Front Axle; Atc Switch; Atc Indicator Light - Monaco DIPLOMAT 2004 Owner's Manual

DIPLOMAT 2004
080331

FRONT AXLE

- Steering System
10 • 380

ATC Switch:

Activating the ATC switch reduces ECU control over engine torque.
Momentarily pressing the ATC switch allows the ECU to increase the
amount of engine torque applied to the drive wheel in an ATC event. The
amount of engine torque applied to the drive wheel will vary with the
amount of drive wheel slip versus road speed. In an ATC event, the ECU
remains active regardless of road speed or switch position. The indicator
light flashes slowly when the ATC switch is activated.

ATC Indicator Light:

During normal operation, the ATC indicator light will illuminate steady
when the ignition key is turned ON. The light remains illuminated until the
first brake application. If an ATC event occurs, the indicator light will flash
quickly. The indicator light will flash slowly if the ATC switch is activated.
CAUTION: Normally the switch should remain inactive. During
an ATC event (drive wheel slip) the ECU will automatically
optimize drive wheel traction in most situations. Activating the
switch during periods of wheel slip can increase torque to the
spinning drive wheel. Drive train damage can occur if the spinning
drive wheel should suddenly regain traction. If the motorhome is
stuck it is advised to call a professional towing company to limit
the possibility of body and drive train damage.
The motorhome is equipped with power steering. Power steering uses
hydraulic pressure to assist rotating the output shaft of the steering gear.
Located at the end of the input shaft of the steering gear is poppet valve and
worm drive. The poppet valve directs the hydraulic fluid pressure to a type
of spool. The worm drive threads into the center of the spool. When in the
center position, pressurized hydraulic fluid bypasses the spool. When a turn
is made, the poppet valve shifts to one direction or the other, directing the
hydraulic pressure to one side of the spool depending on turning direction.
The hydraulic fluid is then cooled before returning to the reservoir.
INSPECT: For signs of leakage when performing fluid level
checks.
When the operator turns the steering wheel the steering shaft causes
hydraulic power from the pump to move the sector shaft of the steering gear.
This movement of the sector shaft is then transferred to the front axle and tires
through the steering linkages.
CHASSIS INFORMATION