TM 5-3805-280-24-1
Diagnostic Information
Engine Speed Sensor
Pump Control Pressure Sensor
Pump Pressure Sensor
(N Sensor)
Operational Function
Senses pump control valve pressure
Senses front and rear pump delivery
Senses actual engine speed for
in control valve to control propel
pressure.
the speed sensing system.
motor speed change
Control Problems
No sensor output signal. No control
Loss of propel speed control and HP
Speed sensing system does not
signal to propel speed change
(high power) mode.
function.
Machine Symptoms
Propel motor operates at slow speed
Propel speed does not increase
Does not affect machine
when propel speed switch is turned
when propel speed switch in fast
operation except speed sensing.
to fast speed.
speed (rabbit). HP mode does not
work.
Laptop Computer with
04 and 05 Fault codes are
02 and 03 Fault codes are
--
Excavator Diagnostic
displayed.
displayed.
Software Self-Diagnostic
Functions
Laptop Computer with
Monitor No. 1 and 6, Front and rear
--
Monitor No. 14, Actual engine
Excavator Diagnostic
pump control pressure.
speed.
Software Monitoring
Function
Harness Check
--
--
Notes
At slow idle with functions in neutral
During combined operation, arm
--
typical pressure is 1725--1930 kPa
speed is slow if malfunction is at
(17--19 bar) (250--280 psi). A lower
sensor for rear pump.
pressure may be an open circuit. A
higher pressure may be a short
circuit.
Description of Operation
See Propel Motor Speed Change
See Propel Motor Speed Change
--
Circuit Operation in Group 9025-05.
Circuit Operation in Group 9025-05
9025
or HP (High Power) Mode Speed
15
Control Circuit Operation in Group
3
9010-05.
Continued on next page
TX,15,GG2238 1913AUG982/10
6-92