Subaru 2002 Impreza Service Manual page 264

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
leftward 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 1 st 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, re-
spectively, and he selector arm is inserted in the notch through the slot.
MT-4