TM 5-3805-281-24-1
Sub-System Diagnostics
OVERLOAD ALARM CIRCUIT OPERATIONAL
INFORMATION
The following conditions must be met for the circuit to
function:
Key switch ON
Voltage present at auxiliary power 10-amp fuse F19
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OVERLOAD ALARM CIRCUIT THEORY OF
OPERATION
9015
15
100
The overload alarm circuit contains: proximity switch B32,
pressure switch B33, relay K16, and alarm H9.
Operating voltage for the overload alarm circuit is applied
from fuse F19, through terminal strip X27, terminal 1 to
the overload alarm power terminal, terminal 30 of relay
K16, and terminal 1 of the proximity switch. When the
boom is positioned on either side of the machine,
proximity switch B32 closes and energizes relay K16 by
applying +24 volts to relay terminal 85. With relay K16
energized, +24 volts is applied from terminal 87 to
pressure switch B33, enabling the pressure switch. If the
boom cylinder hydraulic pressure exceeds 3300 psi,
switch B33 closes, activating the alarm, by applying
ground to the overload alarm ground terminal.
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1916MAR991/1