Mechanical Shift Lock Type

The mechanical type uses mechanical control of the shift lock mechanism and the key lock mechanism. A cable extends from the brake pedal bracket to the shift lever control shaft bracket. A lock pin engages the shift lever shaft to lock in into the Park position until the brakes are applied.

The cable (wire) end on the brake pedal bracket is mounted just below the stop light switch. The plunger is attached to the cable and is mounted in a wire guide and is able to slide in and out. When the brake pedal is not depressed, the plunger is held in position by the brake pedal return spring.

The other end of the cable is attached to a lock pin located in the shift lever control shaft bracket. The lock pin is spring loaded to release the lock pin from the inner shaft of the shift lever.

Shift Lever Cable End

Shift Lever Control Shaft Bracket

No. 2 Return Spring Piston

No. 1 Return Spring

Shift Lever Control Shaft Bracket

No. 2 Return Spring Piston

No. 1 Return Spring

Cylindi

Cylindi

Lock Pin

A - A' Cross Section

Shift Lever Cable End

Lock Pin

A - A' Cross Section

Shift Lever Cable End

When the shift lever is in the Park range and brakes are not applied, the cable compresses the No. 1 return spring and pushes the lock pin engaging the round hole in the inner shaft, locking the shift lever in Park

When the brakes are applied with the transmission in Park, the No. 1 spring pushes the cable, lock pin and plunger out toward the brake pedal. With the plunger released, the shift lever can be moved from Park.

When the shift lever is in positions other than Park with the brakes released, the brake pedal return spring pushes the plunger and cable back toward the shift lever control shaft. The lock pin cannot enter the inner shaft, so the No. 2 return spring compresses. With the lock pin spring loaded, when the gear selector is moved to the Park position, it will immediately lock.

Reprinted with permission by Toyota Motor Sales, USA, Inc., from the Automatic Transmission Course #262 textbook.

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