SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-3
05114624
7.2.1 HP & LP Water Piping
Disconnect from/Reconnect to Waterjet Pump
Before performing maintenance on the waterjet pump
observe motor starter lock out/tag out procedures.
1. With 13/16” open wrench loosen and remove HP Piping attached to
discharge HP check valve. Move tubing to clear work area.
2. For servicing discharge HP check valve on the intensifier assembly, refer to
Section 7.3.1.”Discharge HP Check Valve”.
3. The sealing head can be removed with the discharge HP check valve
attached. Remove the low pressure water quick disconnect and gently pry
the collar off the sealing head.
4. With the HP piping and the low pressure cutting water plumbing
disconnected, the following operations can be performed:
• Sealing head can be removed from the HP cylinder
• HP cylinder can be removed from hydraulic cylinder head
• HP seals (sealing head and plunger) can be serviced
After the pump has been reassembled, then the HP water piping, quick
disconnect and collar are reinstalled as follows:
5. Slide inlet water collar over sealing head until it rests against the head nut.
Connect LP inlet water quick disconnect to collar.
6. Install the HP water piping. Tighten HP connections using a 13/16”
crowfoot wrench. Use a 30mm (1-3/16”) wrench for back-up on the sealing
head, and a 1” wrench for back-up on the elbow. Turn on cutting water
supply and check for low pressure leaks.
Check that all proximity switches are properly installed
prior to starting the motor.
7. Start the waterjet pump. Operate at low pressure (without a cutting orifice)
to flush the HP passages, then operate at high pressure to check for leaks.
ARNING
!
CAUTION
!
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