THEORY OF OPERATION - CONTINUED
POWERTRAIN - CONTINUED
Ride Control Function.
Ride control is enabled by a programmable parameter via Electronic Technician (ET). Ride control is enabled
when operator places ride control switch in ON or AUTO position (TM 5-3805-291-10). In ON position, ride con-
trol is activated at all times and powertrain ECM continuously energizes ride control solenoid. This mode should
only be used when machine is being serviced. Never operate machine with ride control switch in ON position. In
AUTO position, ride control is activated when machine ground speed increases above approximately 6 mph (10
kph). In AUTO position, ride control is deactivated when machine ground speed is below approximately 5.5 mph
(8.9 kph). Default speed can be changed in ET configuration screen.
Three ride control solenoids are powertrain ECM outputs which turn ride control system ON and OFF. When ride
control is disabled, number one and number three ride control solenoids are de-energized and number two ride
control solenoid is energized. When ride control is enabled, number one and number three ride control solenoids
are energized one second after number two ride control solenoid is de-energized. Delay time can be changed in ET
All ride control solenoids have a connector with two contacts. Number one ride control solenoid receives power
from powertrain ECM connector contact J2-5. Number two ride control solenoid receives power from powertrain
ECM connector contact J2-6. Number three ride control solenoid receives power from powertrain ECM connector
contact J2-3. All ride control solenoids return power to powertrain ECM connector contact J2-4.
N OT E
Speed limiter software will not prevent a machine from exceeding the speed limit during downhill
travel because weight of machine pushes machine.
Use same gear (or lower) to go down a grade that would be used to go up same grade.
Speed Limiter. Speed limiter software allows an operator to limit maximum ground speed for a machine operating on a
level surface. Speed limiter software uses these inputs to control machine ground speed: engine speed, machine acceler-
ation, and ground speed.