Viking Pump TSM320.1: C-FH 56/456 - Manual (Page 5)

SECTION TSM 320.1 ISSUE E PAGE 5 OF 7
The casing bushing can be replaced in the following manner:
Insert a bar approximately 0.94” diameter and at least 3.5”
long in the packing or seal end of the casing and press the
bushing out of the casing.
When installing a new carbon graphite bushing, extreme
care should be taken to prevent breakage as carbon graphite
is a brittle material and easily cracked. When cracked the
bushing may quickly disintegrate in operation. An arbor press
should always be used and the bushing should be installed in
one even uninterrupted stroke of the press. Dip the bushing
in lube oil and start the bushing in the head end of the casing.
Press until located to the “A” dimension in figure 6.
INSTaLLINg CaSINg BUShINg
fIgURE 5
fIgURE 6
The end clearance within the pump is governed by the location
of the casing bushing as well as the number of head gaskets.
To correctly position the casing bushing in the casing, see
note in step 3 of aSSEMBLY.
PUMP SIZE “a” DIMENSION
C 0.88” to 0.94”
F & FH 1.19” to 1.25”
1. Clean all parts thoroughly.
2. Place the rotor and shaft in the casing.
3. Put the head gaskets on the head and the idler on the
idler pin projecting from the head. Replace the head in
the casing; tighten cap screws.
NOTE: If a new casing bushing has been installed in the
casing, use only one .002” head gasket on the head and
tighten the capscrews evenly and securely. This will correctly
position the bushing in the casing. Remove the head, add
one .002” head gasket and replace the capscrews and tighten
securely.
NOTE: Turn the shaft by hand to be certain it turns freely.
4. When reassembling a mechanically sealed pump, place
the spring washer and spring on the shaft, see figure 5,
Page 4. Coat the shaft and the inside of the rubber
bellows of the seal rotary member with light oil. Slide the
rotary member part way down the shaft.
NOTE: The lapped face of the carbon wear ring must face
toward the shaft end of the pump. Be sure the notches on the
edge of the carbon wear ring mate with the retainer lugs in
the rotary member.
Oil the lapped faces of the rotary member and the seal seat.
Slide the seal seat on the shaft until it contacts the rotary
member and then push the complete seal into the casing.
Replace the packing nut and tighten.
Your pump is now completely assembled. Once again turn
the pump shaft by hand to be sure it turns freely. Start the
pump with a supply of liquid in the suction line, since the
pump should not be run dry.
5. If the pump has packing rather than a mechanical seal,
place the spring and inner packing gland on the shaft and
slide into the pump. Next install the packing. Stagger the
joints in the packing a half turn and add lube oil between
each ring of packing. Push the outer packing gland in the
casing, and replace the packing nut and tighten.
aSSEMBLY
SPRINg
PaCKINg NUT
CaRBON WEaR RINg
SPRINg WaShER
RETaINER LUg
ROTaRY
MEMBER
SEaL SEaT
hEaD
faCE
A