Gear Box: Disassembly

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 1991 Pontiac Grand Prix, 1991 Pontiac Grand Am, 1991 Pontiac Firebird, 1991 Pontiac Bonneville, and 1991 Pontiac 6000. However, it is still accessible from the selected car via links, so may be relevant.

With wiper motor removed from vehicle, remove crank arm retaining nut. Disconnect crank arm. Remove rubber seal cap and thrust collar or retaining ring. See Fig 1 and Fig 2 .
Remove shim washers, shield and spacer washer. Remove park switch assembly. Remove large gear, inner spacer washer, intermediate gear retainer and intermediate gear. When removing large gear, latch arm must be out of way. See Fig 3 . Disassemble drive plate and shaft assembly.

Fig 1: Exploded View of Wiper Motor Assembly

Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing Thrust Collar/Ring

Courtesy of GENERAL MOTORS CORP.

Fig 3: Identifying Wiper Motor Gear Components

Courtesy of GENERAL MOTORS CORP.