Troubleshooting (Pump) - MULTIQUIP LS450 Operation Manual

Symptom
Main Hydraulic Cylinder will
not cycle
Hopper Remix Paddles will
not rotate
Shuttle Cylinder does not
stroke
Shuttle Cylinder slow to
complete stroke
Concrete slurry in
lubrication box
Material cylinder piston
cups squeal
PAGE 76 — MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21)

Troubleshooting (Pump)

Possible Problem
Incorrect System Operating Pressure
Incorrect Engine RPM setting
Contaminated Main Relief Valve
Obstructed Material Cylinders
Incorrect Directional Control
Operating Pressure
Contaminated Relief Valve
Broken Shaft Coupler Key
Loose Shaft Retaining Set Collar
Incorrect Accumulator System
Pressure
Contaminated Relief Valve
Swing Solenoid not energizing
Swing Valve not functioning properly
Improper Flow Control setting
Incorrect Engine RPM setting
Incorrect Main Hydraulic
System Operating Pressure
Contaminated Swing Relief Cartridge
Low Accumulator System Pressure
Hopper Discharge Nipple Seal
improperly lubricated
Worn or defective urethane cups or
worn material cylinder
Low on lubrication
TROUBLESHOOTING (PUMP)
Check the pump pressure gauge. Verify it is
approx. 4,300–4,400 PSI
Verify the engine's high RPM speed is set to
2,400
Check the manifold for a contaminated Relief
Valve
Check for obstructions (dried material) inside
the cylinders
Verify the Directional Control operating
pressure is approx. 1,000 PSI
Check the manifold for a contaminated Relief
Valve
Check the Hopper Remixer shaft coupler for a
broken key
Check the Shaft Retaining Set Collar for
tightness
Check the system pressure reading. Verify it is
approx. 1,750 PSI
Check the manifold for a contaminated Relief
Valve
Check for burned out solenoid and 12V signal
voltage
Manually cycle the pump using the manual
cylinder jogging switch
Fully open Flow Control Vave
Verify the engine's high RPM speed is set to
2,400
Check the pump pressure gauge. Verify it is
approx. 4,300–4,400 PSI
Check the manifold for contaminated Swing
Relief Cartridge
Check the accumulator pressure reading. Verify
it is approx. 1,750 PSI
Check the Hopper Discharge Nipple Seal for
seizing and lack of lubricant
Replace
Check oil level
Solution