John Deere Funk 12000 Series Revers O Matic Transmission Repair Manual (4005055 & 4005056)

Table of Content ( ASSEMBLY/DISASSEMBLY MANUAL – 4012026)
Parts Ordering Instructions
Table of Contents
Description
Operation
Service Information
Trouble Shooting
Check List
12000 Shuttle Transmission
12700 4 Speed Transmission
11% Converter
13″ Converter
The MODEL 12000 REVERS-O-MATIC DRIVE is a shuttle type transmission consisting basically of (2) two hydraulically actuated multiple disc clutches. When the front clutch is engaged, the output shaft rotates engine wise and in most applications forward vehicular motion is obtained. The rear clutch is driven by an idler/- countershaft gear train and its rotation is opposite to that of the front clutch. Therefore, when the rear clutch is engaged, the output shaft rotates anti-engine wise and in most applications rearward vehicular motion is obtained.
Power is transmitted from an engine to the Revers-O-Matic Drive through the use of a torque converter. Being no direct mechanical connection between power and load, a very smooth and shock-free drive is obtained with complete absence of engine stalling and lugging. Consequently the maintenance of axles, bearings, differentials, and gears is reduced to a minimum. Another feature of torque converter drive is the automatic multiplication of engine torque during the periods of heavy pull-down loads. When loads are light, the converter transmits the engine power directly at almost engine speed without torque multiplication. With the output torque automatically adjusting to the load demand, 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 along with drive fatigue
The Model 12000 Revers-O-Matic Drive is equipped with a unified control system that regulated both the direction of travel and the speed of travel. This is generally accomplished thru the use of a single hand lever control. Sideways movement of the control lever from the neutral (center) position engaged one of the hydraulically actuated clutched; either forward or reverse. Back and forth movement of the lever controls the speed of travel. The unit is also available with a double pedal set-up. The action of the foot pedals is essentially the same as the hand lever control except that one pedal produces forward motion and the other rearward motion.
The hand lever control can be supplied in either a self-centering or three position valve design.
As the control system engages the clutches prior to engine acceleration, the clutches are not power absorbing members and cannot be subjected to slippage under load. This arrangement greatly increases the life of the clutches. The clutches are hydraulically applied and spring released.
Each clutch has (8) eight friction plates which have sintered bronze facings, and (8) reaction plates of polished steel. Because the clutches are hydraulically controlled, there is automatic compensation for normal wear; no adjustment is necessary.