TM-9-2520-215-34
CROSS-DRIVE TRANSMISSION ASSEMBLY
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 2005
TM-9-2520-215-34 - Page 21 of 508
TM 9--2520--215--34
EQUIPMENT DESCRIPTION AND DATA
0002 00
THIS WORK PACKAGE COVERS:
Equipment Description and Data
EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES
The XT--1410--4 transmission is the X--type. This means that the drive is delivered to left and right outputs. The
transmission includes a torque converter with automatic lockup clutch, three forward and one reverse range gear and
clutch groups, a cross shaft and bevel drive gears, two steer clutches and planetary gear sets, steer drive gearing and
two output reduction gear assemblies with brakes. Three forward speeds and one reverse speed are selected
manually.
HYDRAULIC SYSTEM
The hydraulic system, because of its importance to the operation of the transmission, should be studied carefully and
understood. There are eight hydraulic system schematic illustrations which show the various oil circuits and positions
of valves and other moving components in WP 0005 00.
These schematic diagrams parallel the torque path schematic views in WP 0005 00. The hydraulic schematic views
illustrate what happens hydraulically, while the torque schematic diagrams illustrate what happens mechanically.
The complete hydraulic system is shown in WP 0005 00
.
Torque Converter and Lockup Drive. Drive from the vehicle engine to the transmission range gearing is either
hydraulic (torque converter) or mechanical (lockup) clutch engaged. Lockup drive is obtainable only when
transmission is operating in intermediate and high range.
OIL LEVELS
The hydraulic system is designed so that after the vehicle has been operated for a short time, two distinct oil levels
are established in the transmission. One oil level is in the output gear compartment and is comparatively low
(WP 0005 00). The other is in the transmission sump. The purpose of having two oil levels is to provide sufficient
volume of oil in reserve while maintaining the most efficient level of oil in the operating section of the transmission.
Two levels exist because air, as well as oil, is constantly being delivered to the output gear compartment of the
transmission. This creates a constant air pressure which acts upon the oil in the output gear compartment. The air
comes from two sources: from the scavenge pump, which pumps a mixture of oil and air from the converter housing,
and from the brake coolant pump, which pumps air during periods when the brakes are released. The air
accumulates above the oil in the gear compartment and forces the oil level down and through a passage in a wall
separating the gear compartment from the oil sump. When the oil reaches its proper level, excess air escapes into
the sump and returns to the scavenge pump.
DIFFERENCES BETWEEN MODELS
This TM covers XT--1410--4 Transmission only.
TRANSMISSION OIL
The use of the proper oil and attention to keeping the oil clean are of major importance. The proper oil level must be
maintained in the transmission to obtain maximum performance. Check the oil level regularly. Clean filters at
specified intervals. Be very careful that no foreign matter enters the transmission at any time. When changing or
adding oil, refer to Oil Specification and Lubrication Order (LO 9--2350--256--12).
END OF WORK PACKAGE
0002 00--1/2 blank
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