Viking Pump TSM151.2: LS-M 123/4123 - Manual (Page 9)

SECTION TSM 151.2 ISSUE B PAGE 9 OF 14
FIGURE 5 – STANDARD MECHANICAL SEAL
FIGURE 6
ASSEMBLY
Standard Mechanical Seal
(Synthetic Rubber Bellows Type)
The seal used in this pump is simple to install and good
performance will result if care is taken during installation.
The principle of the mechanical seal is contact between the
rotary and stationary members. These parts are lapped to a
high finish and their sealing effectiveness depends on
complete contact.
A number of heavy-duty pumps are furnished with special
mechanical seals. These special seals are not discussed in
TSM 151.2. Information is available by contacting the
factory. When requesting special seal information, be sure
to give pump model number and serial number.
1. Install bracket bushing. If bracket bushing has a
lubrication groove, install bushing with groove at 6:00
o’clock position in bracket. If carbon graphite, refer to
INSTALLATION OF CARBON GRAPHITE BUSHINGS,
page 12.
2. Coat rotor shaft with non-detergent SAE 30 weight oil.
Start end of shaft in bracket bushing and turn from right
to left, slowly pushing until the ends of the rotor teeth
are just below the face of the casing.
3. Using a .015 inch head gasket, install head and idler
assembly on pump. Pump head and casing were
marked before disassembly to insure proper
reassembly. If not, be sure idler pin, which is offset in
pump head, is positioned toward and equal distance
between port connections to allow for proper flow of
liquid through pump.
If pump is equipped with jacketed head plate, install at
this time along with new gasket.
Tighten head capscrews gently.
If pump is equipped with a relief valve and it was
removed during disassembly, install on head with new
gaskets. Relief valve adjusting screw cap must always
point toward suction port. Refer to Figures 1 and 2 on
page 1. For relief valve repair or adjustments, refer to
PRESSURE RELIEF VALVE INSTRUCTIONS, page
13.
4. Clean rotor shaft and bracket seal housing bore. Be
sure they are free of dirt, grit and scratches. Gently
radius leading edge of shaft diameter over which seal
must be placed.
5. Install seal set collar. Examine set collar for burrs or
scratches, and setscrews are withdrawn to prevent shaft
from being scratched when set collar is installed. Place
set collar onto shaft, push into seal chamber until
centerline of setscrews coincides with centerline of
tapped seal access holes on right side of bracket
(viewed from shaft end). Tighten all setscrews securely
to shaft. Refer to Figure 7.
SET COLLAR
SEAL
SEAT
SPRING ADAPTER
SEAL ACCESS HOLE (FOR SETSCREWS)
MECHANICAL SEAL (ROTARY MEMBER)
SEAL SEAT GASKET
SEAL HOLDER
SEAL HOLDER
PLATE
RIGHT SIDE
OF PUMP
GREASE FITTING LOCATION
SETSCREWS
OUTER END CAP
LOCKWASHER
LOCKNUT
BRACKET
OUTER LIP SEAL
OUTER SPACER
COLLAR
SHAFT
INNER SPACE
COLLAR
HALF ROUND
RINGS
INNER
END CAP
NYLON INSERT
INNER LIP
SEAL
BALL BEARING