TM 5-3805-290-23-1
THEORY OF OPERATION - CONTINUED
0003 00
TRANSMISSION - CONTINUED
d.
Modulating control valves direct oil from transmission hydraulic pump to speed and direction clutches in transmis-
sion. Transmission has six clutches that are engaged hydraulically. Clutches are released by spring force. Axles are
equipped with hydraulically engaged inboard brakes.
e.
Switches in transmission direction and shift lever inform machine ECM of direction and selected by operator.
ECM energizes modulating control valve solenoids to engage correct clutches for selected speed and direction.
f.
Machine ECM communicates with engine ECM through CAN data link. Machine ECM also communicates with
monitoring system control and data link connector through CAT data link. Machine ECM can communicate with a
personal computer through diagnostic connector. Machine ECM transmits information to dash panel cluster.
Engine ECM also transmits information to dash panel cluster. Backup alarm is activated by ECM whenever trans-
mission is shifted to REVERSE.
g.
Machine ECM uses information from transmission neutralizer override switch, brake pressure sensor, and parking
brake switch in order to provide proper output to modulating control valves and dash panel cluster. Intermediate
speed sensors, transmission oil temperature sensor, torque converter output speed sensor, and output speed sensors
also provide input to ECM in order to provide proper output to modulating control valves.
427-B1636
0003 00-32
