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IOM BiRotor 3” to 6” R03
11.9 Timing Gear Adjustment (refer to
Figure 4-2)
Models B101 - B135
1. Loosen the jam nut (Item 30) on the large timing
gear (Item 28) and with feeler gauge or shims,
carefully centralize a lobe of the three tooth rotor
in a fl ute of the four tooth rotor. This may be done
through the inlet and outlet openings of the unit.
2. Using a small piece of rubber between the tim-
ing gears, tighten the jam nut, remove shims and
check for freeness of operation.
3. If the rotors contact one another, the timing oper-
ation must be repeated.
4. If the rotors were damaged, it will sometimes be
found that all of the high spots were not removed.
In such cases, it is necessary to fi nd these spots
and remove them.
Models B201 - B235
1. Loosen the jam nut (item 30) on the large timing
gear (Item 28) and, with feeler gauge or shims,
carefully centralize the lobe of the 3T rotor in a
fl ute of the 4T rotor.
2. Determine the total distance between the lobe
and fl ute of the two rotors. Set the rotor clearance
to one half of the total distance using the appro-
priate shim.
NOTE:
This may be done through the inlet and outlet
openings of the unit.
3. Using a piece of rubber between the timing gears,
tighten the jam nut (Item 30), remove shim and
check for freeness of operation. If the rotors
contact one another, the timing operation must be
repeated.
4. If the rotors were damaged, it will sometimes be
found that all of the high spots were not removed.
In such cases, it is necessary to fi nd these spots
and remove them.
5. When rotor timing is completed, bend two tabs of
lockwasher (Item 31) against side of jam nut (Item
30). This will secure the jam nut.
11.10 Completion of Measuring Unit
Reassembly and Installing into Meter
(refer to Figures 6-1 - 6-5)
Models B101 - B135
1. Replace gear box assembly (Item 5).
NOTE:
Roll pin on gear box assembly (Item 5) must
engage with coupling jaw (Item 40) or the drive
key (Item 46).
2. Replace front bearing caps (Item 6), washers (Item
38) and screws (Item 8). The 113505- 030 and
133505-030 measuring units use screws (Figure
6-3, Item 35) on the four tooth rotor gearing cap.
3. Connect the measuring unit (Figure 6-1, Item 23)
to the end cover (Item 1) with socket head screws
(Item 24).
4. Replace meter housing (Item 4) and O-ring (Item
5).
NOTE:
A light fi lm of grease will aid in holding O-ring in
place.
5. Rotate the coupling tube on the pinion shaft as-
sembly of the counter base plate assembly (Item
6) until the drive pin is positioned the same as the
slot of the coupling jaw on the gear box assembly.
6. Reinstall
other accessories.
Models B201 - B235
Measuring unit 213505-030 and 233505-030, refer to
Figures 6-4 and 6-6.
1. Replace top gear cover (Item 25), secure with
screws (Item 29).
2. Replace gear box assembly (Item 5) gasket (Item 7
and 55) and front bearing cap (Item 6)