Handling Controller High-Voltage Circuit; Replacing Alternator Belt - Komatsu 114E-3 Series Shop Manual

30 Testing and adjusting
Handling controller high-voltage
circuit
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The engine controller uses a high-voltage
circuit to drive the fuel injector.
Accordingly, the high-voltage circuit is con-
nected to the wiring harnesses and connec-
tors between the engine controller and
injector.
a Normally, the engine controller keeps output-
ting the high voltage to the injector only while
the engine is running and stops outputting
when the engine stops.
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If you touch the high-voltage circuit
directly, you may get an electric shock. To
avoid this, observe the following precau-
tions when testing.
1. The following connectors are used in the high-
voltage circuit.
Engine controller connector: J1
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Injector intermediate connector:
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INJ CYL 1&2, INJ CYL 3&4,
INJ CYL 5&6
Injector head terminal (in head cover)
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2. When disconnecting or connecting a connector
related to the high-voltage circuit, be sure to
turn the starting switch OFF.
3. If a T-adapter is inserted in or connected to a
connector related to the high-voltage circuit for
troubleshooting, do not start the engine.
a You may turn the starting switch to the
OFF or ON position but must not turn it to
the START position.
114E-3 Series

Replacing alternator belt

1
a The auto-tensioner is provided for the alterna-
tor belt. Thus, testing and adjustment of the
belt is usually no necessary.
a Disconnect air conditioner compressor belt
before replacing the alternator belt.
1. Insert a wrench to the portion (A) (width across
flats T 12.7 mm) of the tensioner assembly (2),
and rotate it to the opposite to the winding-up
direction to decrease the alternator belt (1) ten-
sion.
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Make sure that the wrench is secured
at the portion (A) before rotating it.
(The spring of the tensioner assembly
(2) is strong. If the wrench is loosely
inserted, the wrench may accidentally
come off while being rotated and it is
extremely dangerous.)
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After removing the alternator belt (1),
return th e tensioner assembly (2)
slowly with care.
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Be careful not to get your fingers
caught between the pulley and alterna-
tor belt (1) during work.
2. Replace the alternator belt (1).
Check each pulley for breakage and crack.
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SEN00455-01
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