Komatsu PC138US-8 PC138USLC-8 HYDRAULIC EXCAVATOR Service Manual
Composition of shop manual 1
The contents of this shop manual are shown together with Form No. in a list.
Note 1: Always keep the latest version of this manual in accordance with this list and utilize accordingly.
The marks shown to the right of Form No. denote the following:
Q: New issue (to be filed additionally) q: Revision (to be replaced for each Form No.)
Note 2: This Komatsu shop manual can be supplied for each Form No.
Note 3: To file this shop manual in the special binder for management, handle it as follows:
Place a divider on the top of each section in the file after matching the Tub No. with No. indicated
next to each Section Name shown in the table below:
File overview and other materials in sections in the order shown below and utilize them accordingly.
Komatsu PC138US-8 PC138USLC-8 HYDRAULIC EXCAVATOR Service Manual
Table of contents 1
00 Index and foreword
Index SEN01977-02
Composition of shop manual…….. 2
Table of contents……… 4
Foreword and general information SEN01978-01
Safety notice…. 2
How to read the shop manual …… 7
Explanation of terms for maintenance standard….. 9
Handling of electric equipment and hydraulic component…. 11
Handling of connectors newly used for engines….. 20
How to read electric wire code ….. 23
Precautions when carrying out operation…………… 26
Method of disassembling and connecting push-pull type coupler…. 29
Standard tightening torque table .. 32
Conversion table……… 36
01 Specification
Specification and technical data SEN01979-01
Specification dimension drawings 2
Working range diagram…. 3
Specifications…. 4
List of weights.. 10
Table of fuel, coolant and lubricants…… 14
10 Structure, function and maintenance standard
Engine and cooling system SEN02545-01
Engine mount…. 2
PTO…. 3
Cooling system 4
Power train SEN02546-01
Power train…….. 2
Swing circle……. 3
Swing machinery…. 4
Undercarriage and frame SEN02547-01
Track frame……. 2
Idler cushion…. 4
Idler….. 6
Track roller……. 7
Carrier roller…… 8
Sprocket………… 9
Track shoe……. 10
Hydraulic system, Part 1 SEN02548-01
Hydraulic equipment layout drawing….. 2
Valve control…. 4
Hydraulic tank and filter…. 6
Hydraulic pump. 8
Hydraulic system, Part 2 SEN02549-02
Control valve….. 2
CLSS…………… 14
Functions and operation by valve. 18
Hydraulic system, Part 3 SEN02550-01
PPC valve…….. 2
Komatsu PC138US-8 PC138USLC-8 HYDRAULIC EXCAVATOR Service Manual