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MAINTENANCE
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
For using the machine safely for an extended period of time, you are required to periodically replace the safety
(critical 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 important 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 periodic
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
Replace wear parts such as the filter element or air cleaner element at the time of periodic maintenance or before
they reach the wear limit. The wear parts should be replaced correctly in order to ensure more economic use of the
machine. When replacing parts, always use Komatsu genuine parts.
As a result of our continuous efforts to improve product quality, the part number may change, so inform your
Komatsu distributor of the machine serial number and check for the latest part number when ordering parts.
NO. Safety critical parts for periodic replacement Q'ty Replacement frequency
1 Fuel hose between fuel tank and fuel strainer 2
Every 2 years or 4000
hours, whichever comes
sooner
2 Fuel hose between fuel strainer and pre-fuel filter 2
3 Fuel hose between pre-fuel filter and feed pump 1
4 Fuel return hose between common rail relay block and relay elbow 1
5 Fuel return hose between relay elbow and fuel tank 1
6 Fuel return hose between supply pump and fuel tank 1
7 Hose between Torque converter oil cooler - power train assembly 1
8 Hose between power train pump - power train filter 1
9 Hose between power train filter - power train assembly 1
10 Hose between transmission case - steering case 1
11 Inspection hose assembly for power train pressure 1
12 Hose between HSS motor - main control valve 2
13 Hose between HSS pump - central drain block 1
14 Hose between HSS motor - central drain block 1
15 Hose between drain relay block (power train) - hydraulic tank 1
16 Hose between oil cooler - central drain block 2
17 Hose between Fan pump - self-reducing pressure valve 1
18 Hose between self-reducing pressure valve - fan motor 3
19 Hose between PCC divider block - main control valve 2
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