Seals
Check the seals (332 and 333) for wear, cracks, cuts, deformities, and signs of excessive leakage.
Check the thrust-bearing end cover (109A) for signs of leakage and damage. Check the grease fittings
(113) or oil breathers (113A) (oil option) for serviceability and replace as required.
General
NOTICE:
Protect machined surfaces while cleaning the parts. Failure to do so may result in equipment
damage.
Clean all parts before reassembly. This is especially important at O-ring grooves, gasket surfaces, mat-
ing surfaces, and bearing areas. Check that threads on dowels, screws, nuts, studs, and all gasket surfa-
ces are in good condition. Make sure the anti-rotation pins (445A) are firmly pressed into the wear rings
(103).
Refer to
6.3 Bearing maintenance on page 55
for specific instructions on cleaning bearings.
6.6.1 Replace impeller wear rings
1.
Remove the old rings:
a) Remove the three setscrews (320).
b) Pull the ring (142) off the impeller hub.
2.
Clean the hub and press on a new ring (142).
3.
Drill and tap three holes 120° (1,600 mils) apart with a 7/32-in. drill and a 1/4-in. 20NC tap on each
ring.
4.
Insert the setscrews.
Make sure to use 5/16 in. x 1/4 in. cup point safety setscrews.
5.
Tighten the screws and lightly upset the threads. Do not use the existing holes.
6.6.2 Radial clearances
Radial clearance between the impeller and casing wear rings
1
2
3
1.
Casing wear ring
2.
Radial clearance
3.
Impeller
6.6 Preassembly inspections
Model 3410 Installation, Operation, and Maintenance Manual
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