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 4.1D
BALL BEARING REPLACEMENT
This section is presented as a guide to facilitate in-field replacement of the ball bearings in FT-8M turbine
flow transducers. The replacement kit includes the following parts: two (2) ball bearings and two (2) retaining
rings. For part numbers refer to page 6-2.
1.
Remove retainer ring (4) from either end of transducer housing.
2.
Gently slide transducer from the housing being careful not to drop cones or rotor.
3.
Remove downstream support (6) and cone (7) from shaft. Rotors are marked on the downstream hub
with 2 lines (See Figure 10).
4.
Gently slide rotor (10) from shaft.
5.
Remove retainer ring (8) from marked side of rotor and slide both bearings (9) from rotor.
6.
Install two new bearings into rotor being careful to face both bearings out.
7.
Install new retainer ring.
8.
Reverse Steps 1 thru 4 for reassembly.
-NOTE-
On FT-16M units, spacer (13) is removed in Step 3 and Step 6. Be
sure to re-install spacer between new bearings in Step 6.
FIGURE 10. ROTOR MARKING.
4-7
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