EXCAVATOR DIAGNOSTICS PROGRAM--
MONITOR DATA ITEMS
NOTE: This chart lists engine and pump controller dynamic data items that can be monitored by the excavator
330LCR MONITOR DATA ITEMS
Front pump control pressure
Pilot signal from the front pump control valve to pump regulator
Feedback signal from the engine control sensor to the engine and
Front pump delivery pressure
Pump supply pressure at front pump outlet.
Rear pump delivery pressure
Pump supply pressure at rear pump outlet.
Arm in pilot pressure
Pilot pressure from pilot controller to control valve pilot cap.
Pressure measured at flow regulator valve.
Rear pump control pressure
Pilot signal from rear pump control valve to pump regulator.
RPM dial angle
Electrical signal from engine rpm dial.
Arm regenerative control pressure
Pilot pressure from arm regenerative solenoid valve to arm
regenerative valve in left control valve. A calculated pressure, not
Propel motor control pressure
Pilot pressure from propel speed change solenoid valve to speed
selector valve in propel motors. A calculated pressure, not actual
Speed sense control pressure
Pilot pressure from speed sense solenoid valve to front and rear
pump regulators. A calculated pressure, not actual pressure.
Power boost control pressure
Pilot pressure from power boost solenoid valve to the piston in the
system relief valve. This is a calculated pressure, not the actual
Target engine speed
Set by engine rpm dial position. Used with actual engine speed
and pump delivery pressure signals to control the load (pulldown)
on engine by energizing speed sensing solenoid valve to reduce
pump flow. (Approximately 150 rpm less than actual engine speed
under no load.)
Actual engine speed
Engine speed sensed by engine speed sensor. Sensor is located
in the pump drive gearbox adjacent to front pump.
EC motor position
Electrical signal from engine and pump controller to engine control
Boom Up, Dig,
Electrical signal from pressure switches to engine and pump
controller when function is actuated. Boom up is located on flow
regulator valve. Dig is located at the swing park brake release
valve. Propel is located at the shuttle valve fasten to the front of
control valve mounting bracket.
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