Operation - Komatsu 930E-4SE Operation & Maintenance Manual

OM3062 8/11

OPERATION

The static brake test utilizes a momentary switch and
a check light located in the overhead display panel.
Brake Test Switch
The brake test switch is used to
initiate a brake test. Press on the
momentary switch to enter the
brake test mode. If certain condi-
tions are met, the operator can
enter a brake test sequence.
Brake Check Light
The amber light is used to indi-
cate when the truck is in the
brake test mode. When illumi-
nated, a brake test is ready.
When flashing, the brake test is
at the validation point, or the
retard system test is finished.
Description
The operator can choose which brake test to per-
form, and will set the truck controls based on the set-
tings in Table 1. The drive system will detect the
position of the directional control lever, and will pre-
pare for the appropriate test. The operator will then
press the brake test switch.
If the brake check light is illuminated solid after
pressing the brake test switch, the system is in brake
test mode and is ready for the chosen test to be initi-
ated by the operator. After testing, the operator will
then determine if the truck passed the brake tests,
and if it is safe for operation.
Service Brake
Parking Brake
Retard Test
Table 1: BRAKE TEST SETTINGS
Wheel Brake
Test Type Lock
OFF
OFF
OFF
Operating Instructions - Section 30
If the brake check light does not illuminate immedi-
ately after pressing the brake test switch, there is
most likely a problem with the setup. Refer to the
setup conditions and take action to prepare the truck
for a brake test.
If there is a problem with the truck setup, the DID
panel will display the problem.
For example if the engine is off:
ERROR Entering Brake Test
Engine not running
If the Truck is loaded:
ERROR Entering Brake Test
Truck is NOT Empty
If all of the conditions are correct, except the brakes
are not set correctly, an error message will be dis-
played. For example, if the service brake and parking
brake are both applied together:
ERROR Entering Brake Test
Set Brakes for Test
Brake Test Exit Criteria
Numerous conditions can occur which may interrupt
a brake test, including the following:
• Any of the setup conditions becoming false
• Drive system fault which restricts the LINK or
Propel mode
• Truck Speed greater than 3.2 kph (2.0 mph)
• Drive system at torque level for more than 30
seconds
• Brake test requested, but not initiated by the
operator within 60 seconds after pressing the
brake test switch
Service Brake Directional
Pedal Control Lever
FULLY APPLIED NEUTRAL
RELEASED PARK
RELEASED PARK
Page 30-7