Preventive maintenance
DynaMAX 550P/560P/575P Waterjet Pump Operator Manual 811390 105
Parts, tools, and materials
1. Tape a sheet of lapping paper on a granite lapping block. Make sure that the paper is smooth
and flat.
2. Put the check valve or poppet face flat on the lapping paper and move it back and forth. Apply
light pressure.
3. After each stroke, turn the flat face of the part 45°.
4. Do this procedure again until the face is smooth and flat and has an almost mirrored finish.
Repair the high-pressure cylinders
12-micron lapping paper
(included in the DynaMAX standard tool kit.)
Granite lapping block
(included in the DynaMAX standard tool kit.)
Masking tape
Isopropyl alcohol
Clean towels
Repair the high-pressure cylinders every 500 hours.
Replace the high-pressure cylinders:
• every 3,000 hours
• if the cylinder is chipped or cracked
Debris in the cylinder can cause the seals or the poppets to fail.
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