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Disassembly and reassembly
5. Install the bearing end cover (109) and gasket (360) and tighten bearing cap bolts (370N)
6. Refer to lubrication instructions in
7. Replace coupling hub (233) and key (400).
M, L, X, and Y frames
1. Clean the frame (228A) and bearing end cover (109) and install the oil seals (332A, S33D)
2. The M, L, X, and Y frames use a single deep groove radial bearing and either one (M
3. Thread the bearing locknut (136) on the stub shaft (380) and tighten firmly.
4. Place wave washer (524) in bottom of bearing frame (228A).
5. After lightly oiling the bearing frame bore and bearing outer races, install the stub shaft
6. Install the bearing end cover (109A) and gasket (360) and tighten the bearing cap bolts
7. Replace pump coupling hub (233) and key (400).
Reassembly of liquid end
1. Bolt seal housing (159) to bearing frame assembly.
2. Install O-rings (412L) on stationary seat mount (158). Lubricate O-rings well, and press seal
3. Install O-ring on stationary seat of mechanical seal (383B). Lubricate O-ring well and press
4. To install the drive collar (522) and split collet (524), slide the drive collar (522) over the
12
After lightly oiling the bearing housing bore and bearing outer races, install the stub shaft
assembly. This is a sliding fit; do not tap in place.
evenly. The bearing cap should be installed with the grease relief fitting (113) at the bottom.
with the lips in.
Frame) or two (L,X,Y, frames) angular contact thrust bearings. The radial bearing (168A)
has both outer race edges the same thickness. It is installed first on the stub shaft (380)
(farthest from the motor). A bearing spacer (443) is then installed on the stub shaft (380).
The single thrust bearing (112A) (M frame), or first of two thrust bearings (112A) (L, X, or Y
frames), should then be mounted. These should be installed so the thin edge of the outer
race points toward the radial bearing (168A) (toward the liquid end of the pump). For the L,
X, and Y frame; the second thrust bearing (112A) is installed in the same direction. Drive
inner race of bearing only.
assembly. This is a sliding fit; do not tap in place.
(370N) evenly. Insure that the mark "TOP" in the bearing cap is up.
seat mount into seal housing.
stationary seat into stationary seal mount (158).
shaft, past the long groove for the split collet (524), with the narrow end away from the
splined end of the shaft. Spread the split collet (524) with a suitable tool, slide it on to 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 collar (522) over the split collet (524) and using a piece
of pipe sized to seat against the narrow end of the drive collar (522), drive the drive collar
(522) with a hammer over th9 split collet (524) until movement of the drive collar (522)
stops. 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) split collet (524) are not positioned and
seated properly as shown, damage to the pump can occur when in operation.
Start-up
(page 6) to lubricate the bearings.
Model 3935 Installation, Operation and Maintenance Instructions
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