MULTIQUIP LS450 - Troubleshooting (Electrical); Malfunction Reading (Screen 1)

PAGE 80 — MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21)
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.