troubleshooting (pump)
Troubleshooting (pump — Continued)
Symptom | Possible Problem | Solution | |
Pump Engine will idle but | Throttle Control Block Solenoid | Check for burned out solenoid and computer | |
not increase to full operating | |||
speed | not engergizing | ground activation voltage. | |
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Battery voltage falls below | Blown out Fuse | Check the fuse | |
Dead battery | Check the charge on the battery | ||
12VDC on digital display, | |||
| Check the wiring connections and verify power | ||
causing engine not to start | Wiring connection inside Control Box | ||
| is reaching ignition switch | ||
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| Insuffi cient oil | Check oil level and for closed suction strainer | |
| Air in system | Check for aeration reservoir | |
Main Hydraulic Pump Noisy | Vacuum leak in suction line | ||
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| Excessive pump wear | Repair or replace | |
| Excessive engine speed | Check for correct engine RPM | |
| Low engine speed | Check engine RPM | |
Engine bogs down | Main relief cartridge set to low | Adjust relief cartridge | |
Engine overloaded when pumping | Decrease volume control on main pump | ||
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| Material hose pack | ||
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| Low engine speed | Check engine RPM | |
Machine does not deliver | Volume control set to low | Adjust control to full open setting | |
volume and pressure |
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Main hydraulic pressure too low | Check for proper pressure or for contaminated | ||
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| relief cartridge | ||
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| Check fan electrical connection or for burnt fan | |
| Cooling fan | motor. | |
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| Fan rotating in wrong direction | |
Hydraulic fl uid gets hot | Contaminated cooler fi ns | Clean cooler fi ns | |
Return fi lter element closed | Replace fi lter | ||
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| Main relief cartridge contaminated or | Replace or set to proper pressure | |
| set too low | ||
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| Hydraulic oil level too low | Fill to proper level | |
| Accumulator bottle low on notrogen | Check precharge pressure 1100 PSI | |
| Contaminated safety relief cartridge | Replace cartridge | |
Accumulator gauge reads | Defective unloader cartridge electrical | Replace | |
below 1750 PSI | coil |
| |
| Unloader cartridge coil not energizing | Check for 12 Volt signal voltage | |
| Defective gear pump | Replace pump | |
| Excessive amount of hydraulic on | Inspect cylinder. Check values for | |
Cylinders not completely | cylinder rod side | contamination or faulty spring | |
extended (short stroke) | Hydraulic cylinder piston head seal | Replace seals | |
| leaking | ||
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page 74 — MAYCO LS600P CONCRETE PUMP • operation manual — rev. #0 (05/13/13)
