Multiquip manual LS400/LS500 PUMP - TROUBLESHOOTING PUMP, Pump Troubleshooting Continued

LS400/LS500 PUMP — TROUBLESHOOTING (PUMP)

TABLE 9. PUMP TROUBLESHOOTING (CONTINUED)

Problem	Possible Problem	To Troubleshoot
	Incorrect Accumulator System	Check the system pressure reading.
	Pressure	Verify it is approx. 1750 PSI
	Contaminated Relief Valve	Check the manifold for a
		contaminated Relief Valve
Shuttle Cylinder does not stroke
	Swing Solenoid not energizing	Check for burned out solenoid and
		12V signal voltage
	Swing Valve not functioning properly	Manually cycle the pump using the
		manual cylinder jogging switch
	Improper Flow Control setting	Fully open Flow Control Valve
	Incorrect Engine RPM setting	Verify the engine’s high RPM speed is
		set to 2550
	Incorrect Main Hydraulic System	Check the pump pressure gauge.
	Operating Pressure	Verify it is approx. 4400 PSI
	Contaminated Swing Relief Cartridge	Check the manifold for contaminated
		Swing Relief Cartridge
Shuttle Cylinder slow to complete
		Check the accumulator pressure
stroke	Low Accumulator System Pressure
		reading. Verify it is approx. 1750 PSI
	Hopper Discharge Nipple Seal	Check the Hopper Discharge Nipple
	improperly lubricated	Seal for seizing and lack of lubricant
	Misaligned hopper creating excessive	Realign hopper ensuring S-tube is
	friction on the outlet nipple bearing	rotating in the center of the hopper
	sleeve	outlet.
	Lack of lubrication	Grease Nun Plate Bushing
Pump Engine will idle but not increase	Throttle Control Block Solenoid not	Check for burned out solenoid and
to full operating speed	energizing	12V signal voltage
	Blown out fuse	Check the fuse
Battery voltage falls below 12VDC on	Dead battery	Check the charge on the battery
digital display, causing engine not to		Check the wiring connections and
start
	Wiring connection inside Control Box	verify power is reaching ignition
		switch

MAYCO LS400/LS500 PUMP — OPERATION AND PARTS MANUAL — REV. #6 (09/19/11) — PAGE 63