Vestil HPC-400 - Manual (Page 11)

01/08 HPC-400, 22-126-120, 0108
V ESTIL M FG . C O . 11
T HE P OWER U NIT ’ S O PERATION – HPC-400
The electric / hydraulic pail crusher utilizes an electric motor directly coupled to a gear-type hydraulic pump to
produce the needed fluid pressure and flow to allow the cylinder to perform the work of crushing pail.
A hydraulic manifold houses the hydraulic control components, and is bolted directly onto the gear pump.
The power unit’s hydraulic components are all rated for 3,000 psi working pressure.
¬ Important parts of the power unit include:
• The electric motor. Available for all nominal voltages and phases of power supply.
• The gear pump. Its shaft is coupled directly to the shaft of the electric motor.
• The check valve. Its purpose is to prevent the backflow of fluid through the pump. When stopped before a cycle is
completed, the crushing platen will hold its position.
• The pressure relief valve. Its job is to open a path for fluid to flow back to the reservoir in the event that the fluid
pressure built up by the pump exceeds 3,000 psi.
• The solenoid-operated directional valve. This is an electrically-operated cartridge valve. It contains a screen to
keep contaminants from entering the valve.
• The pressure-compensated flow control spool. This rests under the lowering valve, and regulates the fluid flow
back to the reservoir when the valve opens. It allows the forks to always lower at the same rate regardless of
whether there is a load on the fork carriage or not.
• The hydraulic cylinder. This is a double-acting cylinder.
• The hydraulic fluid. The system uses HO150 hydraulic fluid. Any anti-wear hydraulic fluid with a viscosity grade of
150 SUS at 100°F (ISO 32 @ 40°C) such as AW-32 or Dexron transmission fluid are acceptable.
When a pail is loaded and the cabinet door is closed, press the CYCLE START pushbutton. The motor turns, and in
turning it spins the hydraulic gear pump. Hydraulic fluid is pumped through the check valve, through the energized
directional valve, and to the cylinder, which extends to lower the crushing plate.
When the cylinder either strokes out or the pail is crushed completely, a pressure switch causes the directional
valve solenoid to de-energize, the pilot-operated check valve in the hydraulic manifold opens, and the cylinder
retracts to raise the crushing platen.