Autoquip AUTO-TILT PORTABLE TILTER - Manual (Page 7)

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CAUTION!
Never run the pump for more than a couple of seconds without pumping oil.
This applies to low oil conditions, improper motor rotation, running the
pump against the relief pressure, running overloaded beyond capacity, or
running at reduced speed because of pinched or obstructed hydraulic lines.
CAUTION!
Do not operate the power unit on relief for more than a few seconds. When
on relief, the valve will make a squealing sound.
CAUTION!
Precautions should be taken to prevent the introduction of contaminates
such as dirt or other foreign material into the system through open fittings,
pipes or disassembled components. Contamination will ruin the hydraulic
system.
CAUTION!
Use only approved oils in the tilter. See “Specifications” section.
DANGERS, WARNINGS & CAUTIONS