2022.10.7
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TRSM0940 Appendix | Power Flow
Power Flow
Front Section Power Flow
Note: The heavy lines in the image below outline the power
flow description below.
1. Power (torque) from the engine is transferred to
the transmission’s Input Shaft.
2. The Input Shaft rotates the Main Drive Gear
through internal splines in the hub of the gear.
3. The Main Drive Gear meshes with both Counter
Shaft driven gears, and the torque is split between
both Counter Shafts.
4. Because the Counter Shaft gears are in constant
mesh with the Main Shaft gears, all the front sec-
tion gearing rotates. However, only the engaged
Main Shaft gear will have torque. External clutching
teeth on the sliding clutch will engage internal
clutching teeth on the selected Main Shaft gear.
Torque will now be provided from both opposing
Counter Shaft gears, into the engaged Main Shaft
gear, and through the sliding clutch to the front
section Main Shaft.
5. The rear of the front section Main Shaft is splined
into the Auxiliary Drive Gear, and torque is now
delivered to the Auxiliary Section.
Front Section Power Flow - Direct Gear
In direct gear (5th/10th for FA model, 4th/9th for FAO
model), the front sliding clutch is moved forward and
engages into the back of the Main Drive Gear. Torque will
flow from the Input Shaft to the Main Drive Gear, Main Drive
Gear to sliding clutch, sliding clutch straight into the front
section Main Shaft which delivers the torque to the Auxil-
iary Drive Gear.
Note: All Counter Shaft and Main Shaft gears will rotate, but
not all gears will be loaded.
Front Section Torque (1st Gear)
5th Gear FM, 4th Gear FO & FOM
10th Gear FM, 9th Gear FO & FOM
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