Viking Pump TSM312: G-N 32/432 - Manual (Page 7)

SECTION TSM 312 ISSUE G PAGE 7 OF 11
DISaSSEMBLY
DaNgER !
Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
relief valve adjusting cap fitting, etc.)
Be sure:
1. That any pressure in the chamber has
been completely vented through the
suction or discharge lines or other
appropriate openings or connections.
2. That the driving means (motor,
turbine, engine, etc.) has been “locked
out” or made non-operational so that
it cannot be started while work is
being done on pump.
3. That you know what liquid the
pump has been handling and the
precautions necessary to safely
handle the liquid. Obtain a material
safety data sheet (MSDS) for the
liquid to be sure these precautions
are understood.
Failure to follow above listed
precautionary measures may result in
serious injury or death.
aSSEMBLY
1. Refer to figures 5 through 12 for name of parts.
2. Mark head and casing before disassembly to insure
proper reassembly. The idler pin, which is offset in pump
head, must be positioned toward and equal distance
between port connections to allow for proper flow of
liquid through pump.
3. Remove the head capscrews.
NOTE: The four valve capscrews, valve and gasket
must be removed from the G models before the six head
capscrews are removed.
4. Do not allow idler to fall from idler pin. Tilt top of head
back when removing to prevent this. Remove head from
pump. Avoid damaging head gasket set, all gaskets are
required to maintain end clearance.
5. Remove idler and bushing assembly. If idler bushing
needs replacing, refer to INSTaLLaTION OF CaRBON
gRaPHITE BUSHINgS, page 8.
Remove the packing gland, packing and packing retainer
washer.
If you have a mechanical seal pump, remove the end
cap and the mechanical seal is exposed. For K and L
432, consult factory.
Remove the mechanical seal by sliding off the end of
the shaft. Loosen the setscrew in the set collar and
remove it.
1. Install bushing into casing or rotor bearing sleeve. If
bushing has a lubrication groove, install bushing with
groove at 12:00 o’clock position in bracket. If carbon
graphite, refer to INSTaLLaTION OF CaRBON
gRaPHITE BUSHINgS, page 8.
2. Thrust washers used in Q, M and N size pumps should
be assembled on the rotor hub and rotor bearing sleeve.
Put the plain washer on the two locating pins on the rotor
hub. Put the grooved face washer on the pins on the
rotor bearing sleeve with the grooved face toward the
rotor.
3. Coat shaft of rotor shaft assembly with non-detergent
SAE 30 weight oil. Start end of shaft in bracket bushing
turning from right to left, slowly pushing rotor into
casing.
4. Place the head gaskets on the head. The proper amount
of gaskets should be used to provide the necessary
end clearance within the pump so it turns freely with
no appreciable end play. The Gasket Table (Figure 13)
gives the normal amount of gaskets used on each pump.
5. Coat idler pin with non-detergent SAE 30 weight oil and
place idler and bushing on idler pin in head. If replacing
carbon graphite bushing, refer to INSTaLLaTION OF
CaRBON gRaPHITE BUSHINgS, page 8.
6. The head can now be assembled on the pump. Tilt the
top of the head away from the pump slightly until the
crescent enters the inside diameter of the rotor and rotate
the idler until its teeth mesh with the rotor teeth. Do not
damage the head gaskets. Tighten the head capscrews
or nuts and then check the end clearance. If the pump
shaft cannot be rotated, more gaskets must be added. If,
however, the pump has any noticeable end play, remove
enough gaskets so the pump has no appreciable end
play but still turns freely.
CAUTION: Older pumps may have snap ring on shaft-
remove the snap ring before removing rotor and shaft.
Carefully remove the rotor and shaft from the pump to avoid
damaging the casing or rotor bearing sleeve bushing.
THRUST WASHERS: Rotor thrust washer and rotor bearing
sleeve thrust washer used in Q, M and N size pumps should
be removed, examined for excessive wear and replaced if
necessary. These thrust washers are located on the hub of
the rotor and the casing end of rotor bearing sleeve.
If it is necessary to replace the bushing in the casing, rotor
bearing sleeve or idler and/or repack the pump, remove the
old packing and lantern ring and packing retainer washer. G-
LQ pumps don’t have a lantern ring.
Clean all parts thoroughly and examine for wear and/or
damage. Check bushings, and idler pin and replace if
necessary. Check all other parts for nicks, burrs, excessive
wear and replace if necessary.