Crane 104872, Installation And Operation Manual

12

F-2) Impeller and Volute Service:

F-2.1) Disassembly and Inspection:

To clean out volute (1) or replace impeller (33), disconnect 

power, remove hex bolts (26), and lockwashers (12), 

vertically lift motor and seal plate assembly from volute 

(1) see Figure 5. Clean out body if necessary. Clean and 

examine impeller (33), for pitting or wear and replace if 

required, inspect gasket (36) and replace if cut or damaged. 

If the impeller (33) needs replacing, place a flat screwdriver 

in the slot of the end of the shaft to hold the shaft stationary 

while unscrewing the jam nut (66) and impeller (33).

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. Apply thread locking compound 

(60) to shaft threads. Then install jam nut (66) and torque to 

40 ft. lbs.

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. Position gasket (36) on volute flange and position 

impeller and motor housing on volute (1). 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 Figure 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 5

FIGURE 6 - DOUBLE SEAL

FIGURE 6 - SINGLE SEAL

FIGURE 7