Viking Pump TSM142.1: H-LL 225/4225 - Manual (Page 8)

SECTION TSM 142.1 ISSUE F PAGE 8 OF 13
1. Mark head and casing before disassembly to insure
proper reassembly. The idler pin, which is offset in pump
head, must be positioned toward and equal distance
between port connections to allow for proper flow of
liquid through pump.
Remove head from pump.
Do not allow idler to fall
from idler pin. Tilt top of head back when removing
to prevent this. Avoid damaging head gasket. If pump
is furnished with pressure relief valve, it need not be
removed from head or disassembled at this point. Refer
to Pressure Relief Valve Instructions, page 11.
If pump has jacketed head plate, it will separate from
head when it is removed. The gasket between head and
jacket head plate must be totally removed. Use new
gasket when assembling pump.
2. Remove idler and bushing assembly.
3. Insert length of hardwood or brass through port opening
between rotor teeth to keep shaft from turning. Bend up
tang of lockwasher and with a spanner wrench remove
locknut and lockwasher from shaft.
4. Tap shaft forward approximately 0.5 inch and remove
pair of half round rings under inner spacer collar. There
is no pair of half round rings on H and HL size pumps.
DISASSEMBLY
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.
5. Carefully remove rotor and shaft to avoid damaging
bracket bushing.
6. Mechanical Seal (Type 9): If the mechanical seal in your
pump ever fails, it can easily be replaced with a new
seal. There are two basic parts to this seal. They are
the rotary member and the seal seat (See Figure 6). To
remove the mechanical seal loosen set screws holding
rotary member on the shaft. Remove rotary member
from shaft and stationary seal seat from bracket. Viking
furnishes a number of heavy-duty pumps with special
mechanical seals installed in the packing end of the
pump. These special seals are not discussed in TSM
142.1. Information is available by contacting the factory.
When requesting special seal information, be sure to
give pump model number and serial number.
7. Loosen setscrews. Two for H and HL size pumps, four
for all other sizes. With spanner wrench remove both
end caps and lip seals. Remove ball bearing and spacer
collars. Refer to figure 5, page 4.
8. Examine seal chamber lip seal and remove if it shows
wear or damage. Lip seal must be removed if bracket
bushing needs to be replaced. (Cataloged pump has a
Viton lip seal).
9. Clean all parts thoroughly and examine for wear or
damage. Check lipseals, ball bearing, bushing and idler
pin and replace if necessary. Check all other parts for
nicks, burrs, excessive wear and replace if necessary.
Wash bearings in clean solvent. Blow out bearings with
compressed air. Do not allow bearings to spin; turn them
slowly by hand. Spinning bearings will damage race
and balls. Make sure bearings are clean, then lubricate
with non-detergent SAE 30 weight oil and check for
roughness. Roughness can be determined by turning
outer race by hand.
Be sure shaft is free from nicks, burrs and foreign
particles that might damage bracket bushing. Scratches
on shaft in seal area will provide leakage paths under
mechanical seal.
10. Casing can be checked for wear or damage while
mounted on bracket.