Preventive maintenance
DynaMAX 550P/560P/575P Waterjet Pump Operator Manual 811390 101
Remove the high-pressure cylinder assembly and the check valve assemblies
Parts, tools, and materials
1. Remove the high-pressure cylinder and the check valve from the plunger.
2. Remove the check valve by rolling the cylinder and tapping the check valve with a rubber mallet.
Tap at an angle away from the cylinder.
3. Tilt the cylinder so that the low-pressure poppet comes out.
4. Put the cylinder on the seal-locating ring.
5. Put the stepped end of the push tool against the seal and tap on the end of the push tool with a
rubber mallet to push the bottom seal and the hoop out of the high-pressure cylinder.
6. Turn the cylinder over and put it on the locating ring.
7. Prevent the spacer tube from sliding out when the cylinder is turned over.
Replace the check valves every 2,000 hours.
Replace the high-pressure cylinder assemblies:
• every 3,000 hours
• if the cylinder is chipped or cracked
1 Check valve assembly
2 High-pressure hoop
3 High-pressure water seal
4 Low-pressure poppet
5 Low-pressure poppet basket
6 Spacer tube
7 High-pressure cylinder
Clean towels
Isopropyl alcohol
Seal installation tools
Rubber mallet
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