Preventive maintenance
120 811390 Operator Manual DynaMAX 550P/560P/575P Waterjet Pump
Bleed-down valve
Refer to 1-17434 Bleed-down valve repair kit on page 140.
Repair the bleed-down valve:
• Every 1,000 hours
• If water leaks from the W
ASTE WATE R OUT connection or from the weep holes while the pump is operating
Replace the bleed-down valve every 3,000 hours.
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 155.
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.
1 Air fitting
2 Actuator
3 Needle bushing
4 Needle
5 High-pressure valve seal
6 Bleed-down valve body
7 Bleed-down valve poppet seat
8 Air-actuated bleed-down valve flow reducer
9 Outlet adapter
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