TM 5-3805-281-24-1
Sub-System Diagnostics
1b OVERLOAD ALARM
Turn key switch OFF.
YES: Alarm is OK. Go to
(H9) CHECK
next check.
Jumper alarm ground terminal (BLK wire) to cab ground.
NO: Replace alarm.
Turn key switch ON.
Does alarm sound?
Turn key switch OFF.
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1c OVERLOAD ALARM
Operate excavator to position boom to either side of
YES: Switch is OK. Go to
PROXIMITY SWITCH
excavator.
next check.
9015
(B32) CHECK
15
Turn key switch OFF.
NO: Switch has failed.
102
Replace.
Remove harness connector from proximity switch.
Connect ohmmeter to terminals 1 and 2 of switch
connector.
T120671 UN25MAR99
Does ohmmeter read continuity?
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1d OVERLOAD ALARM
Disconnect harness from overload alarm relay.
YES: Relay is OK. Go to
RELAY (K16) CHECK
next check.
NO: Relay has failed.
Does ohmmeter read open?
Replace.
Connect 24 volts to relay terminal 85 and ground
terminal 86.
T7447BG
1914JAN91
Does relay "click"?
Connect ohmmeter to terminals 30 and 87.
Does ohmmeter read continuity?
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