LS600 PUMP — TROUBLESHOOTING (PUMP)
TABLE 9. PUMP TROUBLESHOOTING (CONTINUED)
Problem | Possible Problem | To Troubleshoot | |
| Insufficient oil | Check oil level and for closed suction | |
| strainer | ||
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Main Hydraulic Pump Noisy | Air in system | Check for aeration reservoir | |
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 | |
| Main relief cartridge set to low | Adjust relief cartridge | |
Engine bogs down |
| Decrease volume control on main | |
| Engine overloaded when pumping | pump | |
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| Material hose pack | |
| Low engine speed | Check engine RPM | |
Machine does not deliver volume and | Volume control set to low | Adjust control to full open setting | |
pressure | Main hydraulic pressure too low | Check for proper pressure or for | |
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| contaminated relief cartridge | ||
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| Check fan electrical connection or for | |
| Cooling fan | burnt fan motor. | |
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| Fan rotating in wrong direction | |
Hydraulic fluid gets hot | Contaminated cooler fins | Clean cooler fins | |
Return filter element closed | Replace filter | ||
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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 below 1750 | Defective unloader cartridge electrical | Replace | |
PSI | coil | ||
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| Unloader cartridge coil not energizing | Check for 12 Volt signal voltage | |
| Defective gear pump | Replace pump | |
Concrete slurry in lubrication box | Worn or defective urethane cups or | Replace | |
worn material cylinder | |||
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Material cylinder piston cups squeel | Low on lubrication | Check oil level | |
| Excessive amount of hydraulic on | Inspect cylinder. Check values for | |
Cylinders not completely extended | cylinder rod side | contamination or faulty spring | |
(short stroke) | Hydraulic cylinder piston head seal | Replace seals | |
| leaking | ||
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PAGE 64 — MAYCO LS600 PUMP — OPERATION AND PARTS MANUAL — REV. #4 (9/15/11)