Operating Instructions - Section 30 8/11 OM3062
Page 30-6
AFTER ENGINE START-UP
Do not leave the truck unattended while the
engine is running. Move the directional control
lever to PARK and turn off the engine before
leaving the truck.
Become thoroughly familiar with the steering, braking
and emergency controls.
1. After the engine has been started and the low
pressure warning systems are normal, test the
steering by turning the steering wheel fully to
the left and right.
If the steering system is not operating properly,
turn the engine immediately. Determine the
steering system problem and have it repaired
before resuming operation.
2. Operate each of the truck's brake circuits at
least twice before operating and moving the
truck. These circuits include the service brake,
parking brake, and brake lock. With the engine
running and the hydraulic circuit fully charged,
activate each circuit individually from the
operator's cab.
If any application or release of any brake circuit
appears sluggish or improper, or if warning
alarms are activated, turn off the engine and
notify maintenance personnel immediately. Do
not operate the truck until the faulty brake circuit
is fully operational.
3. Check the gauges, warning lights, and
instruments before moving the truck to ensure
proper system operation and proper instrument
functioning. Pay special attention to the braking
and steering hydraulic circuit warning lights. If
warning lights come on, turn off the engine
immediately and determine the cause.
4. Make sure that the headlights, worklights, and
taillights are in proper working order. Check the
operation of windshield wiper. Good visibility
may help prevent an accident.
PRE-SHIFT BRAKE CHECK
(if equipped)
NOTE: Komatsu recommends that operators perform
static brake tests to verify that the braking systems
are adequate at the beginning of each shift before
operating the truck.
The static brake test allows the operator to check the
service brake, parking brake and the dynamic
retarder. The purpose of these tests is to verify the
functionality of the service brake, parking brake and
retarder systems at the time they are tested.
After performing each test, it is the operator’s respon-
sibility to determine if the truck passed each test and
if the truck is safe for operation.
The order of performing the brake tests, (service
brake, parking brake or retard system) does not mat-
ter. Each brake test is a separate test, where one
brake system or all three can be tested at any time.
If an operator has questions during brake testing,
refer to the drive system Diagnostic Information Dis-
play (DID) panel, located on the back wall of the cab
for guidance.
If the truck fails any brake test, notify mainte-
nance personnel immediately. Do not resume
operation unless the truck passes all brake tests.
Events
The following events have been added to the drive
system software to support the brake test feature.
• 645-1 Service Brake test Performed
• 645-2 Parking Brake Test Performed
• 645-3 Retard Test Performed
• 645-4 Brake Test Switch stuck closed
The Events Log will record when and which brake
tests have been performed.
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