Viking Pump TSM141.1: G-LL 125/4125 - Manual (Page 12)

SECTION TSM 141.1 ISSUE E PAGE 12 OF 16
1. Mark the head position relative to the casing before
disassembly to ensure proper reassembly. The idler pin,
which is offset in the pump head, must be positioned
toward and equal distance between the port connections
to allow for proper flow of liquid through the pump.
Tilt the top of the head back when removing the head
to prevent the idler from falling. Remove the head from
the pump. Avoid damaging the head gasket. If the pump
is furnished with a pressure relief valve, it need not be
removed from the head or disassembled at this point.
Refer to Pressure Relief Valve Instructions, page 15.
If the pump has a jacketed head plate, it will separate
from the head when it is removed. The gasket between
the head and jacket head plate must be totally removed.
Always use a new gasket when assembling the pump.
2. Remove the idler and bushing assembly.
3. Insert a length of hardwood or brass through the port
opening between the rotor teeth to keep the shaft from
turning. Bend up the tang of the lockwasher and with
a spanner wrench remove the locknut and lockwasher
from the shaft.
4. Rotate the shaft so that the two setscrews for the set
collar can be seen through the seal access hole on the
left side of the pump (viewed from the shaft end). These
two setscrews must be loosened before the shaft can
be removed from the pump. Refer to Figure 15, page 13.
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.
The seal used in this pump is simple to install and good
performance will result if care is taken during installation.
The principle of the 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.
1. Install
the bracket bushing. If the bracket bushing has
a lubrication groove, install the bushing with the groove
at the 12:00 o’clock position in the bracket. If carbon
graphite, Refer to Installation of Carbon graphite
Bushings, page 14.
2. Coat the shaft of the rotor shaft assembly with non-
detergent SAE 30 weight oil. Start the end of the shaft
in the bracket bushing turning from right to left, slowly
pushing the rotor into the casing.
3. Coat the idler pin with non-detergent SAE 30 weight oil
and place the idler and bushing on the idler pin in the
head. If replacing carbon graphite bushing, Refer to
Installation of Carbon graphite Bushings, page 14.
ASSEMBLY
Standard Mechanical Seal
(Synthetic Rubber Bellows Type)
Sizes AK and AL
5. Remove the seal holder nuts, seal holder plate and the
capscrews.
6. Seal holder cannot be removed until the shaft is
removed.
7. Tap the shaft forward approximately 0.5 inch and remove
the pair of half round rings under the inner spacer collar.
8. Carefully remove the rotor and shaft to avoid damaging
the bracket bushing.
9. Remove the seal holder, seal seat and rotary member of
the seal from the side opening in the bracket.
10. Loosen the four setscrews over the outer and inner end
caps. With a spanner wrench remove both end caps and
lip seals. Remove the ball bearing and spacer collars.
Refer to Figure 6, page 5.
11. Clean all parts thoroughly and examine for wear or
damage. Check the lip seals, ball bearing, bushings
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 roughness. Roughness may be
determined by turning the outer race by hand.
Be sure the shaft is free from nicks, burrs and foreign
particles that might damage the bracket bushing.
Scratches on the shaft in the seal area will provide
leakage paths under the mechanical seal.
12. Casing can be checked for wear or damage while
mounted on the bracket.