Komatsu SK820-5N Skid-Steer Loader Service Manual

Table of Contents

00 FORWARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00-1
01 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01-1
10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD . . . . . . . . . . . . . . . . . . . . 10-1
20 STANDARD VALUE TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1
30 TESTING AND ADJUSTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-1
40 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40-1
50 DISASSEMBLY AND ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-1
90 DIAGRAMS AND SCHEMATICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90-1

This shop manual is an aid to improve the quality of repairs by giving the operator an accurate
understanding of the product and by showing him the correct way to perform repairs and make judgements. 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.

The manual is divided into chapters on each main group of components; these chapters are further divided into the
following sections.

GENERAL
This section lists the general machine dimensions, performance specifications, component weights, and fuel, coolant and
lubricant specification charts.

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
This section explains the structure and function of each component. It serves not only to give an understanding of the
structure, but also serves as reference material for troubleshooting. In addition, this section gives the judgement standards
when inspecting disassembled parts.

STANDARD VALUE TABLE
This section explains the standard values for new machine and judgement criteria for testing, adjusting and
troubleshooting. This standard value table is used to check the standard values in testing and adjusting and to judge parts
in troubleshooting.

TESTING AND ADJUSTING
This section explains checks to be made before and after performing repairs, as well as adjustments to be made at
completion of the checks and repairs.

TROUBLESHOOTING
Troubleshooting charts correlating Problems to Causes are also included in this section.

DISASSEMBLY AND ASSEMBLY
This section explains the order to be followed when removing, installing, disassembling or assembling each component,
as well as precautions to be taken for these operations.

DIAGRAMS AND SCHEMATICS
This section has the foldout drawings for the machine.

Check before troubleshooting.
A. Check the oil level.
B. Check for any external leakage of oil from the piping or hydraulic equipment.
C. Check the travel of the control levers.
D. Check the stroke of the control valve spool.
E. Other maintenance items can be checked externally, so check any item that is considered to be necessary.

4. Confirming the failure.
A. Confirm the extent of the failure yourself, and judge whether to handle it as a real failure or as a problem with the method of operation, etc.
– When operating the machine to reenact the troubleshooting symptoms, do not carry out any investigation or measurement that may make the problem worse.