Viking Pump TSM154: GG-AL 493/4193 - Manual (Page 6)

SECTION TSM 154 ISSUE D PAGE 6 OF 10
11. The rotor and shaft assembly can now be removed by
tapping on the end of the shaft with a lead hammer or,
if using a regular hammer, use a piece of hardwood
between the shaft and hammer. The spring and rotary
member of the seal will come out with rotor and shaft.
12. Remove the inner snap ring and single row ball bearing
from the casing. See figure 9. The AS, AK & AL size
pumps do not have this snap ring.
13. Remove the bearing retainer washer from the AS, AK or
AL size pumps. See figure 10.
14. Remove the seal seat or stationary part of seal from
casing.
15. Disassemble thrust bearing assembly. Remove outer
snap ring from bearing housing for GG, HJ or HL size
pumps and ball bearing can be removed. See figure 9.
16. The AS, AK and AL thrust bearing assembly has an end
cap and lip seal that can be removed after loosening two
set screws in flange of bearing housing. Remove ball
bearing. See figure 10.
SHAfT SNAP RINg
bALL bEARINg
bEARINg HOUSINg
INNER
SNAP RINg
INNER bALL bEARINg
SETSCREW
SHAfT
OUTER SNAP RINg
LOCKNUT
bEARINg
RETAINER WASHER
bEARINg SPACER
SETSCREW
LOCKNUT
LIP SEAL
END CAP
NYLON INSERT
SHAfT
INNER
bALL bEARINg
bEARINg HOUSINg
SETSCREW
bALL bEARINg
fIgURE 9
THRUST bEARINg ASSEMbLY gg, HJ AND HL SIZES
fIgURE 10
THRUST bEARINg ASSEMbLY AS, AK AND AL SIZES
READ CAREFULLY BEFORE REASSEMBLING PUMP
The seal used in this pump simple to install and good
performance will result if care is taken during installation.
The principle of 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.
Prior to installing rotating portion of mechanical seal, prepare
rotor and shaft assembly, head and idler assemblies and
appropriate gaskets for quick assembly.
Once rotating portion of mechanical seal is installed on rotor
and shaft assembly, it is necessary to assemble parts as
quickly as possible to ensure the 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. Coat idler pin with non-detergent SAE 30 weight oil and
place idler and bushing in idler pin on head. If replacing a
carbon graphite bushing, refer to installation of Carbon
graphite bushings, page 7.
2. Clean rotor, hub and casing 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.
3. Start seal seat in seal housing bore. If force is necessary,
protect seal face with a clean cardboard disc and gently
tap it in place with a hammer using a piece of wood.
The casing should be examined for wear, particularly in the
area between ports. All parts should be checked for wear
before pump is put together.
When making major repairs, such as replacing a rotor and
shaft; it is advisable to also install a new mechanical seal,
head and idler pin, idler and bushing. See “Installation of
Carbon graphite bushings” page 7.
Clean all parts thoroughly and examine for wear or damage.
Check lip seals, ball bearings, bushing and idler pin and
replace if necessary. Check all other parts for nicks, burrs,
excessive wear and replace if necessary.
Wash the bearings in clean solvent. Blow out the bearings
with compressed air. Do not allow the bearings to spin; turn
them slowly by hand. Spinning the bearings will damage
the race and balls. Make sure the bearings are clean, then
lubricate with non-detergent SAE 30 weight oil and check
for roughness. Roughness can be determined by turning
the outer race by hand. Replace the bearings if they have
roughness.
Be sure the shaft is free from nicks, burrs and foreign
particles that might damage the mechanical seal. Scratches
on the shaft in the seal area will provide leakage paths under
the mechanical seal. Use a fine emery cloth to remove
scratches or sharp edges.
ASSEMbLY
Standard Mechanical Seal
(Synthetic Rubber bellows Type)