6 • MN02004
Issue/Rev. 0.3 (8/02)
Section 2 – Service (continued)
Note:
It will be necessary to remove one deflector ring
when servicing a bidirectional turbine meter.
Figure 13
Figure 14
Reassembly of lnternals
1. Inspect to make certain all parts are clean and free
from defects, especially replacement parts. Make
sure the rotor bearing is properly aligned in the
rotor (equal amounts of the bearing should be
on each side of the rotor).
2. Place upstream stator on shaft and install shaft
nut. Note. Before installing the nut on the shaft,
the mating surfaces of the nut, the stator, and
the threads of the shaft should be cleaned and
lubricated with SAE grade 30 oil (or equivalent).
The shaft nut should be properly tightened and
secured with the cotter pin. See Table 1 for proper
torque values.
Table 1
– Shaft Nut Torque Values
Meter Sizes Thread Size
Torque Required
(Lubricated) ±5%
4"
#10-32 UNF-2
22 in-lb
6", 8"
5/6"-18 UNC-2
8 ft-lb
10", 12"
1/2"-13 UNC-2
32 ft-lb
16"
3/4"-16 UNF-2
120 ft-lb
18"
7/8"-14 UNF-2
115 ft-lb
20"
1"-12 UNF-2
170 ft-lb
24"
1-1/4"-12 UNF-2
250 ft-lb
3. Apply blueing or similar compound to downstream
side of rotor hub that matches O.D. of stator,
Figure 15.
Rotor is marked “IN” on upstream
side of rotor.
4. Slip platform bearing on shaft with approximately
1/4" of shaft showing. Lubricate O.D. of platform
bearing with light machine oil.
5. Assemble rotor to platform bearing and gently
push bearing and rotor into housing until
positioned by stator. Do not bump bearing ends
against stator.
In a bidirectional turbine meter, reinsert
deflector ring. Carefully relocate the ring in
its exact former position and insert the set
screws, but do not over tighten them because
this could cause distortion of the deflector ring.
Figure 15
6. Assemble downstream stator. In a unidirectional
turbine meter, the stator is positioned with the
Woodruff key, Figure 16. In a bidirectional turbine
meter, the stator is positioned with the deflector
ring. Assemble shaft nut; refer to Step 2.
