Honda 2004 Odyssey Service Manual page 877

Automatic Transmission
System Description (cont'd)
Clutches
The 5-speed automatic transmission uses hydraulically-actuated clutches to engage or disengage the transmission
gears. When hydraulic pressure is introduced into the clutch drum, the clutch piston moves. This presses the friction
discs and steel plates together, locking them so they don't slip. Power is then transmitted through the engaged clutch
pack to its hub-mounted gear. Likewise, when the hydraulic pressure is bled from the clutch pack, the piston releases
the friction discs and the steel plates, and they are free to slide past each other. This allows the gear to spin
independently on its shaft, transmitting no power.
1st Clutch
The 1st clutch engages/disengages 1st gear, and is located at the middle of the secondary shaft. The 1st clutch is
joined back-to-back to the 2nd clutch. The 1st clutch is supplied hydraulic pressure by its ATF feed pipe within the
secondary shaft.
1st-hold Clutch
The 1st-hold clutch engages/disengages 1st-hold, and is located in the 1st clutch drum. The 1st-hold clutch is supplied
hydraulic pressure through the orifice inside the secondary shaft by a circuit connected to the internal hydraulic circuit.
2nd Clutch
The 2nd clutch engages/disengages 2nd gear, and is located at the middle of the secondary shaft. The 2nd clutch is
joined back-to-back to the 1st clutch. The 2nd clutch is supplied hydraulic pressure through the secondary shaft by a
circuit connected to the internal hydraulic circuit.
3rd Clutch
The 3rd clutch engages/disengages 3rd gear, and is located at the end of the countershaft, just behind the end cover.
The 3rd clutch is supplied hydraulic pressure by its ATF feed pipe in the countershaft.
4th Clutch
The 4th clutch engages/disengages 4th gear, and is located at the middle of the mainshaft. The 4th clutch is joined
back-to-back to the 5th clutch. The 4th clutch is supplied hydraulic pressure by its ATF feed pipe within the mainshaft.
5th Clutch
The 5th clutch engages/disengages 5th gear, as well as reverse gear, and is located at the middle of the mainshaft. The
5th clutch is joined back-to-back to the 4th clutch. The 5th clutch is supplied hydraulic pressure by its ATF feed pipe
within the mainshaft.
One-way Clutch
The one-way clutch is positioned between the 1st clutch hub and the secondary shaft 1st gear. The secondary shaft 1st
gear is splined to the 1st-hold clutch hub, with the 1st-hold clutch hub splined to the secondary shaft. The secondary
shaft 1st gear provides the outer race surface, and the 1st clutch hub provides the inner race surface. The one-way
clutch locks when power is transmitted from the secondary shaft 1st gear to the countershaft 1st gear. The 1st clutch
and gears remain engaged in the 1st, 2nd, 3rd, 4th, and 5th gear ranges in the D, D3, or 2 position.
However, the one-way clutch disengages when the 2nd, 3rd, 4th, or 5th clutches and gears are applied in the D, D3, or
2 position. This is because the increased rotational speed of the gears on the secondary shaft causes the one-way
clutch to free-wheel with the 1st clutch still engaged.
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