Komatsu Galeo PC800-8 Shop Manual page 251

10 Structure, function and maintenance standard
Bkup speed sensor (G sensor)
(Cylinder No. sensor)
• Similarly to the NE speed sensor, this sensor uti-
lizes the pulses of 0 – 5 V generated by the
change of the magnetic line of force crossing the
sensor unit.
• The disc gear installed to the central part of the
camshaft of the high-pressure pump has teeth
(cut parts) around it at intervals of 120°.
• In addition to the above teeth, one more tooth is
installed. Accordingly, 7 pulses are generated
every 2 revolutions of the engine.
• The standard pulse of the No. 1 cylinder is recog-
nized by the combination of the NE speed sensor
pulse and Bkup speed sensor pulse.
PC800, 850-8
Boost pressure sensor
• This sensor is used to sense the boost pressure
(charge pressure).
SEN00386-03
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