ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 868

B. Divide the end clearance by 3 and distribute approximately 1/3 on the gear end and the remaining 2/3 on
the drive end.
C. To move the impeller assembly toward the drive end, lightly tap the shaft at the gear end with a soft face
mallet.
D. To move the impeller assembly toward the gear end, lightly tap the shaft at the drive end with a soft face
mallet.
E. To set the fixed end, insert the feeler gauge in the amount specified in FIGURE 7-4, page 33, between the
headplate and the impeller at the gear end.
F. Tap lightly until the feeler gauge is snug. Adjust both impellers using the same procedure. Rotate the
impellers checking for clearance through a complete revolution.
Refer to FIGURE 7-1, page 31. The gear end bearings are held in position by the force created by the wavy
spring (J) on the drive end and the bearing retainer (K) on the gear end. This is referred to as the fixed end. The
interference fit between the shaft (H) and the bearing inner race (E) keeps the shaft from moving axially.
End clearance adjustment is by movement of the bearing retainer (K). Tightening the bearing retainer screws (M)
moves the bearing to load the wavy spring (J), and the impeller is forced toward the drive end. Relaxing the
screws allows the wavy spring to return the impeller toward the gear end.
A. Assemble drive cover to drive headplate. Refer to Step 15 with the exception of the use of wavy springs
(J) installed between the drive end bearings and the wavy spring retainer plates.
B. Back out retainer screws (M) until both impellers are tight against the gear headplate.
C. With feeler gauge, measure the clearance between each impeller and the drive headplate. This value is
the total end clearance.
D. Measure the clearance between the gear headplate and bearing retainer (K) at point (S).
E. Subtract 1/3 of the total end clearance from the clearance measured at point (S). This value is the
amount of shim (13) that should be placed between the retainer and the headplate at point (S).
F. Tighten the bearing retainer screws (M) to the torque value given in FIGURE 7-9, page 38. With the
retainer screws secure, approximately 1/3 of the total end clearance should be on the gear end and the
remaining 2/3 on the drive end.
E-125