Issue/Rev. 0.0 (10/18)
MN01047
•
Page 9
Disassembly
To remove the Rotor and Blade Assembly, the 1/4"
NPT plug must be removed. Once the Plug is removed,
access to the Shaft Locking Screw is possible.
Remove the Hex-Bit Socket Screw (2" meter – M4; 3"
meter – M5). Once the screw is removed, the Rotor
and Blade Assembly can be removed from the Housing
(Figure 18 and Figure 19).
Alternate Method (for Smaller Meters)
With the Rotor installed in the Housing and the Spider
installed on the Rotor, rotate the element until the Blade is
fully extended. With the Blade held toward the Measuring
Chamber, check the clearance between the Blade Tip
and measuring chamber. Then push on the back side
of the Blade away from the Measuring Chamber and
recheck the clearance between the Blade Tip and Housing.
The difference between these clearances is the “Blade
Bearing to Cam Radius Difference”.
Blade Tip to Housing Clearance
The clearance needs to be checked on each Blade using
the spider. Rotate the Blade out towards the Measuring
Section and measure the clearance (Figure 17). Check
the clearance at the inlet, middle, and outlet of each Blade.
Average the three clearance measurements of each Blade
to achieve an overall clearance. Be sure to push on the
Blade to fully extract it towards the Measuring Chamber.
The clearance can be adjusted using the required Shim
behind the Measuring Chamber insert (Figure 31).
Figure 18 – NPT Removal
Figure 19 – Shaft Locking Screw Removal
Figure 17 – Blade Tip to Housing Clearance
Section III – Disassembly and Inspection (continued)
Figure 16 – Blade Bearing to Cam Clearance
Dial Indicator with Magnetic Base
Blade
Plug
Shaft Locking Screw
