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 34. MANUAL TRANSMISSION AND DIFFERENTIAL (5MT) 02. Reverse Check Mechanism
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W1860BE.book Page 4 Tuesday, January 28, 2003 11:01 PM
REVERSE CHECK MECHANISM
MANUAL TRANSMISSION AND DIFFERENTIAL
2. Reverse Check Mechanism
Located in the transfer case, the reverse check mechanism prevents a direct 5th-to-reverse shift by
using a selector arm and cam combination which allows the gear to be shifted into the reverse only
after it has been returned once into the neutral.
A: CONSTRUCTION
The construction of the reverse check mechanism is as shown in the drawing on the opposing page.
The reverse check sleeve is bolted to the transfer case and houses the mechanism's main compo-
nents.
The reverse accent shaft is slidable inside the reverse check sleeve and its smaller-diameter end is
fitted with the reverse check cam. The cam is rotatable and axially movable on the shaft but its left-
ward movement is restricted by a step formed on the sleeve's inner wall.
The reverse accent shaft has hollows in both ends. In the left end hollow are the 1st return spring
and its cap and in the right end hollow is the reverse return spring which pushes the shaft leftward.
Around the check cam is the reverse check spring whose left end applies simultaneous leftward and
rotational forces to the cam.
Both the reverse check spring and reverse return spring are retained at their right ends by the re-
verse check plate which is held in place by the snap ring.
The reverse accent shaft has a V-groove in which the detent ball is pressed by the reverse accent
spring fitted through the hole in the reverse check sleeve.
The reverse check sleeve and reverse accent shaft have a slot and a notch at their bottoms, respec-
tively, and the selector arm is inserted in the notch through the slot.
(3)
(1) (2) (4) (5) (6) (7) (9) (8) (10)
(14) (13) (12) (11) MT-00321
(1) Select adjust shim (6) Reverse check cam (11) Selector arm
(2) Detent ball (7) Reverse return spring (12) Spring cap
(3) Reverse accent spring (8) Snap ring (13) 1st return spring
(4) Reverse check sleeve (9) Reverse check spring (14) O-ring
(5) Reverse accent shaft (10) Reverse check plate
5MT-4
W1860BE.book Page 5 Tuesday, January 28, 2003 11:01 PM
REVERSE CHECK MECHANISM
MANUAL TRANSMISSION AND DIFFERENTIAL
B: OPERATION
The drawing below shows the state of the reverse check mechanism when the selector arm is in the
neutral position. The 1st and 2nd gears will be selected if the selector arm is moved leftward from
this point to a stop and then turned in either way. A rightward movement of the arm to a stop will
enable selection of the 5th and reverse gears. In the neutral position, the selector arm receives a
rightward force (force toward the 5th and reverse gear side) from the 1st return spring and a leftward
force (force toward the 1st and 2nd gear side) from the reverse return spring to stay in that position.
The following explanation describes how the selector arm and reverse check mechanism operate
when the driver selects the 5th gear and then selects the reverse gear.
(1) (2) (3)
(5) (4)
(6) MT-00322
(1) 1st return spring (3) Reverse accent shaft (5) 5th and reverse gear side
(2) Reverse check sleeve (4) Reverse return spring (6) 1st and 2nd gear side
5MT-5
W1860BE.book Page 6 Tuesday, January 28, 2003 11:01 PM
REVERSE CHECK MECHANISM
MANUAL TRANSMISSION AND DIFFERENTIAL
1. WHEN SELECTOR ARM IS MOVED TOWARD 5TH AND REVERSE GEAR SIDE
The selector arm moves rightward while pushing both the reverse accent shaft and reverse check
cam simultaneously.
(1) (2) (3) (1) (3) (2)
A
A
(4)
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