Lift Pull Arm Hydraulic - Pneumatic Diagram - spanesi MINIBENCH MAXIPLUS Manuel D'utilisation Et De Maintenance

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7.3. LIFT PULL ARM HYDRAULIC - PNEUMATIC DIAGRAM

The operating diagram of the hydraulic- pneumatic system of the lift pull arm is composed of the following main
components :
1)
Hydraulic-pneumatic pump for pull bar.
2)
Pull arm piston body.
3)
Bar traction valve.
4)
Traction release control valve.
5)
Check valve.
6)
Unidirectional valve.
7)
Pressure relief valve.
8)
Oil fi lter.
9)
Pump casing.
10) Air silencer.
11) Hydraulic-pneumatic pump oil tank.
12) Auxiliary fi tting for oil use.
13) Compressed air intake.
• OPERATION:
When the pedal (3) on the hydraulic pneumatic pump (1)
is pressed, the pump casing (9) pressurises the hydraulic
circuit and sends the pressurised oil to the plunger chamber
of the pull arm piston (2) which tensions the bar.
When you wish to release the tension, press the pedal (4)
in the opposite direction, thus connecting the main duct
to the pump outlet and allowing the oil to fl ow to the tank
(11).
In the absence of pressure, the piston will return to its rest
position due to the effect of the spring inside.
The pressure relief valve (7) prevents the pressure from
exceeding the value established by the manufacturer.The
relief valve must not be tampered with:
WARNING! Alteration of the relief valve will
seriously damage the pull arm and MINIBENCH
MAXIPLUS:
SPANESI
responsibility for injury to persons and animals
or damage to property due to alteration of the
valve.
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