Multiquip LS500 ユーザーズマニュアル

Problem

Possible Problem

To Troubleshoot

Shuttle Cylinder does not stroke

Incorrect Accumulator System 
Pressure

Check the system pressure reading. 
Verify it is approx. 1750 PSI

Contaminated Relief Valve

Check the manifold for a 
contaminated Relief Valve

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

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 2550

Incorrect Main Hydraulic System 
Operating Pressure

Check the pump pressure gauge. 
Verify it is approx. 4400 PSI

Contaminated Swing Relief Cartridge

Check the manifold for contaminated 
Swing Relief Cartridge

Low Accumulator System Pressure

Check the accumulator pressure 
reading. Verify it is approx. 1750 PSI

Hopper Discharge Nipple Seal 
improperly lubricated

Check the Hopper Discharge Nipple 
Seal for seizing and lack of lubricant

Misaligned hopper creating excessive 
friction on the outlet nipple bearing 
sleeve

Realign hopper ensuring S-tube is 
rotating in the center of the hopper 
outlet.

Lack of lubrication

Grease Nun Plate Bushing

Pump Engine will idle but not increase 
to full operating speed

Throttle Control Block Solenoid not 
energizing

Check for burned out solenoid and 
12V signal 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