ELLS Troubleshooting Procedure
Each function (winch up, winch down, extension in, etc.) is actuated by a solenoid that shifts the
valve spool to perform the particular function. The solenoids are located on the valve bank. Each
solenoid has two wires protruding with a connector on the end that is plugged into a connector
on the wire harness for the crane. The wires are marked with the crane function, and ground.
Determine which solenoid actuates which function:
1 Unplug the connector protruding from the pressure switch (Some models may have wire
terminals instead of a connection. Detach the wires from the pressure switch.)
2 Using a multi-meter, check continuity (setting on multi-meter that “beeps” if two wires are
connected) between the ground receptacle on the connector that plugs into the connector on
the “LOWER UP” solenoid and the ground receptacle on the connector that plugs into the
connector that plugs into the connector on the “WINCH UP” solenoid. They should not be
continuous. If they are, the harness is the problem and must be either repaired or replaced.
3 Reconnect the pressure switch.
4 The crane functions are labeled on each wire. When you have identified the solenoid which
controls the function you want to test, unplug the connector protruding from the solenoid, and
unplug the connector for the pressure switch. Again using the multi-meter, check continuity
for the Lower Boom Up, Winch Up, Extension Out, and Ground functions. Each function
should be continuous with the ground receptacle on the connector that plugs into the
connector on the pressure switch. If they are not, there is a problem with the harness which
either needs to be repaired or replaced.
5 Reconnect the pressure switch.
6 If there is no problem found with the harness, the pressure switch is the problem and it will
need to be replaced.
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