SECTION 7
HIGH PRESSURE WATER
May 2003
p. 7-5
49831951
CAUTION
CAUTION
3. While lifting upward on the outlet HP check valve gland nut, push
upward on a stud nut, rotating the jug CW, while pushing inboard and
upward until thread engagement is accomplished. Continue to thread HP
cylinder into hydraulic cylinder head until hand tight.
4. Re-connect HP and LP piping / hoses per paragraph 7.2.1 above.
Check that all proximity switches are properly installed
and secured prior to starting the motor. Failure to tighten
proximity switch hold down screws (2 each per proximity
switch) will result in hydraulic oil spraying in general
directions.
5. Restart the pump, first operating in LOW pressure mode to flush out air
in HP components and also to check for obvious leaks. Switch to HIGH
pressure after 5-10 minutes of LOW pressure operation, watching for
obvious leaks. Be ready to shut off the pump if leaks appear. Remedy
leaks then repeat start procedure, moving from LOW pressure to HIGH
pressure soon after intensifier starts pumping water (no further need to
flush air from lines).
7.2.3 Stud Nuts and End Flange, Sealing Head—Disassembly / Re-
assembly
NOTE—KMT Waterjet recommends removing the HP cylinder/ sealing head/
flanges AS AN ASSEMBLY for servicing the plunger HP seals, plunger, hydraulic
seals, etc. KMT Waterjet DOES NOT recommend loosening stud nuts except to
service the sealing head inlet HP check valve, cone seat, etc. Refer to Table 7.1
for recommended disassembly / re-assembly practices.
End Flange and Sealing Head Removal
1. Prior to removing electrical power from the pump, extend plunger at
intensifier end to be serviced. Remove connector from proximity switch
on end of hydraulic cylinder closest to HP cylinder jug to be removed.
Start the pump in LOW pressure mode, allow approximately 20 seconds
for appropriate startup and cycling of intensifier to extend and stop
toward the disconnected proximity switch. Shut off the pump, shut off LP
water supply, observe LOCK-OUT/ TAG-OUT safety rules.
Before performing maintenance on the waterjet pump
observe electrical LOCK OUT/TAG OUT procedures.
2. Disconnect HP and LP piping / hoses per paragraph 7.2.1 above.
3. Loosen stud nuts, then remove nuts.
4. Remove end flange. Note that sealing head may be removed with end
flange.
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