TM 5-3805-281-24-1
Tests
EXCAVATOR DIAGNOSTICS PROGRAM--
MONITOR DATA ITEMS
NOTE: This chart lists engine and pump controller dynamic data items that can be monitored by the excavator
diagnostics program.
330LCR MONITOR DATA ITEMS
Item
Display List
Units
Description
1
Front pump control pressure
psi
Pilot signal from the front pump control valve to pump regulator
2
EC angle
V
Feedback signal from the engine control sensor to the engine and
pump controller
3
Front pump delivery pressure
psi
Pump supply pressure at front pump outlet.
4
Rear pump delivery pressure
psi
Pump supply pressure at rear pump outlet.
5
Arm in pilot pressure
psi
Pilot pressure from pilot controller to control valve pilot cap.
Pressure measured at flow regulator valve.
6
Rear pump control pressure
psi
Pilot signal from rear pump control valve to pump regulator.
8
RPM dial angle
V
Electrical signal from engine rpm dial.
9
Arm regenerative control pressure
psi
Pilot pressure from arm regenerative solenoid valve to arm
regenerative valve in left control valve. A calculated pressure, not
actual pressure.
10
Propel motor control pressure
psi
Pilot pressure from propel speed change solenoid valve to speed
selector valve in propel motors. A calculated pressure, not actual
pressure.
11
Speed sense control pressure
psi
Pilot pressure from speed sense solenoid valve to front and rear
pump regulators. A calculated pressure, not actual pressure.
12
Power boost control pressure
psi
Pilot pressure from power boost solenoid valve to the piston in the
system relief valve. This is a calculated pressure, not the actual
9025
pressure.
25
13
Target engine speed
rpm
Set by engine rpm dial position. Used with actual engine speed
23
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.)
14
Actual engine speed
rpm
Engine speed sensed by engine speed sensor. Sensor is located
in the pump drive gearbox adjacent to front pump.
15
EC motor position
steps
Electrical signal from engine and pump controller to engine control
motor.
20
Pressure switch
Boom Up, Dig,
Electrical signal from pressure switches to engine and pump
Propel
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.
Continued on next page
CED,TX08227,3018 1916MAR981/2
