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IOM BiRotor 3” to 6” R03
A. Measuring unit 203505-030 has two screws
and two washers (Items 16 & 17).
B. Measuring unit 213505-030 will require replac-
ing one screw (Item 10) on the 3T rotor and one
screw and one washer (items 16 & 17) on the 4T
rotor.
C. Measuring unit 223505-030 has two nuts (Item
42).
D. Measuring unit 233505-030 has two different
size screws. The 4T rotor has four screws (Item
17) and washers (Item 16). Place two screws and
washers opposite each other on the 3T rotor.
Now replace the two long screws (Item 47),
drive key (Item 46) and washers (Item 16). See
fi gure 4-15 for illustration.
11.8 Setting End Clearance (Refer to
Figure 4-3)
Models B101 - B135
The following procedure is applicable if clearance be-
tween the rotors and end plate requires adjustment.
1. Loosen set screws (Item 15) in the bearing retainer
and tighten screws or nuts (Items 10, 17, 42 or 47),
pulling the rotors against the front end plate (Item
3).
NOTE:
Refer to correct measuring unit assembly
for the correct nut or screw.
2. Determine the clearance between the rotors and
rear end cover (Item 3) with a feeler gauge. For
example, .0008.
3. With timing gear jam nuts (Item 3) tight, tighten
set screws (Item 37) in each timing gear unit until
a clearance of .0004 is obtained between each
rotor and rear end plate. (See Figure 4-4).
NOTE:
The set screws on the 133505-030
measuring unit will be Item 15.
4. With bearing retainer screws or nuts (Items 10,
17, 42 or 47) tight, tighten the set screws in the
retainers to obtain a clearance of .0004 between
each rotor and end plate.
NOTE:
Measuring unit 113505-030 will have one
retainer and one drive adaptor.
NOTE:
Bend two tabs of lock washer (Item 31)
against side of jam nut (Item 30) to secure jam
nut.
Models B201 - B235
1. Adjust the two set screws located on each of the
drive gears (Items 20 and 28) until both rotors
(items 1 and 21) are fl ush with the backside of the
rear end plate (Item 3).
2. Insert a shim into the outlet port located on the
front end plate (Item 3) and determine the total
distance between the backside of the front end
plate and the 3T rotor (Item 1). Repeat this proce-
dure for the 4T rotor (Item 21).
3. Adjust the two set screws located on the small
drive gear (Item 20) until the distance between
the backside of the front end plate (Item 3) and
the 3T rotor is half of the total distance deter-
mined. Repeat this procedure for the large drive
gear (Item 28) and the 4T rotor (Item 21).
4. If end clearance is adjusted properly, rotors will
spin freely with the meter in any position. 1f rotors
fail to spin freely, repeat procedure for setting end
clearance.