2.
Shaft (122) Check shaft for runout to be sure it is not bent. Bearing seats, retaining ring grooves,
Keyways, surfaces under oil seals, and surface under mechanical seal should be in good condition.
3.
Mechanical Seal (383) Replace if faces are worn, scarred, or cracked, or if elastomeric bellows is
damaged.
4.
Backwashers (546) - Inspect and replace if worn. The backwashers (546) are nominal .030"
(0.8mm) thick, replace if worn to less than .020" (0.5mm).
5.
Intermediate and discharge head bearings - Check for excessive wear in carbon bushings. Replace
as necessary.
6.
Oil seal (332A) & (3330) - Replace if worn or damaged.
7.
Diffusers (l50) - Male and female lock fits should be checked for foreign materials or damage.
8.
General - All parts should be clean and free of burrs before assembly. This is especially important at
O-ring grooves, threads, bearing areas and diffuser locks.
7.3 Reassembly of power end
1.
Clean the frame (228A), and bearing end covers (109A) and (109C). Press in new oil seals (332A)
and (333D) with the lips facing in.
2.
The H frame uses a single deep groove radial bearing and two angular contact thrust bearings. The
radial bearing (168A) has both outer race edges the same thickness. Press radial bearing (168A) on
from splined end of shaft. The thrust bearings (112A) are installed in tandem with the thin edge of
the outer races facing the radial bearing (168A). Press the thrust bearings on individually. Press on
inner races only.
3.
Install bearing lock washer (382). Thread bearing locknut (136) on stub shaft (380) and tighten firm-
ly. Set bearing lock washer (382) tang in groove in bearing locknut (136).
4.
Install bearing end cover (109C) with gasket (360) and tighten cap bolt (370N) evenly. Ensure word
"TOP" in end cover is up.
5.
Place wave washer (529) in bottom of bearing frame (228A) against bearing end cover (109C).
6.
After lightly oiling the bearing frame bore and bearing outer races, install the stub shaft assembly.
This is a sliding fit: Do not tap.
7.
Install bearing end cover (109A) and gasket (360). Tighten cap screws evenly. Ensure word "TOP"
on end cover is up.
8.
Replace pump coupling hub (233) and key (400).
7.4 Reassembly of liquid end
1.
Install O-ring (412L) on stationary seat mount (158) and install seal mount (158) into end cover
(109C).
2.
Install O-ring on stationary seat of mechanical seal (383B). Lubricate O-ring well. Press stationary
seat into seal mount (158).
3.
To install the drive collar (522) and split collet (524) slide the drive collar (522) over the shaft, past
the long groove for the split collet (524), with the arrow end away from the splined end of the shaft.
Spread the split collet (524) with a suitable tool, slide it onto the shaft with the narrow end away
from the splined end of the shaft. Seat the split collet (524) into the long groove. Push the drive col-
lar (522) over the split collet (524). Drive the collar over the split collet firmly until movement stops.
Do not mar or damage face of collar. The split collet (524) must still be in the groove, butted against
the edge closest to the splined end of the shaft. If the drive collar (522) and split collet (524) are not
positioned and seated properly as shown in Figure 5, damage to the pump will occur in operation.
4.
Install mechanical seal retaining ring (361D) on shaft (122) in groove near splined end.
7.3 Reassembly of power end
14
3335 Installation, Operation and Maintenance Instructions
