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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 if 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
NO. Safety critical parts for periodic replacement Q'ty Replacement interval
1 Fuel tank - hand priming pump 1
Every 2 years or 4000
hours, whichever comes
sooner
2 Engine overflow nipple - joint (bottom of fuel tank) 1
3 Engine overflow nipple - joint (bottom of fuel tank) 1
4 joint (bottom of fuel tank) - fuel tank (overflow) 1
5 joint (bottom of fuel tank) - fuel tank (spill) 1
6 Hand priming pump - supply pump 1
7 Power train pump - Power train filter 1
8 Steering case cover - HSS motor gear train 1
9 Power train filter - transmission control valve 1
10 Transmission control valve - brake valve 1
11 Torque converter - oil cooler 1
12 Oil cooler -
transmission case,
torque converter case
1
13
Central pressure detection
hose
-
transmission case,
torque converter case
1
14 Hydraulic tank - charge pump 1
15 Charge pump - charge filter 1
16 HSS, PPC charge valve - accumulator 1
17 HSS, PPC charge valve - hydraulic tank 1
18 HSS, PPC charge valve - PPC lock valve 1
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