Section II. LOCATION AND DESCRIPTION OF MAJOR TRANSMISSION ASSEMBLIES
IMajor Assemblies of the Transmission
1-10. MAJOR ASSEMBLIES OF THE TRANSMISSION
Transmission Top Cover Assembly. Covers the control valve assemblies. Contains push-start
control rod and houses the vacuum modulator.
Control Valve Assemblies. Include the valves, springs, and other components which control the
selection of ranges and automatic shifting of gears The control valve assemblies are mounted
on the separator plate and oil transfer plate assembly at the top of the transmission center
Separator Plate, Oil Transfer Plate Assembly.
Channel oil between control valve assemblies
and transmission center housing.
Left End Cover Assembly. Covers range gears, range pack, and hydrostatic gears. Contains oil
filter and filter cover, output shaft, and coupling that transfers power to final drive.
Right End Cover Assembly. Covers left brake assembly, governor body, equalizer valve, steer
shaft and gears, range output gears, and hydrostatic drive gear.
Contains right brake assembly,
steer gears, brake apply shafts for left and right brakes, brake apply valve, brake coolant valve,
right brake adjust access cover, and output coupling that transfers power to final drive.
Torque Converter Components. The torque converter consists of three elements: pump
assembly, stator assembly, and turbine assembly. The pump assembly is driven by the engine
through the fIywheel.
The turbine assembly is the output element. The stator assembly is the
reaction (torque-multiplying) element.
Input Housinq Assembly. Covers the bevel gear assembly and the hydrostatic pump and motor
steer control assembly. Houses the torque converter components. Contains port for steer shaft
and access port for steering adjustment.
Bevel Gear Assembly. Contains bevel gears for transfer of power to left and right sides in
cross-d rive system.
Houses and drives oil pumps and houses push-start valve.
Hydrostatic Pump and Motor Assembly. Power steering unit. The steer control assembly must
be removed in order to remove the hydrostat from the transmission External gears are
removed when the hydrostat is replaced. Otherwise, the hydrostat is not dealt with at the
Direct and General Support maintenance level.
Center Housinq Assembly. The main part of the transmission. Channels oil to various
assemblies and houses all major transmission assemblies. Contains drilled and tapped bosses on
bottom for mounting transmission to maintenance stand.