SECTION 7
HIGH PRESSURE WATER
May 2003
p. 7-6
49831951
CAUTION
5. Remove sealing head. Note that a white plastic ring used to position the
sealing head relative to the HP cylinder bore may not have been removed
with the sealing head. This ring should be removed prior to re-installing
a sealing head to avoid pushing the ring further into the HP cylinder
bore. Note that a fully- assembled spare sealing head greatly reduces
pump downtime.
Re-Assemble Sealing Head and End Flange to HP Cylinder
1. Verify that sealing head cone surface is smooth. Perform any necessary
maintenance on inlet check valve. (Refer to paragraph 7.3.2) Verify that
a white plastic alignment ring is installed on the ‘nose’ of the sealing
head. Verify O-rings (2 ea) properly installed in ID grooves of end flange.
Check HP cylinder bore to verify presence of plastic tubular cylinder liner
and to verify that no white plastic alignment ring remains in end of HP
cylinder bore. Feel sealing edge of HP cylinder bore to verify that no
unusual blemishes are present that might hinder proper cone ring seal.
2. Install sealing head into end flange. Install sealing head and end flange
over stud bolts and into cylinder bore. Note that end flange should be
oriented with the LP water fitting oriented near the 9 o’clock or 3 o’clock
positions for ease of making the LP water connection.
3. Thread nuts onto studs to hand-tightness. Apply molygrease to stud
threads (Table 7-2 item 3). Verify end flange and ring flange are parallel
to within 0.070-inch.
4. Tighten stud nuts (using a torque wrench) in a crossing pattern in
several stages to reach maximum torque. See Table 7.1 for suggested nut
tightening sequence. Verify flange parallelism at completion of tightening
sequence.
5. Re-connect HP and LP piping / hoses per paragraph 7.2.1 above.
Verify that proximity switches (2 ea) are properly installed
Failure to tighten proximity switch hold down screws will
result in hydraulic oil spraying in general directions.
6. 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).
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