Viking Pump TSM161.3: LS-M 127/4127 - Manual (Page 10)

SECTION TSM 161.3 ISSUE D PAGE 10 OF 12
fIgURE 9
Size LS
PRESSURE RELIEf VALVE
INSTRUCTIONS
LIST Of PARTS
1. Valve Cap 6. Valve Body
2. Adjusting Screw 7. Valve Spring
3. Lock Nut 8. Poppet
4. Spring Guide 9. Cap Gasket
5. Bonnet 10. Bonnet Gasket
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.
INSTALLATION Of CARBON
gRAPHITE BUSHINgS
TOTAL END CLEARANCE CHART
PUMP
SIZE
TURN OUTER END CAP
COUNTER-CLOCKWISE
NO. Of NOTCHES
TOTAL
END
CLEARANCE
LS 2.5 0.010
Q, QS AND M 5 0.010
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 a reference mark on bracket end, opposite a
notch on outer end cap. Back off outer end cap required
number of notches as shown in Total End Clearance
Chart. Refer to figure 8. Each notch represents .002”
end clearance.
5. High viscosity liquids require additional end clearances.
The amount of extra end clearance depends on
the viscosity of the liquid pumped. For specific
recommendations contact 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 set screws 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 clearance.
THRUST BEARINg ADJUSTMENT
Refer to figure 7.
fIgURE 10
Sizes Q, QS and M
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 750 °F.
2. Install cool bushings with a press.
3. If facilities are not available to reach 750 °F. temperature,
it is possible to install with 450 °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.
fIgURE 8