Komatsu 70001 Shop Manual page 11

00 Index and foreword
Troubleshooting of hydraulic and mechanical system (H-mode)
System chart for hydraulic and mechanical system ....................................................................
Information contained in troubleshooting table............................................................................
H-1 All work equipment lack power, or travel and swing speeds are slow..................................
H-2 Engine speed sharply drops or engine stalls........................................................................ 10
H-3 No work equipment, swing or travel move ...........................................................................
H-4 Abnormal noise is heard from around hydraulic pump.........................................................
H-5 Auto-decelerator does not work ........................................................................................... 12
H-6 Fine control mode does not function or responds slow ........................................................ 12
H-7 Boom moves slowly or lacks power ..................................................................................... 13
H-8 Arm moves slowly or lacks power ........................................................................................ 14
H-9 Bucket moves slowly or lacks power.................................................................................... 15
H-10 Work equipment does not move in its single operation ...................................................... 15
H-11 Work equipment has a bit too fast hydraulic drift................................................................ 16
H-12 Work equipment has big time lag ....................................................................................... 18
H-13 Other work equipment moves when relieving single circuit................................................ 18
H-14 Power max. switch does not operate ................................................................................. 18
H-15 Machine push-up function does not operate. ..................................................................... 19
H-16 In compound operation of work equipment, speed of part loaded more is low .................. 20
H-17 When machine swings and raises boom simultaneously, boom rising speed is low .......... 20
H-18 When machine swings and travels simultaneously, travel speed lowers largely................ 20
H-19 Machine deviates during travel........................................................................................... 21
H-20 Travel speed is low............................................................................................................. 22
H-21 Machine is not steered well or steering power is low ......................................................... 23
H-22 Travel speed does not change or travel speed is low or high ............................................ 24
H-23 Travel system does not move (only one side) .................................................................... 25
H-24 Upper structure does not swing.......................................................................................... 26
H-25 Swing acceleration or swing speed is low .......................................................................... 28
H-26 Upper structure overruns remarkably when it stops swinging ............................................ 30
H-27 Large shock is made when upper structure stops swinging ............................................... 31
H-28 Large sound is made when upper structure stops swinging. ............................................. 31
H-29 Hydraulic drift of swing is large........................................................................................... 32
H-30 Attachment circuit is not changed ...................................................................................... 33
H-31 Oil flow in attachment circuit cannot be controlled ............................................................. 33
Troubleshooting of engine (S-mode)
Method of using troubleshooting chart ........................................................................................
S-1 Starting performance is poor ................................................................................................
S-2 Engine does not start............................................................................................................
S-3 Engine does not pick up smoothly........................................................................................ 12
S-4 Engine stops during operations ............................................................................................ 13
S-5 Engine does not rotate smoothly .......................................................................................... 14
S-6 Engine lacks output (or lacks power).................................................................................... 15
S-7 Exhaust smoke is black (incomplete combustion)................................................................ 16
S-8 Oil consumption is excessive (or exhaust smoke is blue) .................................................... 17
S-9 Oil becomes contaminated quickly ....................................................................................... 18
S-10 Fuel consumption is excessive........................................................................................... 19
S-11 Oil is in coolant (or coolant spurts back or coolant level goes down) ................................. 20
S-12 Oil pressure drops .............................................................................................................. 21
S-13 Oil level rises (Entry of coolant or fuel)............................................................................... 22
S-14 Coolant temperature becomes too high (overheating) ....................................................... 24
S-15 Abnormal noise is made ..................................................................................................... 25
S-16 Vibration is excessive ......................................................................................................... 26
50 Disassembly and assembly
General information on disassembly and assembly
How to read this manual .............................................................................................................
Coating materials list...................................................................................................................
Special tool list ............................................................................................................................
PC400, 450-8
SEN02225-15
SEN02652-03
4
6
8
11
11
SEN02653-02
3
6
8
SEN02654-03
2
4
7
9