Low/Reverse (1, R) Clutch Hydraulic Circuits

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

To apply the low/reverse (1, R) clutch, the manual valve can be in any position. Line pressure is supplied by the pump to the low/reverse (1, R) clutch regulator and latch valves through the LP circuit. The low/reverse (1, R) clutch has 2 application circuits, CBLRS (static apply) and CBLRD (dynamic apply). The static apply circuit is supplied line pressure through the low/reverse latch valve. The dynamic apply circuit is supplied regulated line pressure from the low/reverse regulator valve. For the low/reverse (1, R) clutch to apply in REVERSE, the manual valve provides line pressure to the direct (3, 5, R) clutch latch valve through the R hydraulic circuit. With the direct (3, 5, R) clutch latch valve in position to apply the direct (3, 5, R) clutch, it opens the R hydraulic circuit to the PC4R circuit. When the low/reverse (1, R) clutch latch valve moves, it opens the LP hydraulic circuit to the CBLRS circuit for static application of the low/reverse (1, R) clutch. As the low/reverse (1, R) clutch regulator valve moves, it opens the LP hydraulic circuit to the CBLRD circuit to supply regulated line pressure for dynamic application of the low/reverse (1, R) clutch. The low/reverse (1, R) clutch latch valve directs regulated line pressure from the CBLRD hydraulic circuit to the opposite side of the low/reverse (1, R) clutch regulator valve through the CBLRFB circuit for controlled low/reverse (1, R) clutch engagement.