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SAFETY CRITICAL PARTS
SAFETY CRITICAL PARTS
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. How-
ever, 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 LIST
No.
Safety critical parts for periodic replacement
1
Fuel tank - block
2
block - fuel pre-filter
3
Fuel pre-filter - supply pump
4
Supply pump - engine controller base
5
Engine controller base - fuel main filter
6
Over flow hose (supply pump - fuel tank)
7
Spill hose (engine controller base - fuel tank)
8
Pump outlet hose (pump - control valve)
9
Work equipment hose (boom cylinder inlet port)
10 Work equipment hose (bucket cylinder line, boom foot)
11 Work equipment hose (bucket cylinder inlet port)
12 Work equipment hose (bucket cylinder inlet port, 4.0 m arm)
13 Work equipment hose (arm cylinder line, boom foot)
14 Work equipment hose (arm cylinder inlet port)
15 Attachment additional line hose (boom foot)
16 Attachment additional line hose (boom intermediate)
17 Attachment additional line hose (boom top)
18 Swing line hose (swing motor inlet port)
19 Main suction hose
20 Gear pump suction hose
21 Heater hose
22 Travel line hose (control valve - swivel joint)
23 Travel line hose (swivel joint - travel motor)
24 Accumulator (for control circuit)
25 High-pressure piping clamp
26 Missing fuel spray prevention cap
27 Seat belt
4-16
MAINTENANCE
Q'ty
Replacement interval
1
1
1
1
1
1
1
2
4
2
2
2
Every 2 years or 4000 hours,
whichever comes sooner
2
2
2
2
2
2
1
1
2
4
4
1
10
Every 8000 hours
12
1
Every 3 years
4
4
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