11
FIGURE 6
F-2.2) Reassembly:
To install impeller (33), clean the threads with thread
locking compound cleaner. Apply removable Loctite® 603
or equivalent to shaft threads. Screw impeller onto the shaft
hand tight while using a screwdriver in the slot at the end of
the shaft to hold it stationary. It is important that the spring of
the lower shaft seal (28) seats in the hub of the impeller (33).
Rotate impeller to check for binding. Install U-cup (57) by first
applying adhesive to bore of volute (1). Be sure not to get
adhesive on inside diameter of U-cup (57). Position gasket
(36) on volute flange and position impeller and motor housing
on volute (1).
CAUTION: When assembling volute (1)
to rest of the pump be sure the inside lip of the
U-cup (57) is not pushed out of place (see Figure
5).
Position lockwasher (12) on cap screw (26) and screw
into volute (1). Torque to 100 in-lbs. Check for free rotation of
motor and impeller.
F-3) Shaft Seal Service:
CAUTION ! - Handle seal parts with extreme care.
DO NOT scratch or mar lapped surfaces.
F-3.1) Disassembly and Inspection:
Outer Seal (All Units) -
To expose shaft seal (28) for
examination, disassemble volute and impeller as outlined in
paragraph F-2.1. If further repair is required, remove retaining
ring (28d), spring (28c) and rotating member (28b) from shaft
(see Figures 6 & 7). 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 (28). If replacing seal, remove
stationary (28a) by prying out with flat screwdriver.
Inner Seal (DS Units Only) -
To expose inner shaft seal
(28) for examination, remove outer seal as outlined above.
Remove socket head cap screws (64). Lift outer seal plate
(29) and square-ring (27) from inner seal plate (5), see
Figure 8. If further repair is required, remove snap ring (32),
retaining ring (28d), spring (28c) and rotating member (28b)
from shaft. Examine as outlined in outer seal paragraph. If
replacing seal, remove stationary (28a) by prying out with flat
screwdriver.
FIGURE 7 - DOUBLE SEAL
FIGURE 7 - SINGLE SEAL
FIGURE 8
Summary of Contents for BARNES STEP-DS Series
Page 15: ...15 FIGURE 16 CONTIUED ...
Page 17: ...17 FIGURE 17 STEP SS Single Seal ...
Page 18: ...18 FIGURE 18 STEP SS Single Seal ...
Page 19: ...19 FIGURE 19 STEP DS Double Seal ...
Page 20: ...20 FIGURE 20 STEP DS Double Seal ...
Page 23: ...23 Notes ...
Page 24: ...24 Notes ...
