Troubleshooting Check List
All servicing should be done by qualified personnel. Qualified personnel should be able to read and understand wiring and hydraulic diagrams. They should be able to troubleshoot live electrical circuits safely and in accordance with accepted practice. FOR SAFETY’S SAKE, if in doubt, please contact your distributor or Presto Lifts at (800)
Before servicing the unit, read and understand this entire section and the section entitled “Operating Instructions.”
WARNING!
Before performing any maintenance on this unit, lower the platform completely.
If the platform will not raise:
CAUTION!
If the platform will not raise, do not continue to hold the Up button for
more than 2 or 3 seconds. You may damage the pump.
1.The sensor and reflector are mounted at the front of the unit, near the floor level. There may be something blocking the beam of the photo eye toe guard. The reflector may need to be cleaned or replaced.
2.The load may be too heavy. Check the actual weight of the load. The rated capacity of the unit is shown on the name plate.
WARNING!
DON’T CHANGE THE SETTING OF THE RELIEF VALVE. If you do change the setting, this may cause a hydraulic part to fail. The platform may drop suddenly. Someone may be hurt, and the unit and load may be damaged. The hydraulic parts in the lift are designed to handle a certain amount of pressure. The relief valve is set to relieve this pressure before it becomes too great. The relief
12PRESTO P4 LEVEL LOADER OWNER’S MANUAL
