122 HyPrecision Predictive waterjet pump Operator Manual 810120
5 – Preventive maintenance
Preventive maintenance
High-pressure water system: Bleed-down valve
Refer to the Parts lists section, which starts on page 137.
Remove the bleed-down valve from the pump
Parts, tools, and materials
Do this task when the pump is not operating.
1. Disconnect the compressed air supply hose from the fitting on top of the actuator.
2. Disconnect the water drain tube from the bleed-down valve.
3. Remove the gland nut on the high-pressure collar at the high-pressure fitting of the valve.
4. Remove the bleed-down valve assembly from the pump.
WARNING
Do not tighten a fitting too much. The fitting can fail.
Identify the source of a leak and correct the problem. Refer to Leaks on page 163.
A leak can cause damage to the water fittings.
Put the parts on a clean, dry surface.
Examine parts that are being replaced to identify wear patterns or damage that can show other
problems.
Clean each part with a towel and isopropyl alcohol. Examine all parts for deterioration, corrosion,
or damage.
Do not use soap, detergent, or solvents.
Repair the bleed-down valve:
• Every 1,000 hours
• If water leaks from the W
ASTE WATER OUT connection or from the weep holes while the pump is operating
Replace the bleed-down valve every 3,000 hours.
5/8-inch open-ended wrench
3/4-inch open-ended wrench
13/16-inch open-ended wrench
1-inch open-ended wrench
Phillips screwdriver
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