M & MA Series Meters
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Refer to the figures below and follow this procedure to reverse the meter registration:
1. Remove the dust cover. See the Removing the Dust Cover
procedure in Servicing the Drive Components .
2. Remove the retaining ring (4) with a screwdriver or pliers.
3. Remove the two retaining spring screws (1) with a
standard screwdriver.
4. Remove the retaining spring (2).
NOTE: For M-15®, M-25®, M-30®, and M-40® models,
loosen the single set screw.
5. Remove the drive shaft (3) with the adjuster drive gear
assembly including (4) Retaining Ring and (5) Adjuster
Drive Gear.
6. Remove the adjuster drive gear (5) and turn it 180° so that
it is upside down from the original installation position. The
bushing (7) supports the adjuster drive gear in the lower
position. The retaining ring (4)supports the adjuster drive
gear in the upper position.
7. Reassemble the parts in reverse order. Make sure that
the adjuster drive gear meshes with the packing gland’s
pinion gear (6) without being too tight. There should be a
little play in the gear teeth. The retaining ring (4) should be
placed in the groove provided on the drive shaft (3),
regardless of the adjuster drive gear position. The packing
gland pinion gear to adjuster drive gear ratio is either 1:1
or 2:1. In the 2:1 ratio, the pinion of the packing gland is
smaller in diameter.
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