Viking Pump TSM442: GG-AL 4195-G LP-Gas - Manual (Page 5)

SECTION TSM 442 ISSUE C PAGE 5 OF 10
DISaSSEMbLY
DaNgER !
before disassembling a pump or
removing it from the line, be sure the
pump and system are free of LP-gas. as
an extra precaution, protective clothing
for face and body should be used when
doing this work.
DaNgER !
avoid tilting the inside of the head
downward, as the idler may slide off the
idler pin.
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.
1. Remove the head capscrews
2. Remove the head and O-Ring gasket
3. Remove idler from idler pin If the idler pin is worn
the head, idler pin and the idler bushing should be
replaced
If the idler bushing is worn, it is strongly recommended
that the idler and bushing be replaced This bushing
can be replaced in the field, but is very difficult It is
a brittle material, and extreme care should be taken
to prevent breaking when it is being installed in the
idler If it is cracked in the idler, this bushing will quickly
disintegrate A hydraulic press should be used to install
carbon graphite bushings Be sure the bushing is
started straight DO NOT STOP the pressing operation
until the bushing is in the proper position
4. Remove the locknut from the shaft A piece of brass
rod or hardwood inserted in the port opening will hold
the shaft from turning
5. The rotor and shaft can now be removed from
the casing The spring and rotary member of the
mechanical seal will come out with the shaft
NOTE: On the HJ and HL size pumps the bearing housing
and double row ball bearing must be removed before the
snap ring in the shaft can be removed
The rotor and shaft cannot be removed until the snap ring is
removed from the shaft
6. Loosen the two (2) setscrews in the end of the bearing
housing, turn the bearing housing counter clockwise
and remove from the casing Remove the snap
ring from the bearing housing on GG, HJ and HL
size pumps and the double row ball bearing can be
removed On the AS, AK, and AL size pumps you must
loosen the setscrews in the outer ring of the bearing
housing and remove the bearing housing end cap,
closure and bearing collar Use a spanner wrench to
remove the end cap
Wash the bearing thoroughly and examine If there is
any evidence of wear or damage, a new bearing should
be used
7. Remove the snap ring and casing ball bearing in the
GG, HJ and HL size pumps Remove the bearing
spacer and casing ball bearing in the AS, AK and AL
size pumps The bearing retainer washer, located
between the casing bearing and seal seat, can now be
removed if it did not stay on the rotor shaft when the
shaft was removed
8. The seal seat or stationary part of the seal can now be
removed from the casing
9. The casing should be examined for wear, particularly at
the seal area between the port openings
All parts should be checked for wear before the pump
is put together When making major repairs, such as
replacing a rotor and shaft, it is usually advisable to
also install a new head and idler