Komatsu WA250-1, WA250-1LC Wheel Loader Service Manual

Table of Contents

• Contents
• Engine
• Power Train
• Steering System
• Brake and Air System
• Work Equipment
• Electric and Electronic System
• Others

Manual Extract :

PREVENTING RECURRENCE OF TROUBLE
The troubleshooting table is used to establish the direct cause of damage or breakdown of a part or piece of equipment. It is not able to establish the root cause of the damage or failure, however.

Also, this table only describes the action to be taken with the particular part or piece of equipment. It does not mention what action should be taken to prevent a recurrence of the root cause.

In order to remove the root cause of a fault so as to prevent a recurrence, carefully investigate the real cause while referring to the following items.
Regarding the method of checking and adjusting each part or piece of equipment, refer to “Testing and adjusting”
in the Shop Manual.

HYDRAULIC EQUIPMENT
Oil checks
The fundamental cause of almost all faults occurring in hydraulic equipment is the inclusion of water, air or other foreign matter in the oil.
Accordingly, it is necessary to check the oil to see whether or not it contains any of the above substances, and then take appropriate action.

1) Oil checks
Check for water ingress
Check the oil for possible water ingress by means o f a diesel engine oil checker or a hot plate.
Check for ingress of other foreign matter Remove the drain plug and filter, then check the bottom of the tank and also the filter to see if any foreign matter has collected there.
Check the degree of contamination by means of a contamination checker.
• Viscosity check
Check the viscosity of the oil using a viscometer in order to confirm whether or not the oil is satisfactory.