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.
Remove idler and bushing assembly.
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
Tap shaft forward approximately 1/2 inch and remove
pair of half round rings under inner spacer collar.
There is no pair of half round rigs on H and HL size
Carefully remove rotor and shaft to avoid damaging
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 seal seat (see
Figure 6). To remove mechanical seal loosen set
screws holding rotary member on the shaft. Remove
rotary member from shaft and stationary seal seat
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 TSM142.1.
Information is available by contacting the factory.
When requesting special seal information, be sure to
give pump model number and serial number.
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.
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.)
Clean all parts thoroughly and examine for wear or
damage. Check lip seals, ball bearing, bushing and
idler pin and replace if necessary. Check all other
parts for nicks, burrs, excessive wear and replace if
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 nondetergent 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
Scratches on shaft in seal area will provide leakage
paths under mechanical seal.
Casing can be checked for wear or damage while
mounted on bracket.