Multiquip LS-300P - Manual (Page 78)

PAGE 78 — MAYCO LS300P CONCRETE PUMP • OPERATION MANUAL — REV. #0 (06/09/14)
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.
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.
Proximity switch C
Digital Control Box not sending signal. Check screen #5 for operational status.
Shuttle cylinder short stroking not
energizing proximity sensor.
• Misaligned hopper
• Discharge nipple seizing
• Hopper outlet requires lubrication
Proximity switch D
Digital Control Box not sending signal. Check screen #5 for operational status.
Shuttle cylinder short stroking not
energizing proximity sensor.
• Misaligned hopper
• Discharge nipple seizing
• Hopper outlet requires lubrication