Issue/Rev. 0.6 (12/18) ║ MN01005 • Page 23
3. Care must be taken when installing the inner unit cover to assure that the rotor gear and the
lower jackshaft gear are properly meshed.
• The fit of the inner unit cover is normally close enough to necessitate tapping the cover
with a soft hammer to drive it into place on the inner unit. At the same time, rotate the
rotor adjusting screw.
4. Total end clearances (see Clearance Guide Table) is divided, top and bottom, by setting the
rotor adjusting screw.
• Loosen the adjusting screw locknut and while turning the rotor, Figure 30, slowly raise
the rotor assembly until it just begins to bind against the top cover.
• With the rotor in this position, check the bottom rotor clearances at both the inlet and
outlet ports, compare with Clearance Guide.
• By means of the adjusting screw, lower the rotor until 1/3 of this clearance is at the tip
and 2/3 is at the bottom.
•
Add .002" - .004" to the top clearances to allow for the tightening of the lock nut.
• Tighten adjusting shaft lock nut and check top and bottom rotor clearances to see that
they are 1/3 off the top and 2/3 off the bottom.
• If these clearances do not check, loosen lock nut and repeat the complete adjusting
procedure.
• After this adjustment has been satisfactorily completed, and lock nut tightened, record
these measurements as “as assembled” clearances.
2-Bladed Double Case PD Meters Service Manual
Reassembly and Clearance Checks
Figure 29
– Filing Edge of Blade Using Vice
with Jaw Inserts to Protect Blades
Figure 30
