Issue/Rev. 0.6 (12/18) ║ MN01005 • Page 11
5. If, at this time, the rotor turns freely, the meter may now be reassembled and tested to see if
the calibration problem has been corrected.
6. If the rotor cannot be adjusted properly, the mechanism will have to be disassembled and the
necessary corrective steps taken. A properly cleaned and adjusted meter can be turned by
hand with a slow, even torque applied to the jackshaft coupling. Do not use pliers to turn
coupling.
2.9.
Models H8 and JA10 Meter Adjustment
These two meters differ from the smaller sizes in that the rotor assemblies are suspended rather
than supported by the spring. Thus, the procedure for adjusting rotor end clearance is reverse
(CCW to bottom, CW to raise) of the smaller sizes.
Clearances should be checked through the inlet and outlet ports using feeler gauges to position
the rotor 1/3 down from the cover.
In the H8, the adjusting mechanism consists of a long cap screw, which extends down through
the center of the rotor shaft, and threaded into the adjusting bar which moves the adjusting col
-
lar. To prevent movement after the rotor is adjusted, a locking plate is used over the head of the
adjusting cap screw.
In the JA10, both the top and bottom of the adjusting rod are threaded. The bottom portion is
screwed into the adjusting bar and pinned in place to prevent movement and a nut and lock nut
are used on the opposite end to accomplish the adjustment and locking.
2-Bladed Double Case PD Meters Service Manual
Disassembly
Figure 13 –
JA10
