F 250 2WD Pickup V8-7.3L DSL (1990)
Clutch: Description and Operation
Center Support Clutch
WITH E4OD
DESCRIPTION AND OPERATION
The center support provides a flow path for fluid to activate the forward and direct clutches and lubricate the intermediate circuit. The center support also
acts as a pilot for the intermediate brake drum.
Coast Clutch
DESCRIPTION AND OPERATION
The coast clutch prevents the overdrive one-way clutch from overrunning during coast. The coast clutch locks the coast clutch cylinder and the overdrive
sun gear to the overdrive ring gear when the transmission selector lever is in Overdrive and the overdrive cancel switch is depressed or when manual one
or two is selected.
Direct Clutch
DESCRIPTION AND OPERATION
The direct clutch holds the forward clutch cylinder to the intermediate brake drum during third, fourth, and reverse gears.
Forward Clutch
DESCRIPTION AND OPERATION
The forward clutch holds the forward clutch cylinder to the forward ring gear during all forward gears.
Intermediate Clutch
DESCRIPTION AND OPERATION
The intermediate clutch holds the outer race of the intermediate one-way clutch to the case during second, third, and fourth gears.
The intermediate one-way sprag clutch holds the intermediate clutch to the intermediate brake drum, input shell, and forward-reverse sun gear during
drive in second gear and overruns in coast, third, and fourth gear.
The intermediate/overdrive cylinder provides a fluid path to activate the intermediate and overdrive clutches.
Low Reverse Clutch
WITH E4OD
DESCRIPTION AND OPERATION
The low-reverse one-way roller clutch holds the reverse hub and the reverse planetary carrier to the case during drive in first gear and overruns in coast
and all other forward gears.
Overdrive Clutch
DESCRIPTION AND OPERATION
The overdrive clutch holds the coast clutch cylinder and overdrive sun gear to the case during fourth gear. The overdrive clutch also enables the
overdrive planetary gear to walk around the sun gear and the overdrive ring gear.
The overdrive one-way sprag clutch holds the overdrive ring gear to the overdrive sun gear during drive in first, second, and third gear and overruns
during coast and fourth gear.
The intermediate/overdrive cylinder provides a fluid path to activate the intermediate and overdrive clutches.
Reverse Clutch
DESCRIPTION AND OPERATION
The reverse clutch holds the reverse hub to the case during reverse and manual one. The reverse clutch also prevents the low-reverse one-way clutch
from overrunning during reverse and coast in manual one.
