HALE AP, Technical Manual

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Figure 34. Typical Mechanical Seal Detail
Perform the following to remove and replace the pump seal.
Mechanical Seal Removal
A. Remove mechanical seal.
Pull spring off 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 shaft.
Remove stationary seat portion of mechanical seal from pump head. 3.
a) To remove stationary seat, without removing pump head perform the following.
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.
Mechanical Seal Installation
A MECHANICAL SEAL IS A PRECISION ENGINEERED DEVICE. CARE MUST BE TAKEN
NOT TO DAMAGE THE MATING FACES (SEAL FORMING PORTION) OF THE SEAL. EN-
SURE THE FACES REMAIN ABSOLUTELY CLEAN THROUGHOUT THE ENTIRE INSTALLA-