Viking Pump TSM142.1: H-LL 225/4225 - Manual (Page 11)

SECTION TSM 142.1 ISSUE F PAGE 11 OF 13
AT THIS POINT, fINISH ASSEMBLY PROCEDURES
STARTINg AT STEP 10, PAgE 9.
fIgURE 11
ASSEMBLY
Optional Mechanical Seal
(Synthetic Rubber Bellows Type)
Synthetic rubber bellows mechanical seals, the style shown
in figures 11, 12, 13, may be installed as alternate to the
standard PTFE seal as the application warrants. These seals
are dependent upon friction to drive them and, therefore,
there are no setscrews to tighten. No spacer is used on
Model “K” between rotor and synthetic rubber bellows seal.
Prior to installing rotating portion of mechanical seal, prepare
and organize rotor shaft, head and idler assemblies and
appropriate gaskets for quick assembly.
Once rotating portion of mechanical seal is installed on
rotor shaft, it is necessary to assemble parts as quickly as
possible to insure that seal does not stick to shaft in wrong
axial position. The seal should be expected to stick to the
shaft after several minutes setting time.
Never touch sealing faces with anything except clean hands
or clean cloth. Minute particles can scratch the seal faces
and cause leakage.
1. Clean rotor hub and bracket seal housing bore. Make
sure both are free from dirt and grit. Coat outer diameter
of seal seat and inner diameter of seal housing bore with
non-detergent SAE 30 weight oil.
2. Start seal seat in seal housing bore, refer to figure
11. If force is necessary, protect seal face with a clean
cardboard disc and gently tap it in place with a piece of
wood.
3. Place tapered installation sleeve on shaft, refer to
figure 12. Sleeve is furnished with H, HL, K, KK, L, LQ
and LL size replacement mechanical seals. Coat rotor
shaft, tapered installation sleeve and inner diameter of
mechanical seal rotary member with a generous amount
of non-detergent SAE 30 weight oil. Petrolatum may be
used but grease is not recommended.
4. Place seal spring on shaft against rotor hub. Refer to
figure 13.
5. Slide rotary member, lapped contact surface facing
away from spring, over installation sleeve on shaft until it
is against spring.
Do not compress spring.
6. 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.
Leave the rotor in this position. Withdrawal of rotor and
shaft may displace the carbon seal rotating face and
result in damage to the seal.
fIgURE 12
TAPERED INSTALLATION SLEEVE
SHAfT
MECHANICAL SEAL
ROTARY MEMBER
fIgURE 13
MECHANICAL SEAL
ROTARY MEMBER
SPRINg
SHAfT
ROTOR HUB
BRACKET
BUSHINg
LIP SEAL fOR
SEAL CHAMBER
BRACKET
BRACKET BUSHINg
LUBRICATION gROOVE
IN 6:00 O’CLOCK POSITION
SEAL SEAT
SEAL HOUSINg
BORE
COAT SEAL SEAT AND SEAL HOUSINg BORE
WITH NON-DETERgENT SAE 30 WEIgHT OIL
BEfORE ASSEMBLY.