Viking Pump TSM151.2: LS-M 123/4123 - Manual (Page 12)

SECTION TSM 151.2 ISSUE B PAGE 12 OF 14
THRUST BEARING ADJUSTMENT
Refer to FIGURE 12.
1. Loosen two setscrews over each outer and inner end
caps.
2. Turn inner end cap clockwise (viewed from shaft end)
until it projects slightly into opening on side of bracket
exposing approximately three threads.
3. Turn outer end cap clockwise until rotor is tight against
head and rotor shaft cannot be turned.
4. Make reference mark on bracket end, opposite notch on
outer end cap. Back off outer end cap required number
of notches as shown in Total End Clearance Chart.
Refer to Figure 11. Each notch represents .002” end
clearance.
5. High viscosity liquids require additional end clearances.
The amount of extra end clearance depends on
viscosity of liquid pumped. For specific
recommendations consult factory.
6. Tighten inner end cap with a spanner wrench. Tap
spanner wrench lightly but DO NOT OVER-TIGHTEN,
as it will damage threads.
7. Tighten setscrews that hold inner and outer end caps to
prevent their turning in bracket.
8. Check rotor to determine if it turns freely; if it does not,
add more end clearances.
FIGURE 11
TOTAL END CLEARANCE CHART
PUMP SIZE TURN OUTER END CAP
COUNTER-CLOCKWISE NO.
OF NOTCHES
TOTAL
END
CLEARANCE
LS 2.5 0.005
Q, QS AND M 5 0.01
FIGURE 12
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 in
installation. The additional precautions listed below must be
followed for proper installation.
1. A press must be used for installation.
2. Be certain bushing is started straight.
3. Do not stop pressing operation until bushing is in proper
position, starting and stopping will result in a cracked
bushing.
4. Check 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 bracket 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 bushing.
Consult factory with specific questions on high temperature
applications. Refer to Engineering Service Bulletin ESB –3.
GREASE FITTING LOCATION
SETSCREWS
OUTER END CAP
LOCKWASHER
LOCKNUT
OUTER SPACER
COLLAR
OUTER LIP
SEAL
BRACKET BALL BEARING
INNER LIP
SEAL
INNER
SPACER
COLLAR
HALF ROUND
RINGS
INNER
END CAP
NYLON INSERT