MAINTENANCE SAFETY CRITICAL PARTS
4-15
SAFETY CRITICAL PARTS 4
For using the machine safely for an extended period if time, you are required to periodically replace the safety (crit-
ical and fire prevention) related parts listed in the table of important parts on the following page.
Material quality of these parts can change as time passes and they are likely to wear out or deteriorate. However,
it is difficult to determine the extent of wear or deterioration at the time of periodic maintenance. Hence, it is
required to replace them with new ones regardless of their condition after a certain period of usage. This is impor-
tant to ensure that these parts maintain their full performance at all times.
Furthermore, should anything abnormal be found on any of these parts, replace it with a new one even if the peri-
odic replacement time for the part has not yet arrived.
If any of the hose clamps show deterioration like deformation or cracking, replace the clamps at the same time as
the hoses.
Also perform the following checks with hydraulic hoses which need to be replaced periodically. Tighten all loose
clamps and replace defective hoses, as required.
When replacing hoses, always replace O-rings, gaskets, and other such parts at the same time.
Have your Komatsu distributor replace the critical parts.
SAFETY CRITICAL PARTS LIST 4
No. Safety critical parts for periodic replacement Q'ty Replacement interval
1 Fuel hose (Fuel tank - Water separator) 1
Every 2 years or 4000
hours, whichever
comes sooner
2 Fuel hose (Water separator - Fuel pump) 1
3 Fuel return hose (Fuel injection pump - Fuel tank) 1
4 Spill hose (Engine output connector - Fuel tank) 1
5 Pump outlet hose (Pump - Control valve) 2
6 Work equipment hose (Boom cylinder inlet) 4
7 Work equipment hose (Bucket cylinder line - Boom foot section) 2
8 Work equipment hose (Bucket cylinder inlet) 2
9 Work equipment hose (Arm cylinder line - Boom foot section) 2
10 Work equipment hose (Arm cylinder inlet) 2
11 Additional attachment line hose (Boom foot section) 2
12 Additional attachment line hose (Boom top section) 2
13 Swing line hose (Swing motor inlet) 2
14 Main suction hose 1
15 Heater hose 2
16 Travel line hose (Control valve - Swivel joint) 4
17 Travel line hose (Swivel joint - Travel motor) 4
18 Seat belt 1 Every 3 years
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