Komatsu ecot3 WA500-6 Shop Manual page 15

00 Index and foreword
Failure code [DXHKKA] (3-spool valve retract EPC solenoid: Disconnection) ........................ 39
Failure code [DXHKKB] (3-spool valve retract EPC solenoid: Short circuit) ........................... 40
Failure code [DXHKKY] (3-spool valve retract EPC solenoid: Short circuit with
power supply line) ............................................................................................................ 41
Failure code [DXHLKA] (Joystick steering right EPC solenoid: Disconnection) ...................... 42
Failure code [DXHLKB] (Joystick steering right EPC solenoid: Short circuit).......................... 44
Failure code [DXHLKY] (Joystick steering right EPC solenoid: Short circuit with
power supply line) ............................................................................................................ 46
Failure code [DXHMKA] (Joystick steering left EPC solenoid: Disconnection) ....................... 48
Failure code [DXHMKB] (Joystick steering left EPC solenoid: Short circuit) ........................... 50
Failure code [DXHMKY] (Joystick steering left EPC solenoid: Short circuit with
power supply line) ............................................................................................................ 52
Troubleshooting of electrical system (E-mode)
Before carrying out troubleshooting of electrical system .........................................................
Information in troubleshooting table ........................................................................................
E-1 Engine does not start ........................................................................................................
E-2 Wiper does not operate..................................................................................................... 12
E-3 Windshield washer does not operate................................................................................ 16
E-4 Headlamp, clearance lamp, tail lamp, and license lamp do not light up or go off ............. 19
E-5 Working lamp does not light up or go off........................................................................... 27
E-6 Turn signal lamp and hazard lamp do not light up or go off .............................................. 32
E-7 Brake lamp does not light or it keeps lighting up .............................................................. 38
E-8 Backup lamp does not light or it keeps lighting up ............................................................ 40
E-9 Backup buzzer does not sound or it keeps sounding ....................................................... 42
E-10 Horn does not sound or it keeps sounding ..................................................................... 44
E-11 Alarm buzzer does not sound or it keeps sounding ........................................................ 47
E-12 Air conditioner does not operate or stop ......................................................................... 49
E-13 KOMTRAX system does not work properly .................................................................... 52
Troubleshooting of hydraulic and mechanical system (H-mode)
Method of using troubleshooting chart ....................................................................................
Table of failure modes and causes ..........................................................................................
H-1 Machine does not start ..................................................................................................... 10
H-2 Torque converter lockup is not switched off (engine stalls)
[Machine with lockup clutch (if equipped)]........................................................................ 12
H-3 Torque converter lockup is not switched ON [Machine with lockup clutch (if equipped)].. 13
H-4 Travel speed is slow, thrusting force is weak, uphill traveling power is weak,
and gear is not shifted ...................................................................................................... 14
H-5 Shocks are large at the times of starting and shifting gear ............................................... 16
H-6 Time lag is large at the times of starting and shifting gear................................................ 18
H-7 Torque converter oil temperature is high .......................................................................... 20
H-8 Steering does not turn....................................................................................................... 21
H-9 Steering does not turn [Machine with joystick steering (if equipped)] ............................... 22
H-10 Steering response is low................................................................................................. 23
H-11 Turning response of steering is poor [machine with joystick steering (if equipped)] ....... 24
H-12 Steering is heavy ............................................................................................................ 25
H-13 When machine turns, it shakes or makes large shocks.................................................. 26
H-14 When machine turns, it shakes or makes large shocks
[machine with joystick steering (if equipped)]................................................................... 27
H-15 Wheel brake does not work or does not work well ......................................................... 28
H-16 Wheel brake is not released or it drags .......................................................................... 29
H-17 Parking brake does not work or does not work well ....................................................... 30
H-18 Parking brake is not released or it drags (including emergency release system)........... 31
H-19 Lift arm does not rise ...................................................................................................... 32
H-20 Lift arm speed is low or rising force of lift arm is insufficient ........................................... 33
H-21 When rising, lift arm comes to move slowly at specific height ........................................ 34
H-22 Lift arm cylinder cannot hold down bucket (Bucket floats).............................................. 34
H-23 Hydraulic drifts of lift arm occur often.............................................................................. 34
H-24 Lift arm wobbles during operation................................................................................... 34
WA500-6
SEN00701-19
SEN00740-02
3
6
7
SEN00741-00
3
6
13