TRUCK SERVICE MANUAL
TRANSMISSION
DESCRIPTION AND OPERATION
Para 2-28
FIRST - GEAR
Fig. 2-9. First-gear
d. First-Gear Operation (fig. 2-9). Engine torque is
to the main shaft and rotates with it and, in turn, rotates
transmitted through the torque converter as described in
the low planetary pinions. The pinions are part of the low
a, above. The forward and low clutches are applied.
carrier assembly which is splined to the transmission
The low clutch application anchors the rear planetary ring
output shaft. With the low ring gear held stationary by
gear against rotation. The forward clutch application
the applied low clutch and the low sungear rotating the
locks the turbine shaft and transmission main shaft
pinions, the low planetary carrier must rotate within the
together so that they rotate as a unit. The low sun gear
ring gear and drive the output shaft at a speed reduction
is splined
of 3. 19:1.
693