Multiquip LS-600P - Manual (Page 74)

page 74 — MaYCO LS600p CONCReTe pUMp • OpeRaTiON MaNUaL — Rev. #0 (05/13/13)
Troubleshooting (pump — Continued)
Symptom Possible Problem Solution
Pump Engine will idle but
not increase to full operating
speed
Throttle Control Block Solenoid
not engergizing
Check for burned out solenoid and computer
ground activation voltage.
Battery voltage falls below
12VDC on digital display,
causing engine not to start
Blown out Fuse Check the fuse
Dead battery Check the charge on the battery
Wiring connection inside Control Box Check the wiring connections and verify power
is reaching ignition switch
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
Accumulator gauge reads
below 1750 PSI
Accumulator bottle low on notrogen Check precharge pressure 1100 PSI
Contaminated safety relief cartridge Replace cartridge
Defective unloader cartridge electrical
coil
Replace
Unloader cartridge coil not energizing Check for 12 Volt signal voltage
Defective gear pump
Replace pump
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
tROubLEShOOtInG (PuMP)