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MAYCO LS600P CONCRETE PUMP • OPERATION MANUAL — REV. #1 (09/09/19) — PAGE 77
TROUBLESHOOTING (ELECTRICAL)
Troubleshooting (Electrical)
Malfunction Reading (Screen 1)
Possible Problem
Solution
Main A OPEN
Burnt 12 V cycling solenoid.
Measure solenoid coil resistance. It should read 6
ohms. Replace burnt solenoid.
Wire connection broken.
Replace broken wire.
Main A SHORTED
The 12-volt cycling solenoid is shorted
directly to ground.
Measure solenoid coil resistance. It should read 6
ohms. Replace shorted solenoid.
Wire connection is shorted directly to the
ground.
Correct connection.
Main B OPEN
Burnt 12 V cycling solenoid.
Measure solenoid coil resistance. It should read 6
ohms. Replace burnt solenoid.
Wire connection broken.
Replace broken wire.
Main B SHORTED
The 12-volt cycling solenoid is shorted
directly to ground.
Measure solenoid coil resistance. It should read 6
ohms. Replace shorted solenoid.
Wire connection is shorted directly to the
ground.
Correct connection.
Swing OPEN
Burnt 12 V cycling solenoid.
Measure solenoid coil resistance. It should read 6
ohms. Replace burnt solenoid.
Wire connection broken.
Replace broken wire.
Swing SHORTED
The 12-volt cycling solenoid is shorted
directly to ground.
Measure solenoid coil resistance. It should read 6
ohms. Replace shorted solenoid.
Wire connection is shorted directly to the
ground.
Correct connection.
Throttle solenoid open
Burnt 12 V cycling solenoid.
Measure solenoid coil resistance. It should read 6
ohms. Replace burnt solenoid.
Wire connection broken.
Replace broken wire.
Throttle solenoid shorted
The 12-volt cycling solenoid is shorted
directly to ground.
Measure solenoid coil resistance. It should read 6
ohms. Replace shorted solenoid.
Wire connection is shorted directly to the
ground.
Correct connection.
Fuel solenoid open
Burnt 12 V cycling solenoid.
Measure solenoid coil resistance. It should read 6
ohms. Replace burnt solenoid.
Wire connection broken.
Replace broken wire.
Fuel solenoid shorted
The 12-volt cycling solenoid is shorted
directly to ground.
Measure solenoid coil resistance. It should read 6
ohms. Replace shorted solenoid.
Wire connection is shorted directly to the
ground.
Correct connection.
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