Baseline Systems BHM Series Hydrometer - Manual (Page 26)

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• Hydrometers Operation and Maintenance Manual
Maintenance 1½” and 2” Models
1½” and 2” Hydrometers
The dis-assembly of the hydrometer is divided into the following assemblies:
• Cover Assembly
• Diaphragm/Stem and Base Assemblies
• Inlet Spider/Strainer Assembly
Perform only those procedures 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 ASSEMBLIES
Removal
• Remove the register assembly as described on page 25.
• Loosen and remove the upper bearing bolt (8) using the specially
sized box wrench. Model number: 03640-000071
• Remove the upper bearing bolt o-ring (9) from the groove in the
underside of the bolt. Inspect and replace as necessary.
• Loosen and remove the six cover screws (10), with the washers.
• Lift the base and cover assemblies off of the hydrometer body (21).
• Be especially careful not to damage the impeller.
• Place the two assemblies upside down. Pull the impeller (30) up
and out.
• Some force may be required to free the impeller.
• Remove the magnet housing (31) from inside the cover assembly.
The magnet housing was freed from the impeller shaft during the
previous step.
• Inspect the impeller and its components for signs of excessive wear
or damage.
• Verify that the impeller shaft is straight. Replace as necessary.
Re-assembly
• Carefully place the base and cover assemblies over the impeller shaft
(30).
• Push the magnet housing (31) down over the top of the impeller shaft (which extends
through the hole in the cover). Tap the magnet housing with a hammer to ensure that it
is properly secured to
the shaft.
• Place the base and cover assemblies onto the hydrometer body (21).
• Replace and tighten the six cover screws (10).
• Place the upper bearing bolt o-ring (9) into the groove on the underside of the bolt (8).
• Screw in the upper bearing bolt “O” (8) using the specially sized
box wrench.
• Replace the register assembly and cover as described on page 25.