John Deere Funk RC (7005 & 45001 Assembly) Transmission Instructions and Parts Manual (4005055)

The Revers-O-Matic Drive consists of a pair of hydraulically actuated multiple disc clutches. When the front clutch is engaged, the output shaft turns engine-wise and in most applications this produces forward motion. The rear clutch is driven by a simple gear train and its rotation is opposite to the front clutch. Therefore, when the rear clutch is engaged, the output shaft turns anti-engine wise and in most applications this produces rearward motion.

In most applications, power is transmitted from an engine to the Revers-O-Matic Drive through a torque converter. The use of a torque converter, although not imperative, has two distinct advantages. First, the converter is essentially a fluid drive, there being no direct mechanical connection through it. This feature creates a very smooth and shock-free drive with the elimination of engine stalling and lugging. Secondly, the converter multiplies torque, but only during heavy pull-down loads. When loads are light, the converter transmits the engine power directly at almost engine speed and there is no torque multiplication. The net result is an action like a transmission, with infinitely variable and automatic speed ratios. The need for shifting gears, although present, is greatly reduced.

The Revers-O-Matic Drive is equipped with a very unique control system; this being a device that sorts out motions from a single hand lever or double foot accelerator pedals that first engages one of the clutches and then accelerates the engine as the lever or pedal is moved further. Therefore, it is a unified control that regulates both the direction of travel and the speed of travel.

Movement of the lever from a neutral position in one direction produces forward motion, and opposite movement of the lever produces rearward motion. The action of the foot pedals is essentially the same, except that one pedal produces forward motion and the other rearward motion.
As the control system engages the clutches before applying the power, the clutches are not power absorbing members and cannot be subjected to slippage under power. This arrangement greatly increases the life of the clutches. Model numbers starting with “T” are equipped with four plate clutches. Model numbers starting with “R” are equipped with six plate clutches.