5.3 Transmission Operation

TRANSMISSION OPERATION                                                                                                               5.3
POWER FLOW                                                            First Gear
See Figure 5-1. The 6-speed transmission consists of two              When the transmission is shifted into first gear (1 ). the
parallel shafts supporting six gears each:                            first/fourth shift fork engages first gear to the output shaft.

• Input shaft which supports the clutch                               Second Gear
• Output shaft which supports the transmission sprocket               When the transmission is shifted into second gear (2), the
                                                                      second/third shift fork engages second gear to the output shaft.
Each gear on the input shaft is in constant mesh with a
corresponding gear on the output shaft. Each of these six pairs
of gears makes up a different speed in the transmission.
                                                                      Third Gear
                                                                      When the transmission is shifted into third gear (3), the
The transmission gears are divided into two types. gears that
                                                                      second/third shift fork engages third gear to the output shaft.
rotate with the shaft, and gears that spin freely on the shaft. A
gear that rotates with the shaft always meshes with a
                                                                      Fourth Gear
freewheeling gear.
                                                                      When the transmission is shifted into fourth gear (4), the
Three forks are used to shift gears. A drum-shaped shifter,
                                                                      first/fourth shift fork engages fourth gear to the output shaft.
next to the input and output shafts, controls the position of the
shifter forks.
                                                                      Fifth Gear
Neutral                                                               When the transmission is shifted into fifth gear (5), the fifth/sixth
                                                                      shift fork engages fifth gear to the output shaft.
Power is introduced to the transmission through the clutch. In
neutral with the clutch engaged, the input shaft first, second,
                                                                      Sixth Gear
third and fourth gears are rotating. No power is transferred to
the output shaft since output shaft first, second, third and fourth   When the transmission is shifted into sixth gear (6), the
gears are freewheeling gears.                                         fifth/sixth shift fork engages sixth gear to the output shaft.

94000784                                                                                                                               5-3
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                                                                   ...
               0                                         0
      1.   First gear                         4.   Fourth gear
      2.   Second gear                        5.   Fifth gear
      3.   Third gear                         6.   Sixth gear
                         Figure 5-1. Transmission Power Flow

5-4                                                              94000784