Viking Pump TSM141.1: G-LL 125/4125 - Manual (Page 5)

SECTION TSM 141.1 ISSUE E PAGE 5 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 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 from the idler pin.
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 the 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. There is no lockwasher on G size pumps.
4. Remove the packing gland nuts.
5. Tap the shaft forward approximately 0.5 inch and remove
the pair of half round rings under the inner bearing spacer
collar. There is no pair of half round rings on G, 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.
ASSEMBLY
1. Install the bracket and/or idler bushing. If the bracket
bushing has a lubrication groove, install the bushing
with the groove at 12:00 o’clock position in bracket. If
replacing 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 in the casing.
8. Loosen the setscrews. Two on G, H and HL size pumps,
four on all other sizes. With a spanner wrench, remove
both end caps with lip seals. Remove the ball bearing
and spacer collars. Refer to Figure 6.
9. Remove the packing and packing retainer washer.
10.
Clean all parts thoroughly and examine for wear and
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 for roughness. Roughness can be
determined by turning the outer race by hand.
11. Casing can be checked for wear or damage while
mounted on the bracket.
6. Carefully remove the rotor and shaft to avoid damaging
the bracket bushing.
7. Remove the packing gland from the side of the bracket.
gREASE FITTINg
SETSCREWS
OUTER END CAP
LOCKWASHER
LOCKNUT
OUTER
SPACER
COLLAR
OUTER LIP
SEAL
BRACKET BALL BEARINg
INNER
LIP SEAL
INNER SPACER
COLLAR
HALF
ROUND
RINgS
INNER
END CAP
NYLON INSERT
FIgURE 6