Maintenance of Orifice Meters
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With the differential pen-arm bracket between the thumb and finger of the left hand, hold a lighted match or hot soldering iron against the end of the flexible coupling, part No. 11943 or 9990.
Pull the shaft through the bearing from the front. From the back of the instrument: Remove the bearing by means of a special socket wrench which may he procured from the meter manufacturer,
To Remove the Entire Differential Chamber from the Cue From the front of the instrument : Remove the chart disc.
Remove the pen arms and brackets as noted in the previous paragraph. Take out the three cap screws, part No. 5948.
Check Valve As explained in a previous paragraph the check valves are each ground to their respective seats and are not interchangeable, therefore, if new check floats are required, the entire assembly, part No. 12139, should he ordered.
Differential Float Assembled If the ball joint between the float stern and extension arm is damaged, an entirely new assembly part No. 7642 should be used, as it is difficult to replace the ball joint without the proper equipment.
To Replace Static Tube in Type C Instrument Refer to page 23 under construction of Differential and Static Recording Gauge.
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