Baseline-systems BHM Series Hydrometer Manuale Utente Pagina 37

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Hydrometers Operation and Maintenance Manual37
Maintenance 8” Model, Cont.
STEM SUB-ASSEMBLY AND VALVE COVER
Follow this procedure only if it is necessary to replace the stem
bearings or the valve cover. Otherwise, skip this section:
Dis-assembly and Re-assembly
Inspect the upper stem bearing wiper (36). Replace as necessary.
Remove the upper stem bearing (37) from the stem (41).
Inspect the upper stem bearing o-rings (38,39). Replace as
necessary.
Unscrew and remove the stem locking nut (48), located at the
bottom of the stem subassembly.
Remove the valve cover (47) from the stem. Inspect the rubber for
cracks and excessive wear. Replace as necessary.
Inspect the valve cover o-ring (43) and replace as necessary.
Remove the retaining ring (46) that holds the lower stem bearing
wiper (45) in place. Inspect the lower stem bearing wiper (45) and
replace as necessary.
Inspect the lower stem bearing o-ring (44) and replace as
necessary.
Inspect the lower stem bearing (42) for scratches or wear. Replace
as necessary.
Apply Loctite 270 or similar glue to the threads of the lower stem
bearing and screw it into the stem assembly (41).
Replace the valve cover (47) onto the stem assembly.
Apply Loctite 270 or similar glue to the threads of the stem
locking nut (48) and screw into the stem assembly.
Push the upper stem bearing (37) onto the stem assembly.
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