Hypertherm HyPrecision 100D, Instruction Manual

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8 Hydraulic
Hydraulic Overview
Hydraulic pressure and flow from a pressure compensated variable displacement (PCVD) piston pump
is passed through a spool valve where it is directed to either side of the hydraulic piston in the intensifier
center section. The intensifier will reciprocate and create high-pressure water as output.
The pump compensator and the control manifold assembly control the hydraulic pump pressure. The
manifold assembly is connected to the pressure compensator port on the pump. The control manifold
has a pressure control valve for adjusting pierce pressure; the cut pressure is adjusted using the pump
compensator. When the pump is turned off, a solenoid valve in the manifold opens and the hydraulic
pressure goes to its minimum. Some pumps may have additional hydraulic components for electronic
control of the pump pressure. Refer to the
Drawings and Parts Lists section of the manual for detailed
information on your pumps hydraulic circuit.
The larger pumps filter and clean oil using a "Kidney Loop". In systems with a kidney loop, the oil is
drawn from the hydraulic tank through the gear pump mounted on the end of the PCVD pump. The oil
then passes through the filter and heat exchanger before returning to the hydraulic tank.
WARNING
Before starting any service or maintenance, turn off electrical power and relieve
all water and hydraulic pressure. Proper lockout/tag-out procedures must always
be followed prior to performing any maintenance of the unit.
8.1 Hydraulic Oil
Hydraulic Oil Requirements
Please reference chapter 9 for specific pump requirements.
Adding New Hydraulic Oil
Hypertherm intensifier pumps require
Castrol Hyspin
32 or
Hyspin 46 Hydraulic
oil.
To add new oil, follow this procedure:
1. Verify that the ball valve on the bottom of the hydraulic tank is closed.
2. Unscrew the filler/breather cover ( 1 ) on top of the hydraulic tank.
3. Fill with the appropriate oil until the oil level is visible at the top
of the sight gauge at the front of the hydraulic tank. Do not
overfill tank!
4. Replace the filler/breather cover ( 1 ).
Evaluating Old Hydraulic Oil
Oil quality can be estimated by the appearance or smell. New oil is almost clear and has no odor. When
the oil color is like dark honey and it has a poor odor, it is time to replace the oil. A supplier can
measure the oil quality more precisely. Water and/or high temperatures can damage the oil. Any time
the oil is replaced, the hydraulic filter should also be replaced.
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