10 / JACK Instruction Manual 3789833-20200901
Original Instruction
BEFORE USE
Occasionally during shipment and/or handling, air becomes trapped
within the hydraulic system which interferes with the Jack’s
performance. To release the trapped air, please perform the following
with the Jack in an upright position:
1. Depress the red lowering lever for a period of 5-10 seconds.
2. Depress the black pressure relief buton on top of the Jack
for 5-10 seconds.
3. Pump the Jack handle several times to ensure no bubbling noises
are present.
4. Ensure the pump operates smoothly before puting into service.
OPERATING PRINCIPLES
• When the lowering lever is not depressed, upward strokes of the
Jack handle draws oil from the reservoir tank into the piston cavity.
Hydraulic pressure holds the valve closed, which keeps the oil in
the piston cavity.
• Downward strokes of the Jack handle releases oil into the cylinder,
which forces the pump system upward inside the shat.
• When the Jack reaches maximum extension, oil is bypassed back
into the reservoir to prevent an overextended ram stroke and
possible damage to the Jack.
• Depressing the RED lowering lever allows the oil to flow through
the pump and back into the reservoir tank. This releases hydraulic
pressure from below the pump system and allows the Jack to
retract (lower).
JACK
OPERATION
Prior to use, consider wind conditions and suitability for operation
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