Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 33. AUTOMATIC TRANSMISSION 01. AUTOMATIC TRANSMISSION
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W1860BE.book Page 2 Tuesday, January 28, 2003 11:01 PM
OIL PUMP
AUTOMATIC TRANSMISSION
1. Oil Pump
A: CONSTRUCTION
The pump consists of a parachoid rotor pair, a housing and a cover. The inner rotor has nine teeth
and the outer rotor has ten teeth.
(8)
(7)
(9)
(2) (5)
(3)
(1)
(6)
(4) AT-00461
(1) Oil pump housing (4) Gasket (7) Oil pump cover
(2) Hose (5) Inner rotor (8) Seal ring
(3) Nipple (6) Outer rotor (9) Thrust bearing
B: FUNCTION
The pump draws automatic transmission fluid (ATF) from the oil pan through the oil strainer locat-
ed under the hydraulic control valve assembly. The ATF then flows through a passage in the trans-
mission case, and after passing through the oil pump housing and oil pump cover, it enters the
suction port.
As the inner rotor rotates, the outer rotor also rotates. This motion causes the ATF to be sucked
up through the suction port and discharged from the discharged port.
The discharged ATF flows through a passage in the oil pump cover and then a passage in the oil
pump housing. It then goes through a passage in the transmission case to the pressure regulator
valve in the control valve assembly, from which the ATF is directed to various clutches, brakes, and
torque converter lockup clutch for acting as hydraulic fluid and lubricating oil. Part of the ATF also
flows, directly and after passing through the regulator valve, to the manual valve, from where it is
distributed to the circuit corresponding to the range selected by the selector lever.
As engine speed increases, the delivery rate of the oil pump also increases.
4AT-2
W1860BE.book Page 3 Tuesday, January 28, 2003 11:01 PM
OIL PUMP
AUTOMATIC TRANSMISSION
x
(1)
(8) (9)
(10)
(2)
x
(3)
(4)
(5)
(7)
(14)
(11)
(6)
(12)
(13)
AT-00462
(1) To torque converter regulator valve (8) Oil pump housing
(2) To manual valve (9) Outer rotor
(3) From reverse clutch (10) Inner rotor
(4) From pressure modifier valve (11) Suction port
(5) Pressure regulator valve (12) Oil strainer
(6) To manual valve (13) Oil pan
(7) Delivery port (14) Line pressure
4AT-3
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