11
F-4) Shaft Seal and Diaphragm Service:
Important! - Handle seal parts with extreme care.
DO NOT scratch or mar lapped surfaces.
F-4.1) Disassembly and Inspection:
Diaphragm -
To examine or replace the diaphragm (32) or
shaft seal (46), remove impeller (28) as outlined in paragraph
F-2.1. Drain oil from seal chamber as outlined in paragraph
F-1.2. Remove cap screws (6), lock washers (4), handle
(7), power cord (52) and sensor cord (53) from top on motor
housing (2). Set unit upside down. Remove socket head cap
screws (39) and lift seal plate (25) vertically, being cautious to
avoid seal damage, together with diaphragm (32), clamp (43)
and outboard stationary member (46A) of shaft seal (46), from
bearing bracket (21). Examine diaphragm (32), if it is ruptured,
cracked or damaged, replace by removing screws (44), lock
washers (9) and diaphragm clamp (43), Also, clean out vent
holes in seal plate (25). Check moisture sensor electrodes (18)
(if equipped) for damage. Replace by disconnecting wires (16)
by removing screws (14). Then remove electrodes (18) from
bearing bracket (21). Pipe plugs (31) replace sensor electrodes
(18) when pump is supplied without moisture sensors.
Seal -
To expose shaft seal (46) for examination, complete
above procedure and slide off outboard rotating member (46B).
See Figure 7. Remove inboard rotating member (46D), from
shaft. Examine all seal parts and especially contact faces.
Inspect seal for signs of wear such as uneven wear pattern on
stationary members, chips and scratches on either seal face.
DO NOT
interchange seal components, replace the entire
shaft seal (46).
F-4.2) Reassembly:
Diaphragm -
At reassembly, make sure the bulge and
molded-in part number of diaphragm (32) is facing the seal
plate (25). With diaphragm (32) in place, lay diaphragm clamp
(43) in place on seal plate (25) and insert the four cap screws
(44) and lock washers (9) and tighten. Apply pipe thread
compound to moisture sensor electrodes (18), if equipped
(or pipe plugs 31), and insert in bearing bracket (21). Attach
wires (16) with screws (14) to the moisture sensor electrodes
(18).
Seal -
Clean and oil seal cavities in bearing bracket (21) and
seal plate (25). Lightly oil
(DO NOT use grease)
outer surface
of inboard stationary member (46E) and outboard stationary
member (46A). Press inboard stationary member (46E) firmly
into bearing bracket (21) and outboard stationary (46A) into
seal plate (25), using a seal pusher (see parts list- seal tool kit),
nothing but the seal pusher is to come in contact with seal face
(See Figure 9).
Important ! - DO NOT hammer on the seal pusher-
it will damage the seal face.
Make sure the stationary members are in straight and that the
rubber ring is not out of it’s groove. Slide a bullet (see parts
list-Seal Kit) over motor shaft. Lightly oil (DO NOT use grease)
shaft, bullet and inner surface of bellows on rotating member
(46D) see Figure 8. With lapped surface facing bearing bracket
(21), slide rotating member (46D) over bullet and onto shaft,
using seal pusher, until lapped faces of (46D) and (46E) are
together (see Figure 8).
Stationary Member (46A) &
(46E) Polished Face Out
Seal Plate (25) and
Bearing Bracket (21)
Seal Pusher
FIGURE 9
FIGURE 7
FIGURE 8
Rotating Member (46D)
Bullet
Motor & Bearing Bracket
Seal Pusher
Stationary
FIGURE 10