Komatsu PC130-8 Excavator Fuel Injector Assembly Removal & Installation

This instruction show you guide on how to remove and install fuel injector assembly for Komatsu PC130-8 excavator.For more Komatsu case,please refer to:Komatsu trouble repair.


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Disconnect the cable from the negative (–) terminal of the battery.

Open fuel drain valve (1) and drain the fuel.
Open the fuel tank cap in advance.Fuel tank: 247


Open and lock engine hood (2)


Removal of the high-pressure pipe
The following indicates the removal of injector assembly of cylinder No. 1 for example.
Remove clamp (3) from the high-pressure pipe.
Remove boot (4) from the injector and common rail sides


Remove injector wiring connector (5).
Connector No.
Cylinder No. 1: CN1
Cylinder No. 2: CN2
Cylinder No. 3: CN3
Cylinder No. 4: CN4
Remove pin (6) and disconnect spill hose (7).
5) Loosen sleeve nut (8) both on the injector side and common rail side and remove high-pressure pipe (9).


Removal of injector assembly

Remove holder mounting bolt (10) and remove holder (11). [*3]

Remove injector assembly (12)




Carry out the installation in the reverse order of removal.

Set the boot slit facing outward and downward.

The boot is designed with fire safety to prevent fuel from splashing onto the hot engine if fuel leaks.

Never bend a high-pressure pipe for the convenience sake.

The clamp used for fixing a high-pressure pipe must be a genuine Komatsu part and it must be tightened to the specified torque.

Be sure to install the boot to the sleeve nut after installing the high-pressure hose.

Before Installing a high-pressure pipe, confirm the following points. If any abnormality was found, replace it with new one. Otherwise,leakage of fuel can result.

No visible striations (b) or patchy dents (c) in the taper seal portion of the connection ( (a) portion: area 2mm inside the tip).

No deformation in portion (d) (at the end of the taper seal portion: 2 mm inside the tip)


When reusing injector, always replace Oring (13) and gasket (14) with new ones.


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