Performing The Brake Tests - Komatsu 930E-4SE Operation & Maintenance Manual

Operating Instructions - Section 30
Page 30-8

PERFORMING THE BRAKE TESTS

Setup
Before performing any brake test, the following con-
ditions must be met:
• Dump body empty
NOTE: The drive system will not enter any brake test
if the truck is loaded.
• Truck located outside on a flat area, where truck
movement is allowed.
Ensure the area around the truck is free of per-
sonnel and objects. Some truck movement could
occur during brake testing.
The drive system is unable to determine if the
truck is on a hill or in a parking ditch. Testing
during these conditions will affect test results.
Before performing any brake test, the truck must be
in the following state:
• Engine on (low idle)
• Drive system ready (Ready Mode)
• Dump body down
• No drive system warning lights ON
(Can not be in LIMP mode.)
• Zero ground speed
Service Brake Test
1. Firmly depress the service brake pedal.
2. Place the directional control lever in the NEU-
TRAL position. Ensure the wheel brake lock
switch is OFF.
3. Press the brake test switch and wait for the
brake check light to be on solid.
4. Fully depress the service brake pedal. Ensure
full brake application is reached. Failure to
reach full brake application will affect the ser-
vice brake test results.
5. The DID panel will display:
Service Brake Test READY
Press Accel Pedal to Start
6. With the service brake pedal still fully applied,
fully depress the accelerator pedal. The drive
system controller will enter propel mode and
generate torque up to the service brake limit.
Maintain full service brake pressure during the
test.
NOTE: The drive system can only detect if the
service brakes are applied. It can not detect the
percentage of application. It is up to the operator to
press hard enough on the service brake pedal to
achieve a full brake application.
7. The DID panel will display:
Service Brake Test ACTIVE
Check Truck Movement when Light Flashes
8. Once torque has reached the limit for the ser-
vice brake test, the brake check light will begin
to flash. This is the indication for the operator to
make a determination as to the status of the
service brake system.
• If the truck did not move:
The service brake system passed the test.
• If the truck moved during the test:
The service brake system failed the test.
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