PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS MAINTENANCE
4-16
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS 4
For using the machine safely for an extended period of time, you must periodically replace the safety critical and
fire prevention-related parts listed in the table of important parts.
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 carry out the following checks with hydraulic hoses which need not be replaced periodically. Tighten a loos-
ened clamp or replace a defective hose, as required.
When replacing the hoses, always replace the O-rings, gaskets, and other such parts at the same time.
Ask your Komatsu distributor to replace the critical parts.
No. Safety critical parts for periodic replacement Q'ty
Replacement inter-
val
1 Fuel hose (fuel tank - water separator) 1
Every 2 years or
every 4000 hours,
whichever
comes first
2 Fuel hose (water separator - pump) 1
3 Fuel return hose (pump - fuel tank) 1
4 Fuel spill hose (tube - fuel tank) 1
5 Turbocharger lubricating hose 1
6 Steering hose (pump - priority valve) 1
7 Steering hose (priority valve - orbitrol valve) 1
8 Steering hose (orbitrol valve - steering cylinder) 6
9 Steering hose (steering cylinder line - cushion valve) 2
10 Packings, seals, O-rings of steering cylinder 2
11 Brake hose (gear pump - master cylinder) 1
12 Brake hose (master cylinder - front brake) 2
13 Brake hose (master cylinder - rear brake) 2
14 Brake hose (master cylinder - accumulator) 2
15 Brake hose (accumulator - charge valve) 2
16 Brake hose (master cylinder - hydraulic tank) 1
17 Brake hose (charge valve - hydraulic tank) 1
18 O-rings and oil seals of brake valve 7
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