Komatsu D31EX-21 Shop Service Manual

Komatsu D31EX-21 Shop Service Manual


D31EX-21 50001 and up
D31PX-21 50001 and up
D37EX-21 5001 and up
D37PX-21 5001 and up

• This shop manual may contain attachments and optional equipment that are not available in your area. Please consult your local Komatsu distributor for those items you may require.


Materials and specifications are subject to change without notice.

• D31, D37EX, PX-21 mount the SAA4D102E-2 engine.
For details of the engine, see the 102-2 Series Engine Shop Manual.

00-2 D31/37EX,PX-21


This shop manual has been prepared as an aid to improve the quality of repairs by giving the serviceman an

accurate understanding of the product and by showing him the correct way to perform repairs and make judge-
ments. Make sure you understand the contents of this manual and use it to full effect at every opportunity.

This shop manual mainly contains the necessary technical information for operations performed in a service

workshop. For ease of understanding, the manual is divided into the following chapters; these chapters are fur-
ther divided into each main group of components.


Komatsu D31EX-21 Shop Service Manual



This section explains the structure and function of each component. It serves not only to give an under-
standing of the structure, but also serves as reference material for troubleshooting.

In addition, this section may contain hydraulic circuit diagrams, electric circuit diagrams, and maintenance standards.


This section explains checks to be made before and after performing repairs, as well as adjustments to
be made at the completion of the checks and repairs.
Troubleshooting charts correlating “Problems” with “Causes” are also included in this section.


This section explains the procedures for removing, installing, disassembling and assembling each com-
ponent, as well as precautions for them.


This section gives the judgment standards for the inspection of disassembled parts.
The contents of this section may be described in STRUCTURE AND FUNCTION.


This section mainly gives hydraulic circuit diagrams and electric circuit diagrams.
In addition, this section may give the specifications of attachments and options together.


Komatsu D31EX-21 Shop Service Manual
Komatsu D31EX-21 Shop Service Manual
Free shipping by email
Price: $29.99


Komatsu D31EX-21 Shop Service Manual