Viking Pump TSM143: N-P 335/4335 - Manual (Page 13)

SECTION TSM 143 ISSUE E PAGE 13 OF 15
3. Place the tapered installation sleeve (if on hand) and
install the seal on the shaft over tthe apered sleeve.
Position the seal on the shaft inside the rotor bearing
sleeve bore with end of seal located .19 inch inside
the machined face of the rotor bearing sleeve. Refer to
Figure 18 .
4. Tighten all the seal drive set screws securely to the
shaft.
5. Remove the tapered installation sleeve.
6. Place the gasket on the packing box extension and
install the extension with the machined pilot inside the
rotor bearing sleeve bore.
7. Place the seat gasket over the shoulder of the stationary
seal seat and insert seat into the seal plate. Place the
remaining seat gasket over shoulder of polished surface
of stationary seat. Refer to Figure 18.
8. Place the seal plate with the stationary seat over the
mounting the studs and push the shoulder of stationary
seat into the packing box extension, the polished face
against the carbon rotating face.
9. Install the nuts on mounting studs and against seal
holder. Tighten the nuts evenly so the seal plate
and stationary seat will not be distorted when seal is
compressed.
10. Reassemble flush line to packing box extension.
AT ThIS POINT, fINISh ASSEMbly PROCEDURES
STARTING AT STEP 18, page 10.
ThRUST bEARING ADJUSTMENT
Loosen the capscrews retaining the end cap locks on both
the inner and outer end caps. Slide the end cap locks out
far enough so the pins are no longer in the end cap retaining
holes. Using the spanner wrench provided with the pump,
turn the inner end cap towards the pump. Turn the outer
end cap in until the rotor shaft cannot be turned. With grease
pencil or chalk, make a reference mark on the bearing
housing OD and outer end cap. Back off the outer end cap
approximately 4 holes. One hole is equivalent to .005 inch
end clearance. Align the nearest end cap hole with the outer
end cap lock. Tighten the setscrew holding this lock. Tighten
the inner end cap until it is snug. Do not over tighten. Back
off slightly to align the nearest end cap hole with the end cap
lock. Tighten this setscrew. It is important not to tighten the
inner end cap to make the end cap lock align. This will cause
the tapered roller bearings to run too tightly and heat up.
Turn the rotor shaft to make sure it turns freely. If not, repeat
the above procedure.
Standard catalog pumps require the following end clearance
settings.
Pump Size Standard End Clearance (Inch)
N .015
R .020
P .025
Pumps built for viscous liquid or high temperature service
may require extra end clearance. Each hole on the end
cap is about .004 inch additional end clearance. Consult
an authorized Viking distributor or the factory for further
information.
INSTAllATION Of CARbON
GRAPhITE bUShINGS
When installing carbon graphite bushings, extreme care
must be taken to prevent breaking. Carbon graphite is a
brittle material and easily cracked. If cracked, the bushing will
quickly disintegrate. Using a lubricant and adding a chamfer
on the bushing and the mating part will help with installation.
The additional precautions listed below must be followed for
proper installation.
1. A press must be used for installation.
2. Be certain the bushing is started straight.
3. Do not stop the pressing operation until the bushing is in
the proper position; starting and stopping will result in a
cracked bushing.
4. Check the bushing for cracks after installation.
Carbon graphite bushings with extra interference fits are
frequently furnished for high temperature operation. These
bushings must be installed by a shrink fit.
1. Heat the rotor bearing sleeve or idler to 750º F.
2. Install cool bushings with a press.
3. If facilities are not available to reach 750º F. temperature,
it is possible to install with 450º F. temperature; however,
the lower the temperature, the greater the possibility of
cracking the bushing.
Consult factory with specific questions on high temperature
applications. Refer to Engineering Service Bulletin ESB-3.