Though all Hypertherm Waterjet systems are designed with
our Advanced Intensifier Technology, all waterjets require maintenance. One of
the most common failures that we see is called “intensifier overstroke.”
This condition occurs when the piston in your intensifier
strokes faster than the output flow of the waterjet pump can support. When this
occurs, a message will appear on the waterjet display similar to the one shown
below. The stroke rate for any particular intensifier is determined by the size
of the hydraulic pump, and therefore is essentially a fixed rate.
To diagnose if an overstroke condition exists, first shut
off the cutting head and bring the waterjet pump to full pressure. Using the
display on the pump, monitor the intensifier with the pump at full pressure and
the cutting head closed to see if any stroking occurs. No stroking should occur.
If it does, reasons could include:
1. Problem with the high-pressure poppet
2. Leak in the high-pressure plumbing
3. Waste water outlet bleed-down valve is leaking
4. Cutting head needle and seat are leaking
Though there are four possible root causes, the most
likely issue is a low-pressure poppet that is sticking, worn, or damaged.
If you believe you have an overstroke condition but can’t
find the problem, there is a troubleshooting chart which can help you dig
deeper into this issue. Contact our Technical Service team at (651) 294-8600 or
waterjet@hypertherm.com and we’ll
be happy to help you do that.
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