5-7. Cleaning, Inspection and Repair
5-8. Reassembly and Installation
a. Clean all parts with an approved cleaning
Reassemble and install the control rod assembly as
solvent.
b. Inspect all parts for excessive wear, bends,
illustrated on figure 5-4.
breaks and other damage.
Replace or repair all
defective parts as necessary.
Section IV. CARRIER TRANSMISSION ASSEMBLY
selection made on the shift selector control valve
5-9. General
assembly mounted in the operator's cab. In addition to
making shift and range changes as mentioned, the valve
a. The transmission and torque converter
assembly mounted on the transmission also includes the
function together and operate through a common
torque converter pressure regulator valve. Oil, under
hydraulic system. To obtain maximum serviceability,
pressure, is tapped from the clutch port in the
they have been designed and built as separate units.
transmission control valve assembly to supply the shift
b. With the engine running, the converter
selector control valve assembly located in the operator's
charging pump draws oil from the transmission sump
cab.
A small accumulator and check valve are
and directs it through oil filters to the regulating valve
incorporated in the shift selector control valve housing.
located in the transmission control cover. From the
The accumulator assures a pressurized oil supply to the
regulating valve it is then directed through the control on
selector valve. Pressure range is 180 to 220 psi. The
the transmission to the converter and to the transmission
shift selector tower is equipped with a hydraulic shift
clutches.
locknut device that is actuated when the axle oscillate
c. The pressure regulating valve located in the
lock-out is engaged. The shift selector must be in
transmission control conver remains closed until required
neutral before the axle oscillate device will activate.
pressure is delivered to the transmission for actuating
Also, the axle oscillate lock-out must be returned to
the direction and speed clutches. A safety valve is built
release the shift selector lock.
in the transmission control cover and will open to bypass
e. The transmission gear train consists of six
oil only if an excessive pressure is built up due to
shafts:
blocked passage.
(1) Input shaft
d. Transmission Control Lever.
(2) Reverse shaft
(1) Model 2380. On the model, with the
(3) Idler shaft
engine running and the directional control lever in the
(4) First and third shaft
netural position, oil pressure from the converter pump is
(5) Second and fourth shaft
blocked at the control valve, and the transmission is in
(6) Output shaft
netural. Movement of the forward and reverse spool will
f.
The axle de-clutching unit consists of a split
direct oil, under pressure, to either the forward or reverse
output shaft with a sliding splined sleeve to engage or
direction clutch as desired, and the opposite one is open
disengage the axle. This is accomplished by shifting a
to relieve pressure.
lever in the operator's compartment.
(2) Model 2385. The transmission shift and
range control on the model 2385 differs from the model
5-10. Transmission Assembly
2380 in several ways. Shift (forward and reverse) and
range (speed) control is accomplished hydraulically,
a.
Removal.
rather than mechanically, as on the model 2380. The
(1) Remove propeller shafts (para 5-4).
transmission is controlled by separate valve assemblies.
(2) Remove transmission assemblies as
Connected by hydraulic hoses. The transmission control
instructed on figure 5-5.
valve assembly, mounted on the transmission, directs oil
to the speed and directional clutches in response to the
5-12
