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PAGE 74 — MAYCO LS300G CONCRETE PUMP • OPERATION MANUAL — REV. #2 (09/09/19)
TROUBLESHOOTING (PUMP)
Troubleshooting (Pump)
Symptom
Possible Problem
Solution
Main Hydraulic Cylinder will
not cycle
Incorrect System Operating
Pressure?
Check the pump pressure gage. Verify it is
approx. 3100 — 3200 PSI
Incorrect Engine RPM setting?
Verify the engine's high RPM speed is set to
2500 — 2550 RPM
Contaminated Main Relief Valve?
Check the manifold for a contaminated Relief
Valve
Obstructed Material Cylinders?
Check for obstructions (dried material) inside
the cylinders
Shuttle Cylinder slow to
complete stroke
Improper Flow Control setting?
Fully open Flow Control Valve
Incorrect Engine RPM setting?
Verify the engine's high RPM speed is set to
2500 — 2550 RPM
Incorrect Main Hydraulic
System Operating Pressure?
Check the pump pressure gage. Verify it is
approx. 3200 PSI
Hopper Discharge Nipple Seal
improperly lubricated?
Check the Hopper Discharge Nipple Seal for
seizing and lack of lubricant
Shuttle Cylinder slams too
hard
Low accumulator pressure?
Check accumulator pressure 550 PSI
Concrete slurry in
lubrication box
Worn or defective urethane cups or
worn material cylinder?
Replace
Material cylinder piston
cups squeal
Low on lubrication?
Check oil level
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
Summary of Contents for MAYCO LS300G
Page 2: ...PAGE 2 MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PROPOSITION 65 WARNING...
Page 5: ...MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PAGE 5 NOTES...
Page 73: ...MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PAGE 73 NOTES...
Page 85: ...MAYCO LS300G CONCRETE PUMP OPERATION MANUAL REV 2 09 09 19 PAGE 85 HYDRAULIC SYSTEM DIAGRAM...