National Meter & Automation T200, Manual

Inspecting the Rotor and Bearings

To inspect the rotor, remove the nose cone assembly from the measuring element insert as described in 

"Removing the Magnet Carrier/Top Gear Set" on page 14

Check the rotor worm and blades for signs of damage and wear  Also inspect the bearing bushings in the front and rear shaft  

If damage or wear has occurred, replace the part (see 

Figure 12

)  If water deposits are found, remove any mineral deposits 

from the rotor blade surfaces, cage insert interior diameter, and nose cone vanes and mating surfaces 
Inspect the rotor bearing pins in the straightening vane and nose cone assembly for signs of damage and wear (see 

Figure 12

)  

The spherical end of the bearing pin must not show any drag lines and/or wear 

ROTOR

ROTOR 

WORM

BEARINGS (2)

NOSE CONE 

ASSEMBLY 

(2)

BEARING 

PIN

Figure 12:  Rotor and nose cone assembly (2", 3", 4" and 6" turbo head assemblies)

NOTE:

N

Only highly-polished bearing pin ends provide a minimum of friction and optimal meter performance  Bearing 

pins are an integral part of the straightening vane and nose cone assembly  Wear or damage would require the 

replacement of this component 

Reassembling the Rotor and Bearings

1   Install the rear nose cone to the cage  See 

"Removing the Magnet Carrier/Top Gear Set" on page 14

2   Place the rotor assembly with the worm gear side leading through the cage 
3   Place the rotor assembly on the rear rotor bearing pin, while tipping the assembly back so that the opening is up  See 

“Removing the Calibration Mechanism” on page 14

 for instructions on assembling the calibration rings with the nose 

cone assembly  

4   Insert the front nose cone assembly partially onto the cage insert, engaging the bearing pin with the front bearing of 

the rotor  

5   Tilt the measuring element insert assembly forth and back to see that the rotor now engages the bearing pins on the 

straightening vane/nose cones and is free to rotate and slide 

DO NOT FORCE THE NOSE CONE ASSEMBLY INTO THE CAGE INSERT. BE SURE THAT THE ROTOR ENGAGES BOTH THE 

FRONT AND REAR ROTOR BEARING PINS PRIOR TO PRESSING THE NOSE CONE ASSEMBLY FULLY INTO THE CAGE 

INSERT.

Servicing Parts and Assemblies

June 2016

RCS-UM-00076-EN-04

Page 16