Komatsu Galeo PC138US-8 Shop Manual page 723

Hydraulic excavator

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Table of Contents

HYDRAULIC EXCAVATOR

Machine model

40 Troubleshooting

Troubleshooting of hydraulic and

mechanical system (H-mode)

Information contained in troubleshooting table ............................................................................................... 3

System chart for hydraulic and mechanical systems ...................................................................................... 4

H-1 Speed or power of all work equipment, swing, and travel are low ........................................................... 6

H-2 Engine speed sharply drops or engine stalls............................................................................................ 7

H-3 No work equipment, travel and swing move ............................................................................................ 8

H-4 Abnormal noise is heard from around hydraulic pump............................................................................. 8

H-5 Fine control mode does not function ........................................................................................................ 9

H-6 Speed or power of boom is low .............................................................................................................. 10

H-7 Speed or power of arm is low..................................................................................................................11

H-8 Speed or power of bucket is low ............................................................................................................ 12

H-9 Work equipment does not move in its single operation.......................................................................... 13

H-10 Hydraulic drift of work equipment is large ............................................................................................ 14

H-11 Time lag of work equipment is large..................................................................................................... 15

H-12 Work equipment loaded more is slower during compound operation .................................................. 15

PC138US, USLC-8

1SHOP MANUAL

Serial number

20001 and up

Troubleshooting

Galeo pc138uslc-8