307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50	2013 - 2014 MKZ
Description and Operation	Procedure revision date: 09/21/2012

Low/Reverse Clutch Assembly

Low-Reverse Clutch Exploded View

Item	Description
1	Cover assembly
2	Low/reverse clutch piston
3	Low/reverse clutch piston return spring
4	Low/reverse clutch return spring snap ring
5	Low/reverse clutch steel plates
6	Low/reverse clutch friction plates
7	Rear planetary carrier
8	Low One-Way Clutch (OWC) snap ring
9	Low One-Way Clutch (OWC)
10	Transmission case

Low-Reverse Clutch Mechanical Operation

The low/reverse clutch is a brake clutch that holds the low One-Way Clutch (OWC) which is splined to the rear planetary carrier. The low/reverse clutch is applied in manual LOW, REVERSE and 1st gear up to 8 kmh (5 mph).

Hydraulic pressure from the regulator valve, routed through the multiplex shift valve in the valve body, pushes the low/reverse clutch piston against the low/reverse clutch pack to apply the clutch. The rear planetary carrier is held stationary to the transmission case as a result of the clutch being applied.

Low-Reverse Clutch Hydraulic Circuits (Applied in REVERSE)

When the low-reverse clutch is applied in REVERSE, LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the REV hydraulic circuit to move the valve. Line pressure is also supplied to the low-reverse/overdrive clutch regulator valve from the pump. The lowreverse/ overdrive clutch regulator valve is controlled by Shift Solenoid D (SSD) and directs regulated pressure to the multiplex shift valve. The multiplex shift valve directs the regulated pressure to the low-reverse clutch through the CBLR SUPPLY circuit.

Low-Reverse Clutch Hydraulic Circuits (Applied in PARK, LOW and 1st Gear Below 8 kmh [5 mph])

When the low-reverse clutch is applied in PARK, LOW or 1st gear below 8 kmh (5 mph), Shift Solenoid E (SSE) pressure is supplied to the multiplex shift valve to move the valve. LINE pressure is supplied to the lowreverse/ overdrive clutch regulator valve from the pump. The low-reverse/overdrive clutch regulator valve is controlled by Shift Solenoid D (SSD) and directs regulated pressure to the multiplex shift valve. The multiplex shift valve directs the regulated pressure to the low-reverse clutch through the CBLR SUPPLY circuit.

For details on valve body hydraulic circuits and solenoid operation.
For additional information, refer to: Transmission Description - System Operation and Component Description (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Description and Operation).