Cooling Blower Warning System - Komatsu 830E Shop Manual

COOLING BLOWER WARNING SYSTEM

The Komatsu truck is equipped with a cooling blower to
supply cooling air to the alternator, exciters and wheel
motors.
The cooling blower warning system which consists of a
pressure switch, warning light, buzzer, and an adjust-
able time delay controlled by the CPU in the FL275
panel. The time delay can be adjusted by entering the
desired value using the software used to program the
CPU. The default delay time is 101 seconds.
The purpose of the warning system is to alert the oper-
ator in case of blower loss or low blower output. Blower
loss or low blower output could result in component
malfunction due to the lack of cooling air.
Operation
The warning light and buzzer will only come on if the
throttle is depressed while selector is in FORWARD or
REVERSE for a period exceeding 101 seconds and
blower output is less than normal. The 101 second time
cycle is controlled by the FL275 panel CPU.
Test
Check the operation of the blower loss warning system
as follows:
1. With the engine not running, turn the key switch
and control power On and place the selector
switch in FORWARD.
2. Depress the throttle pedal until the propulsion
contactors pull in.
3. After 101 seconds, (or the value entered on the
TRUCK SPECIFICS SCREEN) the Motor Blower
warning light on the instrument panel should turn
on.
If the switch requires adjustment, refer to instructions in
"Miscellaneous Component Test and Adjustment" in
the STATEX III ELECTRICAL SYSTEM CHECKOUT
PROCEDURE in Section E3.
E2-64
FIGURE 2-31. COOLING BLOWER PRESSURE
1. Blower Pressure
Switch
2. Adjustment Access
Cover
Removal
NOTE: If the blower pressure switch cannot be
adjusted to specifications and no air leaks are found, a
new switch assembly must be installed.
1. Inspect rear axle access door cover gasket,
blower duct hose and wheel covers for damage
or possible leaks.
2. Open rear axle access door and locate switch (1,
Figure 2-31).
3. Remove nylon tubing attached to switch.
4. Remove the four capscrews, lockwashers, and
nuts attaching switch assembly to mounting
bracket and remove.
Installation
1. Attach switch assembly (1, Figure 2-31) to
mounting bracket using hardware removed in
above procedure.
2. Install nylon tube
3. Close rear axle access door and calibrate switch
per instructions in "Miscellaneous Component
Test and Adjustment".
Electrical Propulsion Components
SWITCH (Rear Axle)
3. Maintenance Light
2/02 E02016