Viking Pump TSM143: N-P 335/4335 - Manual (Page 12)

SECTION TSM 143 ISSUE E PAGE 12 OF 15
DANGER !
before starting the pump, be sure all drive
equipment guards are in place.
failure to properly mount guards may result in
serious injury or death
OPTIONAl MEChANICAl SEAl
(PTfE fitted Type)
Three components are furnished in the mechanical seal
assembly: Refer to Fgure 18, item numbers 1 thru 6.
1. The rotating assembly in which a retainer cartridge
encloses a spring loaded PTFE shaft ring and polished
rotating face. Set screws located around the outside of
the retainer cartridge are provided for securing rotating
assembly to pump shaft.
2. The stationary seal seat.
3. Two seal seat gaskets.
Three pump parts necessary for mounting PTFE mechanical
seal are illustrated in Figure 18, item letters A, B, C and D.
1. The packing box extension, has a machine pilot on the
end for installation in the rotor bearing sleeve and two
tapped holes for the seal flush.
2. The packing box extension gasket.
3. The seal plate is mthe achined to accept seal seat and
gasket.
fIGURE 18
PTFE Fitted Mechanical Seal Assembly
For Models N-R4333, 4335 & 4337
1.
Retainer Cartridge
2. Springs
3. PTFE Shaft Ring (wedge)
4. Rotating Face (washer)
5. Stationary Seal Seat
6. Seat Gaskets
Seal Mounting Parts
A.
Packing box extension
B. Packing box extension gasket
C. Seal plate
D. Flush openings
DISASSEMbly
1. Disassemble the pump per steps 1 thru 10 on page 8
under MEChANICAl SEAl DISASSEMbly.
2. Remove the seal plate nuts from the studs and remove
the seal plate, gaskets and stationary seat.
3. If the pump is equipped with a flush line, disconnect
from the packing box extension.
4. Remove the packing box extension and gasket.
5. Loosen the set screws in the mechanical seal retainer
cartridge and remove from the rotor shaft. Refer to
Figure 18.
ASSEMbly
1. Reassemble the pump per steps 1 thru 9 on pages 10
& 11, under ASSEMbly, STANDARD MEChANICAl
SEAl. Step 1 (deburring shaft) is very critical prior to
the seal assembly.
NOTE: The tapered installation sleeve is available from
factory, at additional cost, for the N & R size pumps.from
Viking Pump Division.
2. Coat the large diameter of shaft, tapered sleeve, and
inside diameter of seal with non-detergent SAE 30
weight oil.
fIGURE 17