Hydrometers Operation and Maintenance Manual - Baseline Systems

Maintenance 3” and 4” Models
HYDROMETER DIS-ASSEMBLY AND RE-
ASSEMBLY
Dis-assembly of the 3” and 4” hydrometer is divided into the following
assemblies:
• Cover Assembly
• Diaphragm/Stem and Base Assemblies
• Inlet Spider/Strainer Assembly
Perform only those steps necessary to inspect and replace parts as directed
by the troubleshooting procedures. It is recommended to replace the
various
o-rings and gaskets during dis-assembly as well as to inspect certain
other parts. All gaskets and o-rings must be covered with grease prior to
installation.
HYDROMETER COVER AND BASE SUB-
ASSEMBLIES
Removal
• Remove the register subassembly as described on page 24.
• Loosen and remove the cover screws (10) along with the washers.
• Lift the cover off of the hydrometer body (29). Be especially careful
not to damage the impeller.
• Carefully remove the impeller assembly (37) from the hydrometer
body.
• Inspect the impeller and its components for signs of excessive wear
or damage. Verify that the impeller shaft is straight. Replace as
necessary.
• Inspect the base o-ring (42) for excessive wear or damage. Replace as
necessary.
Re-assembly
• Insert the impeller (37) into the inlet spider (located inside the
hydrometer base).
• Insert the base “O” ring (42) into the groove on the upper body flange.
• Carefully place the cover over the impeller shaft (37) and onto the
hydrometer body (29).
• Replace and tighten the cover screws (10).
• Replace the register subassembly as described on page 24.
Hydrometers Operation and Maintenance Manual • 29