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Information described in troubleshooting table (H-mode) ..................................................... 40-680
System chart of hydraulic and mechanical systems............................................................. 40-681
Failure mode and cause table ........................................................................................... 40-683
H-1 All of work equipments and travel operations lack speed or power.................................. 40-689
H-2 Engine speed drops significantly or engine stalls .......................................................... 40-692
H-3 None of work equipment or travel works....................................................................... 40-695
H-4 Unusual sound is heard from around hydraulic pump .................................................... 40-696
H-5 Fine control performance or response is poor ............................................................... 40-697
H-6 Boom speed or power is low ....................................................................................... 40-699
H-7 Arm speed or power is low .......................................................................................... 40-703
H-8 Bucket speed or power is low...................................................................................... 40-708
H-9 Work equipment does not move in single operation....................................................... 40-711
H-10 Hydraulic drift of boom is large .................................................................................. 40-712
H-11 Hydraulic drift of arm is large ..................................................................................... 40-713
H-12 Hydraulic drift of bucket is large ................................................................................. 40-714
H-13 Time lag of work equipment is large ........................................................................... 40-715
H-14 When part of work equipment is relieved singly, other parts of work equipment
move ................................................................................................................. 40-717
H-15 One-touch power maximizing function does not operate .............................................. 40-718
H-16 In combined operation of work equipment, equipment having heavier load moves
slower................................................................................................................ 40-719
H-17 Machine does not travel straight ................................................................................ 40-720
H-18 Travel speed is slow ................................................................................................. 40-723
H-19 Machine is hard to steer or travel power is low ............................................................ 40-726
H-20 Travel speed does not change, or travel speed is too slow or fast ................................. 40-730
H-21 One of tracks does not run ........................................................................................ 40-731
H-22 Upper structure does not swing to the right or left ........................................................ 40-733
H-23 Upper structure swings only to the right or left............................................................. 40-734
H-24 Swing acceleration or swing speed is low in both directions (right and left) .................... 40-735
H-25 Swing acceleration performance is poor or swing speed is slow in only one
direction............................................................................................................. 40-736
H-26 Upper structure overruns excessively when it stops swinging (both right and
left).................................................................................................................... 40-737
H-27 Upper structure overruns excessively when it stops swinging (either right or left) ........... 40-738
H-28 Shock is large when upper structure stops swinging.................................................... 40-739
H-29 Large unusual noise is heard when upper structure stops swinging .............................. 40-740
H-30 Swing drift on a slope is large while swing parking brake is applied............................... 40-741
H-31 Swing drift on a slope is large while swing parking brake is released............................. 40-742
H-32 Attachment hydraulic circuit cannot be changed while attachment is installed................ 40-743
H-33 Oil flow in attachment circuit cannot be controlled ....................................................... 40-744
Troubleshooting of engine (S-mode)......................................................................................... 40-745
Information mentioned in troubleshooting table (S mode)..................................................... 40-745
S-1 Engine does not crank when starting switch is turned to START position......................... 40-746
S-2 Engine cranks but no exhaust smoke comes out........................................................... 40-747
S-3 Fuel is being injected but engine does not start (misfiring: engine cranks but does not
start).................................................................................................................. 40-748
S-4 Engine startability is poor ............................................................................................ 40-749
S-5 Engine does not pick up smoothly ............................................................................... 40-751
S-6 Engine stops during operation ..................................................................................... 40-753
S-7 Engine runs rough or is unstable ................................................................................. 40-755
S-8 Engine lacks power .................................................................................................... 40-756
S-9 Exhaust smoke is black .............................................................................................. 40-758
S-10 Engine oil consumption is excessive .......................................................................... 40-760
S-11 Oil becomes contaminated quickly ............................................................................. 40-761
S-12 Fuel consumption is excessive .................................................................................. 40-762
S-13 Oil is in coolant (or coolant spurts or coolant level goes down)...................................... 40-763
S-14 Oil pressure drops .................................................................................................... 40-764
S-15 Fuel mixes into engine oil.......................................................................................... 40-765
S-16 Water mixes into engine oil (milky) ............................................................................. 40-766
HB215LC-2
00 Index and foreword
Index
00-11
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