TM 5-3805-281-24-1
Sub-System Diagnostics
BOOM UP PRESSURE
Turn key switch OFF.
YES: Pressure switch is
SWITCH (B13) CHECK
OK. Check switch
harness. If harness is OK,
Disconnect wiring harness at boom up pressure switch.
engine and pump
controller may have
Connect ohmmeter to pins 1 and 2 of pressure switch
failed.
connector.
NO: Boom up pressure
With engine running and pilot control lever forward,
switch has failed.
actuate boom up lever.
T112437 UN05DEC97
Replace.
Is continuity measured when boom up lever is actuated?
9015
15
88
1/1
DIG PRESSURE SWITCH
Turn key switch OFF.
YES: Pressure switch is
(B14) CHECK
OK. Check switch
harness. If harness is OK,
Disconnect wiring harness at dig pressure switch.
engine and pump
controller may have
Connect ohmmeter to pins 1 and 2 of pressure switch
failed.
connector.
NO: Dig pressure switch
With engine running and pilot control lever forward,
has failed. Replace.
slowly actuate arm in lever while observing ohmmeter.
T112437 UN05DEC97
Is continuity measured as arm in lever is actuated?
1/1
PROPEL PRESSURE
Turn key switch OFF.
YES: Pressure switch is
SWITCH (B15) CHECK
OK. Check for continuity
from harness connector
Disconnect wiring harness at propel pressure switch.
pin 1 to ground. If OK, go
to next check.
Connect ohmmeter to pins 1 and 2 of pressure switch
connector.
NO: Propel pressure
switch has failed.
With engine running and pilot control lever forward,
Replace.
slowly actuate propel lever while observing ohmmeter.
T112437 UN05DEC97
Is continuity measured as propel lever is actuated and
track begins to move?
1/1
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