TM 5-3805-291-10
DESCRIPTION AND USE OF OPERATOR CONTROLS AND INDICATORS - CONTINUED
0004 00
PARKING BRAKE CONTROL
0004 00
CAU T I ON
Do not engage the parking brake while the machine is moving unless the service brake fails. The use of
the parking brake as a service brake in regular operation will cause severe damage to the parking brake.
Moving machine with the parking brake engaged can cause excessive wear or damage to brake. If
necessary, have brake repaired before operating machine.
Parking brake function activates a warning on Messenger whenever parking brake is engaged. Parking
brake indicator will flash.
1.
Parking Brake Switch. Switch is located to left of steering column. Use parking brake after machine has been stopped.
Toggle switch upward to engage parking brake. Toggle switch downward to disengage parking brake.
a.
When parking brake control is disengaged, transmission will shift normally. When parking brake control is
engaged, transmission will not shift out of NEUTRAL to first speed forward or first speed reverse. If transmission
is in first speed forward or first speed reverse and parking brake is moved to engaged position, transmission will
shift into NEUTRAL. All transmission clutch modulating valves are de-energized. If transmission is in second
speed forward or third speed forward, transmission will remain engaged.
b.
Parking brake function activities a warning on Messenger whenever parking brake is engaged. Parking brake indi-
cator will flash.
c.
When parking brake is engaged and transmission
is in first speed, powertrain ECM shifts transmis-
sion to NEUTRAL and sends parking brake sta-
tus to Messenger via CAT Data Link. When
parking brake is engaged, alert indicator for
parking brake flashes on Messenger. If operator
selects FORWARD or REVERSE and parking
brake is engaged, Messenger causes parking
break indicator and action lamp to flash, and
action alarm to sound.
2.
4-Way Hazard Light Switch. Toggle switch upward
to engage hazard lights. Toggle switch downward to
disengage hazard lights.
427-C0472
WAR N I N G
Personal injury could result from the sudden stop of the machine. The parking brake is automatically
engaged when brake oil pressure drops below an adequate operating pressure.
3.
Alert Indicator. If brakes lose oil pressure, an alert indicator for brakes will flash and an action alarm will sound.
Anticipate a sudden stop. Correct cause of loss of oil pressure. Do not operate machine without normal brake oil pres-
sure. Action light will also flash when lights on monitoring system flash.
