Preventive maintenance
104 811390 Operator Manual DynaMAX 550P/560P/575P Waterjet Pump
Parts, tools, and materials
1. Use a hex wrench to remove the socket-head cap screws and the lock washers from the
indicator pin cap.
2. Pull the indicator pin cap out of the hydraulic end cap.
3. If the O-ring backup and the O-ring are being replaced, remove them from the indicator pin cap.
4. Remove the spring from the indicator pin.
5. Remove the indicator pin from the indicator pin hole in the hydraulic end cap.
Repair the check valves and the low-pressure poppets
This procedure is for a moderately worn check valve. Replace very worn components.
Clean towels
Isopropyl alcohol
5/32-inch hex wrench
Repair the check valves every 500 hours.
Replace the low-pressure poppets every 1,000 hours.
Do not rock the part or use too much pressure. Doing so can cause damage to the part
face.
1 Check valve assembly 2 Low-pressure poppet
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