Section 8
High Pressure Water System
20425618
5-2005/Rev 0
8-14
NOTE
The high pressure cylinders are manufactured with an inner and an outer cylinder.
The inner cylinder has a spiral groove cut into it and is press-fit inside the outer
cylinder. This manufacturing process increases the fatigue strength and extends
the life of the cylinder.
The ends of the high pressure cylinder often show a ‘step’ where the inner sleeve
extends slightly beyond the outer sleeve, and the spiral groove could appear to be a
crack on either end of the cylinder. These characteristics are normal and do not
indicate a flaw in the cylinder.
8.8 Hard Seal End Caps
KMT Waterjet recommends loosening the jackbolts and removing the hard seal end caps (HSEC)
only to service the inlet check valve and the cone seat on the sealing head.
Hard Seal End Cap Removal
Prior to removing electrical power or any high or low pressure piping, start the machine and
retract the plunger on the opposite end to be serviced to allow full exposure when the unit is
disassembled.
1. Turn the machine off and observe the appropriate Lockout/Tagout procedures.
Severe injury can result if the machine is not properly locked out. Observe
electrical Lockout/Tagout procedures before proceeding.
Ensure all pressure is relieved or blocked from the hydraulic and high pressure
circuits before proceeding.
2. Disconnect the high and low pressure water piping, following the procedure, High and
Low Pressure Water Piping.
3. Loosen the jackbolts in the hard seal end cap.
4. Unscrew and remove the HSEC from the high pressure cylinder.
5. Remove the sealing head. The sealing head may be removed with the HSEC or after the
end cap has been removed.
6. Verify the removal of the white plastic seal spacer used to position the sealing head
relative to the high pressure cylinder. The spacer may come out with the sealing head. If
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