HALE AP, Technical Manual

Page: 112 / 177

100
Measure impeller hub (see Table 23.), replace if out-of-tolerance. If the impeller has failed, per-
form MBP/RSD Impeller R&R (see paragraph 5.8.4.5). Always replace the mechanical seal, per-
form RSD Mechanical Seal R&R (see paragraph 5.8.4.10).
RSD Pump Head Installation
A. Prepare pump head for installation.
Place pump head on stable work surface, pump side up (see Figure 36). 1.
Install following items as described below.
a)
Verify mechanical seal anti rotation pin (see Figure 36) installed in pump head. If
NOT installed, perform Installation portion of RSD Mechanical Seal Pin R&R (see
paragraph 5.8.4.13.2).
b) Install pump head clearance ring (see Figure 36).
(Refer to paragraph 5.8.7.2 on page 110 for instructions).
c) Lubricate new Teflon O-ring (P/O mechanical seal system).
Refer to Table 21.
d) Install new Teflon O-ring (see Figure 36).
e) Lubricate new O-ring. Refer to Table 20.
f) Install new O-ring (volute to pump head) on pump side of pump head.
(See Figure 36.)
g) Apply a small amount of grease to new gasket. (The grease helps hold gasket in
place during assembly.)
h) Place new gasket on pump head (see Figure 36).
i) Align gasket and pump head screw holes.
Figure 37. Pump Head (Pump Side)
Flip pump head over, drive side up (see Figure 37). Install following items 2.
as described below.