Troubleshooting (Electrical) - MULTIQUIP MAYCO LS600 Operation And Parts Manual

Problem
Main Hydraulic Pump Noisy
Engine bogs down
Machine does not deliver volume and
pressure
Hydraulic fluid gets hot
Accumulator gauge reads below 1750
PSI
Concrete slurry in lubrication box
Material cylinder piston cups squeel
Cylinders not completely extended
(short stroke)
PAGE 64 — MAYCO LS600 PUMP — OPERATION AND PARTS MANUAL — REV. #4 (9/15/11)
LS600 PUMP
TABLE 9. PUMP TROUBLESHOOTING (CONTINUED)
Possible Problem
Insufficient oil
Air in system
Excessive pump wear
Excessive engine speed
Low engine speed
Main relief cartridge set to low
Engine overloaded when pumping
Low engine speed
Volume control set to low
Main hydraulic pressure too low
Cooling fan
Contaminated cooler fins
Return filter element closed
Main relief cartridge contaminated or
set too low
Hydraulic oil level too low
Accumulator bottle low on notrogen
Contaminated safety relief cartridge
Defective unloader cartridge electrical
coil
Unloader cartridge coil not energizing Check for 12 Volt signal voltage
Defective gear pump
Worn or defective urethane cups or
worn material cylinder
Low on lubrication
Excessive amount of hydraulic on
cylinder rod side
Hydraulic cylinder piston head seal
leaking
— TROUBLESHOOTING (PUMP)
To Troubleshoot
Check oil level and for closed suction
strainer
Check for aeration reservoir
Vacuum leak in suction line
Repair or replace
Check for correct engine RPM
Check engine RPM
Adjust relief cartridge
Decrease volume control on main
pump
Material hose pack
Check engine RPM
Adjust control to full open setting
Check for proper pressure or for
contaminated relief cartridge
Check fan electrical connection or for
burnt fan motor.
Fan rotating in wrong direction
Clean cooler fins
Replace filter
Replace or set to proper pressure
Fill to proper level
Check precharge pressure 1100 PSI
Replace cartridge
Replace
Replace pump
Replace
Check oil level
Inspect cylinder. Check values for
contamination or faulty spring
Replace seals