Reduced Cylinder Mode Operation; No-Injection Cranking - Komatsu PC130-8 Shop Manual

Hydraulic excavator

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Reduced cylinder mode

a Reduced cylinder mode operation means to

run the engine with the fuel injectors of 1 or

more cylinders disabled electrically to reduce

the number of effective cylinders. The pur-

poses and effects of this operation are as fol-

This operation is used to find out a cylinder

which does not output power normally (or,

combustion in it is abnormal).

When a cylinder is selected for the reduced

cylinder mode operation, if the engine speed

and output do not change from the normal

operation (all-cylinder operation), that cylinder

has 1 or more defects.

The possible defects are as follows.

Compression leakage through cylinder

Defective injection

Defective piston, piston ring, or cylinder

Defective valve mechanism (Moving valve

Defect in electrical system

Since the common rail fuel injection system

controls the injector of each cylinder electroni-

cally, the operator can perform the reduced cyl-

inder mode operation easily with switches to

find out a defective cylinder.

a No-injection cranking means to crank the

engine with the starting motor while all the

injections are stopped electrically. The pur-

pose and effect of this operation are as follows.

Before the engine is started after it or the

engine unit has been stored for a long period,

the no-injection cranking is performed to lubri-

cate the engine parts and protect them from

30 Testing and adjusting

Troubleshooting