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MAYCO LS300G CONCRETE PUMP • OPERATION MANUAL — REV. #2 (09/09/19) — PAGE 79
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
Summary of Contents for MAYCO LS300G
Page 2: ...PAGE 2 MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PROPOSITION 65 WARNING...
Page 5: ...MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PAGE 5 NOTES...
Page 73: ...MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PAGE 73 NOTES...
Page 85: ...MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PAGE 85 HYDRAULIC SYSTEM DIAGRAM...