Viking Pump TSM630.2: LS-QS Universal Seal - Manual (Page 6)

SECTION TSM 630.2 ISSUE I PAGE 6 OF 12
This manual deals with the three standard types of mechanical
seals supplied on Universal Bracket models 4124A, 4126A,
4123A, 4127A, 4224A, 4224AH, 4226A, 4223A, 4227A.
1. Cartridge
(Figure 7, page 7)
2. Elastomeric Bellows (Figure 9, page 7)
3. PTFE Wedge (Figure 10, page 7)
Identification of seal type is an important step towards proper
maintenance. For mechanical seal types not shown, see the
Seal Instruction Drawing (SID) furnished with the pump or
contact a Viking representative.
DANGER !
Before starting pump, be sure all drive
equipment guards are in place.
Failure to properly mount guards may
result in serious injury or death.
MECHANICAL SEAL REPLACEMENT
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.
SEAL REMOVAL
Cartridge mechanical seals are designed so that they may
be replaced with minimal pump and piping disassembly. The
seal may be accessed by removing the bearing housing.
(See Disassembly, Steps 3-5, page 4).
1. Remove any flush or barrier fluid tubes connected to the
seal gland.
2. Loosen setscrews on the seal collar to free the cartridge
seal from the shaft.
3. Remove the two gland capscrews and slide the cartridge
seal out through the bearing housing opening.
If the pump is to be disassembled further, refer to
Disassembly, page 4.
CARTRIDGE TYPE
“Q” and “QS” PUMPS ONLY: Tapered roller bearings
require preload to operate properly. To set preload
tighten end cap so that inner races of bearings cannot
be rotated by hand. Back the end cap off to allow inner
races to rotate with slight resistance.
Lock end cap in place with two setscrews in the flange of
the bearing housing.
8. When assembling pack pump, use packing suitable for
liquid being pumped. Install packing, staggering the
joints from on side of shaft to other. Lubricate packing
rings with oil, grease, or graphite to aid assembly. Install
packing, capscrews, and nuts. Make sure gland is
installed square and nuts are tightened evenly. Tighten
nuts until packing gland is snug against packing.
NOTE: See Seal Installation, page 7 when re-
assembling a seal pump.
9. Slide inner spacer collar over shaft with recessed end
facing rotor. “Q” and “QS” bearing spacer collars are not
recessed.
Place pair of half round rings on shaft and slide inner
bearing spacer collar over half round rings to lock them
in place. There is no pair of half round rings on “Q” and
“QS” size pumps.
10. Thread the bearing housing with lipseals; end cap,
outer bearing spacer collar and bearings installed into
bracket.
11. Put lockwasher and locknut on shaft. Insert length of
hardwood or brass through port opening between rotor
teeth to keep shaft from turning. Tighten locknut to 120-
150 - ft.lbs. torque (LS) or 170-190 - ft.lbs. torque (Q,QS)
. If tang does not line up with slot, tighten locknut until it
does. Failure to tighten locknut or engage lockwasher
tang could result in early bearing failure and cause
damage to rest of pump. Remove length of hardwood or
brass from port opening.
12. Adjust pump end clearance as in Thrust Bearing
Adjustment page 8.
13. Lubricate all grease fittings with multi-purpose grease,
NLGI #2.