Mechanical seal replacement, Seal removal, Cartridge type – Viking Pump TSM630.2: LS-QS Universal Seal User Manual

Page 6

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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.

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