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00 Index and foreword
Index
E-52 Backup lamp does not light up or does not go out........................................................ 40-867
E-53 Backup buzzer does not sound or continues to sound ................................................. 40-870
E-54 Front wiper does not operate ..................................................................................... 40-872
E-55 Rear wiper does not operate ..................................................................................... 40-875
E-56 Window washer does not operate .............................................................................. 40-877
E-57 KOMTRAX system does not operate normally ............................................................ 40-880
Troubleshooting of hydraulic and mechanical system (H-mode) .................................................. 40-882
Information described in troubleshooting table (H-mode) ..................................................... 40-882
System chart of hydraulic and mechanical systems............................................................. 40-883
Failure mode and cause table ........................................................................................... 40-885
H-1 Machine does not travel forward or backward ............................................................... 40-891
H-2 Machine does not travel forward (Machine travels backward normally) ........................... 40-894
H-3 Machine does not travel backward (Machine travels forward normally) ........................... 40-895
H-4 Machine does not travel forward or backward fast......................................................... 40-896
H-5 Machine does not travel forward fast (Machine travel backward fast) .............................. 40-900
H-6 Machine does not travel backward fast (Machine travel forward fast) .............................. 40-901
H-7 Machine lacks power neither when traveling forward nor backward ................................ 40-902
H-8 Machine lacks power when traveling forward (Machine has sufficient power when traveling
backward) .......................................................................................................... 40-905
H-9 Machine lacks power when traveling backward (Machine have sufficient power when
traveling forward) ................................................................................................ 40-906
H-10 Engine stalls during travel or engine speed drops significantly ..................................... 40-907
H-11 Steering wheel is too heavy to turn............................................................................. 40-908
H-12 Steering wheel is heavy to turn.................................................................................. 40-910
H-13 Machine sways or large shocks are made while machine turns .................................... 40-911
H-14 Machine unintentionally turns when machine travels ................................................... 40-912
H-15 Wheel brakes do not work or are weak....................................................................... 40-913
H-16 Wheel brakes are not released or drag....................................................................... 40-914
H-17 Parking brake does not work or it is weak ................................................................... 40-915
H-18 Parking brake is not released or drags. ...................................................................... 40-916
H-19 Boom does not rise .................................................................................................. 40-917
H-20 Boom moves slow or boom lacks lifting force .............................................................. 40-919
H-21 Rising boom slows down at certain height .................................................................. 40-921
H-22 Lift cylinders do not serve to hold bucket (bucket rises off ground) ................................ 40-922
H-23 Hydraulic drift of boom is large .................................................................................. 40-923
H-24 Boom moves up and down during operation ............................................................... 40-924
H-25 Bucket does not tilt back ........................................................................................... 40-925
H-26 Bucket moves slow or lacks tilt force .......................................................................... 40-927
H-27 Bucket decelerates during tilt-back operation.............................................................. 40-929
H-28 Bucket cylinder does not hold bucket on ground ......................................................... 40-930
H-29 Hydraulic drift of bucket is large ................................................................................. 40-931
H-30 Bucket tilts back and forth during carrying load ........................................................... 40-932
H-31 Boom and bucket control levers do not move smoothly and are heavy to move ............. 40-933
H-32 Operating work equipment causes engine speed to lower significantly or engine to
stall ................................................................................................................... 40-934
H-33 Large shocks are made when work equipment starts to move and stops ....................... 40-935
H-34 When certain work equipment is relieved hydraulically, other work equipment
moves ............................................................................................................... 40-936
H-35 E.C.S.S. (travel damper) does not work and machine pitches and bounces................... 40-937
H-36 Fan speed is abnormal (too high or low, or fan does not rotate) .................................... 40-938
H-37 Unusual noise is heard from around fan ..................................................................... 40-940
Troubleshooting of engine (S-mode)......................................................................................... 40-941
Information described in troubleshooting table (S mode)...................................................... 40-941
S-1 Engine does not crank when starting switch is turned to START position......................... 40-942
S-2 Engine cranks but no exhaust smoke comes out........................................................... 40-943
S-3 Fuel is being injected but engine does not start (misfiring: engine cranks but does not
start).................................................................................................................. 40-944
S-4 Engine startability is poor ............................................................................................ 40-945
S-5 Engine does not pick up smoothly ............................................................................... 40-947
00-12
WA320-7
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