HALE AP, Technical Manual

Page: 106 / 177

94
Pull spring off of pump shaft. 1.
Remove diaphragm assembly. 2.
a) Place two small screwdrivers (or two hook-type tools) between diaphragm assem-
bly and stationary seat. Note: Place tools 180° apart.
b) Using steady, gentle pressure, pry diaphragm off of shaft.
Remove stationary seat portion of mechanical seal from pump head. 3.
a) To remove stationary seat, without removing pump head perform the following.
NOTES
The mechanical seals stationary seat has a notch (see Figure 34) that fits over a roll
pin (prevents the seat from spinning under extreme conditions). This provides a good
place to catch the seat.
Figure 35. RSD Mechanical Seal Notch
b) Slide short end of a 3/32-in or 7/64-in (or 2.5 / 3.0 mm) hex key (Allen wrench)
between back side of pump head and pump shaft.
c) Using steady, gentle pressure pry on hex key with a screwdriver (twist the screw-
driver) to push stationary seat out of the pump head.
NOTES
Removing the mechanical seal renders it inoperative and it must be replaced with a
new never installed seal.
Never reuse a mechanical seal that has been previously installed and removed.
Do NOT replace only the moving portion of a seal; ALWAYS replace the entire seal.
B. Inspect and clean all components. See paragraph 5.7.7, Cleaning And In-
spection Guidelines.
Inspect oil seal on gearbox side of pump head. 1.
Inspect roll pin. 2.
a) Inspect roll pin for corrosion or damage.
b) Measure roll pin height (3/32 ± 25/1000-in).
c) Replace roll pin ONLY if required.