Multiquip LS-300P - Manual (Page 75)

MAYCO LS300P CONCRETE PUMP • OPERATION MANUAL — REV. #0 (06/09/14) — PAGE 75
TROUBLESHOOTING (PUMP)
Troubleshooting (Pump — Continued)
Symptom Possible Problem Solution
Main Hydraulic Pump Noisy
Insuffi cient oil Check oil level and for closed suction strainer
Air in system
Check for aeration reservoir
Vacuum leak in suction line
Excessive pump wear Repair or replace
Excessive engine speed Check for correct engine RPM
Engine bogs down
Low engine speed Check engine RPM
Main relief cartridge set to low Adjust relief cartridge
Engine overloaded when pumping
Decrease volume control on main pump
Material hose pack
Machine does not deliver
volume and pressure
Low engine speed Check engine RPM
Volume control set to low Adjust control to full open setting
Main hydraulic pressure too low
Check for proper pressure or for contaminated
relief cartridge
Hydraulic fl uid gets hot
Cooling fan
Check fan electrical connection or for burnt fan
motor.
Fan rotating in wrong direction
Contaminated cooler fi ns Clean cooler fi ns
Return fi lter element closed Replace fi lter
Main relief cartridge contaminated or
set too low
Replace or set to proper pressure
Hydraulic oil level too low Fill to proper level
Cylinders not completely
extended (short stroke)
Excessive amount of hydraulic on
cylinder rod side
Inspect cylinder. Check values for
contamination or faulty spring
Hydraulic cylinder piston head seal
leaking
Replace seals