TM 5-3805-280-24-1
Diagnostic Information
Propel Speed Change Solenoid
Valve (SI)
Propel Pressure Switch
Dig Pressure Switch
Operational Function
Sends a pilot pressure signal to shift
Senses when propel function is
Senses when a dig function is
speed selector valve spool in propel
actuated.
actuated.
motors.
Control Problems
No pressure signal sent to shift
No electrical signal sent to engine
No electrical signal sent to
speed selector valve spool.
and pump controller.
engine and pump controller.
Machine Symptoms
Travel speed does not increase
Engine speed does not increase
Engine speed does not increase
when propel speed switch is turned
from auto-idle speed when propel
from auto-idle speed when a dig
to fast speed (rabbit).
function actuated. Propel speed
function actuated.
does not increases with propel
speed switch in fast speed (rabbit).
Travel alarm does not sound.
Laptop Computer with
--
--
--
Excavator Diagnostic
Software Self-Diagnostic
Functions
Laptop Computer with
Monitor No. 10, Propel motor control
Monitor No. 20, Pressure switch.
Monitor No. 20, Pressure switch.
Excavator Diagnostic
pressure.
Software Monitoring
Function
Harness Check
Install JT07062 Test Harness. Check
--
--
that indicator light in on.
Notes
If indicator light is off, check wiring
Located at the front of right control
Located at the front of left control
harness. Also check switches and
valve.
valve.
sensors in propel motor speed
change circuit.
Description of Operation
See Propel Motor Speed Change
See Propel Motor Speed Change
See Auto-Idle Mode Speed
Circuit Operation in Group 9025-05.
Circuit Operation in Group 9025-05
Control Circuit Operation in
9025
or Auto-Idle Mode Speed Control
Group 9010-05.
15
Circuit Operation in Group 9010-05.
5
Continued on next page
TX,15,GG2238 1913AUG984/10
6-94
