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TM 9-8000
converter. The transmission offers four forward speeds
25-1.General.  The
and two reverse speeds with fully automatic shifting and
transmission, features a hydraulic torque converter
converter lockup in all modes. All controls to the
combined with a series of planetary gear packages for
transmission are initiated by the driver, Including the
propulsion, a hydrostatic pump and motor unit with
brake system, which is operated by a foot pedal. The
combining planetaries for differential steering control,
transmission provides a hydrostatic steering system and
and Integral power- assisted brakes. Different Input
integral hydraulic brakes.
modules are used with the respective engine to Increase
25-2. Function. The X1100-3B transmission provides
hydraulic drive through a locking torque
b. Neutral. There are no clutches applied in neutral;
25-3. General. There are several models of cross-drive
therefore, torque produced in the converter Is not
transmissions. This discussion will limit itself to the
transmitted beyond the range Input gear and forward
X1100-3B unit; all other models are covered in chapter
clutch housing. Figure 25-4 illustrates the power flow In
24. Figure 25-1 shows an external view of the X1100-3B
the neutral position.
cross-drive transmission, while figure 25-2 illustrates the
main subassemblies In the transmission.
c. First Range. In the first range, the forward and first
clutches are applied. The first clutch application anchors
25-4. Torque Converter. The torque converter used In
the rear planetary ring gear against rotation. The forward
the X1100-3B is a three-element assembly including a
clutch application locks the range Input gear and main
pump, stator, and turbine. The pump assembly Is the
shaft together to rotate as a unit. The rear sun gear Is
Input element and Is driven by the engine. The converter
splined to the main shaft and rotates with it and, In turn,
turbine Is the output element and Is splined to the turbine
rotates the rear planetary pinions. The pinions are part of
shaft assembly. The stator Is the reaction (torque
the carrier assembly that Is splined to the range output
multiplying) element. A lockup clutch is used in the
gear. With the ring gear held stationary by the applied
torque converter. It serves to provide a direct drive from
first clutch and rear sun gear rotating the pinions, the
the engine to the transmission. Both converter phase
rear planetary carrier must rotate within the ring gear and
and lockup phase are Illustrated In figure 25-3. Details of
drive the range output gear. Figure 25-5 illustrates the
torque converter operation are found in paragraph 21-7.
power flow In first range.
25-5. Planetary Gearing In Gear Ranges.
d. Second Range. As the selector is placed in the
second range, the forward and second clutches are
General.  The  range  planetary  pack  consists  of
applied. The second clutch application anchors the
hydraulically applied clutches and planetary gearing
carrier of the front planetary assembly against rotation.
which provide the four forward speeds and two reverse
The forward clutch application locks the range input gear
speeds. The range pack consists of five clutches and
and main shaft together to rotate as a unit. The rear sun
three planetary gear sets. All forward and reverse ranges
gear Is splined to both the rotating main shaft and the
are engaged by applying two clutches at a time In
center ring gear, and all three parts rotate at one input
various combinations. Range shifts are accom- plished
speed. With the carrier of the front planetary assembly
by changing  the  application  of  a  single  clutch.
anchored against rotation (by second-clutch
application), the rotating


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