| 摘要 |
A creeper speed mechanism includes a speed reduction gearset driven by an engine through selectively engaged, hydraulically actuated clutches, which are pressurized and vented alternately to produce a high speed ratio and a low speed ratio gear reduction between the engine and the creeper speed mechanism. A coupler connects alternately the creeper speed mechanism and the engine to the transmission input shaft in accordance with the position of a shift rail slidably mounted within the transmission casing. The hydraulic system that actuates the clutches pressurizes a cylinder and moves the shift rail and coupler to engage the creeper speed mechanism. A compression spring moves the coupler away from the creeper speed mechanism and toward engagement with the clutch output. The clutches are vented each time the coupler is moved to a neutral position out of engagement with the creeper speed mechanism and the clutch output.
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