FILTER

ROTOR

ROTARYVANE

STATIONARYVANE

UPSHIFTVALVE

BALL

BALL

TOTANK

DOWNSHIFTVALVE

12

3

45 6 7

RN

TRANSMISSION ROTARY ACTUATOR